Name: Agilent Technologies E8241A
Brand: Agilent Technologies
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Service Guide

Agilent Technologies

PSG Family Signal Generators

This guide applies to the signal generator models and associated serial number preﬁxes listed below.

Depending on your ﬁrmware revision, front panel operation may vary from descriptions in this guide.

E8241A: US4124

E8244A: US4124

E8251A: US4124

E8254A: US4124

Part Number: E8251-90030

Printed in USA

July 2001

Table of Contents4
Troubleshooting14
Before Troubleshooting15
ESD Information15
Getting Started with Troubleshooting16
To Run Self-Test16
ILT-1 Power Supply Failure and Self-Test17
ILT-2 Temperature Related Power Supply Failure18
ILT-3 A18 CPU Turn-On Test19
ILT4 Front Panel Display Troubleshooting22
Symptom: Dark Display22
Symptom: Bright Display Without Characters23
Symptom: Hardkeys or Softkeys Not Functioning25
Symptom: RPG Knob Not Functioning27
Symptom: Screen Saver Not Functioning27
Self-Test Failures and Related Troubleshooting28
Troubleshooting Assembly Level Problems30
Power Supplies30
Self-Tests 2Xx: A5 Sampler Self-Test Errors37
Self-Tests 3Xx: A7 Reference (Standard) Self-Test Errors39
Self-Tests 4Xx: A8 Output Self-Test Errors40
Self-Tests 6Xx: A9 YIG Driver Self-Test Errors42
Self-Tests 7Xx: A6 Frac-N Self-Test Errors44
Self-Tests 9Xx: A10 ALC Self-Test Errors47
Self-Tests 10Xx: A7 Reference (Option UNJ) Self-Test Errors49
Self-Tests 11Xx: A18 CPU Self-Test Errors51
Self-Tests 12Xx: A26 MID Self-Test Errors53
Self-Tests 13Xx: A11 Analog/Pulse Modulation Generator Self-Test Errors56
Troubleshooting Unlocks59
508 A6 Frac-N Loop Unlock59
513 1 Ghz out of Lock59
514 Reference Oven Cold59
515 10 Mhz Signal Bad59
520 Sampler Unlocked60
521 YO Loop Unlocked60
625 Internal Pulse Generator Unlock60
626 Internal Mod Source Unlock61
Troubleshooting Unlevels62
Troubleshoot and Correct any Unlock Problems before Troubleshooting Unleveled Problems62
Troubleshooting Adjustment Problems66
Troubleshooting ADC Adjustment Failures68
Troubleshooting Performance Test Problems69
Troubleshooting the RF Path71
ALC and RF Problems71
Troubleshooting Pulse Modulation72
Troubleshooting Problems <3.2 Ghz72
Troubleshooting AT1 Attenuator74
Troubleshooting Harmonic Spurious75
20 Ghz Models75
40 Ghz Models Only76
Troubleshooting Non-Harmonic Spurious78
Troubleshooting Option UNJ Phase Noise79
Overall Block Diagram81
Overall Block Description82
A19 Power Supply82
A18 Cpu82
Input/Output Interface82
Frequency Generation83
Reference/Synthesis Loop Block Diagram87
Reference/Synthesis Loop Block Description88
A7 Reference88
A5 Sampler88
A6 Frac-N89
A9 YIG Driver89
A28 YIG Oscillator (YO)89
A29 20 Ghz Doubler89
RF Path Block Diagram91
RF Path Block Description (Frequency Generation, Level Control, and Modulation)92
Frequency Generation92
A29 20 Ghz Doubler92
A6 Frac-N92
A8 Output92
A30 Modulation Filter93
A27 40 Ghz Doubler93
A23 Low Band Coupler/Detector, A24 High Band Coupler, and A25 High Band Detector93
ALC Loop93
A10 Alc93
Modulation (AM, FM, PM, and Pulse)94
Self-Test Overview95
Contacting Agilent Technologies97
Review the Warranty97
Contacting Agilent Sales and Service Offices98
Important Information Needed by an Agilent Service Representative98
Returning Your Signal Generator for Service99
Assembly Replacement100
Before You Replace an Assembly101
After Replacing or Repairing an Assembly101
Assemblies that You Can Replace102
Outer Instrument Cover103
Tools Required103
Removal Procedure103
Replacement Procedure103
Inner Instrument Cover105
Tools Required105
Removal Procedure105
Replacement Procedure105
Front Panel107
Tools Required107
Removal Procedure107
Replacement Procedure108
A1 Keyboard109
Tools Required109
Removal Procedure109
Replacement Procedure109
A2 Display111
Tools Required111
Removal Procedure111
Replacement Procedure111
A2DS1 Display Backlight113
Tools Required113
Removal Procedure113
Replacement Procedure113
A3 Power Switch115
Tools Required115
Removal Procedure115
Replacement Procedure115
A4 Inverter117
Tools Required117
Removal Procedure117
Replacement Procedure117
A5 Sampler119
Tools Required119
Removal Procedure119
Replacement Procedure119
A6 Frac-N121
Tools Required121
Removal Procedure121
Replacement Procedure121
A7 Reference (Standard and Option UNJ)123
Tools Required123
Removal Procedure123
Replacement Procedure123
A8 Output125
Tools Required125
Removal Procedure125
Replacement Procedure125
A9 YIG Driver127
Tools Required127
Removal Procedure127
Replacement Procedure127
A10 Alc129
Tools Required129
Removal Procedure129
Replacement Procedure129
A11 Pulse/Analog Modulation Generator131
Tools Required131
Removal Procedure131
Replacement Procedure131
A18 Cpu133
Tools Required133
Removal Procedure133
Replacement Procedure133
A18Bt1135
Tools Required135
Removal Procedure135
Replacement Procedure135
A19 Power Supply137
Tools Required137
Removal Procedure137
Replacement Procedure137
Rear Panel139
Tools Required139
Removal Procedure139
Replacement Procedure139
A20 SMI (Source Module Interface)141
Tools Required141
Removal Procedure141
Replacement Procedure141
A21 Rear-Panel Interface143
Tools Required143
Removal Procedure143
Replacement Procedure143
A22 Line Module145
Tools Required145
Removal Procedure145
Replacement Procedure145
AT1 115 Db Attenuator (Option 1E1)147
Tools Required147
Removal Procedure147
Replacement Procedure147
A23 Low Band Coupler/Detector149
Tools Required149
Removal Procedure149
Replacement Procedure149
A24 20 Ghz High Band Coupler (E8241A and E8251A Models Only)151
Tools Required151
Removal Procedure151
Replacement Procedure151
A24 40 Ghz High Band Coupler (E8244A and E8254A Models Only)153
Tools Required153
Removal Procedure153
Replacement Procedure153
A25 20 Ghz High Band Detector with A25B Detector Bias Board (E8241A and E8251A Models Only)155
Tools Required155
Removal Procedure155
Replacement Procedure155
A25 40 Ghz High Band Detector with A25B Detector Bias Board (E8244A and E8254A Models Only)157
Tools Required157
Removal Procedure157
Replacement Procedure157
A26 MID (Microcircuit Interface Deck)159
Tools Required159
Removal Procedure159
Replacement Procedure159
A27 40 Ghz Doubler (E8244A and E8254A Models Only)161
Tools Required161
Removal Procedure161
Replacement Procedure161
A28 YIG Oscillator163
Tools Required163
Removal Procedure163
Replacement Procedure163
A29 20 Ghz Doubler165
Tools Required165
Removal Procedure165
Replacement Procedure165
A30 Modulation Filter (Standard and Option 1EA)167
Tools Required167
Removal Procedure167
Replacement Procedure167
A31 Motherboard169
Tools Required169
Removal Procedure169
Replacement Procedure169
A32 10 Mhz Crystal Oscillator (Option UNJ)171
Tools Required171
Removal Procedure171
Replacement Procedure171
B1 Fan173
Tools Required173
Removal Procedure173
Replacement Procedure173
Replaceable Parts Ordering Information177
Call (800) 227-8164 to Order Parts Fast (U.S. Only)177
Save Money with Rebuilt-Exchange Assemblies178
Shipping the Defective Assembly Back to Agilent Technologies179
Abbreviations Used in Part Descriptions180
Major Assemblies181
Major Assemblies Top View182
Major Assemblies Bottom View183
Major Assemblies Microcircuit Deck View184
Inside Front Panel View185
A1 Keyboard185
A2 Display185
A2DS1 Backlight185
A3 Power Switch185
A4 Inverter185
Main Chassis Top View187
A5 Sampler187
A6 Frac-N187
A7 Reference (Standard)187
A7 Reference (Option UNJ)187
A8 Output187
A9 YIG Driver187
A10 Alc187
A11 Pulse/Analog Modulation Generator (E8251A and E8254A Models Only)187
A18 Cpu187
Main Chassis Bottom View189
Inside Rear Panel View191
A20 SMI (Source Module Interface)191
A21 Rear Panel Interface191
A22 Line Module191
Microcircuit Interface Deck Top View192
AT1 115 Db Attenuator (Option 1E1)192
A23 Low Band Coupler/Detector192
A25B High Band Detector Bias Board192
A26 MID (Microcircuit Interface Deck)192
MID Bottom View193
A28 YIG Oscillator193
A29 20 Ghz Doubler193
Battery-Lithium195
Cables196
Inside Front Panel View197
Main Chassis Top View199
Rear Panel View201
MID Top View (E8244A and E8254A Models Only)203
MID Top View (E8241A and E8251A Models Only)205
MID Bottom View207
Main Chassis Bottom View209
Hardware and Other Instrument Parts211
Front Panel View212
Disassembled Front Panel View213
Disassembled Rear Panel View215
Disassembled A32 10 Mhz Crystal Oscillator (Option UNJ)217
Disassembled AT1 115 Db Attenuator View (Option 1E1)218
Disassembled A29 20 Ghz Coupler/Detector (E8241A and E8251A Models Only)219
Disassembled A24 High Band Coupler and A25 High Band Detector (E8244A and E8254A Models Only)220
Microcircuit Interface Deck Top View221
Main Chassis and MID Bottom View223
MM RF Output Connector (E8244A and E8254A Models Only)225
APC 3.5 RF Output Connector (E8241A and E8251A Models Only)226
Type-N RF Output Connector (E8241A and E8251A with Option 1ED Models Only)227
Main Chassis with Inside Cover and Right-Side Support Wall228
Outer and Inner Instrument Covers and Associated Parts229
Miscellaneous230
Accessories231
Documentation231
Electrostatic Discharge (ESD) Protective Supplies231
Post-Repair Procedures234
Post-Repair Procedures Matrix235
Safety and Regulatory240
General Safety Considerations242
Lithium Battery Disposal243
Warranty244
Assistance245
Notice246
Certification247

Agilent Technologies E8241A Service Guide

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Brand	Agilent Technologies
Model	E8241A
Category	Portable Generator
Language	English