Anritsu MT8850A Service Manual
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Anritsu MT8850A Service Manual

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Chapter 1
General
MT8850A BlueTooth Test Set
Service Manual
Part Number 13000-00116
Rev C
Page 1-0

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  • Page 1 Chapter 1 General MT8850A BlueTooth Test Set Service Manual Part Number 13000-00116 Rev C Page 1-0...
  • Page 2 ANRITSU is not liable for consequential damages. LIMITATION OF WARRANTY The foregoing warranty does not apply to ANRITSU connectors that have failed due to normal wear. Also, the warranty does not apply to defects resulting from improper or inadequate maintenance by the Buyer, unauthorised modification or misuse, or operation outside of the environmental specifications of the product.
  • Page 3 Notice The information contained within this document is subject to change without notice. Anritsu shall not be held liable for any errors or discrepancies contained within this document, nor for any consequential damages or injury resulting from the installation or use of the product contained within.
  • Page 4 Safety symbols used on equipment and in associated documentation Some or all of the following symbols may be used on Anritsu equipment. In addition, there may be other labels attached to products that are not shown in the diagrams in this manual.
  • Page 5 Chapter 1 General Page 1-4...

  • Page 6: Table Of Contents

    Chapter 1 General Table of Content Chapter 1 - General Information Page 1-1 Scope of This Manual ......…………… 1- 9 1-2 Introduction ......…………………...…… 1- 9 1-3 Related Manuals......……………..… 1- 9 1-4 Identification Number......………….…… 1- 9 1-5 Models, Options, And Accessories ....…..… 1-10 1-6 Service Policy .......……………….…...
  • Page 7 Chapter 1 General Chapter 4 - Theory Of Operation Page 4-1 Introduction ....……....……….…… 4-2 Product Overview .....…....……….…… 4-3 General Operation ……………....…..…..4-4 Overall Block Diagram..….……………….…..4-5 Radio PCB …………………..…......…..4-6 Main Processor PCB …………………………….….. 4-6 4-7 Human Interface..………………..…...…. 4-8 GPIB Operation ....………………..…..….. 4-9 Case Construction ………………......…...
  • Page 8 Chapter 1 General Chapter 6 –Troubleshooting Page 6-1 Introduction .......……………………... 6-1 6-2 Trouble Shooting Flow Diagram ……………………… 6-2 6-3 DC supplies ….………………………………………… 6-3 6-4 Front Panel and Display .………......… 6-4 6-5 Transmitter Output Level and Frequency Accuracy…6-4 6-6 Transmitter Output Level Control ….……………..….. 6-6 6-7 Transmitter Attenuator Control..…..………………….6-6 6-8 Transmitter Modulation ………………………….…….
  • Page 9 Chapter 1 General Chapter 8 – Service Mode Page 8-1 Introduction ......……………………...… 8-1 8-2 Accessing Service Mode ......…….….…. 8-1 8-3 Menu Functions Described ………………………..….. 8-1 Chapter 9 – Self Test Messages Page 9-1 Introduction ......……………………...… 9-1 9-2 Self Test Messages …………………………………….. 9-1 Appendix A - Connector Care And Handling A-1 Introduction .........…………………..….

  • Page 10: Chapter 1 - General Information

    CD ROM. For price and availability, contact the nearest ANRITSU Customer Service Centre IDENTIFICATION NUMBER The MT8850A Series ID number is affixed to the rear panel. Please use the complete ID number when ordering parts or corresponding with the ANRITSU Customer Service department.

  • Page 11: Models, Options, And Accessories

    Chapter 1 General MODELS, OPTIONS, AND ACCESSORIES The MT8850A BlueTooth Test Set is available with options, and accessories are listed be-low. Options Model No. Option MT8850A-01 Rack Mount, single unit MT8850A-03 Rack Mount, side-by-side MT8850A-10 Antenna for off air connection.
  • Page 12 Chapter 1 General MT8850 Page 1-11...
  • Page 13 Chapter 1 General Page 1-12...

  • Page 14: Introduction

    Test Station defined by Anritsu EMD. Some of the equipment required must be purchased from Anritsu EMD but most of the equipment is standard Anritsu Products. See Table 2 for full equipment list. This chapter presents information on the Test Equipment/ Test Station, test conditions, and the verification procedure.
  • Page 15 National Instruments GPIB Card Test Programme Part Number 50104. Installation Anritsu A,P,T Disk Part No 2300-257 Frequency Counter High Accuracy Reference Anritsu MF2412B opt 2 or 3 A,P,T Power Meter +20 to –60dBm, 0.1-3GHz Anritsu ML2437A A,P,T Power Sensor +20 to –60dBm, 0.1-3GHz...
  • Page 16 ML24XXA METER MS8604A COUNTER RF CABLES MF2412B MT8850A Test Set Connect Frequency Counter 10MHz reference output to the Signal Generator and the Modulation Meter 10MHz reference inputs or use a suitable external 10MHz reference for all equipment. Figure 2-1 Page 2-3...
  • Page 17 Opt 2 fitted Procedure : 1. Set the MT8850A transmitter to channel 0 with the RF output enabled. Use the signal generator function to do this. (Press “Config”, highlight MT8850A using up/down data key pad arrows and press select, Select “Signal generator mode”. Set as below shown :-...
  • Page 18 POWER METER ML24XXA Procedure 1. Set the MT8850A transmitter to channel 0 with the RF output enabled. Use the signal generator function to do this. Press “Config”, highlight MT8850A using up/down data key pad arrows and press select, Select “Signal generator mode”. Set as shown below :-...
  • Page 19 As for Power Level accuracy Procedure 1. Set the MT8850A transmitter to channel 0 with the RF output enabled. Use the signal generator function to do this. Press “Config”, highlight MT8850A using up/down data key pad arrows and press select, Select “Signal generator mode”. Set as shown below :-...
  • Page 20 Chapter 2 Verification Procedures Receiver Note : This section can only be performed if the MT8850A has version 1.10 firmware or above installed. Receiver Level and Flatness Accuracy Connection Power Sensor MA2472A MT8850A BT Test Set Power Meter Signal Generator...
  • Page 21 36. Disconnect the Power Sensor. 37. Connect the RF cable to the MT8850A RF input from the Signal Generator. 38. Set the MT8850A CW Measurement Mode to 2402MHz and press “enable” soft key if not already done. 39. Set the Signal Generator to 2402MHz +10dBm. Record the MT8850A Result : Power in Table 2-6.
  • Page 22 BlueTooth Measurement Tests Connection Set up MT8850A Reference unit Set to EXT COMMS. (Config, MT8850A, System Interface, RS232 Mode set EXT COMMS) Set to Slave as detailed below. Press "config", select "system features", select “connection control", select "make me an EUT".
  • Page 23 5. Press the "Update" key. 6. Enter the BlueTooth address of the MT8850A Reference Unit. 7. On the MT8850A under test (DUT), press the script key. Use the arrow keys to highlight the script Script : - QUICKTEST selection. Press select and enter 2. This will select the default script 2 for all the following tests.
  • Page 24 Chapter 2 Verification Procedures Result Tables Table 2-2 Transmitter Frequency Accuracy Channel 90 Measured Frequency Error Specification 2.492GHz 1.25KHz Table 2-3 Transmitter Level Accuracy Set Power Level dBm Measured Power dBm Error dB Specification dB +/- 1.0 +/- 1.0 +/- 1.0 +/- 1.0 +/- 1.0 +/- 1.0...
  • Page 25 Chapter 2 Verification Procedures Result Tables Table 2-6 Receiver Level Accuracy 2402MHz 2440MHz 2478MHz MT8850 Error MT8850 Error MT8850 Error Max Diff Spec level Reading level Reading level Reading error Table 2-7 Single Slot BER/FER (Bit/Frame error rate) Measured Parameter Measured Value Specification Overall BER...

  • Page 26: Recommended Test Equipment

    This chapter describes the process of calibrating an ANRITSU MT8850A BlueTooth Test Set. The BlueTooth Test Set can only be calibrated using the MT8850A Test Station. The test station profiles the uncorrected performance of the MT8850A and stores this data inside an EEPROM on the RF PCB and Flash Memory on the Control PCB inside the unit.

  • Page 27: Calibration Test Set Up

    Modulation Meter 10MHz reference inputs or use an external 10MHz reference for all equipment. For Frequency Jitter calibration connect the Low Frequency counter Input 2 to the MT8850A test point (defined in the test programme) on the RF PCB. Figure 3-1...

  • Page 28: Test Station Operation

    This section describes the operation of the calibration section of the program. Calibration of the MT8850A can only be performed when all section are completed in the correct sequence with all sections reporting acceptable results. The calibration sequence is detailed below :- 1.
  • Page 29 Procedure :- 1. Remove the Line Power cable. 2. Remove the MT8850A top cover be releasing the 6 screws on the under side. 3. Remove the Radio PCB top screen by removing the 21 screws and split washers. 4. Rest the MT8850A top cover but do not tighten screws.

  • Page 30: Introduction

    Many slave devices can be connected to a master at one time. Note : Normally the MT8850A Test Set is the master and the device under test is the slave. The MT8850A does have the ability to operate in a limited way as a slave.

  • Page 31: General Operation

    Theory of Operation General Operation The MT8850A BlueTooth Test Set is designed to perform production test of other BlueTooth devices. Each BT device has a 12 digit unique address. An example of this address is “000091E08558”. The BlueTooth Radio Protocol operates in the 2.4 to 2.5GHz band. 100 Channels at 1 MHz interval are used.

  • Page 32: Overall Block Diagram

    Chapter 4 Theory of Operation Overall Block Diagram Unit Input Keyboard LCD Display /Output Unit Control GPIB Data entry DUT Serial Link RS232 BNC I/O Central Processor Core Processor BT Processor BT Measurement DSP BT Level & Frequency Measurement BlueTooth Radio Receiver Transmitter I/F signal...

  • Page 33: Radio Pcb

    Chapter 4 Theory of Operation RADIO PCB Below is a block diagram of the Radio PCB. To and from Processor PCB Receiver Transmitter 7MHz I/F to Processor PCB Tx Signal Digital Data Generator Interface Discriminator Transmitter Amplifier 10MHz Mixer Local Reference Oscillator Receiver...
  • Page 34 Chapter 4 Theory of Operation The Radio PCB is split into two main section, the transmitter and receiver. Each section is described in more detail below. Transmitter Frequency The signal generator produces 100 channel frequencies between 2.4GHz and 2.5GHz. In general during normal BlueTooth operation the transmitter is operating in hopping mode.

  • Page 35: Main Processor Pcb

    Chapter 4 Theory of Operation Main Processor PCB To and from Rear panel connectors BNC 1 BNC I/O RS232 Interface GPIB Interface Control Arm Code Flash Main Code in Memory Flash Memory Main Processor Main Processor Arm Processor Operating Baseband Control Memory Digital Signal FPGA Baseband...
  • Page 36 Chapter 4 Theory of Operation Main Processor PCB description The main processor (CPU C165 device) is a 16 bit device operating at 20 MHz. The main operating firmware for the processor is stored in Flash Memory. The firmware is loaded in this memory using a boot strap code loading method.

  • Page 37: Human Interface

    The front and rear panels are fitted into slots in the top and bottom cases. The Rack mount for the MT8850A is identical in the side by side option 3 and metal bracket single option 1 to the ML24XXA Power Meter range.

  • Page 38: Internal Construction

    The bottom 10% is a single text line for the menus. System Keys The operation of the MT8850A is controlled by five system keys: Run, Loop/Stop, Scpt/Run, Config, Preset. Each of these keys generates a soft key menu on the bottom line of the display.

  • Page 39: Front Panel Connectors

    Radio operation. Connection can be via cable or Arial (off air). EUT Connector A 12 pin female Hirose connector provides serial connection to a BlueTooth Device under test. A Hirose to 9 Pin D male connector cable is provided with each MT8850A as standard. 4-13 REAR PANEL The rear panel is made from sheet aluminium and contains the ground stud, line power input module, RS232 I/O connector, GPIB connector, four BNC I/O connectors.

  • Page 40: Power Supply Operation

    4-14 POWER SUPPLY OPERATION The MT8850A power supply is a switch mode type with three DC outputs at +5.8V, +15V, and –15V. The line power required for correct operation is 85-264V AC at 48 to 63Hz. When line power is applied all three DC outputs will always be present. The main processor is always in operation when the line power is applied.

  • Page 41: Chapter 5 - Firmware Updates

    Do not interrupt the down loading process as corruption of the EPROM program may result Running the Program 1. Connect the personal computer serial COM port to the MT8850A back panel. 2. RS232 Serial Connector, using the ANRITSU Serial Interface cable (PN: B41323) or equivalent.
  • Page 42 MT8850A.The program takes about eight minutes to complete the update, during which time the MT8850A LCD screen will display “Loading Software … Please wait” When the down loading is complete, the MT8850A will reboot and be ready for normal use.

  • Page 43: Bootload Mode

    Number B41323) or equivalent (see section 5-4). 3. Fit a jumper (ANRITSU PN 551-577) to J505 (BOOT) located to the right of the power supply on the main PCB board. Refer to the PCB drawing (Figure 5-1) for the location of J505.
  • Page 44 Chapter 5 Firmware Updates Figure 5-1 Position of Jumper J505 Page 5-4...

  • Page 45: Serial Interface Cable

    Firmware Updates SERIAL INTERFACE CABLE The 9-pin null-modem serial interface cable necessary for upgrading the MT8850A firmware is available from the ANRITSU Customer Service department. Order part number B41323. The cable can also be assembled from the following readily available...

  • Page 46: How To Change The Unit Serial Number

    Firmware Updates 5-5 How to change the unit serial number When a new control PCB is fitted to a MT8850A unit the serial number on the rear panel should be programmed in to the new control PCB. To perform this operation a special code loader program called “snumload.exe”...

  • Page 47: Chapter 6 -Troubleshooting

    3. Control PCB 4. Front Panel and Display assembly. There are two basic ways to find the fault in the MT8850A. The first and simplest way is to replace each assembly and determine if this resolves the Problem. The second way is to make measurements and determine which assembly is defective.

  • Page 48: Trouble Shooting Flow Diagram

    Chapter 6 Troubleshooting Trouble Shooting Flow Diagram System Fault Finding No Display or Front Panel Operation PSU not OK Check Power Supply Replace PSU Software Load OK Replace Front Panel Assembly Try Load PSU OK Software Software Not OK. Replace Control PCB Display &...
  • Page 49 Chapter 6 Troubleshooting 6-3 DC Power Supplies. 1. Remove the Line power cord. 2. Remove the top cover by undoing the six screw from the underside of the unit. 3. Replace the Line Power cord. 4. Measure the +5.8V +/-0.25V and the +/-15V +/- 1.0V DC supplies on the main control PCB as indicated in Figure 6-1.

  • Page 50: Front Panel And Display

    With the Line Power cable connected and the front panel on/off key pressed, there is a display on the unit but the keys do not operate 1. Replace the Front Panel assembly 6-5 Transmitter Output Level and Frequency Accuracy Connection MT8850A MS2602A Spectrum Analyzer MF2412B Frequency...
  • Page 51 Chapter 6 Troubleshooting Unit Set up. Preset the MT8850A Press “Config” Use the up/down data keys highlight the “service menu” and press select key. Enter code 1438 Highlight the “Calibration Set up ” and press select. Highlight the “calibration and set up menu” and press select.

  • Page 52: Transmitter Output Level Control

    Same as for section 6-6 except set level to –15, --25, -35, -45, -51dBm Connect a Power Meter to the RF input/output of the MT8850A and confirm all the levels are within +/-1dB. Fault 1: 1. If the level is incorrect the unit may need calibration. Use the test station to perform this function or use a replacement RF PCB.

  • Page 53: Transmitter Modulation

    Mod Index 0.28 Press the send soft key. See figure 6.3 for the location of the key. Connect a Spectrum analyzer to the MT8850A RF input/output. Set to 2.402GHz Span 10MHz. Set to a ref level of 10dBm. Fault 1: 1.
  • Page 54 Chapter 6 Troubleshooting Figure 6-4 Tx Modulation Pattern 1111000 Figure 6-5 Tx Modulation Pattern 10101010 Page 6-8...

  • Page 55: Transmitter Phase Noise

    Troubleshooting 6-9 Transmitter Phase Noise Connection of Spectrum Analyzer as for section 6-5 Unit Set up. Preset the MT8850A Press “Config” Use the up/down data keys highlight the “service menu” and press select key. Enter Code 1438 Highlight the “Calibration Set up ” and press select.
  • Page 56 Chapter 6 Troubleshooting Figure 6-6 Tx CW 2.402GHz span 500KHz Figure 6-7 Tx CW 2.402GHz span 500KHz Page 6-10...

  • Page 57: Receiver I/F Signal & Frequency Accuracy

    Chapter 6 Troubleshooting 6-10 Receiver I/F Signal & Frequency Accuracy Connection Connect to RF PCB Rx Test Port MT8850A MS2602A Spectrum Analyzer MF2412B Frequency Counter Page 6-11...
  • Page 58 Using the up down arrows move the pointer to “Rx Attenuator” and press select. Press the select key again to display Rx RF band ‘chan 3’ on the MT8850A unit. Press the Send soft key at the bottom of the display.

  • Page 59: Receiver Rf Level

    Using the up down arrows on the key pad move the arrow pointer so it is next to “Rx Attenuation and Gain menu” and press select. Press the select key again to display Rx RF band ‘3’ on the MT8850A unit. Press the Send soft key at the bottom of the display.
  • Page 60 Replace the control PCB. Fault 2: Press the select key to display Rx RF band ‘chan 2’ on the MT8850A unit. Record the spectrum analyzer level at 7.0MHz. Press the Send soft key at the bottom of the display.

  • Page 61: Receiver Phase Noise

    Using the up down arrows on the key pad move the arrow pointer so it is next to “Rx Attenuation and Gain menu” and press select. Press the select key again to display Rx RF band ‘3’ on the MT8850A unit. Press the Send soft key at the bottom of the display.

  • Page 62: Receiver Demodulation

    Chapter 6 Troubleshooting 6-13 Receiver Demodulation Connection Connect to RF PCB ZTP8/9 Test Point Connect to RF PCB Rx Test Port MT8850A MS2602A Spectrum Analyzer Oscilloscope Page 6-16...
  • Page 63 Using the up down arrows on the key pad move the arrow pointer so it is next to “Rx Attenuation and Gain menu” and press select. Press the select key again to display Rx RF band ‘3’ on the MT8850A unit. Press the Send soft key at the bottom of the display.
  • Page 64 Chapter 6 Troubleshooting Figure 6-11 Rx Modulation Pattern 1111000 Figure 6-12 Rx Modulation Pattern 10101010 Page 6-18...
  • Page 65 Chapter 6 Troubleshooting Fault 2: Connect the oscilloscope to RF PCB test points ZTP9 and ZTP8 and confirm :- 1. ZTP9 is a sine wave of greater then 500mV offset to 1.5V at 500KHz 2. ZTP8 is a 3.3V square wave. Figure 6-13 Test Points ZTP8 ZTP9...

  • Page 66: Dirty Transmitter

    MT8850A MS2602A Spectrum Analyzer Unit Set up. Preset the MT8850A Press “Config” Use the up/down data keys highlight the “service menu” and press select key. Enter Code 1438 Highlight the “Calibration Set up ” and press select. Highlight the “calibration and set up menu” and press select.
  • Page 67 Confirm the spectrum analyzer peak moves approximately 75KHz high and then low.. If not :- Replace the RF PCB. Replace the control PCB. Transmitter Data clock frequency. (Jitter Clock) Connection MT8850A Transmitter Data Clock Frequency Test point J201 Pin 1 on main control...
  • Page 68 Chapter 6 Troubleshooting 1. Set the counter to Input 2 at 1M ohm input impedance. 2. Confirm the counter reads 500KHz +/- 2Hz 3. Press “Config” 4. Use the up/down data keys highlight the “service menu” and press select key. 5.
  • Page 69 Chapter 6 Troubleshooting 6-15 EUT Serial Control of DUT BT Device. Connection Set up To 9 Pin D Reference MT8850A Unit Connector Bootload Cable MT8850A Under Test Standard EUT Cable Page 6-23...
  • Page 70 Press select. With "Identify" highlighted press select. The BlueTooth address of the unit will now be displayed. 2. On the MT8850A unit under test (DUT), press the "Scpt\Test" key. 3. Press "EUT addr" 4. Press select to show ">RS232<"...
  • Page 71 Connection GPIB CABLE MT8850A Under Test Send the GPIB command “*IDN?” and read the response. The returned string should be “Anritsu,MT8850A,XX.XX” where XX.XX is the software version number. Fault 1: If not :- a) Re-load the main control PCB software.

  • Page 72: Rear Panel Bnc Connectors

    BNC Output 1 Set up :- Connect a DVM set to DC Volts to the Tx BNC Output 1 on the Rear panel. Set the MT8850A unit :- Press “Config”, select “service”, select “calibration menu”, Select “Calibration set up menu”. Using the select and arrow key highlight the Transmitter and enable it.
  • Page 73 6. Confirm the voltage is less than 0.25V DC. 7. Select Tx state on the MT8850A and press select to show enabled. 8. Press send and confirm the DVM reads 5.0V +/-0.25V. 9. Select Tx state and press select to show disabled.
  • Page 74 Counter Connection Set up Connect the Signal generator output to the MT8850A unit under test External 10MHz input. Connect the MT8850A unit under RF output to the counter RF input. MT8850A Unit under Test Set the MT8850A transmitter to channel 0 with the RF output enabled. Use the signal generator function to do this.

  • Page 75: Transmitter Modulation Index

    Chapter 6 Troubleshooting 6-19 Transmitter Modulation Index. Connection MT8850A MS8604A Modulation Meter Set the MS8604 as stated below :- Pre-set the MS8604 Modulation Meter. Input Terminal : RF RF level : 0dBm Frequency Channel & Frequency : 1Ch = 2402.000 000MHz...
  • Page 76 Chapter 6 Troubleshooting 1. Set the MT8850A transmitter to channel 0 with the RF output enabled. Use the signal generator function to do this. Press “Config”, highlight MT8850A using up/down data key pad arrows and press select, Select “Signal generator mode”. Set as below shown :-...
  • Page 77 Set Stop Frequency to 2.5GHz Set reference level to 10dBm 1. Connect MS2602A to MT8850A RF output. Averaging may be used for the tests below. 2. Use the spectrum analyser to make a reference and then delta marker measurement of the fundamental signal.

  • Page 78: Receiver Frequency Accuracy

    1. Measure the frequency of the Signal Generator with the counter. Record the reading in Table 6-3. 2. Connect the Signal Generator to the MT8850A Input. 3. Record frequency counter reading in Table 6-3. 4. Calculate the difference in the two frequency reading. Confirm this is within specification.

  • Page 79: Bluetooth Measurements

    MT8850A Unit under Test Set the unit to be Master :- Set to Ext Comms in the interface menu MT8850A Reference Unit Set to EXT COMMS. (Config, MT8850A, System Interface, RS232 Mode set EXT COMMS) Set the unit to be slave Press “Config”...
  • Page 80 Troubleshooting Procedure 1. On the MT8850A under test (DUT), press the script key. Use the arrow keys to highlight the script selection. Press select and enter 2. This will select the default FULLTEST Script 2 for all the following tests.
  • Page 81 Chapter 6 Troubleshooting 28. Carrier drift Test 29. On the MT8850A unit under test (DUT), press the "Scpt\Test" key. 30. Select "Carrier drift" and press "Single".. 31. Press the "Run" key. 32. Confirm that the top line of the DUT shows " Test running ".
  • Page 82 Chapter 6 Troubleshooting 64. Modulation Index Test 65. On the MT8850A unit under test (DUT), press the "Scpt\Test" key. 66. Select "Modulation Index" and press "Single".. 67. Press the "Run" key. 68. Confirm that the top line of the DUT shows " Test running ".
  • Page 83 Chapter 6 Troubleshooting Results Tables Transmitter Modulation Test Table 6-1 MT8850A MS8604A (P-P)/2 Error Specification Mod Index Set Reading X 2 0.32MHz +/-4.8KHz Transmitter Spurious and Harmonics Table 6-2 MT8850A MS2602A Spec MS2602A 2.4-2.5GHz Spec Set Freq Spurious/Harmonic Spurious/Harmonic 1-2.5GHz 2.4-8.5GHz...
  • Page 84 Chapter 6 Troubleshooting Results Tables BlueTooth Measurement Tests Table 6-4 Power Level Measured Parameter Measured Value Specification Packet avg +/-2dB Test Avg Max +/-2dB Test Avg Min +/-2dB Test peak +/-2dB Table 6-5 Initial Carrier Frequency Measured Parameter Measured Value Specification Offset +/-75KHz...
  • Page 85 Chapter 6 Troubleshooting Results Tables BlueTooth Measurement Tests Table 6-8 Multi Slot BER/FER (Bit/Frame error rate) Measured Parameter Measured Value Specification Overall BER 0.1% Overall FER 10.0% Table 6-9 Modulation Measured Parameter Measured Value KHz Specification Peak f1 avg >140 & < 175KHz f2 max >115 f2 avg/f1 avg...

  • Page 86: Chapter 7 - Removal And Replacement Procedures

    It is strongly recommend that MT8850A repair be performed by qualified technical personnel only. The preferred MT8850A service policy is the major assembly or complete unit exchange program (see section 1-6, page 1-11). Always verify the need for a assembly replacement using the troubleshooting guidelines presented in Chapter 6.

  • Page 87: Complete Unit Disassembly

    Removal and Replacement Procedures 7-2 Complete Unit Disassembly The procedure below details how to disassemble the complete MT8850A unit to it’s main sub assemblies. When a repair requires an assembly to be replaced use the part or all of the procedure below to replace the defective part.

  • Page 88: Main Radio Pcb

    Chapter 7 Removal and Replacement Procedures 4. Disconnect MCX connector J8 from the Radio PCB assembly. This is the cable for external 10MHz reference input from the rear panel. 5. Disconnect the RF Input/Output cable assembly from J7 on the main Radio PCB. 6.
  • Page 89 Chapter 7 Removal and Replacement Procedures 8. Turn the unit over so it rests on the front panel and the rear panel. Press down on the rear panel BNC connectors and lift up the lower case. This will break free the rear panel from the lower case.
  • Page 90 Chapter 7 Removal and Replacement Procedures 10. Turn the unit over and rest it on it’s lower case feet. 11. Gently lift up the main control PCB and disconnect the Line Power cable at the PSU which connects the rear panel to the PSU. 12.

  • Page 91: Front Panel Assembly

    Chapter 7 Removal and Replacement Procedures 7.2.3 Remove the Front Panel Assembly (from control PCB and rear panel) 13. Disconnect the Display Panel ribbon cable from J510 on the main PCB. 14. Disconnect the Flexi cable from J513 and J516 on the main control PCB. Pull back the locking tabs first to release the cable.
  • Page 92 Chapter 7 Removal and Replacement Procedures 7.2.4 Remove the rear panel (Detach from the main control PCB) 16. Remove the two screws which hold the Line Power input module to the rear panel. Undo the nut that secures the earth cable to the rear panel stud. Remove the module. 17.
  • Page 93 Chapter 7 Removal and Replacement Procedures 7.2.5 Remove The PSU Assembly 21. Remove the four screws which hold the PSU mounting bracket in the lower case. Lift the PSU and the out of the lower case. 22. Remove the four mounting screws that hold the PSU in the PSU mounting bracket. The PSU is now free.

  • Page 94: Cable Location During Assembly

    Chapter 7 Removal and Replacement Procedures Note : When re-building the unit pay special attention the location of the line Power Cable that connects to the PSU and the DC supply cable that connects the PSU to the control PCB. The cable can become trapped if incorrectly positioned.
  • Page 95 Chapter 7 Removal and Replacement Procedures Figure 7-10. PSU cable Lay side view. Line Power Cable Excess Figure 7-11. PSU Cable Lay Top View. Lay cable between pillar and plastic cage for PSU. Line Power Cable through slot Page 7-10...

  • Page 96: Chapter 8 - Service Mode

    Chapter 8 Service Mode INTRODUCTION This chapter describes the use of the Service Mode menus that are useful for service of the product. Some of the menus have already been described and used in section 6 Trouble Shooting. Not all service menu functions are described. The list below details the menu function described.
  • Page 97 Chapter 8 Service Mode Receiver band and measurement channel gain Access this menu by highlighting the “Rx attenuation and gain menu” and pressing select. The display will now show :- Rx RF Band IF Gain 10 dB Send Using the up/down arrows high light either the Rx Band or the gain. Then press select to change the value.
  • Page 98 Chapter 8 Service Mode Setting 1 Tx Mod Pattern 11110000 enabled disabled Tx Rx Loop disabled Tx Chan Rx Chan Mod Index 0.35 This set the transmitter to be on, modulation pattern 1111000 set on, transmitter channel 39 selected. Transmitter Modulation index set to 0.35. Setting 2 Tx Mod Pattern all 1’s...
  • Page 99 Chapter 8 Service Mode General Settings Access this menu by highlighting the “General control menu” and pressing select. The display will now show :- Tx Power Level Tx Channel number Rx Channel number Mod Index DAC 0x0000 Rx BNC ON input false Use the up/down arrows keys to highlight each section.

  • Page 100: Introduction

    9-1 INTRODUCTION This section of the manual describes the messages that are displayed if the MT8850A fails self test. The table below shows the message, a brief description of what the error is and which assembly may be faulty. 9-2 Self Test Error Listing...

  • Page 101: Connector Care And Handling

    Consequently, the centre pins of these devices may not have the proper pin depth. The pin depth of DUT connectors should be measured to assure compatibility before attempting to mate them with Power Sensor connectors. An Anritsu Pin Depth Gauge or equivalent can be used for this purpose.
  • Page 102 Appendix A Connector Care and Handling UT Connector Avoid over torquing connectors Over torquing connectors is destructive; it may damage the connector centre pin. Finger tight is usually sufficient for Type N connectors. Always use a connector torque wrench (8 inch-pounds) when tightening WSMA, K or V type connectors. Never use pliers to tighten connectors.
  • Page 103 Appendix A Connector Care and Handling Cleaning connectors The precise geometry that makes possible the RF component's high performance can easily be disturbed by dirt and other contamination adhering to the connector interfaces. When not in use, keep the connectors covered. To clean the connector interfaces, use a clean cotton swab that has been dampened with denatured alcohol.
  • Page 104 Appendix B Test Station Appendix B Test Station Test Station Installation CD disk Part Number 2300-257 Test Station operations manual Part Number 13000-00121 Page C-1...
  • Page 105 Appendix C MS8604A Calibration MS8604A Modulation Index Calibration. Connection BlueTooth RF Source Example Roden Schwarz SMIQ Generator. Tx Mod Index Spec +/-1.3% or better. MS8604A Modulation Meter Set the BlueTooth RF source as below :- Frequency 2.402GHz RF Level -5dBm Modulation Modulation type BlueTooth (GSFK 0.50)
  • Page 106 320KHz is the Calibration Factor for the MS8604A. Example MS8604A averaged reading 318.5KHz MS8604A Cal Factor 320 – 318.5KHz = +1.5KHz. When ever the MS8604A is used to measure the MT8850A Transmitter Modulation Index this value must be added to give an accurate reading. Page C-1...

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