Agilent Technologies E8257C

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2-71

Assembly Replacement

A25B Highband Detector Bias Board

Figure 2-35 A25B Highband Detector Bias Board

A25BW1

A25B

Main Page

Table of Contents3
Troubleshooting11
Electrostatic Discharge (ESD) Information12
Handling of Electronic Components and ESD12
Getting Started with Troubleshooting13
Running Self-Test13
A18 CPU Turn-On Test14
Failure Symptoms14
A2 Display Not Functioning or A2 Display Not Functioning after Turn-On14
A18 CPU Fails to Complete the Turn-On Check14
Checking the A18 CPU Voltages15
Verifying the A18 CPU Turn-On Sequence15
No Instrument Control from the Front Panel16
Error Messages16
Self-Test Failures and Related Troubleshooting17
Troubleshooting Assembly-Level Problems20
Front Panel Display Assembly Troubleshooting21
Power Supply Troubleshooting27
Self-Tests 1Xx for the A13 I/Q Multiplexer40
Self-Tests 2Xx: A5 Sampler Self-Test Errors42
Self-Tests 3Xx: A7 Reference (Standard) Self-Test Errors44
Self-Tests 4Xx: A8 Output Self-Test Errors45
Self-Tests 6Xx: A9 YIG Driver Self-Test Errors48
Self-Tests 7Xx: A6 Frac-N Self-Test Errors51
Self-Tests 9Xx: A10 ALC Self-Test Errors55
Self-Tests 10Xx: A7 Reference (Option UNR) Self-Test Errors57
Self-Tests 11Xx: A18 CPU Self-Test Errors59
Self-Tests 12Xx: A26 MID Self-Test Errors61
Self-Tests 13Xx: A11 Analog/Pulse Modulation Generator Self-Test Errors66
Self-Tests 16Xx for the A14 Baseband Generator (Option 002/602)69
Self-Tests 22Xx: A8 Output Self-Test Errors72
Troubleshooting Unlocks74
A6 Frac-N Loop Unlock74
513 1 Ghz out of Lock74
514 Reference Oven Cold74
515 10 Mhz Signal Bad75
520 Sampler Unlocked75
521 YO Loop Unlocked75
625 Internal Pulse Generator Unlock76
626 Internal Mod Source Unlock76
Troubleshooting Unlevels77
Troubleshoot and Correct any Unlock Problems before Troubleshooting Unleveled Problems77
Troubleshooting Adjustment Problems81
Troubleshooting ADC Adjustment Failures83
Troubleshooting Performance Test Problems84
Troubleshooting the RF Path86
ALC and RF Problems86
Troubleshooting Pulse Modulation87
Troubleshooting AT1 Attenuator89
Troubleshooting Harmonic Spurious90
20 Ghz Models90
40 Ghz Models Only91
Troubleshooting Non-Harmonic Spurious93
Troubleshooting Option UNR Phase Noise94
Overall Description95
A19 Power Supply95
A18 Cpu96
Input/Output Interface96
Frequency Generation97
Reference/Synthesis Loop Description103
A7 Reference104
A5 Sampler (CW Mode Only)105
A6 Frac-N105
A9 YIG Driver106
A28 YIG Oscillator (YO)107
A29 20 Ghz Doubler107
Reference/Synthesis Loop107
RF Path Description (Frequency Generation, Level Control, and Modulation)110
A29 20 Ghz Doubler110
A6 Frac-N111
A8 Output111
A30 Modulation Filter112
A27 40 Ghz Doubler (Analog Models Only)112
A23 Lowband Coupler/Detector, A24 Highband Coupler, and A25 High Band Detector112
Ghz Fast Pulse Modulator (Option 1E6)113
A35 3-20 Ghz I/Q Modulator (Vector Models Only)113
ALC Loop113
Modulation (AM, FM, ΦM, and Pulse)114
Digital Modulation115
Approximate Device Gains and Losses117
Self-Test Overview120
How Self-Test Works120
Independent Failures120
Contacting Agilent Technologies121
Agilent Sales and Service Offices123
Packaging a Signal Generator for Return124
Assembly Replacement126
Before You Replace an Assembly127
After Replacing or Repairing an Assembly127
Assemblies that You Can Replace128
Outer Instrument Cover130
Tools Required130
Removal Procedure130
Replacement Procedure130
Inner Instrument Cover132
Tools Required132
Removal Procedure132
Replacement Procedure132
Front Panel134
Tools Required134
Removal Procedure134
Replacement Procedure135
A1 Keyboard137
Tools Required137
Removal Procedure137
Replacement Procedure137
A2 Display139
Tools Required139
Removal Procedure139
Replacement Procedure139
A2DS1 Display Backlight141
Tools Required141
Removal Procedure141
Replacement Procedure141
A3 Power Switch143
Tools Required143
Removal Procedure143
Replacement Procedure143
A4 Inverter145
Tools Required145
Removal Procedure145
Replacement Procedure145
A5 Sampler, A6 Frac-N, A7 Reference (Standard and Option UNR), and A8 Output147
Tools Required147
Removal Procedure147
Replacement Procedure147
A9 YIG Driver149
Tools Required149
Removal Procedure149
Replacement Procedure149
A10 Alc151
Tools Required151
Removal Procedure151
Replacement Procedure151
A11 Pulse/Analog Modulation Generator153
Tools Required153
Removal Procedure153
Replacement Procedure153
A12 Pulse Modulator Board (Option 1E6)155
Tools Required155
Removal Procedure155
Replacement Procedure155
A13 I/Q MUX (E8267C Models Only)157
Tools Required157
Removal Procedure157
Replacement Procedure157
A14 Baseband Generator (E8267C Models Only)159
Tools Required159
Removal Procedure159
Replacement Procedure159
A17 Baseband Generator Interface (E8267C Models Only)161
Tools Required161
Removal Procedure161
Replacement Procedure161
A18 Cpu163
Tools Required163
Removal Procedure163
Replacement Procedure163
A18Bt1165
Tools Required165
Removal Procedure165
Replacement Procedure165
A19 Power Supply167
Tools Required167
Removal Procedure167
Replacement Procedure167
Rear Panel (Standard)169
Tools Required169
Removal Procedure169
Replacement Procedure170
Rear Panel (Option 1EM)172
Tools Required172
Removal Procedure172
Replacement Procedure173
A20 SMI (Source Module Interface)175
Tools Required175
Removal Procedure175
Replacement Procedure175
A21 Rear-Panel Interface177
Tools Required177
Removal Procedure177
Replacement Procedure177
A22 Line Module179
Tools Required179
Removal Procedure179
Replacement Procedure179
AT1 115 Db Attenuator181
Tools Required181
Removal Procedure181
Replacement Procedure181
AT1 115 Db Attenuator (Option 1EM)183
Tools Required183
Removal Procedure183
Replacement Procedure183
A23 Lowband Coupler/Detector185
Tools Required185
Removal Procedure185
Replacement Procedure185
A24 20 Ghz Highband Coupler (Option 520 Only)187
Tools Required187
Removal Procedure187
Replacement Procedure187
A24 40 Ghz Highband Coupler (Option 540 Only)189
Tools Required189
Removal Procedure189
Replacement Procedure189
A25 20 Ghz Highband Detector191
Tools Required191
Removal Procedure191
Replacement Procedure191
A25 40 Ghz Highband Detector (Option 540 Only)193
Tools Required193
Removal Procedure193
Replacement Procedure193
A25B Highband Detector Bias Board195
Tools Required195
Removal Procedure195
Replacement Procedure195
A26 MID (Microcircuit Interface Deck)197
Tools Required197
Removal Procedure197
Replacement Procedure197
A27 40 Ghz Doubler (Option 540 Models Only)199
Tools Required199
Removal Procedure199
Replacement Procedure199
A28 YIG Oscillator201
Tools Required201
Removal Procedure201
Replacement Procedure201
A29 20 Ghz Doubler203
Tools Required203
Removal Procedure203
Replacement Procedure203
A30 Modulation Filter (Standard and Option 1EA)205
Tools Required205
Removal Procedure205
Replacement Procedure206
A31 Motherboard (E8247C/57C)208
Tools Required208
Removal Procedure208
Replacement Procedure209
A31 Motherboard (E8267C)211
Tools Required211
Removal Procedure211
Replacement Procedure212
A32 10 Mhz Crystal Oscillator (Option UNR)215
Tools Required215
Removal Procedure215
Replacement Procedure215
A33 6 Db PAD217
Tools Required217
Removal Procedure217
Replacement Procedure217
A34 Internal Hard Drive (E8267C Models Only)219
Tools Required219
Removal Procedure219
Replacement Procedure219
A35 3-20 Ghz I/Q Modulator (E8267C Models Only)221
Tools Required221
Removal Procedure221
Replacement Procedure221
B1 Fan223
Tools Required223
Removal Procedure223
Replacement Procedure223
Replaceable Parts226
Ordering Information227
Call (800) 227-8164 to Order Parts Fast (U.S. Only)227
Save Money with Rebuilt-Exchange Assemblies228
Shipping a Defective Assembly Back to Agilent Technologies229
Frequency, Hardware, and Personality Options230
Assemblies and Hardware Options231
Assemblies from the Inside Front Panel View234
Assemblies from a Top View235
Assemblies from the Inside Rear Panel View237
Assemblies from a Microcircuit Deck View239
Assemblies from a Bottom View241
A18BT1 Lithium Battery243
Cables244
Hardware249
Front Panel View250
Disassembled Front Panel View252
Disassembled Rear Panel View254
Disassembled Rear Panel View255
Disassembled A32 10 Mhz Crystal Oscillator (Option UNR)257
Disassembled AT1 115 Db Attenuator View (Option 1E1)259
Disassembled A24 20 Ghz Highband Coupler and A25B Highband Detector Bias Board260
Disassembled A24 40Ghz Highband Coupler and A25B Highband Detector Bias Board261
Microcircuit Interface Deck Top View262
Main Chassis and MID Bottom View264
MM RF Output Connector (Option 540 Only)267
APC 3.5 RF Output Connector (Option 520 Only)268
Type-N RF Output Connector (Option 1ED Models Only)269
Main Chassis with Inside Cover and Right-Side Support Wall270
Outer and Inner Instrument Covers and Associated Parts271
Miscellaneous273
Accessories273
Documentation273
Electrostatic Discharge (ESD) Protective Supplies274
Abbreviations Used in Part Descriptions275
Post-Repair Procedures276
Post-Repair Procedures Matrix277
Safety and Regulatory284
General Safety Considerations285
Lithium Battery Disposal286
Assistance286
Certification286

Agilent Technologies E8257C - Page 196

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