Page 1 Service Guide Agilent Technologies 8564EC and 8565EC Spectrum Analyzers 08564-900xx Manufacturing Part Number: Printed in USA January 2010 Supersedes: December 1999 © Copyright 1995 − 2001 Agilent Technologies, Inc.
Page 2: General Safety Considerations
Notice Agilent Technologies makes no warranty of any kind with regard to this material, including but not limited to, the implied warranties of merchantability and ﬁtness for a particular purpose. Agilent Technologies shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.
Page 3 If this instrument is used in a manner not speciﬁed by Agilent Technologies, the protection provided by the instrument may be impaired. There are many points in the instrument which can, if contacted, cause personal injury.
Page 4 This Agilent Technologies instrument product is warranted against defects in material and workmanship for a period of one year from date of shipment. During the warranty period, Agilent Technologies will, at its option, either repair or replace products that prove to be defective.
Page 5: Table Of Contents
Contents 1. General Information Introduction ..............26 How to Use this Guide .
Page 6 Contents Assembly Adjusted ............69 Related Performance Test .
Page 7 Contents Related Performance Test ........... 99 Description .
Page 8 Contents Related Performance Tests ..........130 Description .
Page 9 Removal/Replacement ........... . . 179 Procedure 2A. A1 Front Frame/A18 LCD (8564EC and 8564EC) ....180 Removal of the Front Frame.
Page 10 Replacement .............203 Procedure 6A. A6 Power Supply Assembly (8564EC and 8565EC) ....209 Removal .
Page 11 Contents Procedure 12. BT1 Battery ..........238 Removal/Replacement .
Page 12 Contents Fast ADC Error (760) ............349 Option Module Errors (800 to 899) .
Page 13 Contents Trigger ..............419 16-Bit Post-Trigger Counter .
Page 14 16 MHz Harmonic Filter (8564EC and 8565EC) ........
Page 15 LCD Display (8564EC and 8565EC) ........
Page 16 Contents Dim Display ............. .639 Troubleshooting Using the VGA Port .
Page 17: General Information
General Information...
Page 18: Introduction
General Information Introduction Introduction This 8564EC and 8565EC Spectrum Analyzers Service Guide contains information required to adjust and service the 8564EC and 8565EC to the assembly level. How to Use this Guide ............page 27 Instrument Variations ............page 29 Serial Number and Repair Information......
Page 19: How To Use This Guide
General Information Introduction How to Use this Guide Chapters 1 through 5 contain adjustments and parts information that can be used to adjust your spectrum analyzer and to help you ﬁx problems. Chapter 6, “General Troubleshooting”, can be used to identify the location of a problem to a board or functional area in the spectrum analyzer.
Page 20: Instrument Variations
General Information Instrument Variations Instrument Variations There are options available to the 8564EC and 8565EC. The following table lists these options and identiﬁes the assemblies which are unique to them. Table 1-1 Instrument Variations Option Added Deleted 8564EC and 8565EC...
Page 21: Serial Numbers And Repair Information
Whenever you contact Agilent Technologies about a product, have the complete serial number available to ensure obtaining the most complete and accurate information possible.
Page 22 General Information Serial Numbers and Repair Information Figure 1-2 Earlier Serial Number Label Example It is important that you realize that the new serial number format (US00000000) is always considered "above" the earlier format (0000A00000) when you encounter change information such as ".…serial preﬁx 3425A and above"...
Page 23: Service Kit
General Information Service Kit Service Kit The spectrum analyzer service kit (part number 08562-60021) contains service tools required to repair the instrument. Refer to Table 1-2 for a list of items in the service kit. Table 1-2 Service Kit Contents Description Quantity Part Number...
Page 24: Electrostatic Discharge
General Information Electrostatic Discharge Electrostatic Discharge Electrostatic discharge (ESD) can damage or destroy electronic components. Therefore, all work performed on assemblies consisting of electronic components should be done at a static-free workstation. Figure 1-3 is an example of a static-safe workstation using two kinds of ESD protection: •...
Page 25: Reducing Potential For Esd Damage
General Information Electrostatic Discharge Reducing Potential for ESD Damage The suggestions that follow may help reduce ESD damage that occurs during instrument testing and servicing. • Before connecting any coaxial cable to an spectrum analyzer connector for the ﬁrst time each day, momentarily ground the center and outer connectors of the cable.
Page 26: Returning Instruments For Service
Returning Instruments for Service Returning Instruments for Service Service Tag If you are returning the instrument to Agilent Technologies for servicing, ﬁll in and attach a blue service tag. Service tags are supplied in the back of this chapter. Please be as speciﬁc as possible about the nature of the problem. If you have recorded any error messages that appeared on the screen, or have completed a performance test record, or have any other speciﬁc data on...
Page 27 General Information Returning Instruments for Service 5. Surround the equipment with at least 3 to 4 inches of packing material, or enough to prevent the equipment from moving in the carton. If packing foam is unavailable, the best alternative is SD-240 Air Cap™...
Page 28: Recommended Test Equipment
Model Sources Synthesized Frequency range: 83650A P,A,T, sweeper 8564EC, 10 MHz to 40.0 GHz Option 001, 008 8565EC, 10 MHz to 50.0 GHz −9 Frequency accuracy (CW): 1 × 10 /day Leveling mode: Internal Power level range: −35 to +16 dBm...
Page 29 General Information Recommended Test Equipment Table 1-4 Recommended Test Equipment Instrument Critical Speciﬁcations for Equipment Recommended Substitution Model AM/FM Frequency range: 1 MHz to 200 MHz 8640B signal generator Frequency modulation mode 8642A Modulation oscillator frequency: 1 kHz FM peak deviation: 5 kHz Counters Frequency Output frequency: 10 MHz...
Page 30 Digitizing display with time cursors Delta-t cursor accuracy in 500 ns/Div: <0.1 µs Ampliﬁer Frequency range: 11975 8564EC, 2.0 to 8.0 GHz 8565EC, 2.0 to 8.0 GHz Minimum output power (leveled) 2.0 to 8.0 GHz: +16 dBm Output SWR (leveled): <1.7 Output voltage: ≥24 Vdc...
Page 31 General Information Recommended Test Equipment Table 1-4 Recommended Test Equipment Instrument Critical Speciﬁcations for Equipment Recommended Substitution Model Range: −15 Vdc to +120 Vdc Digital voltmeter 3456A* Accuracy: <±1 mV on 10 V range Input impedance: ≥1 M Ω Probes ≥36 inches, alligator clips, probe tips DVM test leads 34118A...
Page 32 General Information Recommended Test Equipment Table 1-4 Recommended Test Equipment Instrument Critical Speciﬁcations for Equipment Recommended Substitution Model Low-pass ﬁlter Cutoff frequency: 50 MHz 0955-0306 P,M,V Rejection at 65 MHz: >40 dB Rejection at 75 MHz: >60 dB Low-pass ﬁlter Cutoff frequency: 1.8 GHz 0955-0491 Rejection at >3 GHz: >45 dB...
Page 33 General Information Recommended Test Equipment Table 1-4 Recommended Test Equipment Instrument Critical Speciﬁcations for Equipment Recommended Substitution Model Cable Frequency range: 30 Hz to 26.5 GHz 8120-4921 P,A,M,V (two required) Maximum SWR: <1.4 at 26.5 GHz Maximum insertion loss: 3 dB Connectors: APC 3.5 (m), both ends Length: ≥...
Page 34 General Information Recommended Test Equipment Table 1-4 Recommended Test Equipment Instrument Critical Speciﬁcations for Equipment Recommended Substitution Model Adapter APC 3.5 (m)-to-2.4 mm (f) 11901D Adapter Type N (f)-to-2.4 mm (f) 11903B P,A,T,V Adapter Type N (f)-to-2.4 mm (m) 11903C * Part of microwave workstation P = performance tests A = adjustments...
Page 35: Sales And Service Ofﬁces
General Information Sales and Service Ofﬁces Sales and Service Ofﬁces Agilent Technologies has sales and service ofﬁces around the world providing complete support for Agilent Technologies products. To obtain servicing information, or to order replacement parts, contact the nearest Agilent Technologies Sales and Service Ofﬁce listed in...
Page 36 General Information Sales and Service Ofﬁces Table 1-5 Agilent Technologies Sales and Service Ofﬁces UNITED STATES Instrument Support Center Agilent Technologies (800) 403-0801 EUROPEAN FIELD OPERATIONS Headquarters France Germany Agilent Technologies S.A. Agilent Technologies France Agilent Technologies GmbH 150, Route du Nant-d’Avril...
Page 37: Adjustment/Diagnostic Software
Adjustment/Diagnostic Software...
Page 38: Introduction
The 8564E/8565E Adjustment/Diagnostic Software is essential for proper adjustment of an 8564EC or 8565EC spectrum analyzer. Never perform adjustments as routine maintenance. Adjustments should be performed after a repair or performance test failure. For...
Page 39: Safety Considerations
Adjustment/Diagnostic Software Introduction Safety Considerations Although this instrument has been designed in accordance with international safety standards, this manual contains information, cautions, and warnings which must be followed to ensure safe operation and to prevent damage to the instrument. Service and adjustments should be performed only by qualiﬁed service personnel.
Page 40: Which Adjustments Should Be Performed
Adjustment/Diagnostic Software Introduction Which Adjustments Should Be Performed? Table 2-1 on page 51 lists the adjustments that should be performed when an assembly is repaired or changed. It is important to perform the adjustments in the order indicated to ensure that the instrument meets its speciﬁcations.
Page 41: Instrument Service Position
Adjustment/Diagnostic Software Introduction Instrument Service Position Refer to Chapter 4 for information on removing the spectrum analyzer cover assembly and accessing all internal assemblies. Table 2-1 Related Adjustments Assembly Perform the following related Adjustment Number Changed adjustments in the order listed Manual Automated* Repaired...
Page 42 Adjustment/Diagnostic Software Introduction Table 2-1 Related Adjustments Assembly Perform the following related Adjustment Number Changed adjustments in the order listed Manual Automated* Repaired A7 LOMA LOMA adjustments (or perform the frequency response Front end cal performance test in the 8560 E-Series and EC-Series Spectrum Analyzer Calibration Guide.
Page 43 Adjustment/Diagnostic Software Introduction Table 2-1 Related Adjustments Assembly Perform the following related Adjustment Number Changed adjustments in the order listed Manual Automated* Repaired A15 RF 10 MHz reference adjustment (TCXO, Option 103) or CAL OUT adjustment † Calibrator amplitude adjustment or CAL OUT adjustment †...
Page 44: Getting Started
”Equipment Connections” Spectrum Analyzers The 8564E/8565E Adjustment/Diagnostic Software can be used to adjust or troubleshoot ONLY an 8564EC or an 8565EC. Errors will occur if this software is used to test spectrum analyzers other than the 8564EC or 8565EC. Controller (Computer)
Page 45: Test Equipment
Adjustment/Diagnostic Software Getting Started Test Equipment Table 2-2 on page 56 lists the test equipment required to perform the automated adjustments. Test equipment which is not listed here is not compatible with the adjustment/diagnostic software. You do not need all the test equipment connected to perform the adjustments. You need only connect the equipment speciﬁed in each adjustment to run that adjustment.
Page 46 Adjustment/Diagnostic Software Getting Started Spectrum Analyzer Warm-up Warm the spectrum analyzer up for at least 30 minutes before performing the ﬁrst adjustment. Table 2-2 Test Equipment Required for Automated Adjustments Description Model Number Controller* HP 9000 model 236 (HP 9836) or HP 9000 model 310 or HP 9000 model 320 or HP 9000 model 350...
Page 47: Equipment Connections
Adjustment/Diagnostic Software Getting Started Equipment Connections Computer (Controller) Setup For HP 9000 model 236 computers, setup instructions are provided in Chapter 1, "Computer Installation," of the BASIC Operating Manual. For HP 9000 model 310, 320, or 350 computers, setup information is provided in the Conﬁguration Reference Manual for the Series 300 computers.
Page 48: Using The Adjustment/Diagnostic Software
HP BASIC. 2. Create a new directory on your hard disk drive or SRM node. For example, 8564eadj. 3. Download the 8564EC & 8565EC Adjustment/Diagnostics software from www.agilent.com/find/8560_software. 4. Unzip the download file to the directory created in step 2.
Page 49: To Use The Adjustment Program
Adjustment/Diagnostic Software Using the Adjustment/Diagnostic Software .At the prompt "Enter power sensor model #. Example, 8487", enter the ﬁrst 4 digits of the model number of the power sensor for which you are entering calibration data. Do not enter any alpha characters;...
Page 50 Adjustment/Diagnostic Software Using the Adjustment/Diagnostic Software 4. At the prompt ENTER STATION NUMBER WHERE THE ADDRESS WILL BE USED, type , then RETURN ENTER 5. Verify that the default GPIB addresses are the addresses actually set on all of the instruments. If you change any of the GPIB addresses, press RECORD ADR before NOTE continuing.
Page 51 Adjustment/Diagnostic Software Using the Adjustment/Diagnostic Software All but two of the microcircuit entries required (M4 and M5) are NOTE voltages listed on the A7 LOMA. Although the label on A7 lists "Int B4, Int B5, SBTX B4, and SBTX B5", the software requires that you enter only "Int B4"...
Page 52: Automated Adjustments
Adjustment/Diagnostic Software Automated Adjustments Automated Adjustments The following automated adjustments can be performed in any order, EXCEPT number one (1) Initial Information. This initial information routine must ALWAYS be run ﬁrst. Chapter 2...
Page 53: Initial Information
Adjustment/Diagnostic Software 1. Initial Information 1. Initial Information This Initial Information routine must ALWAYS be run ﬁrst. Carefully follow the instructions and prompts that the software program displays. Any of the listed adjustments may be selected next. Chapter 2...
Page 54: Lo Frequency
Adjustment/Diagnostic Software 2. LO Frequency 2. LO Frequency Assembly Adjusted A14 frequency control assembly Related Performance Tests Frequency Readout Accuracy and Frequency Count Marker Accuracy Procedure Figure 2-1 LO Frequency Adjustment Setup 1. Connect the equipment as shown in Figure 2-1 on page 64 carefully follow the instructions issued by the software program.
Page 55 Adjustment/Diagnostic Software 2. LO Frequency Figure 2-2 LO Frequency Adjustment Locations Chapter 2...
Page 56: Yto Fm Coil
Adjustment/Diagnostic Software 3. YTO FM Coil 3. YTO FM Coil Assembly Adjusted A14 frequency control assembly Related Performance Tests Frequency Span Accuracy, Frequency Readout Accuracy, and Frequency Count Marker Accuracy Procedure 1. Connect the CAL OUTPUT to the INPUT 50Ω on the spectrum analyzer being adjusted.
Page 57 Adjustment/Diagnostic Software 3. YTO FM Coil Figure 2-3 YTO FM Coil Adjustment Locations Chapter 2...
Page 58: Loma Adjustments
Adjustment/Diagnostic Software 4. LOMA Adjustments 4. LOMA Adjustments Assembly Adjusted A14 frequency control assembly Related Performance Test 1ST LO OUTPUT Amplitude Procedure When connecting the 8587A power sensor to the 1 ST LO OUTPUT, be CAUTION sure to use proper adapters. Failure to do so will result in damage to the expensive connector of the power sensor.
Page 59: Assembly Adjusted
Adjustment/Diagnostic Software 5. 3rd Amp/2nd IF Align . 3rd Amp/2nd IF Align Assembly Adjusted A15 RF assembly Related Performance Test IF Input Amplitude Accuracy Procedure When connecting the 11667C power splitter, be sure to use proper CAUTION adapters where necessary. Failure to do so will result in damage to the expensive connectors of the power splitter.
Page 60: Assembly Adjusted
Adjustment/Diagnostic Software 6. Cal Out Adjustment . Cal Out Adjustment Assembly Adjusted A15 RF assembly Related Performance Test Calibrator Amplitude and Frequency Accuracy Procedure 1. Connect the 8482A power sensor (through adapter) to the front panel CAL OUTPUT on the spectrum analyzer. 2.
Page 61: Assembly Adjusted
Adjustment/Diagnostic Software 7. Front End Cal . Front End Cal Assembly Adjusted A10/A12 RYTHM/SBTX (tower) A14 frequency control assembly A15 RF assembly Related Performance Tests Displayed Average Noise Level Frequency Response Procedure 1. Carefully follow the instructions issued by the software program. This test requires long waiting periods between adjustments.
Page 62: Procedure
Adjustment/Diagnostic Software 8. IF Bandpass Poles . IF Bandpass Poles Assembly Adjusted A5 IF assembly Related Performance Test Resolution Bandwidth Accuracy and Selectivity Procedure Use special tuning tool, part number 8710-1010. NOTE 1. Carefully follow the instructions issued by the software program. 2.
Page 63: Procedure
Adjustment/Diagnostic Software 9 . IF Amplitude . IF Amplitude Assembly Adjusted A4 log amp/cal oscillator assembly A5 IF assembly Related Performance Tests IF Gain Uncertainty Scale Fidelity Procedure Figure 2-6 IF Amplitude Adjustment Setup 1. Connect equipment as shown in Figure 2-6 on page 75 and carefully follow the instructions issued by the software program.
Page 64: Procedure
Adjustment/Diagnostic Software 10. DC Log Adjustment . DC Log Adjustment Assembly Adjusted A4 log amp/cal oscillator assembly Related Performance Tests IF Gain Uncertainty Scale Fidelity Procedure These adjustments need only be done under the following conditions: NOTE Limiter phase Only if a repair is made to blocks F, G, H, I, or J. Linear ﬁdelity Only if a repair is made to blocks C, D, F, G, H, I, J, K, O, IF gain accuracy, RBW switching, or log ﬁdelity.
Page 65 Adjustment/Diagnostic Software 10 . DC Log Adjustment 1. Connect the 3335A to the INPUT 50Ω of the spectrum analyzer being adjusted. 2. Carefully follow the instructions issued by the software program. Figure 2-8, “DC Log Adjustment Locations,” for adjustment locations. Figure 2-8 DC Log Adjustment Locations Chapter 2...
Page 66: Procedure
Adjustment/Diagnostic Software 11. Sampling Oscillator . Sampling Oscillator Assembly Adjusted A15 RF assembly Related Performance Test There is no related performance test for this adjustment. Procedure 1. Carefully follow the instructions issued by the software program. Chapter 2...
Page 67: Dac Control
Adjustment/Diagnostic Software To Use the Diagnostics To Use the Diagnostics When performing DAC/LATCH Control or Cal Osc Control, freeze the NOTE spectrum analyzer by pressing , EXTERNAL, , then TRIG SGL SWP IF ADJ OFF. (Do not provide a trigger.) When it is necessary to observe the effects of changes on the display, set the spectrum analyzer for a long sweep time (>...
Page 68 Adjustment/Diagnostic Software To Use the Diagnostics 6. Select the PC board that includes the DAC of interest, then select the DAC. 7. Use SELECT to set single values. (The default for entries is decimal, but hexidecimal or binary can entered by appending either an "H" or a "B", respectively.
Page 69 Adjustment/Diagnostic Software To Use the Diagnostics Table 2-3 DAC Control Recommended Instrument State Reference Recommended Instrument Designator State* RF Gain B DAC A3U417B Refer to ”Flatness Control (RF Chapter 8 . Gain DACs)” RT DAC 1 A3U409B State 1 Video Trigger DAC A3U409A State 1 Crystal 1 Center Frequency DAC...
Page 70 Adjustment/Diagnostic Software To Use the Diagnostics Table 2-3 DAC Control Recommended Instrument State Reference Recommended Instrument Designator State* Log Offset Coarse DAC A4U102B State 1 Log Offset Fine DAC A4U102C State 1 Local Oscillator Tune DAC A4U102D State 1 *Refer to steps 1 and 3 of ”DAC Control”...
Page 71: Latch Control
Adjustment/Diagnostic Software To Use the Diagnostics Latch Control Latch control is very similar to the DAC control diagnostics except you can control individual bits. Use state 1 setup (refer to step 1 in ”DAC Control”). Table 2-4 Latch Control Recommended Instrument State Latch Reference Recommended...
Page 72: Cal Oscillator Control
Adjustment/Diagnostic Software To Use the Diagnostics Cal Oscillator Control 1. Using another spectrum analyzer, look at the output of the cal oscillator. Refer to the A4 schematic diagram in the 8560 EC-Series Spectrum Analyzer Component Level Information and 8560 E-Series n.
Page 73: If Diagnostics
Adjustment/Diagnostic Software To Use the Diagnostics IF Diagnostics Be sure power to the 8564EC or 8565EC is turned off before CAUTION connecting the 85629B TAM to the DUT. Failure to do so may cause damage to the DUT or the TAM.
Page 74 Adjustment/Diagnostic Software To Use the Diagnostics 1. Using the 8564E and 8565E adjustment/diagnostic software, select the RF diagnostics. 2. Connect the test board (P/N 08564-69201) between the A14 frequency control assembly and the microcircuits (A7 LOMA and A10/A12 RYTHM/SBTX). The test board is labeled µCKT and INSTR SIDE.
Page 75 Adjustment/Diagnostic Software To Use the Diagnostics Figure 2-10 Diagnostic Software Connection Locations, A14 and A15 Chapter 2...
Page 76 Adjustment/Diagnostic Software To Use the Diagnostics Figure 2-11 Diagnostic Software Connection Locations, RF Section Chapter 2...
Page 77: Manual Adjustment Procedures
3 Manual Adjustment Procedures...
Page 78: Introduction
Manual Adjustment Procedures Introduction Introduction This chapter contains information on manual adjustment procedures. Never perform adjustments as routine maintenance. Adjustments should be performed after a repair or performance test failure. For information on which adjustments to perform, refer to Table 3-1 on page Information on automated adjustments can be found in Chapter 2...
Page 79: Safety Considerations
Manual Adjustment Procedures Introduction Before performing any adjustments, allow the spectrum analyzer to NOTE warm up for at least 5 minutes. Safety Considerations Although this instrument has been designed in accordance with international safety standards, this manual contains information, cautions, and warnings which must be followed to ensure safe operation and to prevent damage to the instrument.
Page 80: Adjustable And Factory-Selected Components
Manual Adjustment Procedures Introduction Adjustable and Factory-Selected Components Table 3-2 on page 96 lists the adjustable components by reference designation and name. For each component, the table provides a description and lists the adjustment number. Refer to Table 3-3 on page 98 for a complete list of factory-selected components used in the instrument along with their functions.
Page 81 Manual Adjustment Procedures Introduction Table 3-1 Related Adjustments Assembly Perform the following related Adjustment Number Changed or adjustments in the order listed Manual Automated* Repaired A1A1 keyboard No related adjustment A1A2 RPG No related adjustment A2 controller If EEROM from old A2 controller could not be used in new A2 or if EEROM must be replaced, also perform the following adjustments:...
Page 82 Manual Adjustment Procedures Introduction Table 3-1 Related Adjustments Assembly Perform the following related Adjustment Number Changed or adjustments in the order listed Manual Automated* Repaired A7 LOMA LOMA adjustments Front end cal (or perform the frequency response performance test in the 8560 E-Series and EC-Series Spectrum The adjustment...
Page 83: Sampling Oscillator
Manual Adjustment Procedures Introduction Table 3-1 Related Adjustments Assembly Perform the following related Adjustment Number Changed or adjustments in the order listed Manual Automated* Repaired A15 RF 10 MHz reference adjustment (TCXO, † Option 103) or CAL OUT adjustment Calibrator amplitude adjustment or CAL †...
Page 84 Manual Adjustment Procedures Introduction Table 3-2 Adjustable Components Reference Adjustment Adjustment Description Designator Name Number A4C707 FM DEMOD Adjusts the FM demodulation for a peak response. A4R445 LIMITER Adjusts Limiter Phase for peak response. PHASE A4R531 LOG AMP Minimizes error to Top of Screen. A4R544 Minimizes Linearity Fidelity error.
Page 85 Manual Adjustment Procedures Introduction Table 3-2 Adjustable Components Reference Adjustment Adjustment Description Designator Name Number A5T200 XTAL CTR 1 Adjusts center frequency of ﬁrst stage of crystal bandwidth ﬁlter to 10.7 MHz. A5T202 XTAL CTR 2 Adjusts center frequency of second stage of crystal bandwidth ﬁlter to 10.7 MHz.
Page 86 Manual Adjustment Procedures Introduction Table 3-3 Factory Selected Components Reference Adjustment Basis of Selection Designator Number A5C204 Selected to optimize center frequency of LC tank that loads the crystal. A5C216 Selected to optimize center frequency of LC tank that loads the crystal. A5C326 Selected to optimize LC pole center frequency.
Page 87: Assembly Adjusted
Manual Adjustment Procedures 1. IF Bandpass Adjustment . IF Bandpass Adjustment Assembly Adjusted A5 IF assembly Related Performance Test Resolution Bandwidth Accuracy and Selectivity Description The center frequency of each IF bandpass ﬁlter pole is adjusted by DAC-controlled varactor diodes and an inductor (for the LC poles) or a transformer (for the crystal poles).
Page 88 Manual Adjustment Procedures 1. IF Bandpass Adjustment Equipment Digital voltmeter ............3456A DVM test leads ............34118A Special tuning tool (use with slotted tuning slugs) ........8710-1010 Special tuning tool (use with forked tuning slugs) .......... 8710-0772 Procedure 1. Turn the spectrum analyzer off by pressing .
Page 89 Manual Adjustment Procedures 1. IF Bandpass Adjustment Figure 3-6 A5J6 Pin Locations LC Bandpass Adjustments 4. On the spectrum analyzer, press . Wait for the ADJ CURR IF STATE IF ADJUST STATUS message to disappear before continuing with the next step. 5.
Page 90 Manual Adjustment Procedures 1. IF Bandpass Adjustment 9. Move the positive DVM test lead to A5TP2 (this is a resistor-lead type of test point). 10.Adjust A5L700 LC CTR 3 by repeating steps 4 through 6. 11.Move the positive DVM test lead to A5TP1 (this is a resistor-lead type of test point).
Page 91 Manual Adjustment Procedures 1. IF Bandpass Adjustment XTAL Bandpass Adjustments 13.On the spectrum analyzer, press , 1, , and SPAN 14.Move the positive DVM test lead to A5TP7. 15.On the spectrum analyzer, press . Wait for the ADJ CURR IF STATE IF ADJUST STATUS message to disappear before continuing to the next step.
Page 92 Manual Adjustment Procedures 1. IF Bandpass Adjustment Table 3-7 XTAL Factory-Selected Capacitor Selection Currently Loaded Capacitor Value (pF) Reading (V) Replace Replace Replace Replace Replace Replace 15 with: 18 with: 20 with: 22 with: 24 with: 27 with: 0 to 1.5 1.5 to 2.5 2.5 to 3.5 3.5 to 4.5...
Page 93: If Amplitude Adjustments
Manual Adjustment Procedures 2. IF Amplitude Adjustments . IF Amplitude Adjustments The IF amplitude adjustments consist of the cal oscillator amplitude adjustment and the reference 15 dB attenuator adjustment. Assembly Adjusted A4 log amp/cal oscillator A5 IF assembly Related Performance Tests IF Gain Uncertainty Scale Fidelity Description This adjustment sets the output amplitude of the A4 log amp/cal...
Page 94 Manual Adjustment Procedures 2. IF Amplitude Adjustments Figure 3-7 IF Amplitude Adjustment Setup Equipment Frequency synthesizer ..........3335A Adapters Type N (m) to BNC (f) ..........1250-1476 Type N (f) to 2.4 mm (f) ............11903B Cables BNC, 122 cm (48 in) 10503A Test cable 85680-60093 Chapter 3...
Page 95 Manual Adjustment Procedures 2. IF Amplitude Adjustments Figure 3-8 IF Amplitude Adjustment Locations The 15 dB reference attenuator adjustment is preset at the factory and NOTE need not be done if the entire A5 IF assembly is replaced. Procedure 1. Press to turn the spectrum analyzer off.
Page 96 Manual Adjustment Procedures 2. IF Amplitude Adjustments 6. If the marker reads less than −60.1 dBm, rotate A4R826 CAL OSC AMPTD one-third turn clockwise for every 0.1 dB less than −60 dBm. If the marker reads greater than −59.9 dBm, rotate A4R826 CAL OSC AMPTD one-third turn counter clockwise for every 0.1 dB greater than −60 dBm.
Page 97 Manual Adjustment Procedures 2. IF Amplitude Adjustments A5 Adjustment Veriﬁcation 21.On the spectrum analyzer, disconnect W29 from A5J3. Connect the test cable between A5J3 and the 50Ω output of the 3335A. 22.Set the spectrum analyzer reference level to −10 dBm. to −5 dBm.
Page 98: Dc Log Ampli Er Adjustments
Manual Adjustment Procedures 3. DC Log Ampliﬁer Adjustments . DC Log Ampliﬁer Adjustments There are three DC log adjustments; limiter phase, linear ﬁdelity, and log ﬁdelity. Assembly Adjusted A4 log amp/cal oscillator Related Performance Tests IF Gain Uncertainty Scale Fidelity Description These three adjustment need only be done under the following conditions:...
Page 99 Manual Adjustment Procedures 3. DC Log Ampliﬁer Adjustments Figure 3-9 DC Log Adjustment Setup Equipment Frequency synthesizer ........... 3335A Adapters Type N (m) to BNC (f) ............ 1250-1476 Type N (f) to 2.4 mm (f) ..........11903B Cables BNC, 122 cm (48 in) ............ 10503A Test cable ..............
Page 100 Manual Adjustment Procedures 3. DC Log Ampliﬁer Adjustments Figure 3-10 DC Log Adjustment Locations Adjustments should be made with all of the shields on and only after NOTE allowing at least a 20 minute warmup. A4 Limiter Phase Adjustment 1. Press to turn the spectrum analyzer off.
Page 101 Manual Adjustment Procedures 3. DC Log Ampliﬁer Adjustments 4. Set up an 3335A as follows: Frequency ..............15 MHz Amplitude ..............−18 dBm 5. Press , wait for the analyzer to complete ADJ CURR IF STATE adjustments then press 6. Adjust A4R445 for maximum on-screen amplitude. Refer to Figure 3-10 on page 123 for the location of A4R445.
Page 102 Manual Adjustment Procedures 3. DC Log Ampliﬁer Adjustments 3. Press (OFF), PRESET IF ADJ ON OFF ADJ CURR IF STATE 4. Set the spectrum analyzer controls as follows: Center frequency ............ 15 MHz Span ................... 0 Resolution bandwidth ........... 300 kHz Reference level ............
Page 103: Sampling Oscillator Adjustment
Manual Adjustment Procedures 4. Sampling Oscillator Adjustment . Sampling Oscillator Adjustment Assembly Adjusted A15 RF assembly Related Performance Test There is no related performance test for this adjustment procedure. Description The sampling oscillator tank circuit is adjusted for a tuning voltage of 5.05 V dc when the sampling oscillator is set to 297.222 MHz.
Page 104 Manual Adjustment Procedures 4. Sampling Oscillator Adjustment Procedure 1. Press to turn the spectrum analyzer off and disconnect the line LINE power cord. Remove the spectrum analyzer cover and fold down the A15 RF and A14 frequency control assemblies. Prop up the A14 frequency control assembly.
Page 105 Manual Adjustment Procedures 4. Sampling Oscillator Adjustment Sampler Match Adjustment 1. Connect the negative DVM test lead to A15J400 pin 6, and the positive DVM test lead to A15J400 pin 1. 2. Press and set the spectrum analyzer center frequency FREQUENCY to 2302.3 MHz.
Page 106 Manual Adjustment Procedures 4. Sampling Oscillator Adjustment Table 3-9 Sampling Adjustments Center Sampling Displayed Voltage (Vdc) Frequency Oscillator (MHz) (MHz) 2196.3 295.000 2378.3 296.471 2422.3 297.222 Chapter 3...
Page 107: Related Performance Tests
Manual Adjustment Procedures 5. YTO Adjustment . YTO Adjustment Assembly Adjusted A14 frequency control assembly Related Performance Tests Frequency Span Accuracy Frequency Readout Accuracy and Frequency Count Marker Accuracy Description The YTO main coil adjustments are made with the phase-lock loops disabled.
Page 108: Equipment
Manual Adjustment Procedures 5. YTO Adjustment Equipment Microwave frequency counter ....... 5343A Option 001 Adapters Type N (m) to BNC (f) ........... 1250-1476 Type N (f) to 2.4 mm (f) ............11903B APC 3.5 (f) to APC 3.5 (f) ..........5061-5311 Cables BNC, 122 cm (48 in) ............
Page 109 Manual Adjustment Procedures 5. YTO Adjustment 6. Adjust A14R93 3.2 GHz for the appropriate frequency counter reading of 3.200 GHz ±1 MHz. 7. On the spectrum analyzer, press STATE 1 8. Adjust A14R42 6.01 GHz for a frequency counter reading of 6.010 GHz ±1 MHz.
Page 110 Manual Adjustment Procedures 5. YTO Adjustment 11.Place the jumper on A14J23 in the NORM position (pins 1 and 2 jumpered). 12.Disconnect the SMA cable from the 1ST LO OUTPUT jack and reconnect the 50Ω termination on the 1ST LO OUTPUT. YTO FM Coil Adjustments 13.On the spectrum analyzer, press and set the controls as...
Page 111: Assembly Adjusted
Manual Adjustment Procedures 6. Calibrator Amplitude Adjustment . Calibrator Amplitude Adjustment Assembly Adjusted A15 RF assembly Related Performance Test Calibrator Amplitude and Frequency Accuracy Description The CAL OUTPUT amplitude is adjusted for −10.00 dBm measured directly at the front panel CAL OUTPUT connector. Figure 3-15 Calibrator Amplitude Adjustment Setup Equipment...
Page 112 Manual Adjustment Procedures 6. Calibrator Amplitude Adjustment Procedure The spectrum analyzer should be allowed to warm up for at least NOTE 30 minutes before performing this adjustment. 1. Place the spectrum analyzer in the service position shown in Figure 3-15 on page 134.
Page 113: Description
Manual Adjustment Procedures 7. 10 MHz Reference Adjustment — OCXO . 10 MHz Reference Adjustment — OCXO Assembly Adjusted A21 OCXO assembly Replacement oscillators are factory adjusted after a complete warmup NOTE and after the speciﬁed aging rate has been achieved. Thus, readjustment should typically not be necessary after oscillator replacement and is generally not recommended.
Page 114: Equipment
Manual Adjustment Procedures 7. 10 MHz Reference Adjustment — OCXO Figure 3-16 10 MHz Reference Adjustment Setup and Adjustment Location Equipment Frequency counter ............5334A/B Frequency standard ....5061B Cesium Beam Standard Cable BNC, 122 cm (2 required)............ 10503A Chapter 3...
Page 115: Procedure
Manual Adjustment Procedures 7. 10 MHz Reference Adjustment — OCXO Procedure Failure to allow a 24 hour minimum warmup time for OCXO frequency NOTE and temperature stabilization may result in oscillator misadjustment. 1. Connect equipment as shown in Figure 3-16 on page 137 as follows: a.
Page 116 Manual Adjustment Procedures 7. 10 MHz Reference Adjustment — OCXO 7. Use a nonconductive adjustment tool to adjust the FREQ ADJ control on the A21 OCXO for a frequency counter reading of 0.00 Hz. 8. On the 5334A/B frequency counter, select a 10-second gate time by pressing , 10, .
Page 117: Mhz Reference Adjustment - Tcxo (Option 103)
Manual Adjustment Procedures 8 . 10 MHz Reference Adjustment — TCXO (Option 103) . 10 MHz Reference Adjustment — TCXO (Option 103) Assembly Adjusted A15 RF assembly Related Performance Test 10 MHz Reference Output Accuracy (Option 103) Description The frequency counter is connected to the analyzer CAL OUTPUT. The CAL OUTPUT is locked to the 10 MHz frequency reference which yields better effective resolution.
Page 118 Manual Adjustment Procedures 8 . 10 MHz Reference Adjustment — TCXO (Option 103) Equipment Microwave frequency counter ......5343A Option 001 Frequency standard ....5061B Cesium Beam Standard −10 (or any 10 MHz frequency standard with accuracy <±1 X 10 Cables BNC, 122 cm (2 required) ...........
Page 119: Description
Manual Adjustment Procedures 9 . Demodulator Adjustment . Demodulator Adjustment Assembly Adjusted A4 log ampliﬁer/cal oscillator assembly Related Performance Test There is no related performance test for this adjustment. Description A 5 kHz peak-deviation FM signal is applied to the INPUT 50Ω . The detected audio is monitored by an oscilloscope.
Page 120: Equipment
Manual Adjustment Procedures 9 . Demodulator Adjustment Equipment AM/FM signal generator ........... 8640B Oscilloscope ..............54501A Adapters Type N (m) to BNC (f) (2 required) ......1250-1476 Type N (f) to 2.4 mm (f) ........... 11903B Cables BNC, 122 cm (48 in) ............10503A Oscilloscope probe ............
Page 121 Manual Adjustment Procedures 9 . Demodulator Adjustment 5. Set the oscilloscope controls as follows: Channel 1 ................. on Channel 2 ................. off Channel 1 ............. 50 mV/division Channel 1 ................ac Channel 1 ..............BW lim Time base ............ 1.0 ms/division Trigger ................
Page 122: Description
Manual Adjustment Procedures 10 . External Mixer Bias Adjustment . External Mixer Bias Adjustment Assembly Adjusted A15 RF assembly Related Performance Test There is no related performance test for this adjustment. Description A voltmeter is connected to the spectrum analyzer IF INPUT with the external mixer bias set to off.
Page 123: Procedure
Manual Adjustment Procedures 10 . External Mixer Bias Adjustment Procedure 1. Press to turn the spectrum analyzer off, and disconnect the ac LINE power cord. Remove the spectrum analyzer cover and connect the equipment as illustrated in Figure 3-20 on page 145.
Page 124: External Mixer Amplitude Adjustment
Manual Adjustment Procedures 11 . External Mixer Amplitude Adjustment . External Mixer Amplitude Adjustment Assembly Adjusted A15 RF assembly Related Performance Test IF Input Amplitude Accuracy Description The slope of the ﬂatness compensation ampliﬁers is determined. The user-loaded conversion losses for K-band are recorded and reset to 30 dB.
Page 125: Equipment
Manual Adjustment Procedures 11 . External Mixer Amplitude Adjustment Equipment Synthesized sweeper ............. 8340A/B Measuring receiver ............8902A Power sensor ..............8481D 50 MHz reference attenuator ......... 11708A (supplied with 8481D) Adapters Type N (f) to SMA (f) ........... 1250-1772 Type N (m) to BNC (f) ..........
Page 126 Manual Adjustment Procedures 11 . External Mixer Amplitude Adjustment 6. If all conversion loss values equal 30 dB, skip to step 7, otherwise continue to step a. ⇓ ⇓ a. Refer to Table 3-10 on page 149 and press to select a frequency at which the conversion loss value does not equal 30 dB.
Page 127 Manual Adjustment Procedures 11 . External Mixer Amplitude Adjustment 15.Place the WR PROT/ WR ENA jumper on the A2 controller assembly in the WR PROT position. The following steps should only be performed if you need to replace the NOTE 30 dB conversion loss values to those recorded in Table 3-10 on page...
Page 128: Procedure
Manual Adjustment Procedures 13 . 600 MHz Reference Adjustment . 600 MHz Reference Adjustment Assembly Adjusted A15 RF assembly Related Performance Test There is no related performance test for this adjustment. Description The 100 MHz VCXO and the tripler are adjusted for a maximum signal level at 600 MHz.
Page 129: 3A. Manual Adjustment Procedures: 3335A Source Not Available
Manual Adjustment Procedures: 3335A Source not Available...
Page 130 Manual Adjustment Procedures: 3335A Source not Available What You'll Find in This Chapter What You'll Find in This Chapter This chapter provides alternative procedures for the adjustment of the spectrum analyzer that do not require the use of the 3335A Synthesizer Level Generator.
Page 131 Manual Adjustment Procedures: 3335A Source not Available Required Test Equipment Required Test Equipment The following table lists the test equipment required to execute the adjustments in this chapter. These adjustments originally required the use of the 3335A Synthesizer Level Generator. Table 3a-1 Recommended Test Equipment Instrument...
Page 132: Description
Manual Adjustment Procedures: 3335A Source not Available 2a. IF Amplitude Adjustments . IF Amplitude Adjustments The IF amplitude adjustments consist of the cal oscillator amplitude adjustment and the reference 15 dB attenuator adjustment. Assembly Adjusted A4 log amp/cal oscillator A5 IF assembly Related Performance Tests IF Gain Uncertainty Scale Fidelity Description...
Page 133: Equipment
Manual Adjustment Procedures: 3335A Source not Available 2a . IF Amplitude Adjustments Equipment Signal Generator ....... . . E4421B Adapters Type N (m) to BNC (f) .
Page 134 Manual Adjustment Procedures: 3335A Source not Available 2a. IF Amplitude Adjustments 3. Set the spectrum analyzer controls as follows: Center Frequency ......10.7 MHz Span .
Page 135: A5 Reference Attenuator Adjustment
Manual Adjustment Procedures: 3335A Source not Available 2a . IF Amplitude Adjustments A5 Reference Attenuator Adjustment 1. Set the spectrum analyzer reference level to −60 dBm. If markers are displayed, press MARKERS OFF to −60 dBm. 2. Set the E4421B AMPLITUDE 3.
Page 136 Manual Adjustment Procedures: 3335A Source not Available 2a. IF Amplitude Adjustments 6. On the spectrum analyzer, reconnect W29 to A5J3. Press PRESET and set the controls as follows: Center frequency ......300 MHz Span .
Page 137: Assembly Adjusted
Manual Adjustment Procedures: 3335A Source not Available 3a . DC Log Ampliﬁer Adjustments . DC Log Ampliﬁer Adjustments There are three DC log adjustments; limiter phase, linear ﬁdelity, and log ﬁdelity. Assembly Adjusted A4 log amp/cal oscillator Related Performance Tests IF Gain Uncertainty Scale Fidelity Description These three adjustment need only be done under the following...
Page 138: Equipment
Manual Adjustment Procedures: 3335A Source not Available 3a. DC Log Ampliﬁer Adjustments Figure 3a-3 DC Log Adjustment Setup Equipment Signal Generator ......E4421B Adapters Type N (m) to BNC (f) .
Page 139: A4 Limiter Phase Adjustment
Manual Adjustment Procedures: 3335A Source not Available 3a . DC Log Ampliﬁer Adjustments Figure 3a-4 DC Log Adjustment Locations Adjustments should be made with all of the shields on and only after NOTE allowing at least a 20 minute warmup. A4 Limiter Phase Adjustment 1.
Page 140: A4 Linear Fidelity Adjustment
Manual Adjustment Procedures: 3335A Source not Available 3a. DC Log Ampliﬁer Adjustments 4. Set up an E4421B as follows: Frequency ........15 MHz Amplitude .
Page 141: A4 Log Fidelity Adjustment
Manual Adjustment Procedures: 3335A Source not Available 3a . DC Log Ampliﬁer Adjustments 10.If the signal is higher than expected (delta marker amplitude reads greater than −38 dB) then adjust A4R544 for an even higher level signal and press . Allow sufﬁcient time ADJ CURR IF STATE for the analyzer to complete the adjustment.
Page 142: Assembly Replacement
Assembly Replacement...
Page 143: Introduction
Assembly Replacement Introduction Introduction This chapter describes the removal and replacement of all major assemblies. The following replacement procedures are provided: Page Access to Internal Assemblies ............. page 177 Cable Color Code .................. page 178 Required Tools ..................page 178 Procedure 1.
Page 144: Access To Internal Assemblies
Access to Internal Assemblies Access to Internal Assemblies Servicing the 8564EC or the 8565EC requires the removal of the spectrum analyzer cover assembly and the folding down of six board assemblies. Four of these assemblies lay ﬂat along the top of the spectrum analyzer and two lay ﬂat along the bottom of the spectrum...
Page 145: Cable Color Code
Assembly Replacement Cable Color Code Cable Color Code Coaxial cables and wires will be identiﬁed in the procedures by reference designation or name followed by a color code. The code is identical to the resistor color code. The ﬁrst number indicates the base color with second and third numbers indicating any colored stripes.
Page 146: Procedure 1. Spectrum Analyzer Cover
Assembly Replacement Procedure 1. Spectrum Analyzer Cover Procedure 1. Spectrum Analyzer Cover Removal/Replacement 1. Disconnect the line-power cord, remove any adapters from the front panel connectors, and place the spectrum analyzer on its front panel. 2. If an 85620A Mass Memory Module or 85629B Test and Adjustment Module is mounted on the rear panel, remove it.
Page 147: Removal Of The Front Frame
Assembly Replacement Procedure 2. A1 Front Frame/A18 LCD Procedure 2. A1 Front Frame/A18 LCD Removal of the Front Frame 1. Remove the spectrum analyzer cover assembly as described in "Procedure 1. Spectrum Analyzer Cover." Place the instrument on its side, with the display section upper-most, as shown in Figure 4-1 on page 179.
Page 148 Assembly Replacement Procedure 2. A1 Front Frame/A18 LCD 8. Disconnect the following connectors which are attached to the inside of the A1 front panel assembly: a. INPUT 50 Ω RF connector. Use a 5/16-inch open-end wrench to disconnect cable W41 from the front panel. Loosen the opposite end of cable W41, which is connected to the attenuator.
Page 149: Removal Of The Display Driver Board, Inverter Board, And Lcd
Assembly Replacement Procedure 2. A1 Front Frame/A18 LC Removal of the Display Driver Board, Inverter Board, and LCD After the front panel has been removed, follow these steps to remove the display driver and LCD: 1. Disconnect the following cables from the A17 display driver board. These can be disconnected through openings in the display driver shield.
Page 150: Removal Of The Backlights
Assembly Replacement Procedure 2. A1 Front Frame/A18 LCD 10.Carefully lift the display driver backplate over the two backlight cables and the W63 ribbon cable. 11.Remove the LCD assembly from the black rubber mount Take care not to damage the backlight cables or W63 ribbon cable. 12.To remove the glass plate, ﬁrst remove the LCD display from the display mount.
Page 151 Assembly Replacement Procedure 2. A1 Front Frame/A18 LCD Figure 4-2 LCD Assembly - Exploded View Chapter 4...
Page 152: Removal Of The Keyboard
Assembly Replacement Procedure 2. A1 Front Frame/A18 LCD Removal of the Keyboard 1. Disconnect cable A1A1W1 from HDR1 on the A1 front panel assembly and from A3J602 on the A3 interface board. 2. Disconnect the power probe cable from the probe power connector on the front frame PC board.
Page 153 Assembly Replacement Procedure 2. A1 Front Frame/A18 LCD c. 1ST LO OUTPUT connector. Connect cable W42 from A7J3 to the front panel 1st LO OUTPUT connector. To replace the 1st LO OUTPUT connector use a 5/16 socket and thread pliers. Use the pliers to hold the 1st LO connector in place, while tightening the connector inside the instrument with the 5/16-inch socket.
Page 154: Replacement Of The Display Driver Board, Inverter Board, And Lcd
Assembly Replacement Procedure 2. A1 Front Frame/A18 LCD a. W60, the large ribbon cable (80 lines) that goes to J8 on the A2 controller board. b. W61, a coax cable that connects to J10 on the A2 controller board. c. W64, the VGA ribbon cable (10 lines), that goes to J1 on the rear panel.
Page 155 Assembly Replacement Procedure 2. A1 Front Frame/A18 LCD 6. Secure the LCD backplate to the chassis. a. Insert four (0515-0444) screws into the right side of the backplate. Use a T-8 TORX driver. b. Insert two large (0515-0382) screws into the left side of the LCD backplate.
Page 156: Replacing The Backlights
Assembly Replacement Procedure 2. A1 Front Frame/A18 LCD Replacing the Backlights 1. If the LCD or backlights have not been removed from the front frame, follow the procedures outlined in “Removal of the Front Frame” on page 180, “Removal of the Display Driver Board, Inverter Board, and LCD”...
Page 157 Assembly Replacement Procedure 2. A1 Front Frame/A18 LCD 3. Connect the power probe cable to the connector that is labelled “probe power” on the front frame PC board. 4. Connect A1A1W1 from HDR1 on A1 front frame assembly to A3J602 on the A3 interface board.
Page 158: Removal
Procedure 3. A1A1 Keyboard/Front Panel Keys Removal 1. Remove the front frame from the spectrum analyzer. Place the front frame face down on the bench. For 8564EC and 8565EC instruments, follow the instructions in “Procedure 2. A1 Front Frame/A18 LCD.”...
Page 159: Removal
Assembly Replacement Procedure 4. A1A2 RPG Procedure 4. A1A2 RPG Removal 1. Remove the A9 input attenuator as described in “Procedure . A7 through A13 Assemblies.” 2. Disconnect the RPG cable from the A1A1 keyboard assembly. 3. Pull the front panel RPG knob off of the face of the front panel of the spectrum analyzer.
Page 160: Removal
Assembly Replacement Procedure 5. A2, A3, A4, and A5 Assemblies Procedure 5. A2, A3, A4, and A5 Assemblies Removal 1. Remove the spectrum analyzer cover. 2. Place the spectrum analyzer on its right side frame. 3. Remove the eight screws holding the A2, A3, A4, and A5 assemblies to the top of the spectrum analyzer.
Page 161 Assembly Replacement Procedure 5. A2, A3, A4, and A5 Assemblies Figure 4-8 A2, A3, A4, and A5 Assembly Removal Replacement 1. Place the spectrum analyzer on its right side on the work bench. 2. Attach the assembly being installed to the two chassis hinges with two panhead screws.
Page 162 Assembly Replacement Procedure 5. A2, A3, A4, and A5 Assemblies 6. Lay the A2, A3, A4, and A5 assemblies ﬂat against each other in the folded-out position. Make sure that no cables become pinched between the two assemblies. Figure 4-9 Assembly Cables (1 of 3) Chapter 4...
Page 163 Assembly Replacement Procedure 5. A2, A3, A4, and A5 Assemblies Figure 4-10 Assembly Cables (2 of 3) Chapter 4...
Page 164 Assembly Replacement Procedure 5. A2, A3, A4, and A5 Assemblies Figure 4-12 Coaxial Cable Clip 7. Check to ensure that no cables will become pinched under the hinges when folding up the A4 and A5 assemblies. Chapter 4...
Page 165 Assembly Replacement Procedure 5. A2, A3, A4, and A5 Assemblies 8. Fold the A4 and A5 assemblies together as a unit into the spectrum analyzer. Use caution to avoid damaging any cable assemblies. The standoffs on the A5 assembly must ﬁt into the cups on the A6 power supply top shield.
Page 166 Assembly Replacement Procedure 5. A2, A3, A4, and A5 Assemblies Figure 4-14 GPIB and A1A1 W1 Cable Placement Chapter 4...
Page 167: Removal
Assembly Replacement Procedure 6. A6 Power Supply Assembly Procedure 6. A6 Power Supply Assembly Removal The A6 Power Supply assembly contains lethal voltages with WARNING lethal currents in all areas. Use extreme care when servicing this assembly. Always disconnect the power cord from the instrument before beginning this replacement procedure.
Page 168 Assembly Replacement Procedure 6. A6 Power Supply Assembly Figure 4-15 Power Supply Cover Chapter 4...
Page 169: Replacement
Assembly Replacement Procedure 6. A6 Power Supply Assembly Replacement 1. Ensure that the bottom shield wall is in place before replacing the A6 power supply assembly. 2. Attach the A6 power supply assembly to the spectrum analyzer chassis and top shield wall using the four screws, torqued to 10-inch lbs.
Page 170: Procedure 7. A7 Through A13 Assemblies
Assembly Replacement Procedure 7. A7 through A13 Assemblies Procedure . A7 through A13 Assemblies A separate replacement procedure is supplied for each assembly listed below: * • A7 LO Multiplier/Ampliﬁer (LOMA) • A8 Low Band Mixer • A9 Input Attenuator •...
Page 171 Assembly Replacement Procedure 7. A7 through A13 Assemblies Figure 4-20 8564ECand 8565EC Assembly Locations Chapter 4...
Page 172: Removal
Assembly Replacement A7 LO Multiplier/Ampliﬁer (LOMA) A7 LO Multiplier/Ampliﬁer (LOMA) Removal 1. Remove the two screws securing the A7 assembly to the spectrum analyzer center deck. 2. Use a 5/16-inch wrench to disconnect W46, W28, W39, W42, W30, and W38 from the A7 assembly. 3.
Page 173: Removal
Assembly Replacement A8 Low Band Mixer Removal 1. Place the spectrum analyzer upside-down on the work bench with A14 and A15 folded out to the left. Use a 5/16-inch wrench to remove W45 between FL1 and AT1. (For Option 006, remove W45 between FL1 and A8J1.) 3.
Page 174: Removal
Assembly Replacement A9 Input Attenuator A9 Input Attenuator Removal 1. Place the spectrum analyzer upside-down on the work bench. 2. Disconnect W16 ribbon cable from the A10/A12 assembly and move it out of the way. 3. Remove screw (1) and the cable clamp securing FL3 to the attenuator mounting bracket.
Page 175: Replacement
Assembly Replacement A9 Input Attenuator 4. Disconnect W30 from A7 and move this cable/ﬁlter out of the way. 5. Remove the three screws (2) securing the A9 input attenuator mounting bracket to the center deck. See Figure 4-22 on page 226.
Page 176 Assembly Replacement A9 Input Attenuator Figure 4-22 A9 and A10/A12 Mounting Screws Chapter 4...
Page 177: Removal
Assembly Replacement A10/A12 RYTHM/SBTX A10/A12 RYTHM/SBTX Removal Do NOT remove the brackets from the A10/A12 assembly. If these CAUTION brackets are removed and reinstalled, the performance of the spectrum analyzer will be altered. A new or rebuilt A10/A12 assembly includes new mounting brackets already attached to it.
Page 178: A11 Yto
Assembly Replacement A11 YTO A11 YTO Removal 1. Carefully disconnect W43 semirigid cable from A9J2 and A12J3 and move it out of the way. 2. Remove W56/FL2/W57 (as a unit) and disconnect W38 at the A11 assembly. 3. Remove four screws (1) securing A11 to the right-side frame. See Figure 4-23, “A11 Mounting Screws at Right Side Frame.”...
Page 179 Assembly Replacement A11 YTO Figure 4-23 A11 Mounting Screws at Right Side Frame Chapter 4...
Page 180: Removal
Assembly Replacement A13 Second Converter A13 Second Converter Turn off the spectrum analyzer power when replacing the A13 second CAUTION converter assembly. Failure to turn off the power may result in damage to the assembly. Removal 1. Place the spectrum analyzer upside-down on the work bench. 2.
Page 181: Removal
Assembly Replacement Procedure 8. A14 and A15 Assemblies Procedure . A14 and A15 Assemblies Removal 1. Remove the spectrum analyzer cover as described in "Procedure 1. Spectrum Analyzer Cover." 2. Place the spectrum analyzer on its right side frame. 3. Remove the eight screws (1) holding the A14 and A15 assemblies to the bottom of the spectrum analyzer.
Page 182: Replacement (Using Contact Removal Tool, Part Number 8710-1791)
Assembly Replacement Procedure 8. A14 and A15 Assemblies DO NOT fold the board assemblies out of the spectrum analyzer one at CAUTION a time. Always fold the A14 and A15 assemblies as a unit. Folding out one assembly at a time binds the hinges attaching the assemblies and may damage an assembly and hinge.
Page 183 Assembly Replacement Procedure 8. A14 and A15 Assemblies Figure 4-25 A14 and A15 Assembly Cables Chapter 4...
Page 184: Procedure 9. B1 Fan
Assembly Replacement Procedure 9 . B1 Fan Procedure . B1 Fan Removal/Replacement Always disconnect the power cord from the instrument before WARNING beginning this replacement procedure. Failure to follow this precaution can present a shock hazard which may result in personal injury.
Page 185: Procedure 10. Bt1 Battery
Assembly Replacement Procedure 10 . BT1 Battery Procedure . BT1 Battery Battery BT1 contains lithium polycarbon monoﬂuoride. Do not WARNING incinerate or puncture this battery. Dispose of discharged battery in a safe manner. To avoid loss of the calibration constants stored on the A2 controller CAUTION assembly, connect the spectrum analyzer to the main power source and turn on before removing the battery.
Page 186: Procedure 11. Rear Frame/Rear Dress Panel
Assembly Replacement Procedure 11 . Rear Frame/Rear Dress Panel Procedure . Rear Frame/Rear Dress Panel Removal The A6 power supply WARNING assemblies contain lethal voltages with lethal currents in all areas. Use extreme care when servicing these assemblies. Always disconnect the power cord from the instrument before beginning this replacement procedure.
Page 187 Assembly Replacement Procedure 11 . Rear Frame/Rear Dress Panel .Remove the three screws securing the power-supply shield to the power supply, and remove the shield. See (1) in Figure 4-2 on page 184. .Disconnect the fan and line-power cables from A6J3 and A6J101 on the A6 power supply assembly.
Page 188 Assembly Replacement Procedure 11 . Rear Frame/Rear Dress Panel Figure 4-28 Main Deck Screws Replacement 1. If the rear dress panel is removed, secure it to the rear frame using two nuts. Ensure that the dress panel is aligned with the frame. 2.
Page 189 Assembly Replacement Procedure 11 . Rear Frame/Rear Dress Panel 5. Secure the rear frame to the spectrum analyzer main deck, using four panhead screws (1). See Figure 4-28 on page 241. 6. Secure the rear frame to the spectrum analyzer side frames using three ﬂathead screws per side.
Page 190 Assembly Replacement Procedure 11 . Rear Frame/Rear Dress Panel Figure 4-29 A6 Power Supply Cover Chapter 4...
Page 191: Procedure 15. Eerom
11.If error message 719 or 720 is displayed, the model number and/or the option information has been corrupted. The spectrum analyzer must be returned to an Agilent Technologies customer service center to have this data restored. 12.If error message 704 is displayed, press...
Page 192 Assembly Replacement Procedure 12 . EEROM 13.If there are no errors after cycling the spectrum analyzer power, the EEROM is working properly, but the frequency-response correction data might be invalid. Check the spectrum analyzer frequency response. 14.Place the WR PROT/WR ENA jumper in the WR PROT position. 15.Fold the A2 and A3 assemblies into the spectrum analyzer as described in “Procedure 5.
Page 193: Procedure 16. A21 Ocxo
Assembly Replacement Procedure 13 . A21 OCXO Procedure . A21 OCXO Removal 1. Remove the rear frame assembly as described in “Procedure Rear Frame/Rear Dress Panel,” steps 1 through 20. 2. Place the spectrum analyzer on its right-side frame. 3. Fold out the A14 and A15 assemblies as described in "Procedure 9. A14 and A15 Assemblies Removal,"...
Page 194 Assembly Replacement Procedure 13 . A21 OCXO Figure 4-34 A21 OCXO Mounting Screws Chapter 4...
Page 195: Replacement
Assembly Replacement Procedure 13 . A21 OCXO Replacement Ensure that the insulator is installed between the A21 OCXO and the CAUTION main deck. Failure to do so will result in damage to the instrument by shorting the power supply. 1. Connect W49, coax 82, to the OCXO and position the OCXO in the spectrum analyzer.
Page 196: Replaceable Parts
Replaceable Parts...
Page 197: Introduction
Replaceable Parts Introduction Introduction This chapter contains information on ordering all replaceable parts and assemblies. Locate the instrument parts in the following ﬁgures and tables: Table 5-1 on page 264 .Reference Designations Table 5-2 on page 265 . Abbreviations Table 5-3 on page 269 .
Page 198: Ordering Information
To order a part or assembly, quote the part number, indicate the quantity required, and address the order to the nearest Agilent Technologies ofﬁce. See Table 1-5 on page To order a part that is not listed in the replaceable parts table, include the instrument model number, the description and function of the part, and the number of parts required.
Page 199: Direct Phone-Order System
Replaceable Parts Ordering Information Direct Phone-Order System Within the USA, a phone order system is available for regular and hotline replacement parts service. A toll-free phone number is available, and Mastercard and Visa are accepted. Regular Orders: The toll-free phone number, (800) 227-8164, is available 6 am to 5 pm, Paciﬁc time, Monday through Friday.
Page 200: Parts List Format
Replaceable Parts Parts List Format Parts List Format The following information is listed for each part: 1. The part number. 2. The total quantity (Qty) in the assembly. This quantity is given only once, at the ﬁrst appearance of the part in the list. 3.
Page 201 Replaceable Parts Reference Designations Table 5-1 Reference Designations REFERENCE DESIGNATIONS Assembly Fuse Thermistor Attenuator, Filter Switch Isolator, Limiter, Circulator Transformer Termination Fan, Motor Electrical Terminal Connector Board Battery (Stationary Thermocouple Portion), Capacitor Jack Test Point Coupler Relay Integrated Circuit, Diode, Diode Coil, Inductor Microcircuit Thyristor,...
Page 202 Replaceable Parts Abbreviations Table 5-2 Abbreviations ABBREVIATIONS CONT Contact, Continuous, Across Flats, Capacitance, Control, Acrylic, Air (Dry Capacitor, Controller Method), Ampere Center Tapped, CONV Converter Adjust, Cermet, Cold, CPRSN Compression Adjustment ANSI American Compression CUP-PT Cup Point National Standards Carbon Clockwise, Institute Composition...
Page 203 Replaceable Parts Abbreviations Table 5-2 Abbreviations Hexadecimal, DIP-SLDR Dip Solder FDTHRU Feedthrough Hexagon, D-MODE Depletion Female Hexagonal Mode Package Type FIL-HD Fillister Head HLCL Helical Designation Flash, Flat, Hewlett-Packa Fluid Deep, Depth, FLAT-PT Flat Point Company, Dia- High Pass metric Pitch, Front DP3T Double Pole...
Page 204 Replaceable Parts Abbreviations Table 5-2 Abbreviations PAN-HD Pan Head Printed Circuit Link, Lock Nano, None Printed Circuit Leakage, N-CHAN N-Channel Board Locking Luminous Nanohenry P-CHAN P-Channel Nanometer, Pad, Power Nonmetallic Dissipation Normally Open, Picofarad, Power Male, Number Factor Maximum, Mega, Mil, Nominal Package Milli,...
Page 205 Replaceable Parts Abbreviations Table 5-2 Abbreviations SPDT Single Pole Microfarad Range, Red, SPST Single Pole Microhenry Resistance, Single Throw Microliter, Resistor, Right, Ring Square Underwriters' Reference Stainless Steel Laboratories, Inc. Resistance, Steel UNHDND Unhardened Resistor Radio Frequency Rigid Variable, Violet, Round Teeth, Volt, Voltage...
Page 206 Replaceable Parts Multipliers Table 5-3 Reference Designations, Abbreviations, and Multipliers MULTIPLIERS Abbreviation Preﬁx Multiple Abbreviation Preﬁx Multiple −3 tera milli µ −6 giga micro −9 mega nano −12 kilo pico −15 deka femto −1 −18 deci atto −2 centi Chapter 5...
Page 207: Replaceable Parts
Replaceable Parts Replaceable Parts Replaceable Parts Table 5-4 Replaceable Parts Reference Part Qty Description Mfr Part Designation Number Code Number ACCESSORIES SUPPLIED 5063-0274 FRONT COVER 28480 5063-0274 85620A MASS MEMORY MODULE 28480 85620A 1810-0118 TERMINATION-COAXIAL SMA; 0.5W; 50Ω 16179 2003-6113-02 1250-1200 ADAPTER, SMA (m) TO BNC (f) 28480...
Page 208 8564/5EC Replacement Parts Reference Part Description Conditions Designator Number A1A1 Bd Assy - Keyboard 08563-60181 1990-1525 A1A2 RPG Assy Bd Assy - Controller 08563-60172 Bd Assy - Interface 08563-60174 08563-60163 Bd Assy - Log Amp / Cal Osc Bd Assy - IF Filter 08563-60178 08563-60180 <...
Page 209 Cable Assemblies Reference Part Number Description From Designator Ribbon Cables 8120-5682 Ribbon Cable - Main Power A6J1 - Power Supply Assembly A2J2 / A3J1 / A4J1 / A5J1 / A14J1 / A15J1 5061-9025 Ribbon Cable - Main Control A3J2 - Interface Board A4J2 / A5J2 / A14J2 / A15J2 8121-0063 Ribbon Cable - Option Module...
Page 210 Cable Assemblies Reference Part Number Description From Designator Flexible RF Cables (continued) 5062-0724 Cable - SMB/BNC - Gray/White - CAL Out A15J501 - RF Board Front Panel J5 - CAL OUT 8120-5660 Cable - SMB/SMA - RYTHM IF Out to 2nd Converter In A10J1 - RYTHM A13J3 - Second Converter 5062-4892...
Page 211 PCB Mounting Replacement Parts Part Item Description Quantity Number Screw-Machine w/Washer - Pan-HD - M3X0.5 - 30MM-LG 0515-1349 Screw-Machine w/Washer - Pan-HD - M3X0.5 - 60MM-LG 0515-2310 Screw-Machine w/Washer - Pan-HD - M3X0.5 - 110MM-LG 0515-2308 Screw-Machine w/Patch-LK - Pan-HD - M3X0.5 - 6MM-LG 0515-2332 Screw-Machine w/Washer - Pan-HD - M3X0.5 - 12MM-LG 0515-0664...
Page 212 Instrument Cover Replacement Parts Part Item Description Quantity Number Bail Handle 5041-8992 Trim Cap 5041-8912 Screw-Machine w/Patch-LK - Pan-HD - M4X0.7 - 10MM-LG 0515-1819 Spring 1460-2164 Ring Gear 5022-3789 Socket Gear 5022-3779 Handle Plate 5022-3780 Backup Plate 5001-8728 Screw-Machine w/Patch-LK - Flat-HD - M4X0.7 - 8MM-LG 0515-2043 Screw-Machine w/Patch-LK - Flat-HD - M5X0.8 - 16MM-LG 0515-2049...
Page 213 Main Chassis Replacement Parts Part Item Description Quantity Number Screw-Machine w/Lock-Washer - Pan-HD - M3X0.5 - 8MM-LG 0515-2145 Cover, A6 Power Supply (Includes Label) 5002-1010 Screw-Machine - Flat-HD - M3X0.5 - 45MM-LG 0515-2309 Main Deck 5002-1008 EMI Shield - Main Deck (Not Shown) 5002-1009 Screw-Machine - Flat-HD - M3X0.5 - 5MM-LG (Not Shown) 0515-1521...
Page 214 Front Frame Replacement Parts Part Item Description Quantity Number Nameplate - 8564EC 08564-80055 Nameplate - 8564EC - Option 006 08564-80056 Nameplate - 8565EC 08565-80054 Nameplate - 8565EC - Option 006 08565-80055 Overlay - Connector Dress Panel 5181-8245 Knob - RPG 5041-9610 Nut - 3/8-32-THD - .094-IN-THK...
Page 215 LCD Replacement Parts Part Item Description Quantity Number Screw-Machine w/Washer - Pan-HD - M3X0.5 - 6MM-LG 0515-0430 Screw-Machine w/Washer - Pan-HD - M3X0.5 - 8MM-LG 0515-0372 Rubber Grommet - Round - 0.219-IN-ID - 0.563-IN-OD - 0.062-IN-THK 0400-0333 Glass Filter 1000-1014 LCD Mount 5041-9632 LCD Backplate...
Page 216 Rear Frame Replacement Parts Part Item Description Quantity Number Screw-Machine - Flat-HD - M3X0.5 - 6MM-LG 0515-1946 Battery Holder (Includes Wiring) 5062-7755 Screw-Machine w/Patch-LK - Pan-HD - M4X0.7 - 40MM-LG 0515-2216 Fan Grill 3160-0309 Spacer - Round - 0.180-IN-ID - 0.250-IN-OD - 0.875-IN-LG 0380-0012 Hole Plug - D-Hole - 0.5-IN-D 6960-0149...
Page 217 RF Deck Replacement Parts Part Item Description Quantity Number Screw-Machine - Flat-HD - M3X0.5 - 16MM-LG 0515-1603 Screw-Machine w/Patch-LK - Pan-HD - M3X0.5 - 6MM-LG 0515-2332 Screw-Machine w/Patch-LK - Pan-HD - M3X0.5 - 6MM-LG 0515-2332 Filter Clamp 5021-7467 Screw-Machine w/Patch-LK - Pan-HD - M3X0.5 - 6MM-LG 0515-2332 Main Deck 5002-1008...
Page 224: Major Assembly And Cable Locations
Major Assembly and Cable Locations...
Page 225: Introduction
Major Assembly and Cable Locations Introduction Introduction This chapter identiﬁes the instrument's assemblies and cables and contains the following ﬁgures: Figure 6-1. Hinged Assemblies ........... page 306 Figure 6-2. Top View (A2 and A3 Unfolded)......page 307 Figure 6-3. Top View (A2, A3, A4, A5 Unfolded) ....page 308 Figure 6-5.
Page 226 Major Assembly and Cable Locations Introduction Cables Figure A1A1W1 Keyboard cable ............A19W1 GPIB cable ..............W1 Power cable, ribbon ..........6-3, 6-5, 6-6 W2 Control cable, ribbon .......... 6-3, 6-5, 6-6 W3 Line switch cable ..........6-2, 6-3, 6-8 W4 Option module cable ............
Page 227 Major Assembly and Cable Locations Introduction W40 Cal. Out (Coax 89) ............W41 Semirigid coax, front-panel J1 to A9J1 ......W42 Semirigid coax, A7J6 to front-panel J4 ......W43 Semirigid coax, A9J2 to A12J3 ........W44 Semirigid coax, A10J2 to FL1J1 ........W45 Semirigid coax, FL1J2 to A8J1 ........
Page 228 Major Assembly and Cable Locations Introduction Figure 6-2 Top View (A2 and A3 Unfolded) Chapter 6...
Page 229 Major Assembly and Cable Locations Introduction Figure 6-3 Top View (A2, A3, A4, and A5 Unfolded) Chapter 6...
Page 230 Major Assembly and Cable Locations Introduction Figure 6-5 Bottom View (A15 Unfolded) Chapter 6...
Page 231 Major Assembly and Cable Locations Introduction Figure 6-6 Bottom View (A15 and A14 Unfolded) Chapter 6...
Page 232 Major Assembly and Cable Locations Introduction Figure 6-8 Front End A10/A12 W46 W13 W38 Chapter 6...
Page 233 Major Assembly and Cable Locations Introduction Figure 6-9 Rear View VGA Connector BT1 / A20 Chapter 6...
Page 234: General Troubleshooting
General Troubleshooting...
Page 235: Introduction
General Troubleshooting Introduction Introduction This chapter provides information needed to troubleshoot your spectrum analyzer to one of the six major functional sections. Chapters 8 through 13 cover troubleshooting for each of these sections. Before troubleshooting, read the rest of this introduction. To begin troubleshooting, refer to “Troubleshooting to a Functional Section”...
Page 236: Assembly Test Points
General Troubleshooting Introduction Assembly Test Points The spectrum analyzer board assemblies contain four types of test points: post, pad, extended component lead, and test jack. Figure 7-1 on page 318 illustrates each type of test point as seen on both block diagrams and circuit boards.
Page 237 General Troubleshooting Introduction Figure 7-1 Assembly Test Points Figure 7-4 on page 321 shows the pin conﬁguration for the 80 pin, W60 cable that is found on EC-series instruments. The numbering of the pins is identical on the A2 Controller board and the A17 Display Driver board.
Page 238 General Troubleshooting Introduction Figure 7-2 Ribbon Cable Connections (1 of 3) Chapter 7...
Page 239 General Troubleshooting Introduction Figure 7-3 Ribbon Cable Connections (2 of 3) Chapter 7...
Page 240 General Troubleshooting Introduction Figure 7-4 Ribbon Cable Connections (3 of 3) Figure 7-4 shows A2J8 connections on 8560 EC-Series Instruments. Lines 2 − 5 and 42 − 44 supply +5V to the two LCD backlights. Lines 1 and 41 supply +5V to the A17A1 Inverter board.
Page 241: Service Cal Data Softkey Menus
General Troubleshooting Introduction Service Cal Data Softkey Menus The jumper on A2J12 is shipped from the factory in the WR PROT (write protect) position (jumper on pins 2 and 3). When the jumper is set to the WR ENA (write enable) position (jumper on pins 1 and 2), an additional service cal data menu is displayed under Figure 7-5 on page 323...
Page 242 General Troubleshooting Introduction Figure 7-5 Service Cal Data Menu Chapter 7...
Page 243: Troubleshooting To A Functional Section
General Troubleshooting Troubleshooting to a Functional Section Troubleshooting to a Functional Section 1. Refer to Table 7-1 on page 325 for the location of troubleshooting information. 2. If error messages are displayed, refer to "Error Messages" in this chapter. You will ﬁnd both error descriptions and troubleshooting information.
Page 244 General Troubleshooting Troubleshooting to a Functional Section Table 7-1 Location of Assembly Troubleshooting Text Instrument Assembly Location of Troubleshooting Text A1A1 keyboard Chapter 8 ADC/Interface Section A1A2 RPG Chapter 8 ADC/Interface Section A2 controller Chapter 10 Controller Section A3 interface Chapter 8 ADC/Interface Section Chapter 9 IF Section A4 log ampliﬁer/cal oscillator...
Page 245: Error Messages
General Troubleshooting Error Messages Error Messages The spectrum analyzer displays error messages in the lower right-hand corner of the display. A number, or error code, is associated with each error message. These error messages alert the user to errors in spectrum analyzer function or use.
Page 246: Viewing Multiple Messages
General Troubleshooting Error Messages Viewing Multiple Messages Although multiple errors may exist, the spectrum analyzer displays only one error message at a time. To view any additional messages, do the following: 1. Press RECALL MORE 1 OF 2 2. Press .
Page 247 General Troubleshooting Error Messages 109 CtrlFail Spectrum analyzer unable to take control of the bus. 110 NOT CTRL Spectrum analyzer is not system controller. 111 # ARGMTS Command does not have enough arguments. 112 ??CMD?? Unrecognized command. 113 FREQ NO! Command cannot have frequency units. 114 TIME NO! Command cannot have time units.
Page 248: Adc Errors (200 To 299)
General Troubleshooting Error Messages 141 BAD ARG Argument can only be used with FDIAG command. 142 BAD ARG Query expected for FDIAG command. 143 NO PRESL No preselector hardware to use command with. 144 COUPL?? Invalid COUPLING argument, expected AC or DC. ADC Errors (200 to 299) These errors are directly related to the ADC/interface section.
Page 249: Lo And Rf Hardware/Firmware Failures (300 To 399)
General Troubleshooting Error Messages 207 FADC CAL Slope derivation failed during FADC log expand offset calibration. This error applies only to EC-series analyzers and E-series analyzers with fast ADC (Option 007). 250 OUTOF RG ADC input is outside of ADC range. Microprocessor not receiving interrupt from ADC.
Page 250 General Troubleshooting Error Messages YTO Loop Error (331) This error rarely occurs but is usually indicative of a digital hardware failure. 331 FREQ ACC Invalid YTO frequency. Firmware attempted to set the YTO to a frequency outside the range of the YTO (2.95 to 6.8107 GHz).
Page 251 General Troubleshooting Error Messages LOMA (Local Oscillator Multiplier/Ampliﬁer) Leveling Loop Errors (338 to 340) These errors are generated when one of the LOMA (local oscillator multiplier/ampliﬁer) loops is unlevelled. These errors only apply to the hardware in an 8564E/EC or 8565E/EC spectrum analyzer. 338 LOMA AGC The LOMA main loop AGC is unleveled.
Page 252 General Troubleshooting Error Messages Sampling Oscillator (355) This error indicates an unlocked sampling oscillator during the local oscillator (LO) alignment routine. This error only applies to the hardware in an 8560 E-series or EC-series spectrum analyzer. 355 SMP CAL Sampler unlock condition during calibration routine. This error remains until a successful recalibration is performed.
Page 253: Automatic If Errors (400 To 599)
General Troubleshooting Error Messages 360 SPAC CAL The start bucket correction is out of range. This error indicates a possible failure of the sweep generator on the A14 frequency control assembly. Refer to “Sweep Generator Circuit,” Chapter 11 , “Synthesizer Section.”...
Page 254 General Troubleshooting Error Messages 2. Press to turn the spectrum analyzer on and LINE observe the lower right-hand corner of the display for 10 seconds. 3. If ERR 581 or ERR 582 appears, the fault is most likely caused by the cal oscillator. Refer to errors 581 and 582.
Page 255 General Troubleshooting Error Messages 412 RBW 10K Unable to adjust 10 kHz resolution bandwidth in fourth crystal pole. 413 RBW 10K Unable to adjust 10 kHz resolution bandwidth in ﬁrst crystal pole. 414 RBW 10K Unable to adjust 10 kHz resolution bandwidth in second crystal pole.
Page 256 General Troubleshooting Error Messages Unable to adjust 1 kHz resolution bandwidth. ADC 431 RBW 1K handshake. Unable to adjust 3 kHz resolution bandwidth. ADC 432 RBW 3K handshake. 433 RBW 10K Unable to adjust 10 kHz resolution bandwidth. ADC handshake. 434 RBW 300 300 Hz resolution bandwidth amplitude low in ﬁrst crystal pole.
Page 257 General Troubleshooting Error Messages 451 IF SYSTM IF hardware failure. Check other error messages. 452 IF SYSTM IF hardware failure. Check other error messages. Unable to adjust step gain ampliﬁers. Check other 454 AMPL errors. Unable to adjust ﬁne attenuator of the step gain 455 AMPL ampliﬁers.
Page 258 General Troubleshooting Error Messages 477 RBW 300K Unable to adjust 300 kHz resolution bandwidth in second LC pole. Unable to adjust 1 MHz resolution bandwidth in second 478 RBW 1M LC pole. 483 RBW 10K Unable to adjust 10 kHz resolution bandwidth. Unable to adjust 3 kHz resolution bandwidth.
Page 259 General Troubleshooting Error Messages 3. If a 10 MHz signal (approximately 0 dBm) is not present, suspect the A15 RF assembly, the A21 OCXO, or the A15 assembly TCXO (Option 103). If the 10 MHz reference is present, continue with step 4. 4.
Page 260 General Troubleshooting Error Messages 508 AMPL 30K Unable to adjust amplitude of 30 kHz resolution bandwidth. Insufﬁcient gain during LC bandwidth calibration. 509 AMPL .1M Unable to adjust amplitude of 100 kHz resolution bandwidth. Insufﬁcient gain during LC bandwidth calibration. 510 AMPL .3M Unable to adjust amplitude of 300 kHz resolution bandwidth.
Page 261 General Troubleshooting Error Messages 525 RBW 10K Unable to adjust symmetry of 10 kHz resolution bandwidth in fourth crystal pole. 526 RBW <300 ADC timeout during IF ADJUST of <300 Hz resolution bandwidth. 527 RBW <300 Step gain correction failed for <300 Hz resolution bandwidth.
Page 262 General Troubleshooting Error Messages 540 RBW <300 Unable to ﬁnd CW CAL OSC signal during VCXO pretune at power-up with resolution bandwidths less than 300 Hz. 550 ID CALOSC CAL Oscillator ID. Indicates incompatible hardware. Cal Osc not expected 551 ID LOGBD LOG Board ID. Indicates incompatible hardware. Log board not expected.
Page 263 General Troubleshooting Error Messages 573 LOG AMPL Unable to adjust amplitude of log scale. Check video offset circuitry. 574 LOG AMPL Unable to adjust amplitude of log scale. Check video offset circuitry. 575 LOG AMPL Unable to adjust amplitude of log scale. Check video offset circuitry.
Page 264 General Troubleshooting Error Messages 5. If the delta MKR frequency is between 90 kHz and 110 kHz, the 100 kHz resolution bandwidth is working properly. If the frequency is outside these limits, read the following information on the A4 cal oscillator sweep generator.
Page 265: System Errors (600 To 651)
General Troubleshooting Error Messages 593 LOG TUNE Limiter calibration tune error from DC logger calibration. 594 LOG OFST Attenuator calibration offset error from DC logger calibration. 595 LOG ATTN Attenuator calibration absolute error from DC logger calibration. 596 LOG FID Fidelity error from DC logger calibration. 597 LOG OFST Fidelity offset error from DC logger calibration.
Page 266 General Troubleshooting Error Messages 2. On the spectrum analyzer, press CAL MORE 1 OF 2 , and SERVICE CAL DATA FLATNESS FLATNESS DATA Enter a value of 130. Press PREV MENU STORE , and DATA DISPLAY 3. Press , enter an intensity value of 90, and INTEN press STORE INTEN...
Page 267: Battery Problem (718)
General Troubleshooting Error Messages 710 ROM U311 Checksum error of program ROM A2U311. RAM Check Errors (711 to 716) The instrument power-on diagnostics check the program RAM. This includes the two RAMs used for STATE storage. If any STATE information is found to be invalid, all data in that RAM is destroyed.
Page 268: Ram Check Error (721)
General Troubleshooting Error Messages RAM Check Error (721) 721 AMPC RAM Checksum error of the ampcor function correction data. System Errors (750 to 759) These errors often require troubleshooting the A2 controller and A3 interface assemblies. Hardware/ﬁrmware interaction, zero divide. Check for 750 SYSTEM other errors.
Page 269: User-Generated Errors (900 To 999)
General Troubleshooting Error Messages User-Generated Errors (900 to 999) These error codes indicate user-generated errors. 900 TG UNLVL Tracking generator output is unleveled. 901 TGFrqLmt Tracking generator output unleveled because START FREQ is set below tracking generator frequency limit (300 kHz). 902 BAD NORM The state of the stored trace does not match the current state of the spectrum analyzer.
Page 270: Block Diagram Description
General Troubleshooting Block Diagram Description Block Diagram Description The spectrum analyzer is comprised of the six main sections listed below. See Figure 7-6 on page 352. The following descriptions apply to the simpliﬁed block diagram and overall block diagram located at the end of this chapter.
Page 271 General Troubleshooting Block Diagram Description Figure 7-6 Functional Sections Chapter 7...
Page 272: Rf Section
General Troubleshooting Block Diagram Description RF Section The RF section of the 8564EC and 8565EC includes the following assemblies: A7 LOMA (LO multiplier/ampliﬁer) A8 low band mixer A9 input attenuator A10 RYTHM (YIG-tuned ﬁlter/mixer) A11 YTO (YIG-tuned oscillator) A12 SBTX (switched barium-tuned mixer)
Page 273 General Troubleshooting Block Diagram Description A7 LOMA The A7 LOMA (LO multiplier/ampliﬁer) levels the output of the A11 YTO and distributes the YTO fundamental frequency to the front panel 1ST LO OUTPUT, A8 low band mixer, A10 RYTHM, and A15U100 sampler. It also doubles the YTO frequency and levels this signal for use by the A12 SBTX.
Page 274 General Troubleshooting Block Diagram Description Fine frequency control originates from a preselector peak DAC located on the A3 interface assembly. Values for the preselector peak DAC are interpolated approximately every 17 MHz based upon data taken during the frequency response (ﬂatness) adjustment. The preselector bandwidth varies from greater than 30 MHz, at 2.75 GHz, to greater than 60 MHz, at 26.5 GHz.
Page 275 General Troubleshooting Block Diagram Description A13 Second Converter The A13 second converter down-converts the 3.9107 GHz 1st IF (low-band and millimeter band) to a 310.7 MHz 2nd IF. In the microwave band, it passes the 310.7 MHz 1st IF from the A10 YIG-tuned ﬁlter/mixer to the A15 RF assembly.
Page 276: Synthesizer Section
General Troubleshooting Block Diagram Description Synthesizer Section The 1st LO is phase-locked to the 10 MHz standard internal to the instrument by four PLLs. See Figure 7-7 on page 358. The reference PLL supplies reference frequencies for the instrument. The three remaining PLLs tune and phase-lock the LO through its frequency range.
Page 277 General Troubleshooting Block Diagram Description YTO PLL (A7, A11, part of A14, part of A15) The YTO PLL produces the 1st LO of the instrument (3.0 to 6.81 GHz). The YTO output is mixed with a harmonic of the sampling oscillator in the sampler (A15A2), and the resulting frequency is phase-locked to the output of the fractional N PLL.
Page 278: If Section
General Troubleshooting Block Diagram Description Fractional N PLL (part of A14) The fractional N PLL produces an output of 60 MHz to 96 MHz. This PLL output serves as the reference frequency for the YTO PLL. A one-to-one relationship in frequency tracking exists between the fractional N PLL and the YTO.
Page 279: Adc/Interface Section
General Troubleshooting Block Diagram Description The cal oscillator output has three forms (all −35 dBm): • 10.7 MHz • 9.9 to 11.5 MHz in 100 kHz steps • Frequency sweeps from 20 kHz to 2 kHz centered at 10.7 MHz (lasting 5 to 60 ms respectively) The purpose of these signals is: •...
Page 280 General Troubleshooting Block Diagram Description The spectrum analyzer can digitize signals with either the main ADC on the A3 interface assembly, or the optional A16 fast ADC (Option 007). The main ADC is used for digitizing video signals (when the sweep time is ≥30 ms) and various other signals such as PLL error voltages.
Page 281: Controller Section
GPIB assembly. The battery on the rear panel provides battery backup for state and trace storage. In 8564EC and 8565EC instruments the A2 contains the CPU, RAM, ROM, the display ASM, Fast ADC circuitry, GPIB interface, control, frequency counter, display RAM, option module interface, and EEROM.
Page 282: Display/Power Supply Section
General Troubleshooting Block Diagram Description Display ASM Much of the miscellaneous digital control is performed by A2U100. U100 functions as the display ASM (algorithmic state machine) and character ROM. It also converts the 16-bit CPU data bus to an 8-bit data bus for the rest of the spectrum analyzer. Display/Power Supply Section A6 Power Supply The A6 power supply is a switching supply operating at 40 kHz...
Page 283 General Troubleshooting Block Diagram Description Chapter 7...
Page 287: Adc/Interface Section
ADC/Interface Section...
Page 288 ADC/Interface Section Introduction Introduction The ADC/Interface section includes the A1A1 keyboard, A1A2 RPG (rotary pulse generator), A3 interface, assemblies. Table 8-1 on page 379 lists signal versus pin numbers for control cable W2. Figure 8-1 on page 380 illustrates the location of the test connectors on A3.
Page 289 ADC/Interface Section Introduction 16-Bit Post-Trigger Counter ........page 420 15-Bit (32 K) Circular Address Counter ....page 420 Video Trigger Comparator ........page 421 Table 8-1 W2 Control Cable Connections (1 of 2) Signal A3J2 A4J2 A5J2 A14J2 A15J2 (pins) (pins) (pins) (pins)
Page 290 ADC/Interface Section Introduction Table 8-2 Table 8-1. W2 Control Cable Connections (2 of 2) Signal A3J2 A4J2 A5J2 A14J2 A15J2 (pins) (pins) (pins) (pins) (pins) A GND RF GAIN — — — LO3 ERR — — — A GND LVFC_ENABLE 39* —...
Page 291 ADC/Interface Section Introduction Figure 8-2 A3 Test Connector Pin Locations Chapter 8...
Page 292: Keyboard/Rpg Problems
ADC/Interface Section Keyboard/RPG Problems Keyboard/RPG Problems Keyboard Interface Refer to function block G of A3 Interface Assembly Schematic Diagram (sheet 3 of 6) in the 8560 E-Series Spectrum Analyzer Component Level Information. A pressed key results in a low on a keyboard sense line (LKSNS0 through LKSNS7).
Page 293: Rpg Interface
ADC/Interface Section Keyboard/RPG Problems 4. Monitor A3U607 pin 8 with a logic probe. A TTL high should be present when any key is held down. Monitor this point while pressing each key in succession. 5. Check that the LKSCN lines (outputs of A3J602 pins 1 through 6) read a TTL low with no key pressed.
Page 294 ADC/Interface Section Keyboard/RPG Problems 5. Press to turn spectrum analyzer off and disconnect A1A1W1 LINE from A3J602. Jumper A3U608 pin 12 (RPG_COUNT1) to U608 pin 14 (+5 Vdc). Jumper U401 pin 2 (RPG_COUNT1) to U511 pin 11 (HDPKD_CLK). This provides a 7.8 kHz square wave to the RPG_COUNT input of the RPG Interface.
Page 295: Triggering Or Video Gating Problems
ADC/Interface Section Triggering or Video Gating Problems Triggering or Video Gating Problems Refer to function block H of A3 Interface Assembly Schematic Diagram (sheet 3 of 6) in the 8560 E-Series Spectrum Analyzer Component Level Information. The 1 MHz ADC clock provides synchronization in FREE RUN and SINGLE triggering.
Page 296 ADC/Interface Section Triggering or Video Gating Problems 7. Check that the voltage displayed on the DVM changes by 1 V for each step of the VIDEO TRIG LEVEL. 8. If the voltage changes incorrectly, proceed as follows: a. Check the −10 Vdc reference (A3U409 pin 4). b.
Page 297 ADC/Interface Section Triggering or Video Gating Problems e. Set the pulse/function generator to NORMAL mode with a duty cycle of 50% and a frequency of 10 Hz. f. Press the following keys on the oscilloscope: CLEAR DISPLAY ........highlight off frame axes grid grid ........
Page 298: Preselector Peaking Control (Real Time Dac)
ADC/Interface Section Preselector Peaking Control (Real Time DAC) Preselector Peaking Control (Real Time DAC) Refer to function block H of A3 Interface Assembly Schematic Diagram (sheet 3 of 6) in the 8560 E-Series Spectrum Analyzer Component Level Information. The spectrum analyzer uses a real-time DAC (R/T DAC1) to peak the preselector.
Page 299: Flatness Control (Rf Gain Dacs)
ADC/Interface Section Flatness Control (RF Gain DACs) Flatness Control (RF Gain DACs) Refer to function block M of A3 Interface Assembly Schematic Diagram (sheet 4 of 6) in the 8560 E-Series Spectrum Analyzer Component Level Information. RF Gain DACs control the A15 assembly ﬂatness compensation ampliﬁers.
Page 300 ADC/Interface Section Flatness Control (RF Gain DACs) 8. Place the WR PROT/ WR ENA jumper on the A2 controller assembly in the WR PROT position. Press PRESET Chapter 8...
Page 301: A3 Assembly Video Circuits
ADC/Interface Section A3 Assembly Video Circuits A3 Assembly Video Circuits Voltages from A3J101 to the Variable Gain Ampliﬁer on A3 correspond (approximately) to on-screen signal levels. (One volt corresponds to the top of the screen and zero volts corresponds to the bottom of the screen.) This is true for both log and linear settings except when the spectrum analyzer is in 1 dB/div or 2 dB/div.
Page 302 ADC/Interface Section A3 Assembly Video Circuits 13.Press until OFF is underlined. Monitor IF ADJ ON OFF A3TP9 with an oscilloscope. If the voltage is not approximately +1 Vdc, troubleshoot the Log Ampliﬁer on A4. (Refer to the IF troubleshooting procedure in Chapter 9 , “IF Section.”) 14.To conﬁrm proper video input to the video circuit, set the spectrum...
Page 303: Log Offset/Log Expand
ADC/Interface Section A3 Assembly Video Circuits Log Offset/Log Expand Refer to function block X of A3 Interface Assembly Schematic Diagram (sheet 5 of 6) in the 8560 E-Series Spectrum Analyzer Component Level Information. The log scales are modiﬁed using a combination of ampliﬁcation and digital trace manipulation.
Page 304: Video Mux
ADC/Interface Section A3 Assembly Video Circuits 10.The ratio of voltage recorded in step 6 to the voltage recorded in step 9 should be 5 ±3%. If the ratio is not 5, troubleshoot the A3 Interface assembly. 11.Reconnect W26 to A3J101. Video MUX Refer to function block U of A3 Interface Assembly Schematic Diagram (sheet 5 of 6) in the...
Page 305: Video Filter
ADC/Interface Section A3 Assembly Video Circuits 9. The Video MUX will appear faulty if A3CR109 is shorted or leaky. Diode A3CR109 clamps the voltage at A3TP14 to −0.4 V when in log expand with less than 0.8 V at J101. To conﬁrm this failure, lift the cathode of diode A3CR109 and perform steps 1 through 7 again.
Page 306: Video Filter Buffer Ampliﬁer
ADC/Interface Section A3 Assembly Video Circuits 6. If the output of latch A3U102 is not correct, trigger an oscilloscope on LLOG_STB (U102 pin 9) and monitor U102 pin 1 and other latch inputs while changing the video bandwidth. 7. If the inputs are incorrect, troubleshoot the analog bus. Correct inputs with bad outputs indicate a faulty U102.
Page 307: Positive/Negative Peak Detectors
ADC/Interface Section A3 Assembly Video Circuits Current source U307C provides twice the current of Q316. Resistor R145 and current source U307D shift the dc level. Resistor R260 terminates the peak detector inputs in 500 ohms. The unterminated gain is 1.1. Diode CR114 prevents latchup during positive overdrive conditions while CR113 protects Q318 during overdrive.
Page 308: Peak Detector Reset
ADC/Interface Section A3 Assembly Video Circuits d. Select mode. The noise should be about DETECTOR NEG PEAK one-third of a division peak-to-peak. The noise should also be no lower than the bottom of the noise in NORMAL mode. e. Select mode.
Page 309: Rosenfell Detector
The HROSENFELL signal is valid only when the NORMAL (rosenfell) detector mode is selected. 1. Remove anything connected to the 8564EC 8565EC front-panel INPUT 50Ω connector. Press...
Page 310: Adc Mux
ADC/Interface Section A3 Assembly Video Circuits 3. Check A3U423 pin 4 for two low-going 3.3 µs pulses 40 µs apart occurring every 130 µs. 4. Check that HROSENFELL (A3U610 pin 6) has two pulses spaced approximately 40 µs apart and then a third pulse 60 µs from the second pulse.
Page 311 ADC/Interface Section A3 Assembly Video Circuits 2. Refer to Table 8-8 and check for correct logic levels at A3U108 pins 1, 15, and 16. Check for proper output signals at TP6. If the select lines are not changing, suspect the ADC ASM or the VGA/ADC MUX Control.
Page 312: Variable Gain Ampliﬁer (Vga)
ADC/Interface Section A3 Assembly Video Circuits 9. Set the spectrum anal"ADC Control Signals" in this chapter.yzer to the following settings: Sweep time ..............100 ms Span ................. 100 MHz 10.Press and check for the presence of the CAL OSC IF ADJ ON TUNE signal by monitoring A3J401 pin 25 with an oscilloscope.
Page 313: A3 Assembly Adc Circuits
ADC/Interface Section A3 Assembly ADC Circuits A3 Assembly ADC Circuits The ADC consists of a 12-bit DAC, 12-bit successive approximation register (SAR), data multiplexers, and data latches. The ADC ASM (algorithmic state machine) controls the ADC. Eight inputs are controlled by the ADC MUX. These include a positive peak detector, negative peak detector, sampled video, scan ramp, YTO error voltage, FC MUX voltages, Cal Oscillator tune voltage, and offset lock error voltage.
Page 314: Adc Start/Stop Control
ADC/Interface Section A3 Assembly ADC Circuits 11.HBKT_PULSE is absent, refer to the information on troubleshooting the frequency counter in Chapter 10 , “Controller Section.” 12.Reconnect A3W1 to A2J2. ADC Start/Stop Control Refer to function block B of A3 Interface Assembly Schematic Diagram (sheet 2 of 6) in the 8560 E-Series Spectrum Analyzer Component Level Information.
Page 315: Adc Asm
ADC/Interface Section A3 Assembly ADC Circuits 10.Set the detector mode to NORMAL. 11.Check that A3U509 pin 9 has pulses every 130 µs and U509 pin 7 has pulses every 667 µs (although pulse widths may be changing). ADC ASM Refer to function block F of A3 Interface Assembly Schematic Diagram (sheet 2 of 6) in the 8560 E-Series Spectrum Analyzer Component Level Informatio...
Page 316: Ramp Counter
ADC/Interface Section A3 Assembly ADC Circuits 1. Set the spectrum analyzer controls as follows: Center frequency ..........300 MHz Span ................0 Hz Sweep time ..............60 s Detector mode ............SAMPLE 2. Trigger an oscilloscope on HSTART_ADC (U506 pin 15) and monitor the outputs of the SASM (U527 pins 18 and 19;...
Page 317: A3 Assembly Control Circuits
ADC/Interface Section A3 Assembly Control Circuits A3 Assembly Control Circuits A digital control problem will cause the following three steps to fail: 1. On the spectrum analyzer, press , 6, 0, and AMPLITUDE ATTEN MAN 2. A click should be heard after pressing dB in step 1, unless ATTEN was previously set to 60 dB.
Page 318: Analog Bus Timing
ADC/Interface Section A3 Assembly Control Circuits 11.Check that address lines A0 through A7 and data lines D0 through D7 are all TTL high. 12.If any address or data line is low, press to turn spectrum LINE analyzer off and disconnect the W2 control cable from A3J2. Press to turn spectrum analyzer on.
Page 319: Interface Strobe Select
ADC/Interface Section A3 Assembly Control Circuits 6. Press and set the controls as follows: PRESET Span ................. 0 Hz Trigger ..............SINGLE 7. Monitor A3U401 pin 3 (LR_STB) with an oscilloscope or logic probe. This is the strobe for the A15 RF assembly. 8.
Page 320 ADC/Interface Section A3 Assembly Control Circuits Table 8-9 Demultiplexer A3U410 Truth Table Selected Output Line Pin 15, LSCAN_KBD Pin 14, LDACU1 Pin 13, LDAC1 Pin 12, LDAC2 Pin 11, LDAC3 Pin 10 Pin 9, LTIMER Pin 7, LADC_REG1 Table 8-10 Demultiplexer A3U500 Truth Table Selected Output Line Pin 15, LSENSE_KBD...
Page 322 IF Section...
Page 323 IF Section Introduction Introduction The IF section contains the A4 log ampliﬁer/cal oscillator and the A5 IF assemblies. Figure 9-2 on page 431 illustrates the location of the A4 and A5 test connectors. Figure 9-7 on page 436 illustrates the level and paths through the IF section.
Page 324 IF Section Introduction Cal Oscillator Unlock at Beginning of IF Adjust ..page 470 Inadequate CAL OSC AMPTD Range ......page 471 page 472 300 Hz to 3 kHz Resolution Bandwidth Out of Speciﬁcation .. Low-Pass Filter ............. page 478 Sweep Generator ............
Page 325: Troubleshooting Using The Diagnostic Software
IF Section Troubleshooting Using the Diagnostic Software Troubleshooting Using the Diagnostic Software Whenever the software program says "Connect the 8566 to .…," just NOTE about any spectrum analyzer with GPIB will work. However, an 8566B or 8563E is recommended for speed of measurement. (The 8562A and 8560A-Series spectrum analyzers are much slower when using the diagnostics program.) For required hardware and instructions on how to load the...
Page 326: Troubleshooting The Cal Oscillator On A4 Using Diagnostic Software
Troubleshooting the Cal Oscillator on A4 Using Diagnostic Software 1. From the 8564E/8565E adjustment/diagnostic software menu, select "CAL Oscillator Control." 2. Set the 8564EC or 8565EC to external trigger and press , and SGL SWP IF ADJ OFF 3. Using a second spectrum analyzer, look at the output of the cal oscillator at A4J8.
Page 327 IF Section Troubleshooting Using the Diagnostic Software 6. Select the 10 kHz sweep width in the software menu. The display on the second spectrum analyzer should be similar to that shown in Figure 9-4 on page 433. 7. Select the 4 kHz sweep width in the software menu. The display on the second spectrum analyzer should be similar to that shown in Figure 9-5 on page 434.
Page 328 IF Section Troubleshooting Using the Diagnostic Software Figure 9-3 CAL Oscillator Swept Output, 20 kHz Width Figure 9-4 CAL Oscillator Swept Output, 10 kHz Width Chapter 9...
Page 329 IF Section Troubleshooting Using the Diagnostic Software Figure 9-5 CAL Oscillator Swept Output, 4 kHz Width Figure 9-6 CAL Oscillator Swept Output, 2 kHz Width Chapter 9...
Page 330: Troubleshooting A5 Using Diagnostic Software
IF Section Troubleshooting Using the Diagnostic Software Troubleshooting A5 Using Diagnostic Software The IF diagnostics in the software include: DC probe (using the TAM) Gain checks LC frequency checks Xtal frequency checks DC Probe Using the up/down arrow, select "DC probe" in the IF diagnostics menu. Connect the TAM (Test and Adjustment Module) and use the dc probe as directed by the diagnostic software program.
Page 331 IF Section Troubleshooting Using the Diagnostic Software Xtal Frequency Checks Using the up/down arrow, select "Xtal frequency checks" in the IF diagnostics menu. An 3335A synthesizer/level generator is used as a stimulus and a spectrum analyzer is used to measure the response. The symmetry adjustment range and the bandwidth adjustment range are measured for each pole.
Page 332: Automatic If Adjustment
(ADC). The 8564EC or 8565EC spectrum analyzer turns the cal oscillator off during a sweep. When IF ADJ is ON, the 8564EC or 8565EC spectrum analyzer readjusts part of the IF circuitry during each retrace period to readjust the IF completely every 5 minutes.
Page 333: Parameters Adjusted
IF Section Automatic IF Adjustment Parameters Adjusted The following IF parameters are adjusted in the sequence listed: 1. Amplitude a. Video Offsets: analog (using log ampliﬁer video offset DAC) and digital (applying stored constant to all readings) 1. Linear Scale Offset 2.
Page 334: Requirements
IF Section Automatic IF Adjustment f. Gain of all resolution bandwidth relative to the 300 kHz RES BW 3. Crystal Bandwidths a. The cal oscillator sweep rate is measured against the 100 kHz resolution bandwidth ﬁlter skirt. This result is used in compensating the sweeps used for adjusting the crystal bandwidths.
Page 335 IF Section Automatic IF Adjustment The references against which the Automatic IF Adjustment routine aligns are: • 10 MHz reference (A15) • Linear scale ﬁdelity, especially the 10 dB gain stage in A4 linear ampliﬁer block • 15 dB reference attenuator (A5) •...
Page 336: Performance Test Failures
If the signal deviates from the reference level, troubleshoot the video offset circuitry on the A4 assembly. 6. Repeat steps 1 through 5 with the 8564EC or 8565EC spectrum analyzer set to linear. Chapter 9...
Page 337: Scale Fidelity Performance Test
IF Section Performance Test Failures Scale Fidelity Performance Test Failure of this performance test indicates a possible problem with the A4 assembly: • If the Linear, 5 dB/div, or 10 dB/div scales are out of speciﬁcation, the fault is most likely on the log ampliﬁer assembly (P/O A4). •...
Page 338: Log Ampliﬁer (P/O A4 Assembly)
. Set the digital multimeter to read dc volts IF ADJ OFF and connect the negative lead to the chassis of the 8564EC or 8565EC spectrum analyzer. 2. Remove W27 from A4J3 and inject a 10.7 MHz signal of +10 dBm into A4J3.
Page 339: Linear Ampliﬁers
(become less negative) at a rate of 30 mV for each 10 dB decrease in input power. Troubleshoot the A4 assembly if the signal does not decrease properly. 8. Set the 8564EC or 8565EC spectrum analyzer resolution bandwidth to 100 kHz to place the wide/narrow ﬁlter in narrow mode.
Page 340 A4CR201 and A4CR210 with the control line LIN_20B. The gain of A4U201E can be increased by either 10 dB or 20 dB with the control lines LIN_10 or LIN_20A respectively. The gain can be selected by setting the reference level of the 8564EC or 8565EC spectrum analyzer. Table 9-2...
Page 341 Total gain can be measured by injecting the speciﬁed power into A4J3 and measuring the total gain provided by A4U201C and A4U201E. The following procedure provides a means of troubleshooting the linear ampliﬁers: 1. On the 8564EC or 8565EC spectrum analyzer, press PRESET SPAN ZERO, SPAN...
Page 342: Video Offset
4) in the 8560 E-Series Spectrum Analyzer Component Level Information. The circuit provides a programmable video offset, with a step size of 5 mV, from −300 mV to +900 mV. 1. On the 8564EC or 8565EC spectrum analyzer, press PRESET , −50 dBm, SPAN...
Page 343: Frequency Counter Prescaler/Conditioner
IF Section Log Ampliﬁer (P/O A4 Assembly) 4. Set the oscilloscope controls as follows: Amplitude scale ........... 200 mV/div Offset ................ +400 mV Coupling ................dc Sweep time ............50 µs/division 5. The oscilloscope should display a 4.8 kHz sine wave. 6.
Page 344: 4.8 Khz If Filters
5. Connect the VIDEO OUTPUT (rear panel) of the 8564EC or 8565EC spectrum analyzer through a 20 dB attenuator and dc block to the input of the 8566A/B. Set the sweep time of the 8566A/B to 10 seconds.
Page 345: 10.7 Mhz If Filters
10.7 MHz signal at −50 dBm and connect it to A5J3. 3. Fine tune the frequency of the signal generator to center the signal on the 8564EC or 8565EC spectrum analyzer display. Set the signal generator to sweep one 2 kHz span about this center frequency.
Page 346: 10.6952 Mhz Vcxo
5. Set the 8566A/B to 4.8 kHz center frequency and 2 kHz span. 6. Connect the VIDEO OUTPUT (rear panel) of the 8564EC or 8565EC spectrum analyzer through a 20 dB attenuator and dc block to the input of the 8566A/B.
Page 347: Lo Switch
IF Section Log Ampliﬁer (P/O A4 Assembly) The input switch switches between log and linear modes. In addition it contains a 20 dB attenuator which is used only in digital resolution bandwidth settings. CR207, CR208, and CR209 form the input switch. CR205 and CR206 switch in R234 when in linear mode to maintain a constant impedance at J3.
Page 348: Log Offset/Gain Compensation
IF Section Log Ampliﬁer (P/O A4 Assembly) Limiter Refer to function block G of A4 log ampliﬁer schematic diagram (sheet 2 of 4) in the 8560 E-Series Spectrum Analyzer Component Level Information. The limiter consists of 7 identical 20 dB gain stages. A "log narrow ﬁlter"...
Page 349: Video Mux
The gain of A4U508 is nominally 6.8, measuring from pin 3 to pin 8. To check the log offset/gain compensation circuits inject a +10 dBm signal into J3 with the 8564EC or 8565EC spectrum analyzer set to log mode. Measure A4U503 pin 3, V...
Page 350: A5 If Assembly
The step-gain ampliﬁers consist of the ﬁrst step-gain stage, second step-gain stage, and third step-gain stage. These ampliﬁers provide gain when the 8564EC or 8565EC spectrum analyzer reference level is changed. The ampliﬁers also provide gain range to compensate for variations in the IF ﬁlter gains, which change with bandwidth and environmental conditions, and band conversion loss in the front end.
Page 351: If Signature
DACs damaged by shorting these voltages might not fail until several weeks after the shorting takes place. Do not short power supply voltages to ground. The 8564EC or 8565EC spectrum analyzer power supply current limiting cannot protect the resistors in series with the power supply.
Page 352 Trigger ............... Single 8. On the 8566A/B, press , (trace A blank) to set detector to SHIFT SAMPLE mode. 9. On the 8564EC or 8565EC spectrum analyzer, press PRESET and set the controls as follows: Center frequency ........... 300MHz Span ................5MHz 10.On the 8564EC or 8565EC spectrum analyzer, press...
Page 353 Figure 9-13 on page 461 illustrate detailed IF signatures of a properly operating 8564EC or 8565EC spectrum analyzer. It may be necessary to experiment with different time intervals between initiating the sweep on the 8566A/B and initiating the current IF state adjustment on the 8564EC or 8565EC spectrum analyzer to obtain the waveforms shown.
Page 354 IF Section A5 IF Assembly Figure 9-9 Detailed IF Adjust Signature (1) Figure 9-10 Detailed IF Adjust Signature (2) Chapter 9...
Page 355 IF Section A5 IF Assembly Figure 9-11 Detailed IF Adjust Signature (3) Figure 9-12 Detailed IF Adjust Signature (4) Chapter 9...
Page 356 IF Section A5 IF Assembly Figure 9-13 Detailed IF Adjust Signature (5) Chapter 9...
Page 357: Common If Signature Problems
IF Section A5 IF Assembly Common IF Signature Problems Region A of Figure 9-9, “Detailed IF Adjust Signature (1)” noisy: Suspect the ﬁrst LC pole. Region B of Figure 9-9 on page 459 is ﬂat: Suspect the third step-gain stage, the ﬁne attenuator, or the fourth LC-pole output ampliﬁer.
Page 358 IF Section A5 IF Assembly Figure 9-14 Noisy Signature Figure 9-15 Noise with Correct Shape Chapter 9...
Page 359 IF Section A5 IF Assembly Figure 9-16 Region B Amplitude Variation Figure 9-17 Region B Amplitude Offset Chapter 9...
Page 360: Mhz Resolution Bandwidth Problems
Span ............... 500 kHz Center frequency ..........300 MHz 2. On the 8564EC or 8565EC spectrum analyzer, connect the 300 MHz CAL OUTPUT to the INPUT 50Ω. 3. If the trace ﬂatness is not within 2.5 dB, a failure probably exists.
Page 361: 30 Khz Resolution Bandwidth Problems
IF Section A5 IF Assembly Figure 9-19 Faulty LC Pole 30 kHz Resolution Bandwidth Problems Shape factor too high: Shape factor is the ratio of the 60 dB bandwidth to the 3 dB bandwidth. Shape factor should be less than 15:1. If one of the LC poles malfunctions, the shape factor may be the only indication of the failure.
Page 362: Khz And 10 Khz Resolution Bandwidth Problems
Asymmetric Filter Response: Check the crystal symmetry control with the following steps: 1. Press PRESET 2. Set the 8564EC or 8565EC spectrum analyzer controls as follows: Resolution bandwidth ..........3 kHz Span ................100 kHz Center frequency ............. 300 MHz 3.
Page 363: Step Gains
Refer to function blocks B, H, and I of A5 IF ﬁlter schematic diagram (sheets 1 of 3 and2 of 3) in the 8560 E-Series Spectrum Analyzer Component Level Information. 1. On the 8564EC or 8565EC spectrum analyzer, press PRESET , and 1...
Page 364: Cal Oscillator (P/O A4 Assembly)
IF Section Cal Oscillator (P/O A4 Assembly) Cal Oscillator (P/O A4 Assembly) The cal oscillator on the A4 assembly supplies the stimulus signal for automatic IF adjustments. Normally, the oscillator operates only during retrace (for a few milliseconds) to adjust part of the IF. (All IF parameters are to be readjusted about every 5 minutes.) With continuous IF adjust ON, a group of IF parameters are adjusted during each retrace period (non-disruptive).
Page 365: Cal Oscillator Unlock At Beginning Of If Adjust
ERR 565), the cal oscillator is unable to phase-lock. Expect to see the ERR 499 message for only about 1 second. 2. If the 8564EC or 8565EC spectrum analyzer registers an unlocked cal oscillator, continue with step 3 to verify the presence of externally supplied signals.
Page 366: Inadequate Cal Osc Amptd Range
7. Troubleshoot the ALC loop on this assembly using the following steps: a. Connect a positive DVM probe to A4J9 pin 4. b. On the 8564EC or 8565EC spectrum analyzer, press c. Press . Observe the DVM reading between the...
Page 367: 300 Hz To 3 Khz Resolution Bandwidth Out Of Speciﬁcation
6. Connect the output (type N connector) of the active probe to the input of the 8566A/B spectrum analyzer. 7. Connect the probe power cable to the 8564EC or 8565EC spectrum analyzer front panel PROBE POWER connector (you may need to use a probe power extension cable, 10131B).
Page 368 Center frequency ..........10.710 MHz Resolution bandwidth ..........10 kHz Video bandwidth ............1 kHz Sweep time ..............200 ms 16.On the 8564EC or 8565EC spectrum analyzer, press . When the message IF ADJUST STATUS:1 kHz RBW FULL IF ADJ appears, press on the 8566A/B.
Page 369 IF Section Cal Oscillator (P/O A4 Assembly) Figure 9-21 Output Waveform, 10 kHz Resolution Bandwidth Chapter 9...
Page 370 IF Section Cal Oscillator (P/O A4 Assembly) Figure 9-22 Output Waveform, 3 kHz Resolution Bandwidth Chapter 9...
Page 371 IF Section Cal Oscillator (P/O A4 Assembly) Figure 9-23 Output Waveform, 1 kHz Resolution Bandwidth Chapter 9...
Page 372 IF Section Cal Oscillator (P/O A4 Assembly) Figure 9-24 Output Waveform, 300 Hz Resolution Bandwidth Chapter 9...
Page 373: Low-Pass Filter
(sheet 4 of 4) in the 8560 E-Series Spectrum Analyzer Component Level Information. 1. Connect a DVM positive probe to A4J9 pin 4. 2. On the 8564EC or 8565EC spectrum analyzer, press 3. Press . Observe the DVM reading between the...
Page 374: Sweep Generator
Frequency ..............100 MHz Amplitude ..............−6 dBm Modulation type ............80% AM Modulation frequency ..........400 Hz 2. Set the 8564EC or 8565EC spectrum analyzer controls as follows: Center frequency ............100 MHz Span ................... 0 Hz Sweep time ............... 50 ms Reference level ..............
Page 375 IF Section Cal Oscillator (P/O A4 Assembly) 5. Vary the volume and listen for the variation in speaker output level. Clipping is normal at the highest volume levels. 6. If the audio is not working correctly monitor the signal at A4U704 pin 3 with an oscilloscope.
Page 379 Controller Section...
Page 380 Controller Section Introduction Introduction The controller section includes the A2 controller assembly, A19 GPIB assembly, and BT1 battery. The presence of a display (graticule and annotation) veriﬁes that most of A2 controller assembly is operating properly. Page Frequency Count Marker Problems .........page 503 Frequency Counter ............page 505...
Page 381 Controller Section Introduction Figure 10-1 A2 Test Connectors Figure 10-2 A2 Test Connector Pin Locations Chapter 10...
Page 382: Frequency-Count Marker Problems (8564Ec And 8565Ec)
Controller Section Frequency-Count Marker Problems Frequency-Count Marker Problems The FREQ COUNT function works by dividing the 10.7 MHz IF signal by two (prescaling) and counting the divided-down signal using the frequency counter on the A2 controller assembly . The prescaler is on the A4 Log ampliﬁer/cal oscillator assembly .
Page 383: Frequency Counter (8564Ec And 8565Ec)
Controller Section Frequency Counter Frequency Counter The frequency counter counts the frequency of the last IF and provides accurate timing signals for digital zero-spans. The circuit also provides timing signals to the ADC (analog to digital converter) on the A3 interface assembly.
Page 384: Frequency Counter (8564E And 8565E)
Controller Section Frequency Counter Table 10-1 Gate Times Counter Res Gate Time* A2TP16 A2TP15 (U15 pin 20 low state) 10 Hz 200 ms 2 MHz 4.18 kHz 100 Hz 20 ms 2 MHz 418 Hz 1 kHz 2 ms 2 MHz 41.8 Hz 10 kHz 2 ms...
Page 385: Video Input Scaling Ampliﬁers And Limiter (8564Ec And 8565Ec)
Controller Section Video Input Scaling Ampliﬁers and Limiter Video Input Scaling Ampliﬁers and Limiter The video input scaling ampliﬁers help provide scaling (10 dB/div, 5 dB/div, 2 dB/div, or 1 dB/div) and buffer the ﬂash video output. When the GAINX2 control line is low, switch U44D is open and switch U44C is closed.
Page 386 Controller Section Video Input Scaling Ampliﬁers and Limiter 9. Disconnect the CAL OUTPUT signal from the INPUT 50Ω connector. 10.The level at pin 3 of U10 should drop to −0.35 Vdc. If the level is less (more negative) than −0.35 Vdc, replace voltage clamp D3. 11.Measure the dc level of the ﬂash video at pin 2 of R47.
Page 387: 12-Bit Flash Adc (8564Ec And 8565Ec)
Controller Section 12-Bit Flash ADC 12-Bit Flash ADC The ﬂash ADC (U22) converts the analog video signal into 12-bit digital values at a ﬁxed rate of 12 megasamples per second. When measuring voltages or waveforms on the Fast ADC of the A2 controller assembly, connect the ground (or common) lead to the ground-plane trace associated with the shield.
Page 388: Byte Static Ram (8564Ec And 8565Ec)
Controller Section 32 K-Byte Static RAM 32 K-Byte Static RAM The static RAM stores the ADC samples that are taken when the Fast ADC circuitry is in the "write" mode. When not in the "write" mode, the static RAM is read by the CPU to retrieve the fast ADC data. The 8-bit DFADC bus connects the outputs of latches within U35 to the data port of static RAM U21.
Page 389: Reference Clock (8564Ec And 8565Ec)
Controller Section Reference Clock Reference Clock The reference clock circuitry takes the 8 MHz square wave clock and triples the frequency to 24 MHz. This is accomplished through two stages of ﬁltering of the 8 MHz signal, to extract the third harmonic. The 8 MHz signal is ﬁrst passed through a high pass ﬁlter consisting of C123 and L15.
Page 390: 16 Mhz Harmonic Filter (8564Ec And 8565Ec)
Controller Section 16 MHz Harmonic Filter 16 MHz Harmonic Filter The 16 MHz Harmonic Filter generates a 16 MHz signal through a series of stages, consisting of a ﬁlter and a comparator. The 10 MHz reference signal from the A15 RF assembly is ﬁrst prescaled by 2.5 to yield a 4 MHz signal with a 20 percent duty cycle.
Page 391: State- And Trace-Storage Problems
Controller Section State- and Trace-Storage Problems State- and Trace-Storage Problems State storage is in the two of the four Program RAMs and trace storage is in the two display RAMs. With low battery voltage, it is normal for states and traces to be retained if the power is off for less than 1 minute.
Page 392: Keyboard Problems
Controller Section Keyboard Problems Keyboard Problems If the analyzer does not respond to keys being pressed or the knob being rotated, the fault could be either on the A3 interface assembly or the A2 controller assembly. To isolate the A2 controller assembly, use the following procedure.
Page 393 8560 EC-SERIES CONTROLLER SECTION LHALT POWER RESET CHIP SELECT REF CLOCK +28V SUPPLIES CIRCUITRY AND CONTROL (24 MHz) +15VF DRESET POWER 8 MHz TTL +5VF FUNCTION CABLE BLOCKS -12.6VF -15VF 16 MHz TTL Note: Dark Shaded area indicates the functions implemented in U16. J1-6 HSWP OPTION...
Page 394: Synthesizer Section
Synthesizer Section...
Page 395 Synthesizer Section Introduction Introduction The synthesizer section includes the A7 LOMA (LO multiplier/ ampliﬁer), the A11 YTO, and parts of the A14 frequency control and A15 RF assemblies. Simpliﬁed and detailed block diagrams for each assembly are located at the end of this chapter. Page Test Connector Locations..........
Page 396 Synthesizer Section Introduction All of the assemblies are extremely sensitive to electrostatic discharge CAUTION (ESD). For further information regarding electrostatic cautions, refer to “Electrostatic Discharge”"Electrostatic Discharge Information" in Chapter 1 . Using an active probe, such as an 85024A, with a spectrum analyzer is CAUTION recommended for troubleshooting the RF circuitry.
Page 397: Test Connector Locations
Synthesizer Section Test Connector Locations Test Connector Locations When troubleshooting suspected faulty circuits, use Table 11-1 on page 525 to determine which procedure to perform. Figure 11-1 illustrates test connector locations on the A14 and A15 assemblies. The pin locations of a 16-pin test connector are indicated in Figure 11-2 on page 525.
Page 398 Synthesizer Section Test Connector Locations Figure 11-2 Test Connector Pin Locations Table 11-1 Troubleshooting Suspected Faulty Circuits Suspected Circuit Procedure to Perform YTO loop Conﬁrming a Faulty Synthesizer Section (steps 12-33) 1st LO Conﬁrming a Faulty Synthesizer Section (steps 9-11) 1st LO pretune frequency and amplitude Unlocked YTO PLL (steps 9-12)
Page 399 Synthesizer Section Test Connector Locations Table 11-1 Troubleshooting Suspected Faulty Circuits Suspected Circuit Procedure to Perform YTO loop phase/frequency detector Unlocked YTO PLL (steps 27-34) YTF gain and offset DACs YTF Driver Circuit (steps 10-23) Level at ampliﬁer input Third LO Driver Ampliﬁer (steps 1-6) Levels into mixer A15U400 Unlocked YTO PLL (steps 3-13)
Page 400: Troubleshooting Test Setup
Synthesizer Section Troubleshooting Test Setup Troubleshooting Test Setup Some synthesizer section problems require placing the YTO PLL in an unlocked condition. This is done by moving jumper A14J23 to the TEST position. This grounds the YTO ERROR signal and disables the CPU from detecting an unlocked YTO.
Page 401: Conﬁrming A Faulty Synthesizer Section
Synthesizer Section Conﬁrming a Faulty Synthesizer Section Conﬁrming a Faulty Synthesizer Section The A11 YTO (the 1st LO of the spectrum analyzer) is a YIG-tuned oscillator which tunes from 2.95 to 6.8107 GHz. The A7 LO multiplier/ampliﬁer (LOMA) levels the A11 output and distributes the signal to the following: A8 low band mixer A10 YIG-tuned mixer/ﬁlter (RYTHM)
Page 402: Conﬁrming A Faulty Synthesizer Section
If the tune voltage is correct, but the ADC measures the voltage and determines it to be out of speciﬁcation, troubleshoot the A3 assembly ADC MUX. Table 11-2 Center Frequency Tuning Values 8564EC and 8565EC Center Sampling Oscillator Frequency Frequency (MHz) (MHz) 2156.3 285.000...
Page 403 Synthesizer Section Conﬁrming a Faulty Synthesizer Section 10.Set the spectrum analyzer to the following settings: Center frequency ............300 MHz Span ................100 MHz 11.If the 1st LO is present, a signal should be displayed at about −10 dBm (approximately ±20 MHz from the center frequency). If no signal is displayed and ERR 338 LOMA AGC, ERR 339 SBTX AGC, or ERR 340 SAMP AGC is not present, suspect the A7 LOMA.
Page 404 Synthesizer Section Conﬁrming a Faulty Synthesizer Section 17.Tune the source 1 kHz above the fractional N frequency. The voltage measured on the DVM should be approximately −12 Vdc. 18.If the DVM reading does not change, the A14 frequency control assembly is defective. Reconnect W32 to A14J501. Replace the jumper on A14J23 to the NORM position.
Page 405 Synthesizer Section Conﬁrming a Faulty Synthesizer Section 24.Set the spectrum analyzer and 8340A/B frequencies to the combinations listed in Table 11-3 on page 533 and press SGL SWP the spectrum analyzer. Figure 11-4 Sampler and Sampling Oscillator Test Setup 25.At each combination, the frequency counter should measure a sampler IF as shown in Table 11-3 on page 533.
Page 406 Synthesizer Section Conﬁrming a Faulty Synthesizer Section 32.If the power is less than −6.5 dBm, suspect W34, A7 LOMA, or A11 YTO. 33.Move jumper A14J23 to the NORM position. Table 11-3 Sampling Oscillator Test Frequencies 8340A CW 8564/5EC Center Offset PLL Counter Frequency Frequency...
Page 407: General Pll Troubleshooting
Synthesizer Section General PLL Troubleshooting General PLL Troubleshooting The synthesizer section relies heavily on phase-locked loops (PLL). Typically, faulty PLLs are either locked at the wrong frequency or unlocked. The information below applies to troubleshooting these two classes of problems on a generalized PLL. PLL Locked at Wrong Frequency Numbers in the following text identify items in Figure 11-5 on page...
Page 408: Unlocked Pll
Synthesizer Section General PLL Troubleshooting Figure 11-5 PLL Locked at Wrong Frequency Unlocked PLL An unlocked PLL can be caused by problems inside or outside the PLL. Troubleshoot this problem by working backward from the oscillator as described in the steps below. Numbers in the following text identify items in Figure 11-6 on page 536.
Page 409 Synthesizer Section General PLL Troubleshooting Measurement Point YTO PLL A14J23 pin 1 (YTO ERROR) Reference PLL A15J502 pin 3 (LO3 ERR) Sampler PLL A15J200 pin 13 (OFL ERR) Fractional N PLL A14TP13 (INTEGRATOR) Figure 11-6 Unlocked PLL 2. If the integrator output voltage changes in the manner described in step 1, the problem is external to the PLL.
Page 410: Unlocked Reference Pll (100 Mhz Vcxo)
Synthesizer Section Unlocked Reference PLL (100 MHz VCXO) Unlocked Reference PLL (100 MHz VCXO) Operation (100 MHz VCXO) The 600 MHz reference is generated by tripling, then doubling the output of the 100 MHz phase-locked loop. If the 600 MHz reference is off frequency, the 100 MHz phase-lock circuitry is probably at fault.
Page 411 Synthesizer Section Unlocked Reference PLL (100 MHz VCXO) 8. If the 100 MHz oscillator is working, the reason for the unlocked condition is either a problem in the 10 MHz reference or a fault in the signal path around the loop. Check 10 MHz 9.
Page 412 Synthesizer Section Unlocked Reference PLL (100 MHz VCXO) 19.If the loop is unlocked, but signals are present on both inputs of the phase/frequency detector, the output pulses will be superimposed on each other. 20.If the loop is unlocked, and there is no signal at one of the phase/frequency detector inputs, one phase detector output will be at TTL low and the other will be at TTL high.
Page 413 Synthesizer Section Unlocked Reference PLL (100 MHz VCXO) The 300 MHz CAL OUTPUT signal comes from the tripled 100 MHz NOTE which is passed through a leveling loop. The 300 MHz signal passes through a low-pass ﬁlter for reducing higher harmonics. These harmonics can fool the detector.
Page 414: Third Lo Driver Ampliﬁer (100 Mhz Vcxo)
Synthesizer Section Unlocked Reference PLL (100 MHz VCXO) Third LO Driver Ampliﬁer (100 MHz VCXO) The third LO driver ampliﬁer (Q503) ampliﬁes the 300 MHz from the 300 MHz distribution ampliﬁer to a sufﬁcient level to drive the LO port of the double balanced mixer.
Page 415: Unlocked Offset Lock Loop (Sampling Oscillator)
Synthesizer Section Unlocked Offset Lock Loop (Sampling Oscillator) Unlocked Offset Lock Loop (Sampling Oscillator) Operation The offset lock loop drives the A15U100 sampler. The offset lock loop sampling oscillator tunes to one of sixteen discrete frequencies between 285 MHz and 297.222 MHz. Refer to A15 schematic (sheet 3 of 4). The oscillator output and the reference PLL 300 MHz signal is mixed by A15U400 to produce a 3 MHz to 15 MHz IF signal.
Page 416 Synthesizer Section Unlocked Offset Lock Loop (Sampling Oscillator) 6. The voltage required to tune the oscillator should measure between +15 Vdc and +19 Vdc. If the voltage is out of this range, perform the sampling oscillator adjustment in Chapter 2. 7.
Page 417 Synthesizer Section Unlocked Offset Lock Loop (Sampling Oscillator) 11.If the feedback signal is not near the indicated power, measure the signals at the following test points on the feedback path. Refer to function blocks AD, AG, and AH of A15 RF schematic (sheet 3 of 4). A15TP200 +4 dBm A15TP201...
Page 418 Synthesizer Section Unlocked Offset Lock Loop (Sampling Oscillator) 22.Short C441 with a wire jumper. (Connect the jumper from the end of R462 nearest C441 to the end of R460 nearest C443.) This changes the loop integrator into a voltage follower. Refer to function block AB of A15 RF schematic (sheet 3 of 4).
Page 419: Operation
Synthesizer Section Unlocked YTO PLL Unlocked YTO PLL Operation The A11 YTO is locked to two other oscillators, the fractional N oscillator and the offset PLL sampling oscillator. For LO spans of 2.01 MHz and greater, either the FM or main coil of the YTO is swept directly.
Page 420: Unlocked Yto Pll
Synthesizer Section Unlocked YTO PLL Notice that the polarity of the YTO loop error voltage (YTO ERROR) out of the YTO loop phase/frequency detector changes as a function of the polarity of the sampler IF. That is, for positive sampler IFs, an increasing YTO frequency results in an increasing YTO ERROR signal.
Page 421: Troubleshooting An Unlocked Yto Pll
Synthesizer Section Unlocked YTO PLL Table 11-5 Ampliﬁer Polarities YTO Error Sign ERRSGN Ampliﬁer (A14U313 pin 19) Fractional N Positive Positive TTL High Oscillator Sampler IF Swept Negative Negative TTL Low Sampler IF FM/Main Positive Positive TTL High Coils Swept Sampler IF Negative Negative...
Page 422 Synthesizer Section Unlocked YTO PLL Figure 11-7 Troubleshooting an Unlocked YTO PLL 5. Calculate the YTO frequency error by subtracting the frequency recorded in step 3 from the frequency recorded in step 4. Record the result below: YTO Frequency Error = _______________________MHz −YTO YTO frequency error = YTO frequency (MEASURED)
Page 423 Synthesizer Section Unlocked YTO PLL • Check the YTO DACs using the procedure in steps 41 through 49 below. • Refer to steps 9 through 34 below. 8. If the YTO Frequency error recorded in step 5 is less than 20 MHz, do the following: •...
Page 424 Synthesizer Section Unlocked YTO PLL 16.If a problem exists only at particular CENTER FREQ and SPAN settings, determine the desired fractional N oscillator frequency by pressing MORE 1 OF 2 FREQ DIAGNOSE FRAC N FREQ setting the spectrum analyzer to SINGLE trigger mode. 17.If the fractional N oscillator frequency is not correct, refer to "Unlocked Fractional N PLL"...
Page 425 Synthesizer Section Unlocked YTO PLL 31.As the signal generator frequency is increased to 76 MHz, the voltage at A14J17 pin 1 should change from approximately +12 V to −12 V. 32.Set the signal generator to the following settings and repeat step 30. Frequency ..............
Page 426 Synthesizer Section Unlocked YTO PLL 40.Change the to 678.8 MHz with the SPAN remaining CENTER FREQ 0 Hz. This will change the switch setting of U326A and invert the voltages listed in Table 11-6 on page 558. Table 11-6 Voltages in FM Coil and Main Loop Drivers Measurement Points Voltages A14U405 pin 6...
Page 427 Synthesizer Section Unlocked YTO PLL 49.Measure the output of the main coil tune DAC (A14J18 pin 3) with a DVM. Refer to function block E of A14 frequency control schematic (sheet 2 of 5). 50.If the spectrum analyzer center frequency is 300 MHz, the voltage at A14J18 pin 3 should measure −3.35 V ±0.25 V.
Page 428: Unlocked Fractional N Pll
Synthesizer Section Unlocked Fractional N PLL Unlocked Fractional N PLL Operation The fractional N oscillator is used as a reference for the 1st LO phase locked loop. It provides the 1 Hz start-frequency resolution for the 1st LO, and is the means by which the 1st LO is swept in LO spans of 2 MHz or less (fractional N spans).
Page 429: Fractional N Pll
Synthesizer Section Unlocked Fractional N PLL 7. Check that the postscaler is dividing properly. The frequency at A14J304 should be equal to the frequency at A14TP4 divided by either 5, 6, or 7. Refer to Table 11-8 on page 561. To keep the divide number at a constant value set the spectrum analyzer to: Span .................
Page 430 Synthesizer Section Unlocked Fractional N PLL 4. Check the frequency at A14TP1. It should equal the value found by pressing , and MORE 1 OF 2 FREQ DIAGNOSE RAW OSC FREQ 5. Check the tune voltage at R240 in function block AQ. 6.
Page 431 Synthesizer Section Unlocked Fractional N PLL Figure 11-8 VCO Bias Voltages for A14 Assemblies Chapter 11...
Page 432 Synthesizer Section Unlocked Fractional N PLL 9. Divider and integrator troubleshooting: Measure the frequency of the pulses at TP6 in block AO. Look up the expected problem area in Table 11-11 on page 566 and go to the appropriate troubleshooting steps.
Page 433 Synthesizer Section Unlocked Fractional N PLL The polarity of the output of the loop gain (block AP, TP12) should be the same as the polarity of the input (TP11). The integrator op amp (U106) output (TP13) should try to go very positive (about +12 V) if its average input (TP12) is positive.
Page 434: Frequency Span Accuracy Problems
Synthesizer Section Frequency Span Accuracy Problems Frequency Span Accuracy Problems The spectrum analyzer employs lock-and-roll tuning to sweep the 1st LO for spans greater than 2.0 MHz. The 1st LO is locked to the start frequency immediately after the previous sweep has been completed. The 1st LO is then unlocked, and, when a trigger signal is detected, the 1st LO sweeps (rolls).
Page 435: Conﬁrming Span Problems
Synthesizer Section Frequency Span Accuracy Problems 2. Determine the harmonic-mixing number from the information in Table 11-13 on page 569. Table 11-13 Harmonic Mixing Number versus Center Frequency Center Frequency Harmonic Mixing Number 9 kHz to 2.9 GHz 2.75 GHz to 6.46 GHz 5.86 GHz to 13.2 GHz 12.4 GHz to 31.15 GHz 30.5 GHz to 50.6 GHz...
Page 436: Yto Main Coil Span Problems (Lo Spans >20 Mhz)
Synthesizer Section Frequency Span Accuracy Problems YTO Main Coil Span Problems (LO Spans >20 MHz) For YTO main coil spans, the YTO is locked at the beginning of the sweep and the sweep ramp is summed into the main coil tune driver. 1.
Page 437 Synthesizer Section Frequency Span Accuracy Problems 6. The rest of the procedure troubleshoots the YTO FM coil driver. Refer to function block M of A14 frequency control schematic (sheet 2 of 5). Table 11-14 Settings of Sweep Switches Switch Switch State Switch Control Control Line Line (Pin #)
Page 438: Fractional N Span Problems (Lo Spans ≤2 Mhz)
Synthesizer Section Frequency Span Accuracy Problems j. If the voltage at U332 pin 2 is correct with A14J3 pins 9 and 10 shorted, but was incorrect with W10 connected, the YTO FM coil is probably open; replace the A11 YTO. k.
Page 439: 1St Lo Span Problems (Multiband Sweeps)
See function block B of A14 schematic (sheet 1 of 5). Also, the sum of the individual ramps is 10 V. For the 8564EC, Figure 11-9 on page 574 illustrates both sweep and the scan ramp for a 0 GHz to 40 GHz span with instrument preset conditions.
Page 440 Synthesizer Section Frequency Span Accuracy Problems Figure 11-9 8564EC Sweep and Scan Ramps Figure 11-10 8565EC Sweep and Scan Ramps Chapter 11...
Page 441: Phase Noise Problems
Synthesizer Section Phase Noise Problems Phase Noise Problems System phase noise can be a result of noise generated in many different areas of the spectrum analyzer. When the spectrum analyzer is functioning correctly, the noise can be observed as a function of the distance away (the offset) from the carrier frequency.
Page 442: Reference Versus Reference Pll Phase Noise
Synthesizer Section Phase Noise Problems Reference versus Reference PLL Phase Noise If the problem seems to be in the frequency reference or reference PLL circuitry, measure the noise with internal and external references. If there is no difference, suspect the circuitry associated with the 100 MHz VCXO Fractional N versus Offset PLL or YTO PLL Phase Noise...
Page 443: Sampler And Sampler If
Synthesizer Section Sampler and Sampler IF Sampler and Sampler IF The A15U100 sampler creates and mixes harmonics of the sampling oscillator with the 1st LO. The resulting sampler IF (60 MHz to 96 MHz) is used to phase-lock the YTO. The sampler IF ﬁlters unwanted products from the output of A15U100 and ampliﬁes the IF to a level sufﬁcient to drive the YTO loop.
Page 444 Synthesizer Section Sampler and Sampler IF • If adjusting the sampler match does not bring the signal at A15TP101 within speciﬁcation when the signal at A15TP201 is correct, the A15U100 sampler is defective. 8. The sampler IF signal at A15J101 is 60 MHz to 96 MHz at −10 dBm to +5 dBm.
Page 445: Sweep Generator Circuit
Synthesizer Section Sweep Generator Circuit Sweep Generator Circuit The sweep generator circuitry generates a ramp from 0 to 10 volts during the sweep time. The available sweep times range from 50 µs to 2,000 seconds. The sweep times are generated in two different ranges, a 50 µs to 30 ms range and a 50 ms to 2,000 second range.
Page 446 Synthesizer Section Sweep Generator Circuit Press and set the spectrum analyzer to the following PRESET settings: 18.Using an oscilloscope, check that the sweep ramp at A14U320 pin 6 sweeps linearly from 0 to +10 Volts in 50 ms, then resets to 0 Volts. 19.Change the sweep time to 10 seconds and check that the sweep ramp (U320 pin 6) sweeps linearly from 0 to +10 Volts in 10 seconds, then resets to 0 Volts.
Page 447 Synthesizer Section Sweep Generator Circuit Figure 11-11 Simpliﬁed Synthesizer Section Chapter 11...
Page 448 Synthesizer Section Sweep Generator Circuit Figure 11-12 Simpliﬁed A14 Assembly Block Diagram Chapter 11...
Page 449 Synthesizer Section Sweep Generator Circuit Figure 11-13 Simpliﬁed A15 Assembly Block Diagram (100 MHz PLL) Chapter 11...
Page 450: A21 Ocxo
Synthesizer Section A21 OCXO A21 OCXO The spectrum analyzer uses an oven-controlled crystal oscillator (OCXO). It is deleted in Option 103 and replaced by a temperature-compensated crystal oscillator (TCXO), located on the A15 RF assembly. Connectors J305 and J306 on the A15 RF assembly are located where the TCXO would be installed in an Option 103.
Page 454: Rf Section
RF Section...
Page 455 RF Section Introduction Introduction The RF Section converts the input signal to a 10.7 MHz IF (Intermediate Frequency). See Figure 12-11 on page 631 for a detailed block diagram. The block diagrams for the A14 and A15 assemblies are located in NOTE Chapter 11, Synthesizer Section.
Page 456: Troubleshooting Using The Diagnostic Software
RF Section Troubleshooting Using the Diagnostic Software Troubleshooting Using the Diagnostic Software The adjustment and diagnostic software is documented in Chapter 2 . The software troubleshoots RF failures by testing signal paths and allowing you to control various latches and DACs. The ﬁrst thing it does is to check that all of the frequency bands are functional.
Page 457 RF Section Troubleshooting Using the Diagnostic Software Figure 12-1 Diagnostic Software Connection Locations, A14 and A15 Chapter 12...
Page 458 RF Section Troubleshooting Using the Diagnostic Software Figure 12-2 Diagnostic Software Connection Locations, RF Section Chapter 12...
Page 459 RF Section Troubleshooting Using the Diagnostic Software Table 12-1 Procedures To Use For Isolating Faults Suspected Faulty Circuit Manual Procedure to Perform 2nd IF Ampliﬁer Third Converter 2nd IF Distribution Third Converter 10.7 MHz IF Out of Double Balanced Mixer Third Converter 300 MHz CAL OUTPUT 8.
Page 460: Low Band Problems
RF Section Low Band Problems Low Band Problems 1. Disconnect all inputs from the front panel INPUT 50Ω connector. 2. Set the spectrum analyzer to the following settings: Center frequency ............0 Hz Span ................1 MHz Input attenuator ............0 dB 3.
Page 461: High Band Problems
RF Section High Band Problems High Band Problems 1. If the low band is functioning, but amplitudes of signals >26.8 GHz are wrong, check the A12 SBTX. 2. If the low band and millimeter band signals are correct, but microwave band signals are wrong, check the A10 RYTHM. 3.
Page 462: Low And High Band Problems
RF Section Low and High Band Problems Low and High Band Problems 1. On the spectrum analyzer, press PRESET REALIGN LO & . If any error messages are displayed, refer to “Error Messages” Chapter 7 2. Perform "External Mixer Amplitude Adjustment" in Chapter 3. If this adjustment cannot be completed, perform the steps located in "Third Converter"...
Page 463: A7 Lo Multiplier And Distribution Ampliﬁer
RF Section A7 LO Multiplier and Distribution Ampliﬁer A7 LO Multiplier and Distribution Ampliﬁer YTO unlock errors may occur if the power delivered to the A15U100 NOTE sampler is less than −9.5 dBm. Frequency response will be degraded in both internal and external mixing modes if the output power is low or unlevelled.
Page 464 RF Section A7 LO Multiplier and Distribution Ampliﬁer 9. The measured voltage should be approximately +5 Vdc. If the voltage is not +5 Vdc, troubleshoot the A14 frequency control assembly. 10.Connect the positive lead of a DVM to A14J18 pin 15. The voltage should measure within ±10 mV of the Gate Bias voltage listed on the A7 label.
Page 465: A8 Low Band Mixer
RF Section A8 Low Band Mixer A8 Low Band Mixer 1. Connect the spectrum analyzer CAL OUTPUT to the INPUT 50 Ω connector. 2. Set the spectrum analyzer as follows: Center frequency ............. 300 MHz Span ................. 0 Hz Input attenuation ............10 dB 3.
Page 466: A9 Input Attenuator
RF Section A9 Input Attenuator A9 Input Attenuator 1. Perform the "Input Attenuator Accuracy" performance test in the 8560 E-Series Spectrum Analyzer Calibration Guide. 2. If there is a step-to-step error of approximately 10 dB or more, continue with step 3. 3.
Page 467 RF Section A9 Input Attenuator Table 12-2 Attenuator Control Truth Table (W11 connected to A14J6) A14U421 ATTEN 10 dB 30 dB 20 dB Setting (dB) * reads ≈ 0.2 V (ﬂoating) when W11 is disconnected H ≈ 28 V L ≈ 0.6 V Table 12-3 Attenuator Control Truth Table (W11 connected or disconnected from A14J6)
Page 468 RF Section A9 Input Attenuator Table 12-4 Attenuator Control Truth Table (W11 connected or disconnected from A14J6) A14U421 ATTEN 10 dB 30 dB 20 dB Setting (dB) F Floating (≈0.2 V) L ≈ 0.6 V Chapter 12...
Page 469: A10 Yig-Tuned Filter/Mixer (Rythm)
RF Section A10 YIG-Tuned Filter/Mixer (RYTHM) A10 YIG-Tuned Filter/Mixer (RYTHM) The RF diagnostics routine in the adjustment/diagnostic software is recommended for troubleshooting faults in and around A10. The RF diagnostics will prompt you where to connect a source and another spectrum analyzer to make RF signal level measurements.
Page 470: A12 Switched Barium-Tuned Mixer (Sbtx)
RF Section A12 Switched Barium-Tuned Mixer (SBTX) A12 Switched Barium-Tuned Mixer (SBTX) The RF diagnostics routine in the adjustment/diagnostic software is recommended for troubleshooting faults in and around A12. The RF diagnostics will prompt you where to connect a source and another spectrum analyzer to make RF signal level measurements.
Page 471: A13 Second Converter
RF Section A13 Second Converter A13 Second Converter The A13 assembly is extremely sensitive to Electrostatic Discharge CAUTION (ESD). For further information regarding electrostatic cautions, refer to “Electrostatic Discharge” Chapter 1 . 1. Connect the spectrum analyzer CAL OUTPUT to the INPUT 50Ω connector.
Page 472 RF Section A13 Second Converter c. The voltage should measure +15 Vdc ±0.2 V. If the voltage measures outside this limit, the A14 frequency control assembly is probably defective. d. Press to turn the spectrum analyzer off. Reconnect W13 to LINE A14J12, and press to turn the spectrum analyzer on.
Page 473: A14 Frequency Control Assembly
RF Section A14 Frequency Control Assembly A14 Frequency Control Assembly The block diagrams for the A14 and A15 assemblies are located in NOTE Chapter 11 , “Synthesizer Section.” LO Multiplier/Ampliﬁer Drive Refer to function block Z on the A14 Frequency Control Schematic Diagram in the 8560 E-Series Spectrum Analyzer Component Level Information.
Page 474 RF Section A14 Frequency Control Assembly • If the voltages measure as indicated in step 3 and step 6, measure the A11 YTO output. See Figure 12-4 on page 614. • If all measurements are within limits, refer to "A7 LO Multiplier and Distribution Ampliﬁer"...
Page 475 RF Section A14 Frequency Control Assembly Figure 12-4 A7 LO Multiplier/Ampliﬁer Drive Chapter 12...
Page 476: Control Latch For Band-Switch Drivers
RF Section A14 Frequency Control Assembly Control Latch for Band-Switch Drivers Refer to function block P on A14 Frequency Control Schematic Diagram in the 8560 E-Series Spectrum Analyzer Component Level Information. 1. Connect the positive lead of a DVM to A14U417 pin 14 (LLOWBAND) and the negative lead to A14J18 pin 6.
Page 477 RF Section A14 Frequency Control Assembly positive 3.9107 GHz 1st IF offset between the desired harmonic of the YTO frequency and the center frequency. This signal is 0.5 V/GHz of tuned frequency and is available at the rear panel. The output can be set for 0.50 V/GHz or 0.25 V/GHz.
Page 478 RF Section A14 Frequency Control Assembly Figure 12-5 8564EC Rear Panel SWP Output Figure 12-6 8565EC Rear Panel SWP Output Chapter 12...
Page 479 RF Section A14 Frequency Control Assembly Figure 12-7 8564EC Signal at A14J15 Pin 1 Figure 12-8 8565EC Signal at A14J15 Pin 1 Chapter 12...
Page 480 RF Section A14 Frequency Control Assembly 9. Check the voltage at A14J15 pin 3 with the spectrum analyzer center frequency set to the frequencies listed in Table 12-5. The following table lists the voltage that should be measured at A14J15 pin 3, the settings for the four switches (U416 in function block Q), and the gain through the Sweep + Tune Multiplier.
Page 481 RF Section A14 Frequency Control Assembly 20.Connect the DVM to A14J16 pin 3. 21.Change the center frequency in 1 GHz steps and conﬁrm that the voltage changes by 220 mV/GHz in microwave bands and 250 mV/GHz in millimeter bands. 22.Move the WR PROT/WR ENA jumper on the A2 Controller assembly to the WR PROT position.
Page 482: A15 Rf Assembly
RF Section A15 RF Assembly A15 RF Assembly The block diagrams for the A14 and A15 assemblies are located in NOTE Chapter 11, Synthesizer Section. Conﬁrming a Faulty Third Converter 1. Perform the "IF Input Amplitude Accuracy" performance test in the 8560 E-Series Spectrum Analyzer Calibration Guide.
Page 483: Third Converter
RF Section A15 RF Assembly 3. Press SGL SWP IF ADJ OFF 4. Disconnect W29 (coax 7) from A15J601. 5. Connect a test cable from A15J601 to the input of another spectrum analyzer. 6. Tune the other spectrum analyzer to 10.7 MHz. The signal displayed on the other spectrum analyzer should be approximately −15 dBm.
Page 484 RF Section A15 RF Assembly For troubleshooting, it is recommended that you use an active probe, CAUTION such as an 85024A, and a second spectrum analyzer. If an 1120A active probe is being used with a spectrum analyzer having dc coupled inputs, such as the 8566A/B, 8569A/B and the 8562A/B, either set the active probe for an ac-coupled output or use a dc-blocking capacitor between the active probe and the spectrum analyzer input.
Page 485: Flatness Compensation Control
RF Section A15 RF Assembly b. For maximum gain (ﬂatness data equals 0), RF GAIN (A15U909 pin 10) should be at approximately 0 Vdc and the current through each attenuator section should be close to 0 mA. As long as the ﬂatness data just entered is not stored, the CAUTION previously-stored ﬂatness data will be present after the power is cycled.
Page 486: Sig Id Oscillator (Option 008)
RF Section A15 RF Assembly 8. On the spectrum analyzer, press and set the to 1 MHz. PRESET SPAN Set the oscilloscope for the following settings: Amplitude scale ............2 V/div Sweep time .............. 20 ms/div 9. The waveform should be at a TTL high during part of the retrace period and a TTL low during the sweep (about 50 ms).
Page 487: 10 Mhz Reference
RF Section A15 RF Assembly 5. On the spectrum analyzer, press until A15J901 pin 13 is at SGL SWP TTL low. Diodes CR603 and CR605 should be forward biased and CR604 should be reverse biased (approximately 6 Vdc reverse bias). Diodes CR501 and CR502 should be forward-biased, disabling the 3rd LO Driver Ampliﬁer.
Page 488 RF Section A15 RF Assembly 7. Connect a 10 MHz, −2 dBm, signal to the rear panel 10 MHz REF IN/OUT connector. 8. Check the signals at A15J301, A15J302, A15J303, and A15J304 according to the procedure in steps 2 through 4. 9.
Page 489 RF Section A15 RF Assembly Figure 12-10 10 MHz TTL Reference at U304 Pin 13 Chapter 12...
Page 490 RF Section A15 RF Assembly Table 12-6 on page 629 lists the RF Section mnemonics shown in Figure 12-11 on page 631 and provides a brief description of each. Table 12-6 RF Section Mnemonic Table Mnemonic Description TUNE+, TUNE− YTF Tune Signal (SBTX or RYTHM) HTR+, HTR−...
Page 492: Display/Power Supply Section
Display/Power Supply Section...
Page 493: Introduction
Display/Power Supply Section Introduction Introduction The Display/Power Supply chapter consists of the following sections: A17 LCD Display..............page 635 A6 Power Supply ............. page 654 The A6 power supply in 8560 EC-series instruments contains lethal WARNING voltages with lethal currents in all areas. Use extreme care when servicing these assemblies.
Page 494: Lcd Display (8564Ec And 8565Ec)
Display/Power Supply Section LCD Display LCD Display The display section of 8564EC and 8565EC instruments contain the A17 display driver, the A17A1 inverter board, the A18 LCD (liquid crystal display), and the A6 power supply. The A6 power supply is explained in the power supply section which begins on page 590.
Page 495: Overview Of A17 Display Driver Board
Display/Power Supply Section LCD Display Figure 13-1 Simpliﬁed LCD Block Diagram Overview of A17 Display Driver Board The A17 display driver board monitors the 8560 EC-series controller board, copies display instructions to local memory, creates a bitmap from the data, and generates the signals needed to drive the LCD display and a VGA monitor.
Page 496: Troubleshooting The Lcd Display
Display/Power Supply Section Troubleshooting the LCD Display Troubleshooting the LCD Display There are no adjustments for intensity or focus of the LCD. NOTE Blank Display 1. If the LED above the front-panel LINE switch is lit, most of the A6 power supply is functioning properly.
Page 497: Dim Display
Display/Power Supply Section Troubleshooting the LCD Display Dim Display 1. If the display is dim, suspect the backlights, which are inserted into the LCD assembly from the backlight assembly. Always replace both backlights at the same time. To replace the backlights, see page 189 of procedure 2A.
Page 498 Display/Power Supply Section Troubleshooting the LCD Display Figure 13-3 Location of +5V supply pins on J1 of A17 and J8 of A2 Figure 13-3 shows A2J8 connections on 8560 EC-Series Instruments. Lines 2 −5 and 42 − 44 supply +5V to the two LCD backlights. Lines 1 and 41 supply +5V to the A17A1 Inverter board.
Page 499: Power Supply
Display/Power Supply Section A6 Power Supply Assembly A6 Power Supply Assembly 8564EC , and 8565EC spectrum analyzers use a switching power supply operating at 40 kHz to supply the low voltages for most of the analyzer hardware. Kick starting occurs when there is a fault either on the power supply or on one of the other assemblies.
Page 500: Line Fuse Blowing
LINE either the input ﬁlter or the power switch cable assembly. 2. If the line fuse blows when the 8564EC and 8565EC spectrum analyzers are turned on, disconnect the power cord and lift the drain of A6Q102 from TP108. If the line fuse still blows, suspect CR102 through CR105.
Page 501: Supply Restarting Every 1.5 Seconds (Kick Start)
Display/Power Supply Section A6 Power Supply Assembly Supply Restarting Every 1.5 Seconds (Kick Start) See function blocks G, H and L of A6 power supply schematic diagram in the component-level information binder. If there is a short on the power supply or on one of the other assemblies, the power supply will attempt to "kick start."...
Page 502: Buck Regulator Control
Display/Power Supply Section A6 Power Supply Assembly Buck Regulator Control See function block H of the A6 power supply schematic diagram in the component-level information binder. The buck regulator control pulse-width modulates the buck regulator and provides a synchronized signal to the DC-DC converter control circuitry.
Page 503: Dc-Dc Converter Control
Display/Power Supply Section A6 Power Supply Assembly DC-DC Converter Control See function block I of A6 power supply schematic diagram in the component-level information binder. The DC-DC converter control circuitry divides the 80 kHz squarewave from U202A and generates two complementary 40 kHz squarewaves to drive the FETs in the DC-DC converter.
Page 505: Component-Level Information Packets
Component-Level Information Packets...
Page 506: Introduction
Component-Level Information Packets Introduction Introduction Component-Level Information Packets (CLIPs) contain a parts list, a component-location diagram, and schematic diagrams for selected instrument assemblies. Chapter 14...
Page 508 A9 input attenuator Agilent 8561E/63E options sweeps removal and replacement information 1st LO span problems abbreviations Agilent Technologies sales and 3 kHz and 10 kHz resolution access to internal assemblies service ofﬁces bandwidth problems accessories AM/FM demodulator 30 kHz resolution bandwidth...
Page 509 Index cables, pin out troubleshooting A4 cal osc using sampling oscillator error cal oscillator diagnostic software message 355 amplitude (A4R826) range troubleshooting A5 section span accuracy calibration error troubleshooting using diagnostic software messages 356 to 361 low-pass ﬁlter troubleshooting system error messages 750 to diagnostic software troubleshooting RF section...
Page 510 Index fractional N adjustment lines dim divider IF ﬁlter troubleshooting, 10.7 LO distribution ampliﬁer oscillator removal and replacement phase noise IF ﬁlter troubleshooting, 4.8 kHz LO Multiplier/Ampliﬁer span problems removal and replacement troubleshooting IF ﬁlter troubleshooting, 4.8 kHz LO multiplier/ampliﬁer fractional N PLL and 10.7 MHz LO multiplier/ampliﬁer...
Page 511 Index replacement SBTX rear frame removal and replacement OCXO removal scale ﬁdelity performance test OCXO adjustment replacement failures OCXO removal and replacement rear frame parts scan ramps recommended test equipment second converter offset lock loop removal and replacement offset PLL phase noise reference adjustment second IF ampliﬁer option 908...
Page 512 Index test equipment list test points W1 power-cable connections third converter W3 line switch cable third converter check removal third LO driver ampliﬁer replacement wire assembly cables tools write protect/enable jumper adjustment trace storage problems triggering YIG-tuned ﬁlter/mixer triggering problems removal and replacement troubleshooting YIG-tuned oscillator adjustment...

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Agilent Technologies 8564EC Service Manual

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