Keysight E8257D/67D

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E8257D/67D, E8663D PSG Signal Generators Service Guide

Assembly Replacement

A25B Highband Detector Bias Board

3-71

Figure 3-44 A25B Highband Detector Bias Board

A25BW1

A25B

Main Page

Table of Contents3
Troubleshooting15
Electrostatic Discharge (ESD) Information15
- Handling of Electronic Components and ESD16
Getting Started with Troubleshooting16
- Running Self-Test16
A18 CPU Turn-On Test17
- Failure Symptoms17
- A2 Display Not Functioning or A2 Display Not Functioning after Turn-On17
- A18 CPU Fails to Complete the Turn-On Check17
- Checking the A18 CPU Voltages18
- Verifying the A18 CPU Turn-On Sequence18
- No Instrument Control from the Front Panel18
- Error Messages18
- CPU Data Backup19
Self-Test Failures and Related Troubleshooting20
Troubleshooting Assembly-Level Problems24
- Front-Panel Display Assembly Troubleshooting24
- Power Supply Troubleshooting28
- Option 008/009 Troubleshooting42
- Self-Tests 1Xx for the A13 I/Q Multiplexer43
- Self-Tests 2Xx: A5 Sampler Self-Test Errors45
- Self-Tests 3Xx: A7 Reference (Standard) Self-Test Errors (for Instruments with Serial Prefixes < US4805/MY4805)47
- Self-Tests 4Xx: A8 Output Self-Test Errors (E8267D Only)48
- Self-Tests 6Xx: A9 YIG Driver Self-Test Errors51
- Self-Tests 7Xx: A6 Frac-N Self-Test Errors53
- Self-Tests 7Xx: A45 Frac-N Self-Test Errors (Option UNY)55
- Self-Tests 9Xx: A10 ALC Self-Test Errors56
- Self-Tests 10Xx: A7 Reference (Option UNR/UNX and Instruments with Serial Prefixes >= US4805/MY4805) Self-Test Errors58
- Self-Tests 11Xx: A18 CPU Self-Test Errors59
- Self-Tests 12Xx: A26 MID Self-Test Errors (E8257D)60
- Self-Tests 12Xx: A26 MID Self-Test Errors (E8267D)64
- Self-Tests 13Xx: A11 Analog/Pulse Modulation Generator Self-Test Errors68
- Self-Tests 16Xx for the A14 Baseband Generator (Option 601/602)70
- Self-Tests 22Xx: A8 Output Self-Test Errors72
- Self-Tests 24Xx: A38 Lowband Filter Self-Test Errors73
- Self-Tests 25Xx: A43 Amp Filter Self-Test Errors74
- Self-Tests 26Xx: A8 Output Self-Test Errors76
- Self-Tests 27Xx: A46 Offset Loop Self-Test Errors (Option UNY)77
- Self-Tests 28Xx: A8 Vector Output Self-Test Errors77
Troubleshooting Unlocks78
- 508 A6 Frac-N Loop Unlock78
- 512 A7 Reference Unlock79
- 513 1 Ghz out of Lock79
- 514 Reference Oven Cold79
- 515 10 Mhz Signal Bad79
- 520 Sampler Unlocked79
- 521 YO Loop Unlocked80
- 625 Internal Pulse Generator Unlock80
- 626 Internal Mod Source Unlock80
Troubleshooting Unlevels81
- Troubleshoot and Correct any Unlock Problems before Troubleshooting Unleveled Problems81
Troubleshooting Adjustment Problems86
Troubleshooting ADC Adjustment Failures88
Troubleshooting Performance Test Problems88
Troubleshooting the RF Path89
- Troubleshooting RF Power Levels89
- ALC and RF Problems90
- Troubleshooting Pulse Modulation91
- Troubleshooting AT1 Attenuator91
Troubleshooting Harmonic Spurious92
- 20 Ghz Models93
- 32 Ghz and 44 Ghz Models Only94
- 40 Ghz Models Only94
- 50 And 67 Ghz Models Only95
Troubleshooting Non-Harmonic Spurious95
Troubleshooting Option UNR/UNX/UNY and Instruments with Serial Prefixes >= US4805/MY4805 Phase Noise96
Overall Description97
- A18 Cpu97
- A19 Power Supply97
- Input/Output Interface97
- Frequency Generation98
Reference/Synthesis Loop Description105
- A5 Sampler (CW Mode Only)106
- A6 Frac-N106
- A7 Reference107
- A9 YIG Driver107
- A28 YIG Oscillator (YO)108
- A29 20 Ghz Doubler108
- A38 Switch Filter and A43 Lowband Amp Filter (Option 1EH)108
Reference/Synthesis Loop108
- A28 YIG Oscillator (YO)110
- A12 <3.2 Ghz Fast Pulse Modulator (Option UNW)111
- A6 Frac-N111
- A8 Output111
- A23 Lowband Coupler/Detector, A24 Highband Coupler, and A25 High Band Detector112
- A27 40 Ghz Doubler (Analog 40 Ghz Models and Vector 44 Ghz Models)112
- A29 20 Ghz Doubler112
- A30 Modulation Filter112
  - A6 Frac–N115
  - A29 20 Ghz Doubler116
- Approximate Device Gains and Losses117
RF Path Description (Frequency Generation, Level Control, and Modulation)110
Vector Low Band RF Path124
Self–Test Overview125
Contacting Agilent Technologies126
- Keysight Sales and Service Offices128
Ordering Information129
Assemblies131
- Assemblies from the Inside Front Panel View135
- Assemblies from a Top View (E8257D Option 520/540 and E8663D)137
- Assemblies from a Microcircuit Deck View (E8257D Option 520/540 and E8663D)142
- Assemblies from a Bottom View (E8257D and E8663D)145
- A18BT1 Lithium Battery147
Hardware163
- Front Panel View164
- Disassembled Front Panel View166
- Disassembled Rear Panel View168
- Disassembled A32 10 Mhz Crystal Oscillator (Option UNR/UNX/UNY and Instruments with Serial Prefixes >= US4805/MY4805)171
- Disassembled AT1 90Db/115Db Attenuator View (Option 1E1)172
- Disassembled A24 50Ghz Highband Coupler and A25B Highband Detector Bias Board175
- Disassembled A24 67Ghz Highband Coupler and A25B Highband Detector Bias Board176
- Microcircuit Interface Deck Top View177
- Main Chassis and MID Bottom View178
- MM RF Output Connector (Option 567 Only)181
- MM RF Output Connector182
- APC 3.5 RF Output Connector (Option 520 Only)183
- Type- N RF Output Connector (Option 1ED Models Only)184
- Main Chassis with Inside Cover and Right- Side Support Wall185
- Outer and Inner Instrument Covers and Associated Parts186
Miscellaneous187
- Electrostatic Discharge (ESD) Protective Supplies188
Abbreviations Used in Part Descriptions189
Before You Replace an Assembly191
Outer Instrument Cover194
Inner Instrument Cover196
Front Panel198
- Replacement Procedure199
A1 Keyboard201
A2 Display204
A2DS1 Display Backlight (Serial Number Prefix < US/MY5XXX3XXX Only)207
A3 Power Switch209
A4 Inverter (Serial Number Prefix < US/MY5XXX3XXX Only)212
- A5 Sampler, A6 Frac–N, A7 Reference (Standard and Option UNR/UNX/UNY), A8 Output A45 Frac- N and A46 Offset213
- A9 YIG Driver214
- Tools Required216
A11 Pulse/Analog Modulation Generator218
A12 Pulse Modulator Board220
A13 I/Q MUX (E8267D Standard or with Option 015) (Serial Prefixes <US4722/MY4722)222
A13 I/Q MUX (E8267D Standard or with Option H16/016) (Serial Prefixes >=US4722/MY4722)224
A14 Baseband Generator (E8267D Only)226
A17 Baseband Generator Interface (E8267D Only)228
- Tools Required230
A18Bt1232
- A19 Power Supply234
A20 SMI (Source Module Interface)236
A21 Rear–Panel Interface238
A22 Line Module240
A23 Lowband Coupler/Detector242
A24 20 Ghz Highband Coupler (Options 503, 509, 520, and 521)244
A24 40 Ghz Highband Coupler (Option 540)248
A24 50 Ghz Highband Coupler (Options 532 and 544)250
A24 67 Ghz Highband Coupler (Options 550 and 567)252
A25 20 Ghz Highband Detector (Options 503, 509, 520, & 521)254
A25 40 Ghz Highband Detector (Option 540)256
A25 50 Ghz Highband Detector (Options 532 and 544)257
A25 67 Ghz Highband Detector (Options 550 and 567)258
A25B Highband Detector Bias Board260
A26 MID (Microcircuit Interface Deck)262
A27 40 Ghz Doubler (Option 540)264
A27 40 Ghz Doubler (Options 532 and 544 Only)266
A28 YIG Oscillator268
A29 20 Ghz Doubler270
- A30 Modulation Filter (Standard and Option 1EA/1EU)272
- A31 Motherboard (E8257D & E8663D)274
A31 Motherboard (E8267D)276
A32 10 Mhz Crystal Oscillator278
A33 6Db PAD (Options 503, 509, 520, and 521)280
A33 10Db PAD (Options 532 and 544)282
Rear Panel (Standard)284
- Replacement Procedure285
Rear Panel (Option 1EM)286
- Replacement Procedure287
A34 Internal Hard Drive (E8267D Only - Discontinued)289
A35 3–20 Ghz I/Q Modulator (E8267D Only - Standard or with Option 015)290
A35 3–20 Ghz I/Q Modulator (E8267D Only - Standard or with Option H16/016) (Serial Prefixes US4722/MY4722)292
A36 Quadraplier (Options 550 and 567)294
A37 Upconverter (E8267D Only)296
A38 Lowband Switch Filter298
A39 Directional Sweep Coupler300
A40 Compact Flash Drive Assembly302
A41 Flash Drive Door Assembly304
A42 20 Ghz Power Amp (Option 521)306
A43 Lowband Amp Filter308
A44 Scan Modulation Bias Adapter (E8257D- 520 and E8663D Only)310
AT1 90 Db Attenuator312
AT1 115 Db Attenuator314
AT1 90 Db Attenuator (Option 1EM)316
AT1 115 Db Attenuator (Option 1EM)318
- Tools Required320
Post–Repair Procedures Matrix324
CPU Configuration336
General Safety Considerations339
Lithium Battery Disposal340

Keysight E8257D/67D - Page 261

Table of Contents