Name: Keysight Technologies E8257D
Brand: Keysight Technologies
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E8257D/67D, E8663D PSG Signal Generators Service Guide 311

Assembly Replacement

A23 Lowband Coupler/Detector

3. Torque all RF connectors to 8 in–lbs.

4. Perform the post–repair adjustments and performance tests that pertain

to this removal procedure.

Figure 3-29 A23 Lowband Coupler/Detector

E8257D & E8663D – W37

A23

E8267D – W75

Default Chapter5
- Table of Contents5
Troubleshooting17
- Electrostatic Discharge (ESD) Information17
- Electrostatic Discharge (ESD) Information18
  - Handling of Electronic Components and ESD19
- Getting Started with Troubleshooting20
  - Running Self-Test21
- A18 CPU Turn-On Test22
- Self-Test Failures and Related Troubleshooting25
- Troubleshooting Assembly-Level Problems30
- Troubleshooting Unlocks104
Contents105
- 514 Reference Oven Cold105
- 515 10 Mhz Signal Bad105
- 520 Sampler Unlocked106
- 521 YO Loop Unlocked106
- 625 Internal Pulse Generator Unlock107
- 626 Internal Mod Source Unlock107
Troubleshooting Unlevels108
- Troubleshoot and Correct any Unlock Problems before Troubleshooting Unleveled Problems108
Troubleshooting Adjustment Problems116
Troubleshooting ADC Adjustment Failures119
Troubleshooting Performance Test Problems120
Troubleshooting the RF Path122
- Troubleshooting RF Power Levels122
- ALC and RF Problems122
- Troubleshooting Pulse Modulation124
- Troubleshooting AT1 Attenuator125
Troubleshooting Harmonic Spurious127
- 20 Ghz Models127
- 32 Ghz and 44 Ghz Models Only129
- 40 Ghz Models Only129
- 50 And 67 Ghz Models Only130
Troubleshooting Non-Harmonic Spurious132
Troubleshooting Option UNR/UNX/UNY and Instruments with Serial Prefixes ≥ US4805/MY4805 Phase Noise133
Overall Description134
- A18 Cpu134
- A19 Power Supply134
- Input/Output Interface135
- Frequency Generation136
Overallpsg Vector Signal Generator145
Overallpsg Analog Signal Generator145
Reference/Synthesis Loop Description145
- A5 Sampler (CW Mode Only)147
- A6 Frac-N147
- A7 Reference148
- A9 YIG Driver149
- A28 YIG Oscillator (YO)150
- A29 20 Ghz Doubler150
- A38 Switch Filter and A43 Lowband Amp Filter (Option 1EH)150
Reference/Synthesis Loop150
RF Path Description (Frequency Generation, Level Control, and Modulation)152
- A6 Frac-N153
- A8 Output154
- A12 <3.2 Ghz Fast Pulse Modulator (Option UNW)154
- A23 Lowband Coupler/Detector, A24 Highband Coupler, and A25 High Band Detector155
- A27 40 Ghz Doubler (Analog 40 Ghz Models and Vector 44 Ghz Models)155
- Vector Low Band RF Path170
- Self-Test Overview171
  - How Self-Test Works171
  - Independent Failures171
- Contacting Keysight Technologies173
  - Keysight Sales and Service Offices175
  - Packaging a Signal Generator for Return175
Replaceable Parts177
- Ordering Information177
  - Order Parts Fast177
- Frequency, Hardware, and Personality Options178
- Assemblies180
- Assemblies from the Inside Front Panel View186
- Assemblies from a Top View188
- Assemblies from a Microcircuit Deck View193
- Assemblies from a Bottom View196
- A18BT1 Lithium Battery198
- Cables199
- Hardware210
Contents226
- Miscellaneous238
- Abbreviations Used in Part Descriptions241
Assembly Replacement243
- Before You Replace an Assembly243
- Assemblies that You Can Replace244
- Outer Instrument Cover248
  - Tools Required248
  - Removal Procedure248
  - Replacement Procedure248
- Inner Instrument Cover250
  - Tools Required250
  - Removal Procedure250
  - Replacement Procedure250
- Front Panel252
  - Tools Required252
  - Removal Procedure252
  - Replacement Procedure254
- A1 Keyboard256
  - Tools Required256
  - Removal Procedure256
  - Replacement Procedure256
- A2 Display259
  - Tools Required259
  - Removal Procedure259
  - Replacement Procedure259
- A2DS1 Display Backlight (Serial Number Prefix < US/MY5XXX3XXX Only)262
  - Tools Required262
  - Removal Procedure262
  - Replacement Procedure262
- A3 Power Switch264
  - Tools Required264
  - Removal Procedure264
  - Replacement Procedure264
- A4 Inverter (Serial Number Prefix < US/MY5XXX3XXX Only)267
  - Tools Required267
  - Removal Procedure267
  - Replacement Procedure267
- A5 Sampler, A6 Frac-N, A7 Reference269
- (Standard and Option UNR/UNX/UNY), A8 Output269
- A45 Frac-N and A46 Offset269
  - Tools Required269
  - Removal Procedure269
  - Replacement Procedure269
- A9 YIG Driver271
  - Tools Required271
  - Removal Procedure271
  - Replacement Procedure271
- A10 Alc273
  - Tools Required273
  - Removal Procedure273
  - Replacement Procedure273
- A11 Pulse/Analog Modulation Generator275
  - Tools Required275
  - Removal Procedure275
  - Replacement Procedure275
- A12 Pulse Modulator Board277
  - Tools Required277
  - Removal Procedure277
  - Replacement Procedure277
- A13 I/Q MUX (E8267D Standard or with Option 015) (Serial Prefixes <US4722/MY4722)279
  - Tools Required279
  - Removal Procedure279
  - Replacement Procedure279
- A13 I/Q MUX (E8267D Standard or with Option H16/016) (Serial Prefixes ≥ US4722/MY4722)281
  - Tools Required281
  - Removal Procedure281
  - Replacement Procedure282
- A14 Baseband Generator (E8267D Only)283
  - Tools Required283
  - Removal Procedure283
  - Replacement Procedure283
- A17 Baseband Generator Interface (E8267D Only)285
  - Tools Required285
  - Removal Procedure285
  - Replacement Procedure285
Contents287
- A18 Cpu287
  - Tools Required287
  - Removal Procedure287
- Replacement Procedure287
A18Bt1289
- Tools Required289
- Removal Procedure289
- Replacement Procedure289
A19 Power Supply291
- Tools Required291
- Removal Procedure291
- Replacement Procedure292
A20 SMI (Source Module Interface)294
- Tools Required294
- Removal Procedure294
- Replacement Procedure294
A21 Rear-Panel Interface296
- Tools Required296
- Removal Procedure296
- Replacement Procedure296
A22 Line Module298
- Tools Required298
- Removal Procedure298
- Replacement Procedure298
A23 Lowband Coupler/Detector300
- Tools Required300
- Removal Procedure300
- Replacement Procedure300
A24 20 Ghz Highband Coupler (Options 503, 509, 513, 520, and 521)302
- Tools Required302
- Removal Procedure302
- Replacement Procedure303
A24 40 Ghz Highband Coupler (Option 540)307
- Tools Required307
- Removal Procedure307
- Replacement Procedure307
A24 50 Ghz Highband Coupler (Options 532 and 544)309
- Tools Required309
- Removal Procedure309
- Replacement Procedure309
A24 67 Ghz Highband Coupler (Options 550 and 567)311
- Tools Required311
- Removal Procedure311
- Replacement Procedure311
A25 20 Ghz Highband Detector (Options 503, 509, 513, 520, & 521)313
- Tools Required313
- Removal Procedure313
- Replacement Procedure313
A25 40 Ghz Highband Detector (Option 540)316
- Tools Required316
- Removal Procedure316
- Replacement Procedure316
- A25 50 Ghz Highband Detector (Options 532 and 544)318
- A25 67 Ghz Highband Detector (Options 550 and 567)320
- A25B Highband Detector Bias Board322
- A26 MID (Microcircuit Interface Deck)324
- A27 40 Ghz Doubler (Option 540)327
- A27 40 Ghz Doubler (Options 532 and 544 Only)329
- A28 YIG Oscillator331
- A29 20 Ghz Doubler333
- A30 Modulation Filter (Standard and Option 1EA/1EU)335
- A31 Motherboard (E8257D & E8663D)338
- A31 Motherboard (E8267D)341
Contents344
A32 10 Mhz Crystal Oscillator344
- Tools Required344
- Removal Procedure344
- Replacement Procedure344
A33 6Db PAD (Options 503, 509, 513, 520, and 521)346
- Tools Required346
- Removal Procedure346
- Replacement Procedure346
A33 10Db PAD (Options 532 and 544)348
- Tools Required348
- Removal Procedure348
- Replacement Procedure348
Rear Panel (Standard)350
- Tools Required350
- Removal Procedure350
- Replacement Procedure351
Rear Panel (Option 1EM)353
- Tools Required353
- Removal Procedure353
- Replacement Procedure355
A34 Internal Hard Drive (E8267D Only - Discontinued)357
- Tools Required357
- Removal Procedure357
- Replacement Procedure357
A35 3-20 Ghz I/Q Modulator (E8267D Only - Standard or with Option 015)359
- Tools Required359
- Removal Procedure359
- Replacement Procedure359
A35 3-20 Ghz I/Q Modulator (E8267D Only - Standard or with Option H16/016) (Serial Prefixes ≥ US4722/MY4722)361
- Tools Required361
- Removal Procedure361
- Replacement Procedure361
A36 Quadraplier (Options 550 and 567)363
- Tools Required363
- Removal Procedure363
- Replacement Procedure363
A37 Upconverter (E8267D Only)365
- Tools Required365
- Removal Procedure365
- Replacement Procedure365
A38 Lowband Switch Filter367
- Tools Required367
- Removal Procedure367
- Replacement Procedure367
A39 Directional Sweep Coupler369
- Tools Required369
  - Removal Procedure369
  - Replacement Procedure369
- A40 Compact Flash Drive Assembly371
- A41 Flash Drive Door Assembly373
- A42 20 Ghz Power Amp (Option 521)375
- A43 Lowband Amp Filter377
- A44 Scan Modulation Bias Adapter (E8257D-520 and E8663D Only)379
- AT1 90 Db Attenuator381
- AT1 115 Db Attenuator383
- AT1 90 Db Attenuator (Option 1EM)385
- AT1 115 Db Attenuator (Option 1EM)387
- B1 Fan389
Post-Repair Procedures391
- Post-Repair Procedures Matrix392
- CPU Configuration405
Contents409
Safety and Regulatory409
- General Safety Considerations410
- Lithium Battery Disposal411
- Assistance411
- Certification411

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Brand	Keysight Technologies
Model	E8257D
Category	Portable Generator
Language	English