Service Guide
Agilent Technologies
E4428C/38C ESG Signal Generators
This guide applies to the following signal generator models:
E4428C ESG Analog Signal Generator
E4438C ESG Vector Signal Generator
Due to our continuing efforts to improve our products through firmware and hardware revisions, signal generator
design and operation may vary from descriptions in this guide. We recommend that you use the latest revision of
this guide to ensure you have up-to-date product information. Compare the print date of this guide (see bottom of
page) with the latest revision, which can be downloaded from the following website:
http://www.agilent.com/find/esg
Part Number: E4400-90511
Printed in USA
December 2007
© Copyright 2001-2007 Agilent Technologies, Inc.
Notice
The material contained in this document is provided “as is”, and is subject to being changed, without notice, in future editions.
Further, to the maximum extent permitted by applicable law, Agilent d isclaims all warranties, either express or implied with
regard to this manual and to any of the Agilent products to which it pertains, including but not limited to the implied warranties
of merchantability and fitness for a particular purpose. Agilent shall not be liable for errors or for incidental or consequential
damages in connection with the furnishing, use, or performance of this document or any of the Agilent products to which it
pertains. Should Agilent have a written contract with the User and should any of t he contract terms conflict with these ter ms,
the contract terms shall control.
ii
Contents
1. Troubleshooting
Before Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
ESD Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Getting Started with Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Troubleshooting Aids. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
ILT-1 Power Supply Failure and Self-Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
ILT-2 A12 CPU Power-On Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
ILT3 Front Panel Display Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Symptom: If the Display is Dark. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Symptom: If the Display is Bright, but without Characters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Symptom: If Hardkeys or Softkeys are Not Funct ioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
Symptom: If the RPG Knob is Not Functioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
Symptom: If the Screen Saver is Not Functioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Self-Test Failures and Related Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Running Self-Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Troubleshooting As sembly Level Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
Power Supplies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
Self-Tests 1x x for the A10 I/Q Multiplexer (E4438C Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
Self-Tests 2xx for the A15 Sampler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30
Self-Tests 4xx for the A13 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33
Self-Tests 5xx for the A17 Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-37
Self-Tests 6xx for the A21 YTO Driver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-40
Self-Tests 7xx for the A16 Frac-N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-43
Self-Tests 8xx for the A18 Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-48
Self-Tests 11xx for the A12 CPU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-50
Self-Tests 14xx for the A11 Internal Bit Error Rate Analyzer (E4438C Only). . . . . . . . . . . . . . . . . . . 1-52
Self-Tests 15xx for the A9 Digital Demodulator (E4438C Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54
Self-Tests 16xx for the A7 Baseband Generator (E4438C Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-56
Self-Tests 20xx for the A14 Extended Frequency Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-59
Self-Tests 21xx for the A23 Motherboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-62
Self-Tests 23xx for the A13 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-64
Troubleshooting Unlocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-68
514 Reference Oven Cold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-68
515 10 MHz Signal Bad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-68
512 Reference Unlocked . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-69
513 1 GHz Out of Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-69
iii
Contents
508 Frac-N Loop Unlock (Option 501, 502, 503, 504). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-69
508 Frac-N Loop Unlock (Option UNJ and Option 506) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 -69
520 Sampler Unlocked (Option UNJ and Option 506) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-69
521 YO Loop Unlocked (Option UNJ and Option 506) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-71
516 Baseband Generator Unlock (E4438C Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-71
623 Demod Unlock (E4438C Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-72
Troubleshooting Unlevels and the RF Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-73
Troubleshooting a Leveling Problem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-73
Troubleshooting the AT1 Electronic Attenuator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-78
Troubleshooting the AT1 High-Power Mechanical Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-81
Troubleshooting Adjustment Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-84
Troubleshooting Analog Bus ADC Calibration Failures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-87
Procedure for Signal Generators with Option 501, 502, 503, 504 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-87
Procedure for Signal Generators with Option UNJ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-88
Procedure for Signal Generators with Option 506 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-89
Troubleshooting P erformance Test Problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-90
Troubleshooting Harmonic Spurious . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-97
Troubleshooting Harmonic Spurious by Fundamental Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-97
To Verify Harmonic Performance at the RF Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-98
To Verify Harmonic Performance at the Coherent Carrier Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-98
Troubleshooting Non-Harmonic Spurious . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-100
Troubleshooting P hase Noise (Option UNJ and Option 506 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-102
Troubleshooting P ulse Modulation and LF Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-103
To Verify the Pulse Waveform at the A19 Daught erboard (All Options) . . . . . . . . . . . . . . . . . . . . . . .1-103
To Verify the Pulse Waveform at the A19 Daughterboard (Option 506 Only) . . . . . . . . . . . . . . . . . . .1-105
No Pulse Signal from LF Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-106
Troubleshooting I/Q Calibration (E4438C Only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-108
Pre-Troubleshooting Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-108
I/Q Calibration Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-109
Contacting Agilent Technologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-113
Review the Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-113
Contacting Agilent Sales and Service Offices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-113
Important Information Needed by an Agi lent Service Representative . . . . . . . . . . . . . . . . . . . . . . . . .1-113
Returning a Signal Generator for Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-114
Block Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-115
Overall Block Description for Option 501, 502, 503, 504 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-116
iv
Contents
Overall Block Diagram for O ption 501, 502, 503, 504 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-120
Frequency Synthesis Block Description for Option 501, 502, 503, 504 . . . . . . . . . . . . . . . . . . . . . . . 1-122
Frequency Synthesis Block Diagram for Option 501, 502, 503, 504 . . . . . . . . . . . . . . . . . . . . . . . . . 1-124
RF Path Block Description for Option 501, 502, 503, 504 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-126
RF Path Block Diagram for Option 501, 502, 503, 504 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-128
Overall Block Description for Option UNJ and O ption 506 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-130
Overall Block Diagram for O ption UNJ and Option 506 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-134
Frequency Synthesis Block Description for Option UNJ and Option 506 . . . . . . . . . . . . . . . . . . . . . 1-136
Frequency Synthesis Block Diagram for Option UNJ and Option 506 (Page 1 of 2) . . . . . . . . . . . . . 1-138
Frequency Synthesis Block Diagram for Option UNJ and Option 506 (Page 2 of 2) . . . . . . . . . . . . . 1-140
RF Path Block Description for Option UNJ or Option 506. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-142
RF Path Block Diagram for Option UNJ and Option 506 (Page 1 of 2). . . . . . . . . . . . . . . . . . . . . . . 1-146
RF Path Block Diagram for Option UNJ and Option 506 (Page 2 of 2). . . . . . . . . . . . . . . . . . . . . . . 1-148
Analog Modulation Block Description for All Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-150
Analog Modulation Block Diagram for All Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-152
Digital Modulation Block Description for All E4438C Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-154
Digital Modulation Block Diagram for All E4438C Option s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-156
2. Replaceable Parts
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Order Parts Fast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Save Money with Rebuilt-Exchange Assemblies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Shipping a Defective Assembly Back to Agilent Technologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Frequency, Hardware, and Personality Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Assemblies and Hardware Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Assemblies from a Top View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Assemblies from a Right-Side View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Assemblies of the Front Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
Assemblies of the Inside Rear Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
A23BT1 Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
Inside Front Panel and Fan Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
Option 501, 502, 503, 504 Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
Option UNJ Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
Option 506 Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24
Cables for the Inside Front Panel and Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25
Cables for Option 501, 502, 503, 504 Signal Generators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27
v
Contents
Overall Cables - Includes Cables for Option UN7, 300, 005, and 001/601 or 002/602) . . . . . . . . . . . .2-27
Front Panel Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-30
Standard Cables - Does Not Include Cables for the Front Panel, Option UN7, 300,
or 005. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-31
Only Option UN7, 300, 005, and 001/601 or 002/602 Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-32
Semi-Rigid Cables - Includes the AT1 Electronic Attenuator or the AT1 High-Power Mechanical
Attenuator (Option UNB) with the A28 Reverse Power Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-33
Option 1EM Overall Cables - Includes Cables for Option UN7, 300, 005, and 001/601 or 002/602) . .2-34
Option 1EM Semi-Rigid Cables - Includes the AT1 Electronic Attenuator or the AT1 High-Power
Mechanical Attenuator (Option UNB) with the A28 Reverse Power Protection . . . . . . . . . . . . . . . . . .2-37
Cables for Option UNJ Signal Generators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-38
Overall Cables - Includes Cables for Option UN7, 005, and 001/601 or 002/602 . . . . . . . . . . . . . . . . .2-38
Front Panel Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-41
Standard Cables - Does Not Include Cables for the Front Panel, Option UN7, 300, or 005 . . . . . . . . .2-42
Only Option UN7, 300, 005, and 001/601 or 002/602 Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-43
Semi-Rigid Cables - Includes the A21 YTO Driver and the AT1 Electronic Attenuator or the AT1
High-Power Mechanical Attenuator (Option UNB) with A28 Reverse Power Protection . . . . . . . . . . .2-44
Option 1EM Overall Cables - Includes Cables for Option UN7, 005, and 001/601 or 002/602) . . . . . .2-46
Option 1EM Semi-Rigid Cables - Includes the A21 YTO Driver and the AT1 Electronic Attenuator or the
AT1 High-Power Mechanical Attenuator (Option UNB) with A28 Reverse Power Protection. . . . . . .2-49
Cables for Option 506 Signal Generators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-51
Overall Cables - Includes Cables for Option UN7, 005, and 001/601 or 002/602 . . . . . . . . . . . . . . . . .2-51
Front Panel Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-54
Standard Cables - Does Not Include Cables for the Front Panel, Option UN7, or Option 005 . . . . . . .2-55
Only Option UN7, 005, and 001/601 or 002/602 Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-57
Semi-Rigid Cables - Includes the A21 YTO Driver and the AT1 High-Power Mechanical Attenuator
(Option UNB) with an A29 DC Blocking Capacitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-58
Option 1EM Overall Cables - Includes Cables for Option UN7, 005, and 001/601 or 002/602. . . . . . . 2 -60
Option 1EM Semi-Rigid Cables - Includes the A21 YTO Driver and the AT1 High-Power Mechanical
Attenuator (Option UNB) with an A29 DC Blocking Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-63
Hardware and Other Instrument Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-65
Front Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-66
Disassembled Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-68
Rear-Panel Hardware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-71
Rear-Panel (Option 1EM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-74
Disassembled AT1 Electronic Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-77
Disassembled AT1 High-Power Mechanical Attenuator (Option UNB)
and A28 Reverse Power Protection (Option 501, 502, 503, 504 or Option UNJ). . . . . . . . . . . . . . . . . .2-78
vi
Contents
Disassembled AT1 High-Power Mechanical Attenuator (Option 506 Only) . . . . . . . . . . . . . . . . . . . . 2-80
Disassembled A6 Power Supply Shield and Left-Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-81
Disassembled A23 Motherboard and Bottom-Side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-82
Outside Instrument Covers and Associated Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-83
Inside Instrument Covers and Associated Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-85
Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-86
Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-86
Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-86
Abbreviations Used in Part Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-87
3. Assembly Replacement
Before You Replace an Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
After Replacing or Repairing an Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Assemblies That You Can Replace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Outer and Inner Instrument Covers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Removal Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
A1 Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
A2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
A2DS1 Display Backlight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
A3 Front Panel Auxiliary Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
vii
Contents
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-17
A4 Inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-19
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-19
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-19
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-19
A5 Hard Drive (E4438C Only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 -21
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-21
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-21
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-21
A6 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-24
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-24
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-24
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-24
A7 Baseband Generator (E4438C Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-26
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-26
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-26
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-26
A9 Digital Demodulator (E4438C Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-28
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-28
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-28
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-28
A10 I/Q Multiplexer (E4438C Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-30
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-30
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-30
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-30
A11 Internal Bit Error Rate Analyzer (E4438C Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-32
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-32
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-32
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-32
A12 CPU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-34
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-34
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-34
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-35
A13 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-36
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-36
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-36
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-36
viii
Contents
A14 Extended Frequency Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-38
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-38
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-38
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-38
A15 Sampler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-40
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-40
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-40
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-40
A16 Frac-N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-42
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-42
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-42
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-42
A17 Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-44
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-44
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-44
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-44
A18 Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-46
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-46
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-46
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-46
A19 Daughterboard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-48
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-48
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-48
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-48
A19 Daughterboard Cable Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-50
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-50
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-50
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-50
A20 Downconverter (E4438C Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-52
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-52
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-52
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-52
A21 YTO Driver and A22 Coupler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-54
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-54
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-54
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-55
A23 Motherboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-56
ix
Contents
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-56
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-56
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-57
A23BT1 Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-59
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-59
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-59
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-59
A24 Line Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 -60
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-60
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-60
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-60
Rear Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-62
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-62
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-62
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-62
A25 Rear Panel Board (E4438C Only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-64
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-64
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-64
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-64
A26 Rear Panel LVDS Board (Option 1EM — E4438C Only)
and A27 Rear Panel SMB Board (Option 1EM — E4438C Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-66
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-66
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-66
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-66
AT1 High-Power Mechanical Attenuator with A28 Reverse Power Protection. . . . . . . . . . . . . . . . . . . . . . .3-68
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-68
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-68
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-68
AT1 High-Power Mechanical Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-70
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-70
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-70
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-70
AT1 Electronic Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-72
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-72
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-72
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-72
A29 DC Blocking Capacitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-74
x
Contents
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-74
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-74
Removal Procedure for Option 1EM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-74
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-74
B1 Power Supply Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-76
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-76
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-76
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-76
B2 Small Fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-78
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-78
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-78
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-78
B3 Daughterboard/Card Cage Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-80
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-80
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-80
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-80
RF Output Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-82
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-82
Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-82
Removal Procedure for Option 1EM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-82
Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-83
4. Post-Repair Procedures
Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Adjustment Tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
5. Safety and Re gulatory
Safety Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
General Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Lithium Battery Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Certification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
xi
Contents
xii
Documentation Overview
Installation Guide
User’s Guide
• Safety Information
• Getting Started
• Operation Verification
• Regulatory Information
• E4428C Analog Signal Generator Overview
• E4423C Analog Signal Generator Overview
• Basic Operation
• Basic Digital Operation
• AWGN Waveform Generator
• Analog Modulation
• Digital Signal Interface Module
• Bluetooth Signals
• BERT
• CDMA Digital Modulation
• GPS Modulation
• Multitone Waveform Generator
• Custom Digital Modulation
• Real Time TDMA Formats
• W- CDMA Digital Modulation for Component Test
• W- CDMA Uplink Digital Modulation for Receiver Test
• W- CDMA Downlink Digital Modulation for Receiver Test
• Troubleshooting
Programming Guide
• Getting Started with Remote Operation
• Using IO Interfaces
• Programming Examples
• Programming the Status Register System
• Creating and Downloading Waveform Files
• Creating and Downloading User- Data Files
xiii
SCPI Reference Volum e 1:
• SCPI Basics
• Basic Function Commands
• System Commands
• Analog Commands
• Component Test Digital Commands
Volum e 2:
• Digital Signal Interface Module Commands
• Bit Error Rate Test (BERT) Commands
• Receiver Test Digital Commands
Volum e 3:
• Receiver Test Digital Commands (continued)
Compatibility with
E44xxB SCPI
Commands
Service Guide
Key and Data Field
Reference
• Overview
• E4428C/38C SCPI Commands
• ESG E44xxB Commands
• 8648A/B/C/D Commands
• 8658B, 8657A/B/D/J Programming Codes
• Troubleshooting
• Replaceable Parts
• Assembly Replacement
• Post- Repair Procedures
• Safety and Regulatory
Volum e 1:
• Symbols, Numerics, A- H
Volum e 2:
• Volum e 2: I- Z
xiv
1 Troubleshooting
1-1
Troubleshooting
Before Troubles hooting
Before Troubleshooting
WARNING These troubleshooting instructions are for use by qualified personal only. To avoid electrical shock, do
not perform any troubleshooting unless qualified.
WARNING The opening of covers or removal of parts is likely to expose dangerous voltages. Disconnect the signal
generator from all voltage sources before it is opened.
WARNING The following techniques related to ESD and static-safe workstations should not be used when working
on circuitry with a voltage potential greater than 500 volts.
ESD Information
Protection from Electrostatic Discharge
Electrostatic discharge (ESD) can damage or destroy electronic components. All work on electronic assemblies should be
performed at a static-safe workstation using two types of static-safe workstation protection:
• conductive table-mat and wrist-strap combination
• conductive floor-mat and heel-strap combination
Both types, when used together, provide a significant level of ESD protection. Of the two, only the table-mat and wrist-strap
combination provides adequate ESD protection when used alone. To ensure user safety, the static-safe accessories must
provide at least 1 meg ohm of isolation from ground.
Handling of Electronic Components and ESD
CAUTION Many of the assemblies in this signal generator are very susceptible to damage from electrostatic discharge
(ESD). Perform troubleshooting procedures only at a static-safe workstation and wear a grounding strap.
CAUTION Always handle printed circuit board assemblies by the edges. This will reduce the possibility of ESD damage
to components and prevent contamination of exposed plating.
The possibility of unseen damage caused by ESD is present whenever components are transported, stored, or used. The risk of
ESD damage can be greatly reduced by close attention to how all components are handled.
• Perform work on all components at a static-safe workstation.
• Keep static-generating materials at least one meter away from all components.
• Store or transport components is static-shielding containers.
1-2
Troubleshooting
Getting Started with Troubleshooting
Getting Started with Troubleshooting
Determine the starting point in Table 1-1 to begin troubleshooting.
• Problems should be worked on in the order they are presented in this table.
• Overviews of Self-Test, Frequency Synthesis, RF Path, Analog Modulation, and Digital Modulation are found in this
chapter. The information in these overviews may help the reader better understand how the signal generator operates and
the function of each assembly. Each overview is also intended to be used to troubleshoot the signal generator.
Table 1-1
If able to run self-test... Go to this section...
Run Self-Test “Self-Test Failures and Related Troubleshooting” on page 1-17
and refer to the procedure “Running Self-Test” on page 1-17.
If unable to run self-test, check... Go to this section...
Power Supply Fail u r e s
A12 CPU Power-on Failures
Front Panel Display
or Keyboard Operations
If other conditions occur... Go to this section...
Unlocked Conditions
Unleveled Conditions
Adjustment Problems
Performance Test Problems
I/Q Calibration Failure
“ILT-1 Power Supply Failure and Self-Test” on page 1-4
“ILT-2 A12 CPU Power-On Test” on page 1-4
“ILT3 Front Panel Display Troubleshooting” on page 1-8
“Troubleshooting Unlocks” on page 1-68
“Troubleshooting Unlevels and the RF Path” on page 1-73
“Troublesho ot ing A djus t ment Probl ems” on page 1-84
“Troubleshooting Performance Test Problems” on page 1-90
“Troubleshooting I/Q Calibration (E4438C Only)” on page 1-108
Troubleshooting Aids
• semi-rigid cable-extender probe
The Agilent E8251-20088 semi-rigid cable-extender probe is used for measuring signals from connectors that are located
inside the A19 Daughterboard card-cage.
• ribbon cable extender
The ribbon cable extender needs to be ass embled by the user. It consists of two connector plugs (part number 1252-1010)
and approximately eight inches of ribbon cable (part number 8120-22 26 ). The ribb on cable con t ains 2 6 wires; six o f these
wires, on either the right or the left side, need to be stripped off before being connected to the plugs.
1-3
Troubleshooting
Getting Started with Troubleshooting
ILT-1 Power Supply Failure and Self-Test
When the signal generator appears to be dead (no display or fan) there is often little evidence that points directly to th e cause.
This section provides steps and solutions to typical failure mod e s.
CAUTION Immediately unplug the signal generator from the ac power line if the unit shows any of the following
symptoms:
• Smoke, arcing, or unusual noise from inside the signal generator.
• A circuit breaker or fuse on the main ac power line opens.
These potentially serious faults must be corrected before proceeding.
Power Supply LED Checks
❏ Check the front panel LEDs (located next to the LINE switch) for normal operation in both standby and power-on
conditions. Normal operation is indicated as follows:
Table 1-2
Power Switch Yellow LED Green LED
Standby On Off
Power-On Off On
— If normal operation is not observed, refer to “Power Supplies” on page 1-21.
— If the fan does not operate when the signal generator is powered on, refer to the assembly level troubleshooting section
and verify the fan voltage.
— If the fan operates when the signal generator is powered on,
refer to “ILT-2 A12 CPU Power-On Test” on page 1-4.
ILT-2 A12 CPU Power-On Test
A12 CPU Power-On Test
At power-on, the A12 CP U is designed to complet e a series of operational checks. If all power supply vo ltages are present and
the A12 CPU is working correctly, the operational checks are completed. Errors are reported if the A12 CPU has problems
identifying other assemblies.
Failure Symptoms
• A2 Display is not functioning
• A12 CPU fails to complete the power-on check
• no LAN activity
• no signal generator control from the front panel
• error message is displayed after power-on
1-4
Getting Started with Troubleshooting
A2 Display is Not Functioning
Refer to ILT3 Front Panel Display Troubleshooting on page 1-8.
A12 CPU Fails to Complete the Power-On Check
1. Turn the power off and remove outer and inner covers.
2. Turn the pow er on and verify that LEDs DS18 through DS25 of the A12 CPU are on.
(Refer to Figure 1-1 for the location of LEDs DS18 through DS25 of the A12 CPU.)
• If any of the LEDs are off, turn the signal generator on its side
and check the voltages in Table 1-3 at the A23 Motherboard.
• If the voltages are not present on connector J15 and J5 of the A23 Motherboard,
refer to “Power Supplies” on page 1-21.
• If the voltages are present on connector J15 and J5 of the A23 Motherboard,
turn the power off and remove the A12 CPU.
3. Use a DVM and measure the resistance from J15 to J8 and J5 to J7.
• If the connector is open, change the A23 Motherboard.
Troubleshooting
• If the connector measures good, change the A12 CPU.
1-5
Troubleshooting
Getting Started with Troubleshooting
Figure 1-1 LEDs DS18 through DS25 of the A12 CPU
Table 1-3
Power Supply
Voltage (Vdc)
+15 J8-103 J15-103 +14.1 +15.9 DS22
−15 J8-43 J15-43 −15.9 −14.1 DS19
+32 J8-44 J15-44 +31.04 +32.96 DS23
+5.2 J7-59, 60, 119, 120 J5-59, 60, 119, 120 +4.68 +5.72 DS25
+3.4 J7-55, 56, 57, 58,
+9 J8-58 J15-58 +8.73 +9.27 DS20
−6 J8-57 J15-57 −6.36 −5.64 DS21
−5.2 J8-101 J15-101 −5.356 −5.044 DS18
Connector Pins on the Minimum
Value (Vdc)
A12 CPU A23 Motherboard
115, 116, 117, 118
J5-55, 56, 57, 58,
115, 116, 117, 118
+3.298 +3.502 DS24
Maximum
Value (Vdc)
LED on
top-right
corner of
A12 CPU
1-6
Troubleshooting
Getting Started with Troubleshooting
Verifying the A12 CPU Power-On Sequence
1. Before verifying the power-on s equen ce, en sure that all eight DIP switches of S1 are in the CLOSED (up) position. (Refer
to Figure 1-2 and locate S1 in the upper left-hand corner of the A12 CPU.)
2. Verify the A12 CPU power-on sequence by observing DS1 through DS8.
When the power-on sequence is complete, DS1 through DS7 should be on and DS8 should be off.
• If the lights fail to step through the sequence, replace A12 CPU.
(Refer to “A12 CPU” on page 3-34.)
Figure 1-2 S1 and LEDs DS1 through DS8 and DS11 through DS17 of the A12 CPU
Verifying the A5 10 GB Hard Drive
At power on, the hard drive’s file structure is verified.
• If the hard drive is not formatted, the A12 CPU formats it.
• If the file structure is corrupted, the A12 CPU recreates the structure; this may take up to 30 seconds during the power-on
sequence.
• If the power-on sequence does not complete, perform the following:
a. Turn power off to the signal generator.
b. Disconnect the hard drive’s W26 ribbon cable from P3 of the A12 CPU.
c. Turn power on to the signal generator.
— If the power-on sequence does not complete, refer to A12 CPU Fails to Complete the Power-On
Check<$elemparanumonly[Chapter]>-5.
— If the power-on sequence does complete, either the A5 10 GB Hard Drive or the A12 CPU hard drive interface is
bad; these can be isolated by substitution.
1-7
Troubleshooting
Getting Started with Troubleshooting
No LAN Activity
The signal generator supports 10-Base T-LAN. When the instrument is connected to an active LAN, a green LED (DS16)
should blink on the A12 CPU; the blinking LED repr esents data communication over the LAN. (Ref er to Fi gure 1- 2 and locate
DS16 in the upper middle of the A12 CPU.)
No Instrument Control From the Front Panel
Refer to ILT3 Front Panel Display Troubleshooting<$elemparanumonly[Chapter]>-8.
Error Messages Displayed After Power-On
If error messages are reported after the power-on check is completed, refer to the Error Messages manual for details.
ILT3 Front Panel Display Troubleshooting
The Front Panel Display consists of the following four assembli es:
• A1 Keyboard
• A2 Display (640 x 320 pixel liquid crystal display)
• A3 Front Panel Auxilary Board
• A4 Inverter
The A1 Keyboard contains the front panel hardkeys and softkeys, the power on/off switch along with the standby LED, and
the power-on LED. The eight LCD data lines for the A2 Display are routed through the A3 Front Panel Auxilary Board; the
A12 CPU controls these eight LCD data lines.
The A4 Inverter turns the A2 Dis play on and off using control lines rout ed throu gh the A3 Front Panel Auxilary Board, which
originate on the A12 CPU. The A4 Inverter is used to convert a +5.2 Vdc signal into a 40 kHz 290 Vac signal (approximately);
this ac signal is then used to drive the A2 Display.
A2 Display Contrast and Brightness Controls
There are two contrast hardkeys below the A2 Display. The left up-arrow key increases the contras t while the right
down-arrow key decreases the contrast.
The A2 Display brightness can be adjusted from 50 (high brightness) to 1 (low brightness) using the RPG, arrow keys, or the
numeric keypad.
Softkey Location:
A2 Display Tests
There are two screen tests for the A2 Display: the Black Pixel Screen Test and the White Pixel Screen Test.
The Black Pixel Screen Test turns the display dark and the White Pixel Screen Test turns the display bright. To exit either test,
press any front panel key.
Softkey Location:
Utility > Display > Brightness
Utility > Display > More (1 or 2)
Symptom: If the Display is Dark
The control lines for the A4 Inverter are routed from the A12 CPU through the A23 Motherboard
and the A3 Front Panel Auxilary Board to the A4 CN1 connector. The +5.2 Vdc is routed from the A6 Power Supply through
the A23 Motherboard and the A3 Front Panel Auxilary Board to the CN1 connector
of the A4 Inverter.
1-8
Figure 1-3 A4 Inverter Connections
Troubleshooting
Getting Started with Troubleshooting
❏ Check that the screen saver is not on.
— Press any front panel key to disable the screen saver.
❏ Check that the signal generator is powered-on and the front-panel green LED is lit.
— If the green LED is not lit, refer to Troubleshooting Assembly Level Problems on page 1-21.
WARNING High voltage is present at the A4 Inverter output (CN2-1). Also, while measuring CN2, be careful of the
fan blades on B1, B2, and B3. Keep hands and fingers away from the fan blades to avoid injury!
❏ Check the voltage, using a DVM, at the A4 Inverter output (CN2-1).
— To access this connector and measure the voltage:
1. Disconnect the front panel assembly from the chassis frame.
2. Slide the front panel display away from the chassis while ensuring that the ribbon cables to the
A23 Motherboard stay connected.
1-9
Troubleshooting
Getting Started with Troubleshooting
❏ Check that there is approximately 290 Vac, 40 kHz signal at CN2-1. (This check should be made with the A4 Inverte r
connected to the A2 Display.)
— If the signal is present at the A4 Inverter output, replace the A2 Display.
(Refer to “A2 Display” on page 3-11.)
— If the signal is not present at CN2, use a DVM to measure the signals shown in Table 1-4 at CN1 on the A4 Inverter.
Probe CN1 from the top of the connector while it is still connected to the A3 Front Panel Auxilary Board.
Table 1-4
Signal State
CN1-1 5.2 Vdc
CN1-3 LIGHT_EN >3 Vdc
CN1-4 VDISP Brightness = 50, VDSP < 50 mVdc
Brightness = 1, VDSP = 3 Vdc
— If the signals in Table 1-4 are correct, replace the A4 Inverter.
(Refer to “A4 Inverter” on page 3-19.)
— If any of the signals are incorrect:
a. Using a DVM, measure the signals shown in Table 1-5 at J30 of the A23 Motherboard.
— If the signals in Table 1-5 are correct, replace the A3 Front Panel Auxilary Board.
(Refer to “A3 Front Panel Auxiliary Board” on page 3-17.)
— If the 5.2 VD_LCD line is incorrect, refer to the “ILT-1 Power Supply Failure and Self-Test” on page 1-4.
— If either the LIGHT_EN or VDISP are incorrect:
a. Using a DVM, measure the signals at J15-37 (LIGHT_EN)
or J15-97 (VDISP) of the A23 Motherboard.
— If either signal is incorrect, replace the A12 CPU.
(Refer to “A12 CPU” on page 3-34.)
Table 1-5
Signal State
J30-32 5.2 VD_LCD 5.2 Vdc
J30-20 LIGHT_EN >3 Vdc
J30-30 VDISP Brightness = 50, VDSP < 50 mVdc
Brightness = 1, VDSP = 3 Vdc
1-10
Troubleshooting
Getting Started with Troubleshooting
Symptom: If the Display is Bright, but without Characters
❏ Check that the signal generator is powered-on and the front panel green LED is lit. If the green LED is not lit, refer to the
Power Supply Troubleshooting section in this manual. Press any front panel key to disable the screen saver.
— If the green LED is lit and the display is too bright, try adjusting the contrast controls on the front panel. Refer to
“Symptom: If the Display is Dark” on page 1-8.
— If adjusting the contrast controls has no effect, use an oscilloscope to check the signals in Table 1-6. The pulse-state
signals listed are control, clock, and dat a lin es fo r th e A2 Disp lay. Probe the signals on the back of the ribbon cable on
P1 of the A3 Front Panel Auxilary Board.
Table 1-6
Signal State
J1-7 VLCD approximately 21 Vdc
J1-4 LCD_EN_L >3 Vdc
J1-5 5.2 Vdc
J1-8 to 15 Refer to Figure 1-4.
— If the signals in Table 1-6 are correct, replace the A2 Display.
(Refer to “A2 Display” on page 3-11.)
— If the signals are incorrect, use an oscilloscope to check J30 on the A23 Motherboard for signals shown in Table 1-7.
Table 1-7
Signal State
J30-3 VLCD approximately 21 Vdc
J30-5 LCD_EN_L >3 Vdc
Pulsing Activity LCD_DATA
J1-8 to 15; J30-13, 14, 17, 18, 23, 24, 27, 28; J15-24, 25, 28, 29, 32, 33, 86, 90
Pulsing Activity LCD_CLK
J1-3; J30-4; J15-94
Pulsing Activity LCD_LOAD
J1-2; J30-8; J15-36
Pulsing Activity LCD_FRAME
J1-1; J30-7; J15-93
Figure 1-4 Pulsing Activity LCD_DATA
J1-8 to 15; J30-13, 14, 17, 18, 23, 24, 27, 28; J15-24, 25, 28, 29, 32, 33, 86, 90
Refer to Figure 1-4.
Refer to Figure 1-5.
Refer to Figure 1-6.
Refer to Figure 1-7.
1-11
Troubleshooting
Getting Started with Troubleshooting
Figure 1-5 Pulsing Activity LCD_CLK
J1-3, J30-4, J15-94
Figure 1-6 Pulsing Activity
J1-2, J30-8, J15-36
Figure 1-7 Pulsing Activity
J1-1, J30-7, J15-93
— If the signals in Table 1-7 are correct, replace the A3 Front Panel Auxilary Board.
(Refer to “A3 Front Panel Auxil iary Board” on page 3-17.)
— If any of the signals are incorrect, use an oscilloscope to check J15 on the A23 Motherboard for
signals shown in Table 1-8.
Table 1-8
Signal State
J15-35 VLCD approximately 21 Vd c
J15-95 LCD_EN_L >3 Vdc
J15-24, 25, 28, 29, 32, 33, 36, 86, 90, 93, 94 Refer to Figure 1-4.
— If the signals in Table 1-8 are incorrect, replace the A12 CPU (Refer to “A12 CPU” on page 3-34).
1-12
Troubleshooting
Getting Started with Troubleshooting
Symptom: If Hardkeys or Softkeys are Not Functioning
The A1 Keyboard contains the switches for the hardkeys and softkeys. These hardkeys and softkeys are arranged in a matrix,
as shown in Table 1-9, with the control lines KEYCOLx and KEYROWy on the x and y-axis. When a hardkey or softkey is
pressed, one cell of the matrix is activated. The no rmally TTL low KEYROWy, of the active cell, will pulse high and the
normally TTL high KEYCOLx, of the active cell, will pulse low. These TTL signals may be measured with an oscilloscope at
J32 on the A23 Motherboard. Use Tabl e 1-9 for hardkey and softkey matrix locations.
Figure 1-8 J30 and J32 of the A23 Motherboard
❏ Ensure that the signal generator is powered-on, that the front panel green LED is lit, and that the signal generator is not
being controlled remotely.
— If the signal generator is powered-on and the green LED is lit:
a. Press the Local hardkey to place the signal generator in local-control mode.
b. Press any suspected defective hardkeys or softkeys while monitoring their corresponding KEYCOLx and
KEYROWy line at J32 of the A23 Motherboard.
— If either signal is incorrect, refer to the Table 1-10 and check the signal at J15
on the A23 Motherboard.
J15 is where the signal leaves the A12 CPU.
— If the signal is incorrect at J15, replace the A12 CPU.
(Refer to “A12 CPU” on page 3-34.)
— If both signals at the J32 and J15 conn ectors are correct, replace the A1 Keyboard.
(Refer to “A1 Keyboard” on page 3-8.)
— If the signal generator is powered-on and the green LED is not lit,
refer to “Power Supplies” on page 1-21.
1-13
Troubleshooting
Getting Started with Troubleshooting
Table 1-9 A1 Keyboard Control Lines (KEYCOLx and KEYROWy)
KEYROW0
J32-17
KEYROW1
J32-19
KEYROW2
J32-21
KEYROW3
J32-23
KEYROW4
J32-25
KEYROW5
J32-26
KEYROW6
J32-24
KEYROW7
J32-22
KEYCOL0
J32-1
Softkey 3 NA Cont Up NA NA Mode Menu Mode Sel NA
Softkey 2 Incr/Set Cont Down Ampl Ampl Menu AM Pulse Utility
Softkey 1 Up NA Freq Freq Menu FM/ΦMDig ModCal
Softkey 4NANARight
Softkey 6 NA Local Hold Mod
Softkey 5 NA Return Down
NA NA NA Left Arrow RF On/Off 0 . +/−
Softkey 7NAPresetNANA1 2 3
KEYCOL1
J32-3
KEYCOL2
J32-5
KEYCOL3
J32-7
Arrow
Arrow
KEYCOL4
J32-9
Help Save Recall Trigger
On/Off
NA 7 8 9
Table 1-10 J15 Control Lines (KEYCOLx and KEYROWy)
KEYCOL5
J32-11
456
KEYCOL6
J32-13
KEYCOL7
J32-15
KEYROW0 J32-17 J15-111 KEYCOL0 J32-1 J15-46
KEYROW1 J32-19 J15-51 KEYCOL1 J32-3 J15-47
KEYROW2 J32-21 J15-112 KEYCOL2 J32-5 J15-108
KEYROW3 J32-23 J15-52 KEYCOL3 J32-7 J15-48
KEYROW4 J32-25 J15-53 KEYCOL4 J32-9 J15-109
KEYROW5 J32-26 J15-114 KEYCOL5 J32-11 J15-49
KEYROW6 J32-24 J15-54 KEYCOL6 J32-13 J15-110
KEYROW7 J32-22 J15-55 KEYCOL7 J32-15 J15-50
Figure 1-9 J15 of the A23 Motherboard
1-14
Troubleshooting
Getting Started with Troubleshooting
Symptom: If the RPG Knob is Not Functioning
When the RPG Knob is functioning properly, DS11 on the A12 CPU should blink each time that the RPG knob is rotated.
Figure 1-10 Blinking of DS11 Indicates RPG Knob Activity
• Ensure that the signal generator is powered-on and that the front panel green LED is lit.
— If the green LED is lit and the RPG knob is not functioning:
a. Check J32-12 for +5.2 VD_LCD.
— If the voltage is present on J32-12:
a. Press the Frequency hardkey on the front panel.
b. Using an oscilloscope, monitor J32-14 and J32-10 while r otating the RPG knob.
The display frequency value should change and both signals at J32-14 and J32-10 should pulse to a TTL
high.
— If either of the signals do not pulse to a TTL high, replace the A1 Keyboard.
(Refer to “A1 Keyboard” on page 3-8.)
— If the signals are pulsing to a TTL high:
a. Check the signal at J15-106 and J15-107 of the A23 Motherboard.
— If the signals are pulsing to a TTL high, replace the A12 CPU.
(Refer to “A12 CPU” on page 3-34.)
— If the voltage is not present on J32-12, refer to “Power Supplies” on page1-21.
— If the green LED is not lit, refer to “Power Supplies” on page 1-21.
Figure 1-11 J30 and J32 of the A23 Motherboard
1-15
Troubleshooting
Getting Started with Troubleshooting
Symptom: If the Screen Saver is Not Functioning
The screen saver delay may be set for any integer from 1 to 12 hours. The A12 CPU controls the screen saver by pulling the
LIGHT_EN line low.
• Ensure that the signal generator is powered-on and that the front panel green LED is lit.
— If the green LED is lit, the delay time has elapsed, and the display hasn’t gone dark:
a. Check the LIGHT_EN signal at J30-20. (Refer to Figure 1-11.)
— If the signal is a TTL low, replace the A4 Inverter.
(Refer to “A4 Inverter” on page 3-19.)
— If the signal is a TTL high:
a. Check J15-37 of the A23 Motherboard. (Refer to Figure 1-9.)
— If the signal is a TTL high, replace the A12 CPU.
(Refer to “A12 CPU” on page 3-34.)
— If the green LED is not lit, refer to “Power Supplies” on page 1-21.
1-16
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