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Wiltron 54 A Series Maintenance Manual

Scalar measurement systems
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SERIES 54XXA
SCALAR MEASUREMENT SYSTEMS
MAINTENANCE MANUAL
490 JARVIS DRIVE
MORGAN HILL, CA 95037-2809
P/N: 10410-00123
REVISION: A
PRINTED: AUGUST 1992
COPYRIGHT 1992 WILTRON CO.

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  • Page 1 SERIES 54XXA SCALAR MEASUREMENT SYSTEMS MAINTENANCE MANUAL 490 JARVIS DRIVE MORGAN HILL, CA 95037-2809 P/N: 10410-00123 REVISION: A PRINTED: AUGUST 1992 COPYRIGHT 1992 WILTRON CO.
  • Page 2 WARRANTY The WILTRON product(s) listed on the title page is (are) warranted against defects in materials and workmanship for one year from the date of shipment, except for YIG-tuned oscillators, which are warranted for two years. WILTRON’s obligation covers repairing or replacing products which prove to be defective during the warranty period.
  • Page 3 MANUAL CHANGES MANUAL: Title: Series 54XXA Scalar Measurement Systems Maintenance Manual Part Number: 10410-00123 Rev. Ltr/Date: A / November 1992 CHANGE PACKET Part Number: 10900-00106 INSTRUCTIONS 1. Make the manual changes listed below. These changes are listed in numerical order by page number. 2.
  • Page 4 Chapter 2 — Replaceable Parts This Chapter lists all replaceable subassemblies and components for all 54XXA models. It explains the WILTRON exchange assembly program and provides parts ordering information. Chapter 3 — Troubleshooting This chapter provides information for troubleshooting 54XXA Scalar Measurement Systems. The troubleshooting information and fault location tables contained in this chapter support fault isola- tion down to a replaceable subassembly.
  • Page 5 Table of Contents (Continued) Appendix B — Fabrication of RF Detector Simulator This appendix contains information for fabricating the T1492 RF Detector Simulator test aid. This test aid is used in the calibration procedures contained in Chapter 6. Appendix C — Fabrication of Dummy Thermistor Test Aids This appendix contains information for fabricating the T38300 Dummy Down Converter Thermis- tor and the T38301 Dummy Directional Coupler Thermistor test aids.

  • Page 6: Table Of Contents

    Chapter 1 General Service Information Table of Contents SCOPE OF THE MANUAL ....1-3 INTRODUCTION ......1-3 IDENTIFICATION NUMBER .
  • Page 7 Figure 1-1. Model 5417A Scalar Measurement System with Detector and SWR Autotester (and Test Device)

  • Page 8: Scope Of The Manual

    A list of recommended test equipment is also provided. IDENTIFICATION NUMBER All WILTRON instruments are assigned a six-digit ID number, such as “101001.” This number appears on a decal affixed to the rear panel. Please use this identification number during any correspondence with WIL- TRON Customer Service about this instrument.

  • Page 9: Level Of Maintenance

    0.001 to 5409A 0.001 to The table at left lists the frequency ranges of all 54XXA models. For in- formation about the frequency ranges and characteristics of WILTRON 0.001 to 5411A SWR Autotesters and RF detectors normally used with series 54XXA 0.01...

  • Page 10: Related Manuals

    GENERAL SERVICE LEVEL OF INFORMATION MAINTENANCE Preventive Fan filter replacement, described in paragraph 1-7. Maintenance RELATED MANUALS The 54XXA Scalar Measurement Systems Operation Manual (10410- 00118) describes the front panel operation for all 54XXA models. It also contains general information, specifications, and Performance Verifica- tion procedures for all models.

  • Page 11: Static Sensitive Component Handling Precautions

    PREVENTIVE GENERAL SERVICE MAINTENANCE INFORMATION STATIC SENSITIVE The 54XXA contains components that can be damaged by static electric- COMPONENT HANDLING ity. Figure 1-3 illustrates the precautions that should be followed when PRECAUTIONS handling static-sensitive subassemblies and components. If followed, these precautions will minimize the possibilities of static-shock dam- age to these items.
  • Page 12 GENERAL STATIC HANDLING INFORMATION PROCEDURES Do not touch exposed contacts on Do not slide static sensitive Do not handle static sensitive any static sensitive component. component across any surface. components in areas where the floor or work surface covering is capable of generating a static charge.

  • Page 13: Recommended Test Equipment

    Adaptor Cable Connection to 54XXA Channel Inputs WILTRON Model 560-10BX P, A Detector Simulator Simulates WILTRON RF Detectors WILTRON T1492 (see Appendix B) Computer/Controller Personal computer, equipped with Any IBM compatible (or WILTRON P, T National PCIIA GPIB interface card...
  • Page 14 Chapter 2 Replaceable Parts Table of Contents INTRODUCTION ......2-3 EXCHANGE ASSEMBLY PROGRAM ... . . 2-3 REPLACEABLE SUBASSEMBLIES AND PARTS .
  • Page 15 PARTS ORDERING All parts listed in Tables 2-2 through 2-4 may be ordered from your lo- INFORMATION cal WILTRON service center (Table 2-1). Or, they may be ordered di- rectly from the factory at the address shown below. WILTRON Company...
  • Page 16 WILTRON REPLACEABLE SERVICE CENTERS PARTS Table 2-1. WILTRON Service Centers UNITED STATES CHINA JAPAN WILTRON COMPANY WILTRON BEIJING SERVICE ANRITSU CORPORATION 490 Jarvis Drive CENTER 1800 Onna Atsugi-shi Morgan Hill, CA 95037 - 2809 416 W Beijing Fourtune Bldg Kanagawa-Prf. 243 Japan...
  • Page 17 REPLACEABLE PARTS PARTS LISTS Table 2-2. Exchange Assembly Program 54XXA Subassemblies and Parts Reference 54XXA Assembly/Part 5407A 5409A 5411A 5417A 5419A 5428A 5430A 5431A 5436A 5437A 5447A Designator Option Front Panel PCB D35051-3 D35051-3 D35051-3 D35051-3 D35051-3 D35051-3 D35051-3 D35051-3 D35051-3 D35051-3 D35051-3...
  • Page 18 PARTS REPLACEABLE LISTS PARTS Table 2-3. Model Related 54XXA Replaceable Subassemblies and Parts Assembly/Part 5407A 5409A 5411A 5417A 5419A 5428A 5430A 5431A 5436A 5437A 5447A Ω B35283 B35283 B35283 C18650-1 C18650-1 C18650-1 C18650-1 C18650-1 C18650-1 C18650-1 RF Output Connector, , Type N Ω...
  • Page 19 REPLACEABLE MAJOR ASSEMBLIES PARTS LOCATION DIAGRAM FRONT PANEL FRONT PANEL INTERFACE D A N GE R H I GH V OL T A GE MONITOR ASSEMBLY RF DECK ASSEMBLY YIG DRIVER/ SIGNAL CHANNEL INTERFACE ALC/ FREQUENCY INSTRUCTION POWER CENTRAL SUPPLY PROCESSOR/ ASSEMBLY GPIB PCB...
  • Page 20 MAJOR ASSEMBLIES REPLACEABLE LOCATION DIAGRAM PARTS MENU PCB ASSEMBLY SIGNAL CHANNEL CRT MONITOR ASSEMBLY MOTHERBOARD POWER SUPPLY ASSEMBLY Figure 2-2. 54XXA Major Assemblies Location Diagram (Bottom View) 54XXA MM...
  • Page 21 Chapter 3 Troubleshooting Table of Contents INTRODUCTION ......3-3 RECOMMENDED TEST EQUIPMENT ... . 3-3 POWER-UP AND SELF TEST DIAGNOSTICS .
  • Page 22 Many of the troubleshooting procedures presented in this chapter re- quire the removal of instrument covers to gain access to printed circuit assemblies and other major assemblies. WARNING Hazardous voltages are present inside the instru- ment when ac line power is connected. Turn off the instrument and remove the line cord before remov- ing any covers or panels.

  • Page 23: Introduction

    Chapter 3 Troubleshooting INTRODUCTION This chapter provides information for troubleshooting 54XXA Scalar Measurement Systems. The troubleshooting operations presented in this chapter support fault isolation down to a replaceable subassembly. (Remove and replace procedures for major 54XXA assemblies are con- tained in Chapter 5.) RECOMMENDED TEST The recommended test equipment for the troubleshooting operations EQUIPMENT...

  • Page 24: Power-Up And Self Test Diagnostics

    POWER-UP AND SELF TEST DIAGNOSTICS TROUBLESHOOTING Calibration After self test, and prior to starting normal opera- Errors tion, the 54XXA performs an internal frequency lock calibration. These calibrations are also performed pe- riodically during normal operation. If a frequency calibration test fails, one or more “calibration error” messages will be displayed along with the FAILED TESTS display (example: fails het band 500 miss);...
  • Page 25 SELF-TEST TROUBLESHOOTING ERROR MESSAGES Table 3-1. Error Messages and Front Panel LED Indicators for Power-Up/Self Test Errors Condition/Fault Associated Front Panel LED Recommended Action CPU ASM test running HARDCOPY PRINTER PRINTER LED normally flashes during Self Test. A6 PERSONALITY fail HARDCOPY PLOTTER Replace A6 PCB *.
  • Page 26 DISPLAYED ERROR MESSAGES TROUBLESHOOTING Tables 3-2a & 3-2b. Displayed Error Message Headings and Message Text for Calibration Related Faults/Errors 3-2a 3-2b ERROR MESSAGE HEADINGS* ERROR MESSAGE TEXT* Heading Category/Type Message Meaning GENERAL Major errors no 500 500 MHz markers cannot be found during GENERAL test START- Calibration of START DAC (using...
  • Page 27 CALIBRATION RELATED TROUBLESHOOTING ERROR CODES Table 3-3. Error Codes for Calibration Related Faults/Errors (1 of 2) Calibration Refer Error Description Error Code to Table: General, no 500 MHz or 75 MHz markers START DAC main band, 500 MHz or 75 MHz marker(s) missing; or, top or bottom frequency(s) not correctly set START DAC main band, 1st MHz markers (top) wrong START DAC main band, 500 MHz or 75 MHz marker size error...
  • Page 28 CALIBRATION RELATED ERROR CODES TROUBLESHOOTING Table 3-3. Error Codes for Calibration Related Faults/Errors (2 of 2) Calibration Refer Error Description Error Code to Table: mb chan2 error, multiple slow lock fail hb chan1 error, multiple slow lock fail hb chan2 error, multiple slow lock fail lb chan1 error, 25 MHz slow lock fail lb chan2 error, 25 MHz slow lock fail mb chan1 error, 25 MHz slow lock fail...

  • Page 29: Troubleshooting Tables

    TROUBLESHOOTING TROUBLESHOOTING TABLES Table 3-4. Error Messages 201, 202, 206, 210, 213, 215, 217, 219, 221, or 223 (1 of 1) ERROR MESSAGES 201, 202, 206, 210, 213, 215, 217, 219, 221, or 223 Step 1. Perform Self Test and note all error messages. Then perform marker adjustment procedure — Chapter 6, paragraph 6-6.
  • Page 30 TROUBLESHOOTING TABLES TROUBLESHOOTING Table 3-5. Error Messages 203, 204, 207, or 208 (1 of 1) ERROR MESSAGES 203, 204, 207, or 208 Step 1. Perform Self Test and note all error messages. Then perform marker adjustment procedure — Chapter 6, paragraph 6-6. QUESTION: Is error message gone? YES: Problem is cleared.
  • Page 31 TROUBLESHOOTING TROUBLESHOOTING TABLES Table 3-6. Error Messages 205, 209, 211, 212, 214, 216, 218, 220, 222, 224, or 231 through 248 (1 of 2) ERROR MESSAGES 205, 209, 211, 212, 214, 216, 218, 220, 222, 224, or 231 through 248 Step 1.
  • Page 32 TROUBLESHOOTING TABLES TROUBLESHOOTING Table 3-6. Error Messages 205, 209, 211, 212, 214, 216, 218, 220, 222, 224, or 231 through 248 (2 of 2) Step 6. Replace 500 MHz Marker module. (Refer to Chapter 5, Figures 5-6 through 5-9, as appropriate.) Then perform marker adjustment procedure —...
  • Page 33 TROUBLESHOOTING TROUBLESHOOTING TABLES Table 3-7. Error Messages 225 thru 230 (1 of 1) ERROR MESSAGES 225 thru 230 Step 1. Perform Self Test and note all error messages. Then perform marker adjustment procedure — Chapter 6, paragraph 6-6. QUESTION: Is error message gone? YES: Problem is cleared.
  • Page 34 TROUBLESHOOTING TABLES TROUBLESHOOTING Table 3-8. RF Deck Problems – Models 5407A, 5409A, or 5411A (1 of 2) RF Deck Problems – Models 5407A, 5409A, or 5411A Step 1. Reset instrument and measure power into the step attenuator, if installed. If no attenuator, go to next step.
  • Page 35 TROUBLESHOOTING TROUBLESHOOTING TABLES Table 3-8. RF Deck Problems – Models 5407A, 5409A, or 5411A (2 of 2) Step 6. Measure the signal and bias voltages to the YIG oscillator per Table 3-9. QUESTION: Are the voltages correct? YES: Replace YIG oscillator (refer to Chapter 5, paragraph 5-12); then go to step 3.
  • Page 36 TROUBLESHOOTING TABLES TROUBLESHOOTING Table 3-10. RF Deck Problems – Models 5428A, 5430A, 5431A, or 5436A (1 of 2) RF Deck Problems – Models 5428A, 5430A, 5431A, or 5436A Step 1. Reset instrument and measure power into the step attenuator, if installed. If no attenuator, go to next step.
  • Page 37 TROUBLESHOOTING TROUBLESHOOTING TABLES Table 3-10. RF Deck Problems – Models 5428A, 5430A, 5431A, or 5436A (2 of 2) Step 6. Measure the signal and bias voltages to the Control Modulator module per Table 3-11. QUESTION: Are the voltages correct? YES: Replace the Control Modulator module (refer to Chapter 5, paragraph 5-12).
  • Page 38 TROUBLESHOOTING TABLES TROUBLESHOOTING Table 3-12. RF Deck Problems Below 2 GHz – Models 5417A and 5447A (1 of 3) RF Deck Problems Below 2 GHz – Models 5417A and 5447A Step 1. Reset instrument. QUESTION: Is the RF output problem only below 2 GHz? YES: Go to next step.
  • Page 39 TROUBLESHOOTING TROUBLESHOOTING TABLES Table 3-12. RF Deck Problems Below 2 GHz – Models 5417A and 5447A (2 of 3) Step 5. Perform ALC adjustment — Chapter 6, paragraph 6-8. QUESTION: Is output leveled? YES: Problem is cleared. Replace the Down Converter module (refer to Chapter 5, paragraph 5-12). Step 6.
  • Page 40 TROUBLESHOOTING TABLES TROUBLESHOOTING Table 3-12. RF Deck Problems Below 2 GHz – Models 5417A and 5447A (3 of 3) Step 8. Replace the Switched Filter assembly (refer to Chapter 5, Figures 5-7 and 5-9, as appropriate). QUESTION: Is there output power across the band? YES: Problem is cleared.
  • Page 41 TROUBLESHOOTING TROUBLESHOOTING TABLES Table 3-15. RF Deck Problems Greater Than 2 GHz, Models 5417A, 5419A, 5437A, or 5447A (1of 2) RF Deck Problems Greater Than 2 GHz, Models 5417A, 5419A, 5437A, or 5447A Step 1. Reset instrument and measure power into the step attenuator, if installed. If no attenuator, go to next step.
  • Page 42 TROUBLESHOOTING TABLES TROUBLESHOOTING Table 3-15. RF Deck Problems Greater Than 2 GHz, Models 5417A, 5419A, 5437A, or 5447A (2 of 2) Step 5. Perform YIG driver adjustment — Chapter 6, paragraph 6-4, and ALC adjustment — Chapter 6, paragraph 6-8. QUESTION: Was adjustment procedure successful? YES: Problem is cleared.
  • Page 43 TROUBLESHOOTING TROUBLESHOOTING TABLES Table 3-16. ALC Leveling Problems (1of 1) ALC Leveling Problems Step 1. Reset instrument. QUESTION: Is leveling problem below 2 GHz? YES: Refer to Table 3-8, or Table 3-12, as appropriate (RF deck problems). Go to next step. Step 2.
  • Page 44 TROUBLESHOOTING TABLES TROUBLESHOOTING Table 3-17. Step Attenuator Problems (1of 2) Step Attenuator Problems Step 1. Reset instrument. Verify drive signals for each attenuator step per Table 3-18 or 3-19, as appropriate for model. QUESTION: Are drive signals correct? YES: Replace the step attenuator assembly. Replace the A7 Central Processor PCB.
  • Page 45 TROUBLESHOOTING TROUBLESHOOTING TABLES Table 3-17. Step Attenuator Problems (2of 2) Table 3-19. Step Attenuator Drive Signals for Microwave Band Models 5417A through 5447A Attenuator Step A4 Motherboard Connector J6 Pin No. Not used Not used 7 & 8 Not used Not used Not used ∗...
  • Page 46 TROUBLESHOOTING TABLES TROUBLESHOOTING Table 3-20. CRT Monitor Problems (1of 2) CRT Monitor Problems Step 1. Switch unit off, then back on. QUESTION: Is display normal? YES: Problem is cleared. Go to next question. QUESTION: Is there any display at all? YES: Go to step 3.
  • Page 47 TROUBLESHOOTING TROUBLESHOOTING TABLES Table 3-20. CRT Monitor Problems (2of 2) Step 5. Replace the A8 Graphics Processor PCB (refer to Chapter 5, paragraph 5-3). QUESTION: Is display normal? YES: Problem is cleared. Go to next step. Step 6. Replace the A7 Central Processor PCB (refer to Chapter 5, paragraph 5-3). QUESTION: Is display normal? YES: Problem is cleared.
  • Page 48 TROUBLESHOOTING TABLES TROUBLESHOOTING Table 3-21. Power Supply Problems (1of 1) Power Supply Problems Step 1. Switch unit off and wait five minutes for capacitors to discharge. Clean the rear panel fan filter, check the fuse and verify the voltage selector setting. Then, turn unit back on. QUESTION: Is unit operating properly? YES: Problem is cleared.
  • Page 49 TROUBLESHOOTING TROUBLESHOOTING TABLES Table 3-23. Measurement Channel Problems (1of 1) Measurement Channel Problems Step 1. Initiate 54XXA Self Test. QUESTION: Does Failed Test message for A3 PCB or A5 PCB occur? YES: If A3 PCB error only, replace A3 PCB. If A5 error is indicated, replace A5 PCB.
  • Page 50 Chapter 4 Functional Description Table of Contents INTRODUCTION ......4-3 OVERVIEW OF 54XXA SERIES SYSTEMS ..4-3 54XXA MAJOR FUNCTIONAL BLOCKS .
  • Page 51 A6 ALC/FREQUENCY INSTRUCTION PCB ..4-15 ALC Circuit Operation ....4-16 ALC Circuit Groups ....4-16 Power Level Set Circuits .
  • Page 52 Channel Input Circuits ....4-30 Input Amplifier Circuits ....4-30 Variable Gain Amplifier Circuits ..4-30 Auto-Zero Circuits .

  • Page 53: Introduction

    Chapter 4 Functional Description INTRODUCTION This chapter provides descriptions of the functional operation of the major assemblies contained in each of the models of the 54XXA series Scalar Measurement Systems. The operation of each of the major cir- cuit blocks is described so that the reader may better understand the function of the major assembly as part of the overall operation of the 54XXA.

  • Page 54: 54Xxa Major Functional Blocks

    (Table 4-1) and by the SWR Auto- tester and/or RF detector(s) used with the analyzer section of the 54XXA. The frequency ranges and characteristics of WILTRON SWR Autotesters and RF detectors for series 54XXA systems are described fully in the 54XXA Operation Manual.

  • Page 55: 54Xxa User Interfaces

    FUNCTIONAL 54XXA MAJOR DESCRIPTION FUNCTIONAL BLOCKS 54XXA User The standard operator interfaces to the 54XXA cen- Interfaces tral processor are the front panel control keys and the function menus displayed on the internal CRT monitor. The control keys, indicator LED’s, and asso- ciated circuitry are located on the A1 and A2 PCB’s.

  • Page 56: Processor Sub-System

    54XXA MAJOR FUNCTIONAL FUNCTIONAL BLOCKS DESCRIPTION Graphics The graphics processor circuitry located on the Processor A8 Graphics System Processor PCB generates the Sub-System various elements that make up the screen display presented on the internal VGA monochrome moni- tor. Similarly, it produces the screen display signals that drive an external VGA color monitor.

  • Page 57: Measurement Channel Signal Processing

    FUNCTIONAL 54XXA MAJOR DESCRIPTION FUNCTIONAL BLOCKS Measurement The low-level analog signals from the external SWR Channel Autotester(s) and/or detectors used with the 54XXA Signal Proc- are fed from the front panel input connectors to the A3 Signal Channel PCB. This PCB is positioned essing behind the input connectors and underneath the RF deck in a screened metal cage.
  • Page 58 A7 CENTRAL FUNCTIONAL PROCESSOR PCB DESCRIPTION panel line voltage module connects it directly to the power supply module. A7 CENTRAL The A7 PCB contains the central processor circuits , driver circuits for PROCESSOR PCB the (optional) 70 dB attenuator, and for the Switched Filter that is part of the RF Deck of models 5417A, 5419A, 5437A, and 5447A.

  • Page 59: A7 Central Processor Pcb

    FUNCTIONAL A7 CENTRAL DESCRIPTION PROCESSOR PCB Attenuator A control latch and four bi-polar output circuits com- Driver prise the drive circuits for the (optional) 70 dB step Circuit attenuator located on the RF deck. Each output cir- cuit provides a 24V reversible drive signal for one of the four stages of the attenuator.

  • Page 60: Switched Filter Control Circuit

    A8 GRAPHICS SYSTEM FUNCTIONAL PROCESSOR PCB DESCRIPTION Switched The Switched Filter Control latch provides the five Filter drive signals for the Switched Filter located on the Control RF deck (used on models 5417A, 5419A, 5437A, and 5447A). This latch is controlled by the central micro- Circuit processor via the internal data and address buses on the A7 PCB.
  • Page 61 FUNCTIONAL A8 GRAPHICS SYSTEM DESCRIPTION PROCESSOR PCB The video clock oscillator and associated divider circuits produce the 6 MHz video clock sig- nal,VCLK. This signal is used to establish the rate that the video information is clocked from the GSP memory to the video output circuits. NOTE For troubleshooting, all program- related cycles should be observed syn-...

  • Page 62: Gsp Controller Operation

    A8 GRAPHICS SYSTEM FUNCTIONAL PROCESSOR PCB DESCRIPTION Data “Pipe” — two latches form a data pipe that allows direct communication from the A7 central processor to/from the GSP processor via the GSP Data Bus (Figure 4-3). Video/Program Memory — four 256K x 4 Video Dynamic RAMs (VRAMs) comprise the memory for the GSP subsystem.
  • Page 63 FUNCTIONAL A8 GRAPHICS SYSTEM DESCRIPTION PROCESSOR PCB A preliminary step performed by the program is the setup of timing information for the video output sig- nals. This operation places certain control codes into the A8 PCB internal registers. (At execution time, the contents of these registers are processed in the same manner as memory location data.) These codes control internal clock dividers that generate the re-...

  • Page 64: Printer Interface Operation

    A8 GRAPHICS SYSTEM FUNCTIONAL PROCESSOR PCB DESCRIPTION Printer The GSP processor sends formatted printer output Interface Op- data and control signals to the printer interface cir- eration cuits via the GSP data bus. The printer interface con- troller chip provides the data strobe that clocks the output data from the GSP bus into the data buffer/ latch (Figure 4-3).

  • Page 65: A6 Alc/Frequency Instruction Pcb

    FUNCTIONAL ALC/FREQUENCY DESCRIPTION INSTRUCTION PCB A6 ALC/FREQUENCY The circuitry contained on the A6 ALC/Frequency Instruction PCB INSTRUCTION PCB (Figure 4-4) generates control signals that perform the following functions: Sets the RF power output level of the 54XXA internal source to the value instructed by the A7 Central Processor.

  • Page 66: Alc Circuit Operation

    ALC/FREQUENCY FUNCTIONAL INSTRUCTION PCB DESCRIPTION ALC Circuit The ALC circuits control the RF power output level Operation and flatness of the internal source. These circuits re- ceive instructions and data from the A7 Central Proc- essor PCB and convert them into a voltage that represents the desired output level.

  • Page 67: Control Modulator Driver Circuits

    FUNCTIONAL ALC/FREQUENCY DESCRIPTION INSTRUCTION PCB The output voltages from the two DAC’s are sum- med with the feedback voltage from the internal (or external) ALC detectors to produce the ALC LEVEL control signal. This signal represents the desired RF output level and is the input to the Control Modula- tor and Down Converter modulator driver circuits.

  • Page 68: Internal Leveling Circuits

    ALC/FREQUENCY FUNCTIONAL INSTRUCTION PCB DESCRIPTION Internal Lev- The source RF output is leveled by a closed feedback eling Circuits loop. For microwave band models 5417A through 5447A, the ALC feedback signal is produced by a di- rectional detector located on the RF deck. For mod- els 5407A, 5409A, and 5411A, (and for models 5417A and 5447A at output frequencies below 2.0 GHz), the feedback signal is produced by a detector located in...

  • Page 69: Quiet" Data Bus Circuits

    FUNCTIONAL ALC/FREQUENCY DESCRIPTION INSTRUCTION PCB “Quiet” Data This bus is used to transfer data between the A6 Bus Circuits PCB data latch circuits and the Frequency Instruc- tion DAC’s and Power Level Control DAC’s (Fig- ure 4-4). The quiet data bus is buffered from the A7 Central Processor Data Bus to insulate these circuits from noise on the main bus.

  • Page 70: Frequency Instruction Circuits Operation

    ALC/FREQUENCY FUNCTIONAL INSTRUCTION PCB DESCRIPTION Frequency The frequency instruction circuits located on the A6 Instruction PCB control the frequency of the 54XXA RF output Circuits Op- signal. These circuits receive instructions and data eration from the A7 Central Processor PCB and convert them into control signals for the YIG-tuned oscillator main coil and FM coil drive circuits that are located on the A5 YIG Driver/ Channel Interface PCB (Fig-...

  • Page 71: Width Dac Circuits

    FUNCTIONAL ALC/FREQUENCY DESCRIPTION INSTRUCTION PCB WIDTH DAC The input to the WIDTH DAC is the ramp signal out- Circuits put by the RAMP DAC. The WIDTH DAC output is a ramp signal with a magnitude that is scaled by the data it receives from the A7 Central Processor.

  • Page 72: 500Mhz And 25 Mhz Markers Read Circuits

    ALC/FREQUENCY FUNCTIONAL INSTRUCTION PCB DESCRIPTION The output of the ERROR DAC circuit is a DC volt- age in the range of –10 to +10V. This signal is fed through a summing resistor to the input of the FM Coil Sweep signal output circuit, thereby controlling the DC component of the composite FM Coil Sweep signal.
  • Page 73 FUNCTIONAL ALC/FREQUENCY DESCRIPTION INSTRUCTION PCB -10V RAMP OUTPUT RAMP TO REAR PANEL SWEEP SIGNAL QUIET TO MARKER CIRCUITS DATA BUS** (RF DECK) YIG MAIN COIL WIDTH CONTROL SIGNAL (TO A5 PCB) FREQ SWEEP SIGNAL -10V TO ALC CIRCUITS* CENTER -10V YIG FM COIL CONTROL SIGNAL (TO A5 PCB)

  • Page 74: A5 Yig Driver/Signal Channel Interface Pcb

    A5 YIG DRIVER/ FUNCTIONAL SIGNAL CHANNEL INTERFACE PCB DESCRIPTION A5 YIG DRIVER/ There are two YIG-tuned oscillator coil driver circuits located on the SIGNAL CHANNEL A5 PCB: the Main Coil Driver and the FM Coil Driver. These circuits INTERFACE PCB receive the YIG Main Coil and FM Coil control signals from the A6 ALC/Frequency Instruction PCB and convert them into the drive cur- rents for the YIG tuning coils.

  • Page 75: Main Coil Driver Circuit

    FUNCTIONAL A5 YIG DRIVER/ DESCRIPTION SIGNAL CHANNEL INTERFACE PCB Main Coil Figure 4-8 is a block diagram showing the YIG Main Driver Coil driver and FM Coil driver circuits. The input to Circuit the main coil driver circuit is the Main Coil Control signal from the A6 PCB.

  • Page 76: Fm Coil Driver Circuit

    A5 YIG DRIVER/ FUNCTIONAL SIGNAL CHANNEL INTERFACE PCB DESCRIPTION When the 54XXA is sweeping using the FM coil, the rapidly changing field causes a voltage to be induced in the main coil. This effect (and the action of the low-pass filter) causes a frequency shift to occur. To counteract this, a linearization transformer is used to couple some of the FM coil drive signal into the main coil driver circuit.

  • Page 77: Signal Channel Interface Circuits

    FUNCTIONAL A5 YIG DRIVER/ DESCRIPTION SIGNAL CHANNEL INTERFACE PCB Signal Figure 4-9 is a block diagram of the signal channel Channel interface circuits located on the A5 PCB. The major Interface circuit blocks that comprise these circuits are: Circuits Sample-and-Hold Analog-to-Digital Converter Detector Recognition Address Decode...

  • Page 78: Detector Recognition Circuits

    A5 YIG DRIVER/ FUNCTIONAL SIGNAL CHANNEL INTERFACE PCB DESCRIPTION Detector Rec- The A, B, and R Detector Sensed signals from the ognition Cir- A3 Signal Channel PCB are buffered and then cuits stored in a data latch that outputs to the quiet data bus.
  • Page 79 FUNCTIONAL A5 YIG DRIVER/ DESCRIPTION SIGNAL CHANNEL INTERFACE PCB SAMPLE ANALOG A/B HOLD CIRCUIT ANALOG TO DATA DIGITAL LATCHES CONVERTER SAMPLE ANALOG R HOLD FROM A3 CIRCUIT SIGNAL CHANNEL PCB DETECTOR SENSE A, B, R INTERRUPT CODE DATA TRANS- QUIET DATA BUS CEIVERS ADDRESS TO/FROM...

  • Page 80: Channel Input Circuits

    A3 SIGNAL FUNCTIONAL CHANNEL PCB DESCRIPTION A3 SIGNAL CHANNEL The standard A3 Signal Channel PCB has two measurement signal in- puts, A and B. The signals from these inputs are multiplexed together by an input switching circuit and then fed to an amplifier chain (Figure 4-13 on page 4-35).

  • Page 81: A3 Signal Channel Pcb

    FUNCTIONAL A3 SIGNAL DESCRIPTION CHANNEL PCB Auto-Zero When the amplifier chain is operated at high gain Circuits settings, the errors due to overall amplifier DC offset and wide band noise from the internal RF source must be eliminated. An autozero circuit is used to perform this function.

  • Page 82: Smoothing Circuits

    A3 SIGNAL FUNCTIONAL CHANNEL PCB DESCRIPTION Smoothing The output signal from the amplifier chain contains Circuits appreciable high frequency noise when processing low level input signals. To reduce this noise, five lev- els of filtering can be applied by the A3 PCB smooth- ing circuit.

  • Page 83: Log Conformity Circuits

    A3 SIGNAL DESCRIPTION CHANNEL PCB Log Conform- WILTRON RF Detectors and Autotesters have a ity Circuits built-in resistance that is set at the factory to match the log characteristic of the detector diode used. The Log Conformity Sense circuits (Figure 4-12) convert this resistance value into a voltage value.

  • Page 84: Temperature Sense Circuits

    A3 SIGNAL FUNCTIONAL CHANNEL PCB DESCRIPTION The output from each log conformity sense circuit is also fed to an associated comparator circuit. The out- put of the comparator is used as a status signal that indicates that a RF detector or Autotester is con- nected to the associated input.
  • Page 85 FUNCTIONAL A3 SIGNAL DESCRIPTION CHANNEL PCB AMPLIFIER CHAIN A IN FROM A LOG INPUT INPUT A SMOOTHING A TEMP SWITCHING FILTER A/B CIRCUITS ANALOG B IN OUTPUT SIGNAL A/B FROM MULTIPLEXER B LOG INPUT B CIRCUITS B TEMP TO A5 CHANNEL AUTOZERO INTERFACE...

  • Page 86: A1, A2, & A10 Front Panel Pcbs

    A1, A2, & A10 FUNCTIONAL FRONT PANEL PCB’s DESCRIPTION A1, A2, & A10 The Front Panel Assembly circuitry is contained on three printed FRONT PANEL PCB’s circuit boards: the A1 Front Panel PCB, the A2 Front Panel Interface PCB, and the A10 Menu PCB Assembly (Figure 4-14). These circuits form a subsystem that performs the following functions: Detects Control Key closures Generates Interrupt for key closure...

  • Page 87: Keyboard Interface Circuits

    FUNCTIONAL A1, A2, & A10 DESCRIPTION FRONT PANEL PCB’s The A10 Menu PCB contains the six control key switches and one LED indicator that are located on the lower portion of the front panel. (The POWER switch is a separate assembly.) These switches are membrane type switches identical to those on the A1 PCB.

  • Page 88: Led Indicator Latch Circuits

    A1, A2, & A10 FUNCTIONAL FRONT PANEL PCB’s DESCRIPTION The switch controller/decoder circuit on the A2 PCB sequentially pulses the eight X-lines and also moni- tors each of the eight Y-lines for the presence of pulses. A pulse detected on a Y-line signifies a switch closure, which causes the controller/decoder circuit to send a Control Key Interrupt signal to the A7 Central Processor.

  • Page 89: Cpu Interface Circuits

    FUNCTIONAL A1, A2, & A10 DESCRIPTION FRONT PANEL PCB’s The pulse rate of the CW and CCW pulse trains is determined by the rate of knob rotation. These sig- nals are fed to the Knob Interrupt Circuits, which produce the CW and CCW Interrupt signals that are sensed by the A7 Central Processor.

  • Page 90: A9 & A16 Power Supply Pcb's

    A9 & A16 FUNCTIONAL POWER SUPPLY PCB’s DESCRIPTION 4-10 A9 & A16 POWER The 54XXA power supply circuits consist of a half-bridge line rectifier SUPPLY PCB’s coupled to a high efficiency DC/DC switching type power converter. These circuits produce the following output voltages: +5 V High Current Supply +12V High Current regulated supply +12V Low Current regulated supply...

  • Page 91: Power Supply Converter Pcb Circuits

    FUNCTIONAL A9 & A16 DESCRIPTION POWER SUPPLY PCB’s Power The major circuits located on the A16 Power Supply Supply Converter PCB are: Converter Switching Transistors PCB Circuits Over-Current Sense Output Voltage Transformer Output Rectifiers Power The switches contained within the line voltage selec- Supply tor module configure the primary windings of the Circuits Op-...
  • Page 92 A9 & A16 FUNCTIONAL POWER SUPPLY PCB’s DESCRIPTION The main input to the Control Amplifier is the +5V output sense line. Any change in the +5V output cause the control amplifier to force the PWM to change the duty cycle of the drive signals so that the +5V power supply output is regulated back to +5V.
  • Page 93 FUNCTIONAL POWER SUPPLY CIRCUITS DESCRIPTION BLOCK DIAGRAM LINE VOLTAGE A9 POWER SUPPLY MOTHERBOARD PCB A16 POWER SUPPLY CONVERTER PCB + STARTUP SELECTOR MODULE (REAR PANEL) + 12V + 12V2 TO REAR REGULATOR PANEL FAN PRIMARY RECTIFIER + 5V + 5V CIRCUIT RECTIFIER SWITCHES...

  • Page 94: A4 Motherboard Pcb

    FUNCTIONAL DESCRIPTION A4 MOTHERBOARD PCB 4-11 A4 MOTHERBOARD The Motherboard PCB provides interconnection between all the PCBs and assemblies in the 54XXA. The motherboard connects directly to the following: A5 YIG Driver/Signal Channel Interface PCB A6 ALC/Frequency Instruction PCB A7 Central Processor/GPIB PCB A8 Graphics System Processor PCB The motherboard distributes the various power supply voltages throughout the 54XXA.

  • Page 95: Rf Deck Assembly

    RF DECK FUNCTIONAL ASSEMBLIES DESCRIPTION 4-12 RF DECK ASSEMBLY The RF deck assembly contains the components that generate CW and swept frequency RF signals and route these signals to the front panel RF OUTPUT connector. The RF decks used in the 54XXA series are de- signed around a single YIG-tuned oscillator configuration.
  • Page 96 FUNCTIONAL RF DECK DESCRIPTION ASSEMBLIES Table 4-3. Common RF Deck Component Descriptions YIG-tuned Oscillator Each RF deck assembly contains a single YIG-tuned oscillator. The YIG-tuned oscillator generates high-power RF output signals that have low broadband noise and low spurious content. The YIG-tuned oscillator is driven by the FM and Main tuning coil currents from the A5 YIG Driver PCB.

  • Page 97: Frequency Control And Source-Lock

    RF DECK FUNCTIONAL ASSEMBLIES DESCRIPTION Frequency The A7 Central Processor controls the output fre- Control and quency of the YIG-tuned Oscillator through the fre- Source-Lock quency instruction circuits located on the A6 ALC/ Frequency Instruction PCB. These circuits convert the digital instructions from the central processor into analog control signals for the YIG main coil and FM coil driver circuits located on the A5 YIG Driver/ Channel Interface PCB.
  • Page 98 FUNCTIONAL RF DECK DESCRIPTION ASSEMBLIES The 500 MHz VCO/Power Amplifier module (Fig- ure 4-18) also produces a 25 MHz output using the divider circuitry in the Divider module. This 25 MHz signal goes to the 25 MHz Marker Module. There it is amplified and applied to a SRD producing a 25 MHz comb signal.

  • Page 99: Rf Decks For Models 5417A/ 5419A

    RF DECK FUNCTIONAL ASSEMBLIES DESCRIPTION RF Decks The RF decks of microwave band models 5417A for Models (10 MHz to 8.6 GHz) and 5419A (2.0 to 8.6 GHz) are 5417A/ 5419A very similar. However, model 5417A contains two ad- ditional components, a Down Converter and a 25 MHz Marker Generator.
  • Page 100 FUNCTIONAL MODELS 5417A/5419A DESCRIPTION RF DECK BLOCK DIAGRAM SWITCH FILTER OSCILLATOR DIRECTIONAL CONTROL MODULATOR 2.0-8.6 GHz 3.5 GHz LPF DETECTOR 2.0-8.6 GHz 0.01 to 8.6 GHz 70 dB STEP MAIN 6 GHz LPF ATTENUATOR OUTPUT 8 GHz LPF MOD CONTROL (OPTIONAL) 0.01-2.0 GHz FROM...
  • Page 101 FUNCTIONAL RF DECK DESCRIPTION ASSEMBLIES A portion of the RF output signal from the down con- verter is detected (by the directional detector), and sent to the ALC circuitry on the A6 PCB. This is the feedback signal for the internal ALC function. The directional detector also contains a built-in ther- mistor that outputs a resistance representing the de- tector’s temperature.
  • Page 102 RF DECK FUNCTIONAL ASSEMBLIES DESCRIPTION RF Decks The RF decks of models 5428A (8 to 12.4 GHz), for Models 5430A (12.4 to 20 GHz), 5431A (10 to 16 GHz), and 5428A, 5430A, 5436A (17 to 26.5 GHz) have an identical configura- 5431A, and tion.
  • Page 103 FUNCTIONAL MODELS 5428A, 5430A, 5431A, AND 5436A DESCRIPTION RF DECK BLOCK DIAGRAM DIRECTIONAL OSC ILLATOR CONTROL MODULATOR DETECTOR 70 dB STEP MAIN AT TEN UATOR OUTPUT MOD CONTROL (OPTIONAL) FROM MOD BIAS A6 PCB OUT PUT M O D E L F R E Q U E N C Y LEVEL CONTROL...

  • Page 104: Rf Decks For Models 5437A And 5447A

    FUNCTIONAL RF DECK DESCRIPTION ASSEMBLIES RF Decks for The RF decks of microwave band models 5437A (2.0 Models 5437A to 20 GHz) and 5447A (10 MHz to 20 GHz) are very and 5447A similar. However, model 5447A contains two addi- tional components, a Down Converter and a 25 MHz Marker Generator.
  • Page 105 RF DECK FUNCTIONAL ASSEMBLIES DESCRIPTION Inside the marker generator, the output from the lo- cal 75 MHz crystal oscillator is split into two paths. In one path, the 75 MHz signal is amplified, then goes to the sampler assembly. In the sampler assem- bly, the step recovery diode produces a 75 MHz comb signal that drives the sampling diodes.
  • Page 106 FUNCTIONAL MODELS 5437A AND 5447A DESCRIPTION RF DECK BLOCK DIAGRAM SWITCHED FILTER ASSEMBLY CONTROL MODULATOR SWITCH FILTER SECTION SECTION 3.3 GHz LPF 5.5 GHz LPF DIRECTIONAL DETECTOR OSCILLATOR 2.0-20.0 GHz 8.4 GHz LPF 0.01 to 20.0 GHz 70 dB STEP ATTENUATOR OUTPUT MAIN...
  • Page 107 FUNCTIONAL RF DECK DESCRIPTION ASSEMBLIES The RF signal output from the switched filter is sent to the Directional Detector for transfer to the RF OUTPUT connector. A portion of the RF output sig- nal is detected and coupled out as feedback to the ALC circuitry on the A6 PCB.

  • Page 108: Rf Decks For Models 5407A, 5409A, And 5411A

    RF DECK FUNCTIONAL ASSEMBLIES DESCRIPTION RF Decks The RF decks of the models 5407A (1.0 MHz to for Models 1.0 GHz), 5409A (1.0 MHz to 2.0 GHz), and 5411A 5407A, 5409A, (1.0 MHz to 3.0 GHz) contain identical components. and 5411A Refer to Figure 4-21 during the following functional description.
  • Page 109 FUNCTIONAL MODELS 5407A, 5409A, AND 5411A DESCRIPTION RF DECK BLOCK DIAGRAM OSCILLATOR DOWN CONVERTER 10-13 GHz ISOLATOR CONTROL 70 dB STEP MAIN ATTENUATOR OUTPUT MODULATOR BIAS (OPTIONAL) 10 GHz MOD CONTROL LEVEL FROM A6 PCB CONTROL TO A6 PCB 75 MHz/25 MHz MARKER GENERATOR 25 MHz 25 MHz MARKER...
  • Page 110 FUNCTIONAL RF DECK DESCRIPTION ASSEMBLIES Within the down converter, a portion of the down- converted RF signal is picked off for input to the 75 MHz/25 MHz Marker Generator. Inside the marker generator, the 75 MHz crystal oscillator out- put is split into two paths. In one path, the 75 MHz signal is amplified, then goes to the sampler assem- bly.
  • Page 111 Chapter 5 Removal and Replacement Procedures Table of Contents INTRODUCTION ......5-3 REMOVING AND REPLACING THE CHASSIS COVERS . . 5-4 REMOVING AND REPLACING THE A5, A6, A7 AND A8 PCB’s .

  • Page 112: Introduction

    Chapter 5 Removal and Replacement Procedures INTRODUCTION The disassembly procedures presented in this chapter describe how to gain access to the major 54XXA assemblies and parts for troubleshoot- ing or replacement. WARNING Hazardous voltages are present inside the instrument when ac line power is connected. Turn off the instru- ment and remove the line cord before removing any covers or panels.

  • Page 113: Removing And Replacing The Chassis Covers

    CHASSIS REMOVAL AND COVERS REPLACEMENT PROCEDURES REMOVING AND Adjustment and troubleshooting operations require removal of the top REPLACING THE cover. Replacement of some 54XXA assemblies and parts require re- CHASSIS COVERS moval of all covers. The following procedures describe this process. Preliminary Disconnect the power cord from the unit.
  • Page 114 REMOVAL AND STATIC SENSITIVE COMPONENT REPLACEMENT PROCEDURES HANDLING PROCEDURES Do not touch exposed contacts on Do not slide static sensitive Do not handle static sensitive any static sensitive component. component across any surface. components in areas where the floor or work surface covering is capable of generating a static charge.

  • Page 115: And A8 Pcb's

    A5, A6, A7 REMOVAL AND AND A8 PCB’s REPLACEMENT PROCEDURES REMOVING AND This paragraph provides instructions for removing and replacing the REPLACING THE A5, A5, A6, A7 and A8 PCB’s, which are located underneath the cover of A6, A7 AND A8 PCB’s the card cage.
  • Page 116 REMOVAL AND REPLACEMENT PROCEDURES CHANNEL PCB main deck (Figure 5-2). Set screws and washers aside. Step 5 Remove the two nuts that fasten the in- put connector bracket to the front panel (see figure), and set aside. Step 6 Gently lift the rear edge of the A3 PCB and pull toward the rear of the 54XXA to remove.

  • Page 117: Removing And Replacing The Front Panel Assembly

    FRONT PANEL REMOVAL AND ASSEMBLY REPLACEMENT PROCEDURES REMOVING AND This paragraph provides instructions for removing and replacing the REPLACING THE FRONT front panel assembly of the 54XXA. PANEL ASSEMBLY Preliminary: Disconnect the power cord from the unit and re- move all four instrument covers as described in paragraph 5-2.

  • Page 118: Removing And Replacing The A1/A2 Pcb's

    REMOVAL AND A1/A2 FRONT REPLACEMENT PROCEDURES PANEL PCB’s REMOVING AND This paragraph provides instructions for removing and replacing the REPLACING THE A1 Front Panel PCB and A2 Front Panel Interface PCB. These PCB’s A1/A2 PCB’s are located immediately behind the front panel on the left side of the unit.

  • Page 119: Removing And Replacing The Power Supply Assembly

    POWER SUPPLY REMOVAL AND ASSEMBLY REPLACEMENT PROCEDURES REMOVING AND This paragraph provides instructions for removing and replacing the REPLACING THE D35370 Power Supply Assembly, which consists of the A9 Power Sup- POWER SUPPLY ply Motherboard PCB and the A16 Power Supply Converter PCB. The ASSEMBLY power supply assembly is removed/replaced as a complete unit.
  • Page 120 REMOVAL AND POWER SUPPLY REPLACEMENT PROCEDURES ASSEMBLY REMOVE THESE 2 SCREWS BOTTOM VIEW REMOVE THESE 2 SCREWS POWER SUPPLY MODULE LEFT SIDE VIEW REMOVE THESE 5 SCREWS Figure 5-3. Removing the Power Supply Assembly 54XXA MM 5-11...

  • Page 121: Removing And Replacing The Crt Monitor Assembly

    CRT MONITOR REMOVAL AND ASSEMBLY REPLACEMENT PROCEDURES REMOVING AND This paragraph provides instructions for removing and replacing the REPLACING THE CRT CRT Monitor Assembly, which consists of the CRT monitor unit and MONITOR ASSEMBLY mounting bracket. The CRT Monitor Assembly is removed/ replaced as a complete unit.

  • Page 122: Removing And Replacing The Rear Panel

    REMOVAL AND REAR REPLACEMENT PROCEDURES PANEL REMOVING AND This paragraph provides instructions for removing and replacing the REPLACING THE REAR 54XXA rear panel. This procedure is used to provide access to the PANEL HORIZONTAL OUTPUT and (optional) EXTERNAL ALC INPUT connec- tors and to the cooling fan for replacement.

  • Page 123: Removing And Replacing The Fan Assembly

    REMOVAL AND ASSEMBLY REPLACEMENT PROCEDURES 5-10 REMOVING AND This paragraph provides instructions for removing and replacing the REPLACING THE FAN rear panel cooling fan assembly. ASSEMBLY Preliminary: Disconnect the power cord from the unit and re- move the rear panel as described in paragraph 5-9. Procedure: Step 1 Disconnect the fan power cable at connec-...

  • Page 124: Removing And Replacing The Rf Deck Assembly

    REMOVAL AND REPLACEMENT PROCEDURES DECK 5-11 REMOVING AND This paragraph provides instructions for removing and replacing the REPLACING THE RF RF deck assembly, which is located on the left side of the chassis. Use DECK ASSEMBLY this procedure for gaining access to the RF deck components for re- moval and replacement.

  • Page 125: Rf Deck Component Location Diagrams

    REMOVAL AND DECK REPLACEMENT PROCEDURES 5-12 RF DECK There are six different configurations of the RF deck assembly. One COMPONENT configuration covers the RF models (5407A thru 5411A); the other five LOCATION configurations cover the Microwave Band models (5417A thru 5447A). DIAGRAMS Figures 5-6 through 5-11 show the component locations for these RF Decks;...
  • Page 126 REMOVAL AND RF DECK REPLACEMENT PROCEDURES REMOVAL Figure 5-5. RF Deck Removal/Replacement 54XXA MM 5-17...
  • Page 127 Models 5407A, 5409A, AND 5411A REMOVAL AND RF DECK PARTS LOCATION REPLACEMENT PROCEDURES 25/75 MHz MARKER DOWN GENERATOR OSCILLATOR CONVERTER ISOLATOR RF OUTPUT 70 dB STEP NOTE: WHEN OPTION 2 IS NOT INSTALLED, ATTENUATOR CONNECTOR RF CABLE CONNECTS DIRECTLY (OPTION 2) FROM RF OUTPUT CONNECTOR TO DOWN CONVERTER A4-J3...
  • Page 128 REMOVAL AND MODELS 5417A AND 5419A REPLACEMENT PROCEDURES RF DECK PARTS LOCATION SWITCHED RF DECK FILTER DISTRIBUTION *DOWN *25 MHz 25 MHz 500 MHz (BEHIND) PANEL ASSY. CONVERTER OSCILLATOR MARKER MARKER MODULE MARKER MODULE SAMPLER * 500 MHz VCO/POWER AMPLIFIER ASSY. DIVIDER OUTPUT MODULE...
  • Page 129 REMOVAL AND MODELS 5428A, 5430A, 5431A, AND 5436A REPLACEMENT PROCEDURES RF DECK PARTS LOCATION RF DECK DISTRIBUTION 25 MHz 500 MHz A4-J8 PANEL ASSY. OSCILLATOR MARKER MODULE MARKER MODULE SAMPLER * 500 MHz VCO/POWER AMPLIFIER ASSY. DIVIDER OUTPUT MODULE 70dB STEP DIRECTIONAL ATTENUATOR COUPLER...
  • Page 130 REMOVAL AND MODELS 5437A AND 5447A REPLACEMENT PROCEDURES RF DECK PARTS LOCATION MULTIBAND CONTROLLER PCB *MODEL 5447A ONLY 500 MHz 25 MHz 500 MHz SWITCHED MARKER MODULE MARKER MODULE VCO/POWER FILTER ASSY. OSCILLATOR (BEHIND) (FRONT) SAMPLER* AMPLIFIER ASSY. A4-J11 A4-J8 *DOWN CONVERTER 70dB STEP...
  • Page 131 Chapter 6 Adjustments Table of Contents INTRODUCTION ......6-3 RECOMMENDED TEST EQUIPMENT ... . 6-3 SIGNAL CHANNEL ADJUSTMENT PROCEDURE .
  • Page 132 HETERODYNE BAND 25 MHz MARKER VERIFICATION . 6-26 ALC/RF POWER ADJUSTMENT FOR MICROWAVE BAND MODELS ......6-27 Required Test Equipment .

  • Page 133: Introduction

    (page 6-5). All potentiometers (Rx) referred to in this procedure are located on the A3 PCB. Required Test Equipment: Detector Simulator — WILTRON T1492, or equivalent; refer to Appendix B. DC Voltage Standard — John Fluke Model 335D, or equivalent Adaptor Cable —...

  • Page 134: Log Conformity Adjustment

    LOG CONFORMITY ADJUSTMENT ADJUSTMENTS Perform this procedure as follows: Conformity Step 1 Connect detector simulator T1492 to IN- Adjustment PUT A and turn the 54XXA on. (If not done previously, allow 30 minutes warm up before continuing with the adjustment procedure.) Step 2 Press the SYSTEM MENU key.
  • Page 135 SIGNAL CHANNEL ADJUSTMENTS SENSITIVITY ADJUSTMENT Signal Perform this procedure as follows: Channel Step 1 Connect the equipment as shown in Fig- Sensitivity ure 6-1. Adjustment Step 2 Press the SYSTEM MENU key. Select re- set and press the SELECT key. Step 3 Select Restore Default Setup and press the SELECT key.

  • Page 136: Signal Channel Sensitivity Adjustment

    SIGNAL CHANNEL SENSITIVITY ADJUSTMENT ADJUSTMENTS Step 9 Set the DC Voltage Standard for –0.6208 volts output. Press the 54XXA CURSOR key to obtain a readout in the menu area of the 54XXA display. Step 10 Adjust A3R118 to obtain a cursor readout of +9.00 dBm ±0.01 dBm.
  • Page 137 YIG DRIVER ADJUSTMENTS ADJUSTMENT PROCEDURE YIG DRIVER Use this procedure to make adjustments to the A5 YIG Driver/Signal ADJUSTMENT Channel Interface PCB. All variable resistors (Rx) and jumpers re- PROCEDURE ferred to in this procedure are located on the A5 PCB. Procedure Step 1 Confirm that jumper J2 is positioned per...

  • Page 138: Yig Driver Adjustment Procedure

    YIG DRIVER ADJUSTMENT PROCEDURE ADJUSTMENTS Table 6-2. START DAC Minimum Step 4 Press the 54XXA DATA ENTRY “1” key to Adjustment Frequencies select “frequency dac control” sequence. START DAC Step 5 Press the DATA ENTRY “1” key twice. 54XXA Model Calibration This sets the START DAC to minimum Freq (GHz)
  • Page 139 YIG DRIVER ADJUSTMENTS ADJUSTMENT PROCEDURE Step 9 For model 5436A: Press the DATA EN- Table 6-3. START DAC Maximum TRY “1” and “5” keys simultaneously. The Adjustment Frequencies highlighted video block should now dis- START DAC play the “start dac” set to “top.” 54XXA Model Calibration Freq (GHz)

  • Page 140: Alc Pre-Adjustment Procedures For Microwave Band Models

    Power Meter, with suitable matching power sensor (Figure 6-3) Digital Voltmeter, with 4-1/2 digits resolution (Table 1-2) Oscilloscope, dual channel with two X10 probes (Table 1-2) WILTRON RF Detector — to match 54XXA model (Table 1-2) 6-10 54XXA MM...

  • Page 141: Reference Voltage Adjustment

    MICROWAVE BAND ADJUSTMENTS PRE-ADJUSTMENT PROCEDURE Reference For units equipped with D35429-3A A6 PCB’s, use Voltage the variable resistor designations shown in paren- Adjustment thesis in the following procedure. Procedure Step 1 Set DVM for DC, 1V range (not autorange). Connect common lead to TP25;...

  • Page 142: Power Output Adjustment

    MICROWAVE BAND PRE-ADJUSTMENT PROCEDURE ADJUSTMENTS Power Proceed as follows: Output Step 1 Press the SYSTEM MENU key. Select RE- Adjustment SET and press the SELECT key. Select RESTORE DEFAULT SETUP and press the SELECT key. Step 2 Put the 54XXA in CW mode by setting measurement Channels 1 and 2 off.
  • Page 143 MICROWAVE BAND ADJUSTMENTS PRE-ADJUSTMENT PROCEDURE Step 6 Connect the power meter sensor to the 54XXA RF OUTPUT connector (Fig- ure 6-3). Press the 54XXA RF ON/OFF key to OFF. Zero the power meter, and then press RF ON/OFF key to ON. Step 7 Adjust variable resistor R62 to give a power meter reading equal to the 54XXA...

  • Page 144: Alc Operating Point Adjustment

    MICROWAVE BAND PRE-ADJUSTMENT PROCEDURE ADJUSTMENTS ALC Operat- Proceed as follows: ing Point Step 1 Press the SYSTEM MENU key. Select RE- Adjustment SET and press SELECT key. Select RE- STORE DEFAULT SETUP and press the SELECT key. Step 2 Set 54XXA as follows: Frequency: Full-band sweep (per front panel designation).
  • Page 145 MICROWAVE BAND ADJUSTMENTS PRE-ADJUSTMENT PROCEDURE Step 6 Connect CH B probe to A6TP28; connect the probe ground clip to the 54XXA chas- sis. The oscilloscope will display a wave- form with a negative dc component. Step 7 For models 5417A through 5436A: Ad- just A6R133 to move the oscilloscope trace more positive until the trace oscil- lates and/or the 54XXA UNLEVELED...

  • Page 146: Alc Pre-Adjustment Procedures For Rf Band Models

    RF BAND PRE-ADJUSTMENT PROCEDURE ADJUSTMENTS ALC PRE-ADJUSTMENT These procedures ensure that the RF output power of models 5407A, PROCEDURES FOR RF 5409A, and 5411A is approximately correct so that the 75 MHz and BAND MODELS 25 MHz markers can be calibrated. Use this procedure also for the RF (heterodyne) band of models 5417A and 5447A.

  • Page 147: Power Output Adjustment

    RF BAND ADJUSTMENTS PRE-ADJUSTMENT PROCEDURE Power Proceed as follows: Output Step 1 Press the SYSTEM MENU key. Select RE- Adjustment SET and press the SELECT key. Select RESTORE DEFAULT SETUP and press the SELECT key. Step 2 Put the 54XXA in CW mode by setting measurement Channels 1 and 2 off.

  • Page 148: Alc Operating Point Adjustment

    RF BAND PRE-ADJUSTMENT PROCEDURE ADJUSTMENTS Step 14 Adjustments R56 and R190 are interac- tive. Therefore, set RF output power to re- set level (Table 6-4) and repeat steps 8 through 10 until both power meter read- ings are within ±0.5 dBm of 54XXA indi- cated RF output power.
  • Page 149 RF BAND ADJUSTMENTS PRE-ADJUSTMENT PROCEDURE Step 4 Connect a suitable detector from the 54XXA RF OUTPUT connector to INPUT A. Press the channel 1 AUTOSCALE key (on). Step 5 Connect oscilloscope CH A input to the 54XXA rear panel HORIZONTAL OUT- PUT connector using a BNC to BNC ca- ble.

  • Page 150: 500 Mhz And 25 Mhz Marker Adjustment

    500 MHz AND 25 MHz MARKER ADJUSTMENT ADJUSTMENTS 500 MHz AND 25 MHz Use this procedure to make adjustments to the 500 MHz and 25 MHz MARKER ADJUSTMENT marker assemblies (on the RF Deck) and to the A6 ALC/Frequency Instruction PCB. Perform this procedure only if: The unit is a model 5417A through 5447A.
  • Page 151 500 MHz ADJUSTMENTS MARKER ADJUSTMENT Step 6 Press the DATA ENTRY “1” key to acti- vate the marker display. Step 7 Press the SELF TEST key, which will nor- malize the 54XXA display. The display should be a flat line with wide and nar- row pips that represent 500 MHz mark- ers and 25 MHz markers, respectively.
  • Page 152 500 MHZ MARKER ADJUSTMENT ADJUSTMENTS Step 12 Adjust the marker sensitivity variable re- Table 6-6. 500 MHz Markers HBE sistor for a waveform width between Adjustment Frequencies 12 MHz and 26 MHz. (The optimum width for these markers is as wide as pos- 54XXA Model Frequency sible —...
  • Page 153 25 MHz ADJUSTMENTS MARKER ADJUSTMENT Step 20 Press the OUTPUT POWER key and again set the power as shown in Ta- ble 6-7. Repeat steps 17 through 19. Step 21 Press the SELF TEST key and confirm that no 500 MHz frequency calibration failures occur during the self test se- quence.
  • Page 154 25 MHZ MARKER ADJUSTMENT ADJUSTMENTS Step 7 On the A6 ALC/Frequency Instruction PCB, adjust the frequency compensation variable resistor (R80) as follows: Adjust R80 until markers just begin to appear and note setting. Continue adjustment in same direction until spurious markers ap- pear.
  • Page 155 25 MHZ ADJUSTMENTS MARKER ADJUSTMENT Step 12 Set the center frequency as per Table 6-9. Observe that the displayed marker has a width of between 1.0 MHz and 2.0 MHz. If the marker width is incorrect, readjust the A6R80 frequency compensation vari- able resistor slightly.

  • Page 156: Heterodyne Band 25 Mhz Marker Verification

    HETERODYNE BAND 25 MHz MARKER VERIFICATION ADJUSTMENTS HETERODYNE BAND Use this procedure to check the 25 MHz markers throughout the het- 25 MHz MARKER erodyne band of models 5417A and 5447A. For models other than VERIFICATION 5417A and 5447A, proceed to paragraph 6-9. This procedure uses the same measurement technique as used in the 500 MHz and 25 MHz marker adjustment procedure to verify that the heterodyne band 25 MHz markers are present and of the correct...

  • Page 157: Alc/Rf Power Adjustment For Microwave Band Models

    Digital Voltmeter, with 4-1/2 digits resolution (Table 1-2) Oscilloscope, dual channel with two X10 probes (Table 1-2) WILTRON RF Detector — to match 54XXA model (Table 1-2) A6 PCB Con- Verify the jumper configuration of the A6 PCB per figuration table below.

  • Page 158: Reference Voltage Adjustment

    ALC/RF POWER ADJUSTMENT FOR MICROWAVE BAND MODELS ADJUSTMENTS Reference If the ALC Pre-Adjustment procedure (para- Voltage graph 6-5) was performed for the unit being ad- Adjustment justed, proceed to the Microwave Band Adjustment Procedure below. Otherwise, perform the Reference Voltage Adjustment procedure contained in para- graph 6-5 (page 6-11), and then continue below.

  • Page 159: Alc Operating Point Adjustment

    ALC/RF POWER ADJUSTMENT ADJUSTMENT FOR MICROWAVE BAND MODELS ALC Operat- Proceed as follows: ing Point Step 1 Press the SYSTEM MENU key. Select RE- Adjustment SET and press the SELECT key. Step 2 Set 54XXA as follows: Frequency: Full-band sweep (per front panel designation).
  • Page 160 ALC/RF POWER ADJUSTMENT FOR MICROWAVE BAND MODELS ADJUSTMENTS Step 8 For models 5437A and 5447A: Adjust R31 on the multi-band controller to move the oscilloscope trace more positive until the trace oscillates and/or the 54XXA UN- LEVELED LED lights. Now adjust R31 back two turns (trace more negative).

  • Page 161: Alc/Rf Power Adjustment For Rf Band Models

    ALC/RF POWER ADJUSTMENT ADJUSTMENT FOR RF BAND MODELS 6-10 ALC/RF POWER Use this procedure to make (final) adjustments to the A6 ALC/Fre- ADJUSTMENT FOR RF quency Instruction PCB for models 5407A through 5411A. Use this BAND MODELS procedure also for the RF (heterodyne) band of models 5417A and 5447A.

  • Page 162: Alc Flatness Adjustment

    ALC/RF POWER ADJUSTMENT FOR RF BAND MODELS ADJUSTMENTS ALC Flatness Proceed as follows: Adjustment Step 1 Press the SYSTEM MENU key. Select RE- SET and press the SELECT key. Select RESTORE DEFAULT SETUP and press the SELECT key. Step 2 Set 54XXA as follows: Frequency: Full-band sweep (per front panel designation).

  • Page 163: Alc Operating Point Adjustment

    ALC/RF POWER ADJUSTMENT ADJUSTMENT FOR RF BAND MODELS Step 5 For models 5417A and 5447A equipped with an internal attenuator, go to the ALC Operating Point Adjustment (next page). For models 5417A and 5447A with- out an attenuator, go to step 7. Step 6 For models 5407A, 5409A, and 5411A: Set the power output level to 2 dB above...
  • Page 164 ALC/RF POWER ADJUSTMENT FOR RF BAND MODELS ADJUSTMENTS ALC Operat- Proceed as follows: ing Point Step 1 Press the SYSTEM MENU key. Select RE- Adjustment SET and press the SELECT key. Select RESTORE DEFAULT SETUP and press the SELECT key. Step 2 Set 54XXA as follows: Frequency: Full-band sweep...
  • Page 165 ALC/RF POWER ADJUSTMENT ADJUSTMENT FOR RF BAND MODELS Step 8 For models 5407A, 5409A, and 5411A: Adjust A6R183 (R216) until the wave- form DC component value is –3.5V ±0.5V, as indicated by the oscilloscope trace. Note that this value is nominally 2.5V below the –1V “Upper Trip”...
  • Page 166 ALC/RF POWER ADJUSTMENT FOR RF BAND MODELS ADJUSTMENTS Step 11 Reduce the power output level by 12 dB. Verify that no oscillation or unleveled con- dition is present. If either condition is pre- sent, adjust R133 (for 5417A) or R31 on the multi-band controller (for 5447A) to move the oscilloscope trace slightly more negative until the oscillation and or un-...

  • Page 167: Band Switch-Point Adjustment

    BAND SWITCH POINT ADJUSTMENTS ADJUSTMENT 6-11 BAND SWITCH-POINT This procedure ensures that the power difference at the 2.0 GHz band ADJUSTMENT switch point of models 5417A and 5447A is reduced to a minimum. Procedure Step 1 Press the SYSTEM MENU key. Select RE- SET and press the SELECT key.

  • Page 168: Temperature Compensation Adjustment

    NOTE This procedure does not apply for units equipped with D35056-3 and D35056-3 A6 PCB’s. If your 54XXA is so equipped, call WILTRON Customer Service (refer to Table 2-1 on page 2-4). Required Equivalent equipment may be used — refer to para- Test Equip- graph 6-2 and to Table 1-2 (in Chapter I —...
  • Page 169 ALC TEMPERATURE ADJUSTMENTS COMPENSATION ADJUSTMENT Step 3 Set 54XXA as follows: Frequency: CENTER: 2.0 GHz WIDTH: 0.1 GHz RF Power Output: 5 dB below reset power level (refer to Table 6-4 on page 6-13) Channel 1: power mode, INPUT A Channel 2: OFF Cursors: Main Cursor and RELATIVE Cursor on...
  • Page 170 ALC TEMPERATURE COMPENSATION ADJUSTMENT ADJUSTMENTS Step 9 Set the T38300 jumper to the “cal” posi- tion. Adjust A6R81 (R104 on the daugh- ter board for older PCB’s) so that the RF band marker (M1) is 0.75 dB less than the value noted down in step 7. Step 10 Disconnect the black wire from the ther- mistor output of the Directional Coupler...
  • Page 171 ALC TEMPERATURE ADJUSTMENTS COMPENSATION ADJUSTMENT Step 16 For RF Band models 5407A, 09A, and 11A: Remove the top and side covers of the 54XXA (refer to paragraph 5-2). Dis- connect the Down Converter cable at con- nector J4 of the A4 Motherboard PCB, and connect one end of the Dummy Down Converter Thermistor, T38300, to the end of the cable.Connect the other end of...
  • Page 172 ALC TEMPERATURE COMPENSATION ADJUSTMENT ADJUSTMENTS Step 22 Turn off the 54XXA and remove the T38300 or T38301 fixtures. For micro- wave band models, re-connect the black wire to the thermistor output terminal of the directional coupler. Step 23 For RF Band models 5407A, 5409A, and 5411A: Go to step 27.
  • Page 173 ALC TEMPERATURE ADJUSTMENTS COMPENSATION ADJUSTMENT Step 27 For models 5417A and 5447A, perform the Band Switch Point Adjustment (para- graph 6-9) and then go to step 29. For all other microwave models, go to step 29. Step 28 For RF Band models: Set the frequency to 50 MHz and put unit in CW mode.
  • Page 174 Appendix A RF Detector Diode Replacement Procedures RF DETECTOR DIODE Series 5400-71XXX RF Detectors and series 560-7XXX RF Detectors REPLACEMENT are used with 54XXA systems. Paragraph A-2 contains the procedure PROCEDURES for replacing defective detector diodes in model 5400-71B75 RF Detec- tors, and paragraph A-2 contains the procedure for replacing detector diode modules in series 560-7XXX RF Detectors.
  • Page 175 DETECTOR DIODE REPLACEMENT MODEL 5400-71B75 RF DETECTOR APPENDIX A REPLACEMENT OF The model 5400-71B75 RF Detector is equipped with a field-replace- DETECTOR DIODE FOR able detector diode. To replace, proceed as follows: MODEL 5400-71B75 RF Step 1 Unfasten the four detector housing top cover retain- DETECTOR ing screws.
  • Page 176 Insert the diode into the socket of the PCB subas- sembly. Step 12 Reinstall the top cover, securing it with the four re- taining screws. This completes replacement of detec- tor diode. WILTRON 10 - 88 5400 - 71 DETECTOR DIODE SERIES K______________...
  • Page 177 DIODE MODULE REPLACEMENT SERIES 560-7XXX RF DETECTORS APPENDIX A REPLACEMENT OF Series 560-7XXX RF Detectors are equipped with a field-replaceable DIODE MODULES FOR diode module that contains (in addition to the detector diode) a ther- SERIES 560-7XXX mistor, a resistor, and two capacitors. To replace, proceed as follows: RF DETECTORS Step 1 Unfasten the four detector housing top cover retain-...
  • Page 178 (i.e., 3 o’clock and 9 o’clock positions). A .010 to 18.5 GHz B .010 to 26.5 GHz WILTRON C .010 to 34.0 GHz 560-A-7219 D .010 to 40 GHz DETECTOR MODULE .95 TYPICAL...
  • Page 179 DIODE MODULE REPLACEMENT SERIES 560-7XXX RF DETECTORS APPENDIX A Step 15 Insert fiberglass module retainer between the re- placement diode module and spring washer. Push down on retainer until fully seated. Step 16 Orient PCB subassembly normally as shown in Fig- ure A-4 and insert into detector housing so that leads from replacement diode module mate with con- nectors on PCB subassembly.
  • Page 180 Systems (refer to Chapter 6, paragraph 6-2). The T1492 may be fabri- cated as illustrated in the figure below. Or, it may be purchased from WILTRON as a special order item. Contact your WILTRON sales office for further details. PIN 1...
  • Page 181 Temperature Compensation Adjustment Procedure TEST AID (Chapter 6, paragraph 6-10). This test aid may be fabricated as shown below; or, it may be purchased from WILTRON as a special order item. Contact your WILTRON sales office for further details. JUMPER*, WPN 551−577 NORM JUMPER BLOCK*, WPN 551−569...
  • Page 182 54XXA Scalar Measurement Systems (Chapter 6, para- graph 6-10). This test aid may be fabricated as shown below; or, it may be purchased from WILTRON as a special order item. Contact your WILTRON sales office for further details.
  • Page 183 Subject Index 0 – 9 Main Coil Driver Circuit, 4-25 Remove/Replace Procedures, 5-6 Signal Channel Interface Circuits, 4-27 500 MHz/25 MHz Markers A6 ALC/Frequency Instruction PCB, 4-15 Adjustment Procedure, 6-20 500 MHz/25 MHz Marker Read Circuits, 4-22 54XXA Major Assemblies ALC/Power Level Control Circuits, 4-16 Location Diagrams, 2-7 to 2-8 Block Diagram, 4-15...
  • Page 184 Parts and Subassemblies, Replaceable, 2-3 Functional Overview of System, 4-3 Parts Ordering Information, 2-3 Graphics Processor Subsystem, 4-6 WILTRON Service Centers, 2-3 Major Functional Blocks, 4-4 Power Supply Assembly Measurement Channel Signal Processing, 4-7 Functional Description, 4-7, 4-40 to 4-41...
  • Page 185 Models 5417A and 5419A, 5-19 Models 5428A, 5430A, 5431A, and 5436A, 5-21 Models 5437A and 5447A, 5-23 RF Detector, Model 5400-71B75 WILTRON Service Centers, 2-4 Detector Diode Replacement Procedure, A-2 RF Detectors, Series 560-7XXX Detector Diode Replacement Procedure, A-4 RF Power Output Control...

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