Keysight Technologies E8257D, E8663D, E8267D Service Manual

Keysight
E8257D/67D and E8663D
PSG Signal Generators

Notice: This document contains references to Agilent.
Please note that Agilent’s Test and Measurement
business has become Keysight Technologies. For
more information, go to www.keysight.com.

Service Guide

Notices

© Keysight Technologies, Inc.
2004-2017

No part of this manual may be
reproduced in any form or by any
means (including electronic storage
and retrieval or translation into a
foreign language) without prior
agreement and written consent from
Keysight Technologies, Inc. as
governed by United States and
international copyright laws.

Trademark Acknowledgments

Manual Part Number

E8251-90359

Edition

Edition 1, July 2017

Supersedes January 2017

Printed in USA/Malaysia

Published by:
Keysight Technologies

1400 Fountaingrove Parkway
Santa Rosa, CA 95403

Warranty

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, KEYSIGHT
DISCLAIMS ALL WARRANTIES,
EITHER EXPRESS OR IMPLIED WITH
REGARD TO THIS MANUAL AND
ANY INFORMATION CONTAINED
HEREIN, INCLUDING BUT NOT
LIMITED TO THE IMPLIED
WARRANTIES OF
MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE.
KEYSIGHT 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 INFORMATION
CONTAINED HEREIN. SHOULD
KEYSIGHT AND THE USER HAVE A
SEPARATE WRITTEN AGREEMENT
WITH WARRANTY TERMS

COVERING THE MATERIAL IN THIS
DOCUMENT THAT CONFLICT WITH
THESE TERMS, THE WARRANTY
TERMS IN THE SEPARATE
AGREEMENT WILL CONTROL.

Technology Licenses

The hard ware and/or software
described in this document are
furnished under a license and may be
used or copied only in accordance
with the terms of such license.

U.S. Government Rights

The Software is “commercial
computer software,” as defined
by Federal Acquisition Regulation
(“FAR”) 2.101. Pursuant to FAR

12.212 and 27.405-3 and
Department of Defense FAR
Supplement (“DFARS”) 227.7202,
the U.S. government acquires
commercial computer software
under the same terms by which
the software is customarily
provided to the public.
Accordingly, Keysight provides
the Software to U.S. government
customers under its standard
commercial license, which is
embodied in its End User License
Agreement (EULA), a copy of
which can be found at

http://www.keysight.com/find/sweula

The license set forth in the EULA
represents the exclusive authority
by which the U.S. government
may use, modify, distribute, or
disclose the Software. The EULA
and the license set forth therein,
does not require or permit,
among other things, that
Keysight: (1) Furnish technical
information related to
commercial computer software
or commercial computer
software documentation that is
not customarily provided to the
public; or (2) Relinquish to, or
otherwise provide, the
government rights in excess of
these rights customarily provided
to the public to use, modify,
reproduce, release, perform,
display, or disclose commercial
computer software or
commercial computer software

documentation. No additional
government requirements
beyond those set forth in the
EULA shall apply, except to the
extent that those terms, rights, or
licenses are explicitly required
from all providers of commercial
computer software pursuant to
the FAR and the DFARS and are
set forth specifically in writing
elsewhere in the EULA. Keysight
shall be under no obligation to
update, revise or otherwise
modify the Software. With
respect to any technical data as
defined by FAR 2.101, pursuant
to FAR 12.211 and 27.404.2 and
DFARS 227.7102, the U.S.
government acquires no greater
than Limited Rights as defined in
FAR 27.401 or DFAR 227.7103-5
(c), as applicable in any technical
data.

Safety Notices

A CAUTION notice denotes a hazard. It
calls attention to an operating
procedure, practice, or the like that,
if not correctly performed or adhered
to, could result in damage to the
product or loss of important data. Do
not proceed beyond a CAUTION
notice until the indicated conditions
are fully understood and met.

A WARNING notice denotes a hazard.
It calls attention to an operating
procedure, practice, or the like that,
if not correctly performed or adhered
to, could result in personal injury or
death. Do not proceed beyond a
WARNING notice until the indicated
conditions are fully understood and
met.

Where to Find the Latest Information

Documentation is updated periodically. For the latest information about these products, including instrument software
upgrades, application information, and product information, browse to one of the following URLs, according to the name
of your product:

http://www.keysight.com/find/psg

To receive the latest updates by email, subscribe to Keysight Email Updates at the following URL:

http://www.keysight.com/find/MyKeysight

Information on preventing instrument damage can be found at:

www.keysight.com/find/PreventingInstrumentRepair

Is your product software up-to-date?

Periodically, Keysight releases software updates to fix known defects and incorporate product enhancements. To search
for software updates for your product, go to the Keysight Technical Support website at:

http://www.keysight.com/find/techsupport

3

4

Table of Contents

1. Troubleshooting

Electrostatic Discharge (ESD) Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Handling of Electronic Components and ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Getting Started with Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Running Self–Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

A18 CPU Turn–On Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Failure Symptoms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

A2 Display Not Functioning or A2 Display Not Functioning After Turn–on . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

A18 CPU Fails to Complete the Turn–On Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Checking the A18 CPU Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Verifying the A18 CPU Turn–On Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

No Instrument Control From the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

CPU Data Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Self–Test Failures and Related Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Troubleshooting Assembly–Level Problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Front–Panel Display Assembly Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Power Supply Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Option 008/009 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Self–Tests 1xx for the A13 I/Q Multiplexer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Self–Tests 2xx: A5 Sampler Self–Test Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Self–Tests 3xx: A7 Reference (Standard) Self–Test Errors (For instruments with serial prefixes <

US4805/MY4805) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Self–Tests 4xx: A8 Output Self–Test Errors (E8267D only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Self–Tests 6xx: A9 YIG Driver Self–Test Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Self–Tests 7xx: A6 Frac–N Self–Test Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Self–Tests 7xx: A45 Frac–N Self–Test Errors (option UNY). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Self–Tests 9xx: A10 ALC Self–Test Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Self–Tests 10xx: A7 Reference (Option UNR/UNX and Instruments with Serial Prefixes ≥ US4805/MY4805)

Self–Test Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Self–Tests 11xx: A18 CPU Self–Test Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Self–Tests 12xx: A26 MID Self–Test Errors (E8257D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Self–Tests 12xx: A26 MID Self–Test Errors (E8267D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Self–Tests 13xx: A11 Analog/Pulse Modulation Generator Self–Test Errors . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Self–Tests 16xx for the A14 Baseband Generator (Option 601/602). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92

Self–Tests 22xx: A8 Output Self–Test Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Self–Tests 24xx: A38 Lowband Filter Self–Test Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Self–Tests 25xx: A43 Amp Filter Self–Test Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Self–Tests 26xx: A8 Output Self–Test Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Self–Tests 27xx: A46 Offset Loop Self-Test Errors (Option UNY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Self–Tests 28xx: A8 Vector Output Self-Test Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Troubleshooting Unlocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

508 A6 Frac–N Loop Unlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

512 A7 Reference Unlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

513 1 GHz Out of Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Contents

5

Contents

514 Reference Oven Cold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

515 10 MHz Signal Bad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

520 Sampler Unlocked . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

521 YO Loop Unlocked . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

625 Internal Pulse Generator Unlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

626 Internal Mod Source Unlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Troubleshooting Unlevels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Troubleshoot and correct any unlock problems before troubleshooting unleveled problems. . . . . . . . . . . . . 108

Troubleshooting Adjustment Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Troubleshooting ADC Adjustment Failures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Troubleshooting Performance Test Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Troubleshooting the RF Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Troubleshooting RF Power Levels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

ALC and RF problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Troubleshooting Pulse Modulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

Troubleshooting AT1 Attenuator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Troubleshooting Harmonic Spurious . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

20 GHz Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

20 GHz Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

32 GHz and 44 GHz Models Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

40 GHz Models Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

50 and 67 GHz Models Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Troubleshooting Non–Harmonic Spurious. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Troubleshooting Option UNR/UNX/UNY and Instruments with Serial Prefixes ≥ US4805/MY4805 Phase Noise 133

Overall Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

A18 CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

A19 Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

Input/Output Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

Frequency Generation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

Overall PSG Analog Signal Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Overall PSG Vector Signal Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

Reference/Synthesis Loop Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147

A5 Sampler (CW mode only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

A6 Frac–N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

A7 Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

A9 YIG Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

A28 YIG Oscillator (YO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

A29 20 GHz Doubler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

A38 Switch Filter and A43 Lowband Amp Filter (Option 1EH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

Reference/Synthesis Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

RF Path Description (Frequency Generation, Level Control, and Modulation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

A6 Frac–N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

A8 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

A12 <3.2 GHz Fast Pulse Modulator (Option UNW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

A23 Lowband Coupler/Detector, A24 Highband Coupler, and A25 High Band Detector . . . . . . . . . . . . . . . 158

A27 40 GHz Doubler (Analog 40 GHz Models and Vector 44 GHz Models) . . . . . . . . . . . . . . . . . . . . . . . . . . 158

6

Contents

A29 20 GHz Doubler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

A30 Modulation Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

A35 3–20 GHz I/Q Modulator (Vector Models Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

A36 Quadraplier (Analog Models > 40 GHz). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

A37 44 GHz Upconverter (Vector Models > 20 GHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

ALC Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Modulation (Option UNT–AM, FM, ΦM, UNU–Standard Pulse, and UNW–Fast Pulse) . . . . . . . . . . . . . . . . . 162

Digital Modulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

Approximate Device Gains and Losses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

Analog RF Path Block Diagram (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

Analog RF Path Block Diagram (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

Analog Low Band RF Path Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

Analog and Vector Option UNY Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173

Vector RF Path Block Diagram (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Vector RF Path Block Diagram (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

Vector Low Band RF Path. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179

Self–Test Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

How self–test works: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Independent failures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Contacting Keysight Technologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

Keysight Sales and Service Offices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Packaging a Signal Generator for Return. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

2. Replaceable Parts

Ordering Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Order Parts Fast. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Frequency, Hardware, and Personality Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188

Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

Assemblies from the Inside Front Panel View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196

Assemblies from a Top View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198

Assemblies from a Microcircuit Deck View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203

Assemblies from a Bottom View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206

A18BT1 Lithium Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220

Front Panel View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221

Disassembled Front Panel View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224

Disassembled Rear Panel View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226

Disassembled A32 10 MHz Crystal Oscillator (Option UNR/UNX/UNY and Instruments with Serial

Prefixes ≥ US4805/MY4805) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229

Disassembled AT1 90dB/115dB Attenuator View (Option 1E1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231

Disassembled A24 20GHz/40GHz Highband Coupler and A25B Highband Detector Bias Board

(Options 503, 509, 513, 520, and 540) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232

Disassembled A24 20GHz Highband Coupler and A25B Highband Detector Bias Board (Option 521). . . . . 233

Disassembled A24 50GHz Highband Coupler and A25B Highband Detector Bias Board . . . . . . . . . . . . . . . 234

Disassembled A24 67GHz Highband Coupler and A25B Highband Detector Bias Board . . . . . . . . . . . . . . . 235

7

Contents

Microcircuit Interface Deck Top View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236

Main Chassis and MID Bottom View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237

1.85 mm RF Output Connector (Option 567 Only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240

2.4 mm RF Output Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241

APC 3.5 RF Output Connector (Options 513 and 520 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242

Type-N RF Output Connector (Option 1ED Models Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243

Main Chassis with Inside Cover and Right-Side Support Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244

Outer and Inner Instrument Covers and Associated Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246

Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249

Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249

Electrostatic Discharge (ESD) Protective Supplies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249

Abbreviations Used in Part Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251

3. Assembly Replacement

Before You Replace an Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253

After Replacing or Repairing an Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253

Assemblies That You Can Replace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254

Outer Instrument Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

Removal Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

Inner Instrument Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260

Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262

Removal Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264

A1 Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

A2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269

A2DS1 Display Backlight

(serial number prefix < US/MY5XXX3XXX only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272

A3 Power Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274

8

Contents

A4 Inverter (serial number prefix < US/MY5XXX3XXX only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

A5 Sampler, A6 Frac–N, A7 Reference
(Standard and Option UNR/UNX/UNY), A8 Output,

A45 Frac-N and A46 Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

A9 YIG Driver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281

A10 ALC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283

A11 Pulse/Analog Modulation Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285

A12 Pulse Modulator Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287

A13 I/Q MUX (E8267D Standard or with Option 015)

(Serial Prefixes <US4722/MY4722) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289

A13 I/Q MUX (E8267D Standard or with Option H16/016)

(Serial Prefixes ≥ US4722/MY4722) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292

A14 Baseband Generator (E8267D Only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293

A17 Baseband Generator Interface (E8267D Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295

A18 CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297

9

Contents

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297

A18BT1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299

A19 Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302

A20 SMI (Source Module Interface) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304

Removal Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304

A21 Rear–Panel Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306

A22 Line Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308

Removal Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308

A23 Lowband Coupler/Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310

Removal Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310

A24 20 GHz Highband Coupler

(Options 503, 509, 513, 520, and 521) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312

Removal Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313

A24 40 GHz Highband Coupler (Option 540). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317

Removal Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317

A24 50 GHz Highband Coupler (Options 532 and 544). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319

Removal Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319

A24 67 GHz Highband Coupler (Options 550 and 567). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321

Removal Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321

A25 20 GHz Highband Detector (Options 503, 509, 513, 520, & 521) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323

Removal Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323

A25 40 GHz Highband Detector (Option 540) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326

10

Contents

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326

A25 50 GHz Highband Detector (Options 532 and 544) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328

A25 67 GHz Highband Detector (Options 550 and 567) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330

A25B Highband Detector Bias Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332

A26 MID (Microcircuit Interface Deck) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335

A27 40 GHz Doubler (Option 540) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337

A27 40 GHz Doubler (Options 532 and 544 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339

A28 YIG Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341

A29 20 GHz Doubler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343

A30 Modulation Filter (Standard and Option 1EA/1EU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346

A31 Motherboard (E8257D & E8663D). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349

A31 Motherboard (E8267D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 352

11

Contents

A32 10 MHz Crystal Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354

Removal Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354

A33 6dB PAD (Options 503, 509, 513, 520, and 521) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356

A33 10dB PAD (Options 532 and 544). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358

Rear Panel (Standard). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360

Removal Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 361

Rear Panel (Option 1EM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363

Removal Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365

A34 Internal Hard Drive (E8267D Only - Discontinued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367

A35 3–20 GHz I/Q Modulator (E8267D Only - Standard or with Option 015) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369

A35 3–20 GHz I/Q Modulator (E8267D Only - Standard or with Option H16/016) (Serial Prefixes ≥ US4722/MY4722)
371

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371

A36 Quadraplier (Options 550 and 567) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373

Removal Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373

A37 Upconverter (E8267D Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375

A38 Lowband Switch Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377

A39 Directional Sweep Coupler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379

12

Contents

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379

A40 Compact Flash Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 381

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 381

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 381

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 381

A41 Flash Drive Door Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383

A42 20 GHz Power Amp (Option 521) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385

A43 Lowband Amp Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387

A44 Scan Modulation Bias Adapter (E8257D-520 and E8663D Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389

AT1 90 dB Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391

AT1 115 dB Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 393

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 393

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 393

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 393

AT1 90 dB Attenuator (Option 1EM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395

AT1 115 dB Attenuator (Option 1EM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 397

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 397

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 397

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 397

B1 Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399

Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399

Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399

Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399

4. Post–Repair Procedures

Post–Repair Procedures Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402

CPU Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415

13

Contents

5. Safety and Regulatory

General Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 420

Lithium Battery Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421

Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421

Certification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421

14

Documentation Overview

Installation Guide

User’s Guide

— Safety Information

— Getting Started

— Operation Verification

—Regulatory Information

— Signal Generator Overview

— Basic Operation

— Basic Digital Operation

— Optimizing Performance

— Analog Modulation

— Custom Arb Waveform Generator

— Custom Real Time I/Q Baseband

— Multitone Waveform Generator

— Two-Tone Waveform Generator

— AWGN Waveform Generator

Programming Guide

—Peripheral Devices

— Troubleshooting

— 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

Keysight E8257D/67D & E8663D PSG Signal Generators Service Guide 15

SCPI Reference

— Using this Guide

— System Commands

— Basic Function Commands

— Analog Commands

— Digital Modulation Commands

— Digital Signal Interface Module Commands

— SCPI Command Compatibility

Service Guide

Key Reference

— Troubleshooting

— Replaceable Parts

— Assembly Replacement

— Post-Repair Procedures

— Safety and Regulatory Information

— Key function description

16 Keysight E8257D/67D & E8663D PSG Signal Generators Service Guide

Keysight PSG Signal Generators
E8257D/67D, E8663D

Service Guide

1 Troubleshooting

— “Electrostatic Discharge (ESD) Information” on page 18

— “Getting Started with Troubleshooting” on page 20

— “A18 CPU Turn–On Test” on page 22

— “Self–Test Failures and Related Troubleshooting” on page 25

— “Troubleshooting Assembly–Level Problems” on page 30

— “Troubleshooting Unlocks” on page 104

— “Troubleshooting Unlevels” on page 108

— “Troubleshooting Adjustment Problems” on page 116

— “Troubleshooting ADC Adjustment Failures” on page 119

— “Troubleshooting Performance Test Problems” on page 120

— “Troubleshooting the RF Path” on page 122

— “Troubleshooting Harmonic Spurious” on page 127

— “Troubleshooting Non–Harmonic Spurious” on page 132

— “Troubleshooting Option UNR/UNX/UNY and Instruments with Serial

Prefixes ≥ US4805/MY4805 Phase Noise” on page 133

— “Overall Description” on page 134

— “Reference/Synthesis Loop Description” on page 147

— “RF Path Description

(Frequency Generation, Level Control, and Modulation)” on page 155

— “Self–Test Overview” on page 181

— “Contacting Keysight Technologies” on page 183

Troubleshooting instructions are for use by qualified personnel only. To avoid
electrical shock, do not perform any troubleshooting unless qualified.

The opening of covers or removal of parts is likely to expose dangerous voltages.
Disconnect the signal generator from all vol tage sources before it is opened.

17

Troubleshooting
Electrostatic Discharge (ESD) Information

Electrostatic Discharge (ESD) Information

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 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 MΩ of isolation from ground.

18 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Electrostatic Discharge (ESD) Information

Handling of Electronic Components and ESD

Many of the assemblies in this instrument are very susceptible to damage from
ESD. Perform troubleshooting procedures only at a static–safe workstation, and
wear a grounding strap.

Always handle a printed circuit board assembly by its edges. This reduces 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.

E8257D/67D, E8663D PSG Signal Generators Service Guide 19

Troubleshooting
Getting Started with Troubleshooting

Getting Started with Troubleshooting

Referring to Table 1-1:

— determine where to begin troubleshooting

— work on problems in the order they are presented in the table

— use the descriptions provided in this chapter that explain how the signal

generator operates, and the function of each assembly: the overall
description (page 1-134), the synthesis loop (page 1-147), the RF path
(page 1-155), and self–test (page 1-181).

Table 1-1

If able to run sel f–test... Go to this section...

Run Self–Test “Running Self–Test” on page 21 and refer to

“Self–Test Failures and Related Troubleshooting” on page 25.

If unable to run sel f–test, check... Go to this section...

Power supply failures

A18 CPU turn–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

“Power Supply Troubleshooting” on page 37

“A18 CPU Turn–On Test” on page 22

“Front–Panel Display Assembly Troubleshooting” on page 30

“Troubleshooting Unlocks” on page 104

“Troubleshooting Unlevels” on page 108

“Troubleshooting Adjustment Problems” on page 116

“Troubleshooting Performance Test Problems” on page 120

20 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Getting Started with Troubleshooting

Running Self–Test

A bad assembly can cause other assemblies to fail. The internal failure tree will
identify the most likely failed assembly and report it as the “most independent
failure.” Troubleshoot and replace that assembly before troubleshooting and
replacing other assemblies.

When you replace an assembly a good assembly will pass self–test without any
adjustments.

1. On the instrument front panel, press the Utility hardkey.

2. Select the following softkeys:

a. Instrument Info/Help Mode

b. Self Test

c. Run Complete Sel f Test

3. When the Self–Test finishes, one of the following messages displays:

— If the Self Test passed: “The current status of self test is: Success All

self tests have passed.”

— If the Self–Test failed: “The current status of self test is: Failed.” The

message also reports the most independent failure.

4. If the Self–Test failed, look up the reported most independent failure in the

“Self–Test Failures and Related Troubleshooting” section on page 25.

5. Troubleshoot and repair the most independent failure.

6. After you replace the failed assembly, run the Self–Test again.

7. If another assembly is reported as the most independent failure, repeat

steps 4 thru 6 until the Self–Test passes.

E8257D/67D, E8663D PSG Signal Generators Service Guide 21

Troubleshooting
A18 CPU Turn–On Test

A18 CPU Turn–On Test

If it is determined that the A18 CPU is defective but still functions, it is
recommended that you back up the calibration data in the CPU prior to replacing
it. To back up the calibration data, see “CPU Data Backup” on page 24.

At turn–on, the A18 CPU is designed to complete a series of operational
checks. If all power supply voltages are present and the A18 CPU is working
correctly, the operational checks are completed. Errors are reported if the
A18 CPU has problems identifying other assemblies or communicating with the
backup memory located on the A31 Motherboard.

Failure Symptoms

— display is not functioning

— CPU fails to complete the turn–on check and does not reach normal LCD

operation

Table 1-2

— display is not functioning after turn–on

— unable to control signal generator from front panel

— error message is displayed after turn–on

A2 Display Not Functioning or A2 Display Not Functioning After
Turn–on

Refer to “Front–Panel Display Assembly Troubleshooting” on page 30.

A18 CPU Fails to Complete the Turn–On Check

1. Turn power off and remove outer and inner covers.

2. Turn on power and verify A18 CPU LED DS9 (+3.4 Vdc) and DS10

(+5.2 Vdc) are on. If either of the LEDs are off, check the voltages in Table

1-2. Refer to the illustration in “Self–Tests 11xx: A18 CPU Self–Test
Errors” on page 76 for LED locations.

Connector P222
(A31 Motherboard)

Supply Voltage Acceptable Range

Pin 45–48, 95–98 +3.4 Vdc +3.4 ± 0.07 Vdc

Pin 49, 50, 99, 100 +5.2 Vdc +5.2 ± 0.1 Vdc

3. If the voltages are present on connector P222, turn power off and remove
the A18 CPU.

22 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
A18 CPU Turn–On Test

4. Inspect the pins on the A31 Motherboard connector. If the pins look good
replace the A18 CPU.

5. If either of the voltages are missing, refer to “Power Supply

Troubleshooting” on page 37.

6. If DS9 and DS10 are on, proceed to “Checking the A18 CPU Voltages” on

page 23.

Checking the A18 CPU Voltages

1. With the external and internal covers removed and the signal generator on
its side, turn power on and check to see if all the power supply LEDs on the
A31 Motherboard are on. If any of the power supply LEDs are not on, refer
to “Power Supply Troubleshooting” on page 37 to troubleshoot.

2. If all the power supply LEDs on the motherboard are on, check the A18
CPU and A31 Motherboard connector pins for the voltages listed in the
following table.

Connector Supply Voltage Acceptable Range

P223–2, 22 +5 VA +5.2 ± 0.16 Vdc

P223–3 −15 V_In −15 ± 0.45 Vdc

P223–4 +32 V_In +32 ± 0.96 Vdc

P223–21 +15 V_Standby +14.85 ± 0.6 Vdc

P223–23 +15 V_In +15 ± 0.75 Vdc

P223–37 −7 Vdc −7.0 ± 0.14 Vdc

P223–39 +10 Vdc +10.2 ± 0.2 Vdc

P223–40 +8 Vdc +7.95 ± 0.21 Vdc

3. If any main power supply voltage problems are detected, refer to “Power

Supply Troubleshooting” on page 37.

4. If all power supply voltages are good, replace A18 CPU.

Verifying the A18 CPU Turn–On Sequence

Verify the A18 CPU turn–on sequence by observing DS1 to DS8 sequence
patterns (See the diagram on page 76 for LED locations). DS1 to DS8 should
match the sequence shown in Tab le 1-3. Before verifying the turn–on
sequence, make sure all switches in the upper left–hand corner of the A18 CPU
are in the CLOSED (up) position. If the lights fail to step through the sequence,
replace A18 CPU.

E8257D/67D, E8663D PSG Signal Generators Service Guide 23

Troubleshooting
A18 CPU Turn–On Test

Table 1-3 A18 CPU LED Sequence Table

Sequence DS1 DS2 DS3 DS4 DS5 DS6 DS7 DS8

1 XXXXXXXX

2 00X00000

3 XXX00000

4 0XXXXXXX

5 00000000

6 XXXXXXX0

No Instrument Control From the Front Panel

Refer to “Front–Panel Display Assembly Troubleshooting” on page 30.

X = LED is on; 0 = LED is off

Error Messages

If error messages are reported after the turn–on check is completed, refer to
the Error Messages list, located on the E8257D/67D PSG Signal Generator
Documentation Set CD (part number E8251–90351) for details.

CPU Data Backup

This procedure applies only if the CPU is working prior to removal.

1. Record the installed license keys:

a. Press Utility > Instrument Adjustments > Instrument Options >

Software Options.

b. For each option that has a check mark after the license key, write

down the option number and the license key.

Take your time to be sure that you record each license key correctly.

2. Backup the calibration data from the CPU to the mother board:

— Execute the SCPI command: :DIAG:FILE:BACK.

3. Follow the instructions from Chapter 3, “Assembly Replacement.” to

replace the CPU board.

24 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Self–Test Failures and Related Troubleshooting

Self–Test Failures and Related Troubleshooting

Self–test results are valid only when all external cables and connectors are
removed from the PSG.

Table 1-4 Self–test Failures and Related Troubleshooting

If this self–test fails... Go to this troubleshooting section...

A13 I/Q Multiplexer “Self–Tests 1xx for the A13 I/Q Multiplexer” on page 55

100 Power Supply

101 CAL Source

102 Ext In Offset DAC and Switch

103 Path 1 & 2 and Ext Out

104 Path 1: Attenuators and Summing Amp

105 Path 2: Attenuators and Summing Amp

106 DC–Couple Mode, CW bias DAC,
Course+Fine DAC

107 Drift Canceller

108 IQ Polarity Switch

109 RMS to DC Converter

110 (not used)

111 Wideband Path Test

A5 Sampler “Self–Tests 2xx: A5 Sampler Self–Test Errors” on page 58

200 Power Supply

201 Tuning + Bias Test

202 Coarse Loop Detector

203 YO Loop Detector

A7 Reference (Std.) “Self–Tests 3xx: A7 Reference (Standard) Self–Test Errors (For

instruments with serial prefixes < US4805/MY4805)” on page 60

300 1 GHz Detector

301 Tuning Voltage

A8 Output “Self–Tests 4xx: A8 Output Self–Test Errors (E8267D only)” on

page 61

400 Ground and PTAT Test

401 Prelevel Loop Test

402 Quadrature DAC Test

403 VBLO Test

404 Marble Test

405 Gain Adjustment Test

406 Prelevel Bypass Test

407 Switched Filters Test

408 (not used)

409 ALC Modulation Test

E8257D/67D, E8663D PSG Signal Generators Service Guide 25

Troubleshooting
Self–Test Failures and Related Troubleshooting

Table 1-4 Self–test Failures and Related Troubleshooting (Continued)

If this self–test fails... Go to this troubleshooting section...

410 Burst Modulation Test

411 (not used)

412 HET Band Test

A9 YIG Driver “Self–Tests 6xx: A9 YIG Driver Self–Test Errors” on page 64

600 Post Regulator

601 DACs

602 PLL Interface

603 FM Driver

604 Sweep DACs

605 Sweep Lock

A6 Frac–N “Self–Tests 7xx: A6 Frac–N Self–Test Errors” on page 67

700 Ref Voltage

701 Loop Gain

702 Tuning Voltage

703 Output Voltage

704 Filter Test

705 F/2 Test

706 FM Path Test

707 Sweep Phase Detector Test

A45 Frac-N “Self–Tests 7xx: A45 Frac–N Self–Test Errors (option UNY)” on

page 70

720 Ref Voltage

721 1 GHz Input

722 Open Loop VCO

723 Open Loop F/2

724 Close Loop VCO

725 Low Band Filter

A10 ALC “Self–Tests 9xx: A10 ALC Self–Test Errors” on page 71

900 Power Supply

901 Detector Test

902 Detector Level to ALC Ref

903 Level Test

904 Scalar Pulse Test

905 ALC Mod

906 Scan Mod Test

A7 Reference (Option UNR/UNX) “Sel f–Tests 10xx: A7 Reference (Option UNR/UNX and Instruments

with Serial Prefixes ≥ US4805/MY4805) Self–Test Errors” on
page 74

1000 Power Supply

1001 10 MHz Test

1002 1 GHz Test

26 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Self–Test Failures and Related Troubleshooting

Table 1-4 Self–test Failures and Related Troubleshooting (Continued)

If this self–test fails... Go to this troubleshooting section...

A18 CPU “Self–Tests 11xx: A18 CPU Self–Test Errors” on page 76

1100 Power Supply

A26 Micro Interface Deck (E8257D) “Self–Tests 12xx: A26 MID Self–Test Errors (E8257D)” on page 77

1200 Power Supply

1201 Mod Filter

1202 20 GHz Doubler

1203 40 GHz Doubler (Option 540 only)

1204 RF Path

1205 LB Pulse Mod

1208 Quadraplier (Options 550 & 567)

A26 Micro Interface Deck (E8267D) “Self–Tests 12xx: A26 MID Self–Test Errors (E8267D)” on page 83

1200 Power Supply

1201 Mod Filter

1202 20 GHz Doubler

1203 40 GHz Doubler (Options 532 & 544)

1204 RF Path

1205 LB Pulse Mod

1206 20 GHz IQ Modulator

1207 Upconverter (Options 532 & 544)

1208 (not used)

1209 Downconverter Test

A11 Pulse/Analog Modulation Generator “Self–Tests 13xx: A11 Analog/Pulse Modulation Generator

Self–Test Errors” on page 89

1300 Power Supply

1301 Internal Pulse Generator Clock

1302 Output

1303 Voltage Ref DAC

1304 20 GHz Pulse

1305 44 GHz Upconverter Pulse

1306 Standard 3 GHz Pulse

1307 High Performance 3 GHz Pulse

1308 Numeric Synthesizer

1309 Function Generator Channel 1

1310 Function Generator Channel 2

1311 Frequency Modulation

1312 Low Frequency Out

1313 Amplitude Modulation

1314 External 1

1315 External 2

1316 AM Path Loss

E8257D/67D, E8663D PSG Signal Generators Service Guide 27

Troubleshooting
Self–Test Failures and Related Troubleshooting

Table 1-4 Self–test Failures and Related Troubleshooting (Continued)

If this self–test fails... Go to this troubleshooting section...

A14 Baseband Generator “Self–Tests 16xx for the A14 Baseband Generator (Option

601/602)” on page 92

1600 Host <–> BBG Comm

1601 Apps 1 <–> Apps 2 Comm

1602 Apps 1 <–> SH4 Comm

1603 Apps 2 <–> SH4 Comm

1604 FLiegan <–> Apps 2 Comm

1605 SRAM Test

1606 SDRAM Test

1607 Paren <–> SH4 Comm

1608 VCO Tune Test

1609 IQ DAC Output

1610 PLL Test

A8 Output “Self–Tests 22xx: A8 Output Self–Test Errors” on page 95

2200 Ground and PTAT Test

2201 Prelevel Loop Test

2202 Switched Filters Test

2203 ALC Mod System Test

2204 Pulse Mod System Test

2205 RF Path Test

2206 Het Band Test

A38 Lowband Filter “Self–Tests 24xx: A38 Lowband Filter Self–Test Errors” on page 97

2400 Power Supply Test

2401 RF Path Test

2402 Lowband Amp/Filter Power Supply

2403 RF Path

A43 Lowband Amp “Self–Tests 25xx: A43 Amp Filter Self–Test Errors” on page 98

2500 lowband Amp/Filter Power Supply

2501 RF Amp Test

2502 Filter Path Test

2503 Pulse Modulator Test

2504 Step Attenuator Test

2505 Divider On/Off Test

A8 Output “Self–Tests 26xx: A8 Output Self–Test Errors” on page 100

2600 Power Supply Tests

2601 Prelevel Loop Test

2602 ALC Modulator Test

2603 Pulse Modulator Test

2604 Clamp Detector Test

2605 Bias Switch Test

28 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Self–Test Failures and Related Troubleshooting

Table 1-4 Self–test Failures and Related Troubleshooting (Continued)

If this self–test fails... Go to this troubleshooting section...

2606 Switched Filters Test

2607 DAC Functionality Test

2608 Het Band Test

A46 Offset Loop “Self–Tests 27xx: A46 Offset Loop Self-Test Errors (Option UNY)” on

page 102

2701 Offset VCO

2702 Fstep at OSL

2703 Offset Loop Detector

2704 Fcomb at YOL

2705 YO Loop Detector

A8 Output “Self–Tests 28xx: A8 Vector Output Self-Test Errors” on page 102

2800 Power Supply Tests

2801 Prelevel Loop Test

2802 ALC Modulator Test

2803 Pulse Modulator Test

2804 Clamp Detector Test

2805 Bias Switch Test

2806 Switched Filters Test

2807 DAC Functionality Test

E8257D/67D, E8663D PSG Signal Generators Service Guide 29

Troubleshooting
Troubleshooting Assembly–Level Problems

Troubleshooting Assembly–Level Problems

This section provides the following:

— “Front–Panel Display Assembly Troubleshooting” on page 30

— “Power Supply Troubleshooting” on page 37

— “Option 008/009 Troubleshooting” on page 54

— “Self–Tests 1xx for the A13 I/Q Multiplexer” on page 55

— “Self–Tests 2xx: A5 Sampler Self–Test Errors” on page 58

— “Self–Tests 3xx: A7 Reference (Standard) Self–Test Errors (For

instruments with serial prefixes < US4805/MY4805)” on page 60

— “Self–Tests 4xx: A8 Output Self–Test Errors (E8267D only)” on page 61

— “Self–Tests 6xx: A9 YIG Driver Self–Test Errors” on page 64

— “Self–Tests 7xx: A6 Frac–N Self–Test Errors” on page 67

— “Self–Tests 9xx: A10 ALC Self–Test Errors” on page 71

— “Self–Tests 10xx: A7 Reference (Option UNR/UNX and Instruments with

Serial Prefixes ≥ US4805/MY4805) Self–Test Errors” on page 74

— “Self–Tests 11xx: A18 CPU Self–Test Errors” on page 76

— “Self–Tests 12xx: A26 MID Self–Test Errors (E8257D)” on page 77

— “Self–Tests 12xx: A26 MID Self–Test Errors (E8267D)” on page 83

— “Self–Tests 13xx: A11 Analog/Pulse Modulation Generator Self–Test

Errors” on page 89

— “Self–Tests 16xx for the A14 Baseband Generator (Option 601/602)” on

page 92

— “Self–Tests 22xx: A8 Output Self–Test Errors” on page 95

— “Self–Tests 24xx: A38 Lowband Filter Self–Test Errors” on page 97

— “Self–Tests 25xx: A43 Amp Filter Self–Test Errors” on page 98

— “Self–Tests 26xx: A8 Output Self–Test Errors” on page 100

Front–Panel Display Assembly Troubleshooting

Overview

The Front–Panel Display Assembly comprises the following:

— a 640 x 320 pixels liquid crystal display (LCD)

— a power switch/flat panel interface board, which contains the power on/off

switch, standby LED, and power–on LED

30 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

This board contains the circuitry to disable the power supply. The ON_OFF
control line is pulled to a TTL low to disable the power supply.

Another function of the power switch/flat panel interface board is to route
the 8 data bits from the A18 CPU to the A2 Display.

— a front panel board that contains the front–panel hardkeys, softkeys, and

RPG

— a dc to ac inverter, which turns the LCD on and off via control lines received

from the CPU

The inverter also converts the 5.2 Vdc to approximately a 160 Vrms, 40 kHz
signal to drive the LCD.

Display Controls

Contrast

There are two contrast hardkeys below the A2 Display. The left up arrow key
increases the contrast while the right down arrow key decreases the contrast.

Brightness

The A2 Display brightness can be adjusted from 50 (high brightness) to 1 (low
brightness) using the RPG, arrow keys, or the numeric keypad.

Other display features located under the Utility > Display softkey, include a
screen saver and inverse video.

Display Tests

The following two screen tests are available for the LCD:

— the Black Pixel Screen Test turns the display dark

— the White Pixel Screen Test turns the display bright

Softkey Location: Utility > Display > More (1 of 2)

To exit the test, press any front panel key.

Symptom: Dark display

1. Ensure that the front panel green power on LED is on. If not, refer to

“Power Supply Troubleshooting” on page 37.

2. Press any front panel key to disable the screen saver.

3. If the display is still bad, check P12 on the A31 Motherboard for the

following signals:

Signal State

P12−15.2 Vdc

P12−3 LIGHT_EN >3 Vdc

E8257D/67D, E8663D PSG Signal Generators Service Guide 31

Troubleshooting
Troubleshooting Assembly–Level Problems

Signal State

P12−4 VDISP Brightness = 50, VDSP < 50 mV

Brightness = 1, VDSP = 3 Vdc

— If the 5.2 Vdc line is bad, refer to “Power Supply Troubleshooting”

on page 37.

— If either the LIGHT_EN or VDISP are bad, check them at P221−16

and P221−55 respectively on the A31 Motherboard. If either signal
is bad at P221, replace the A18 CPU.

— If all the above signals are good, check the output of the dc to ac

inverter as follows:

a. Remove the front panel from the frame, and lay the front

panel face down.

b. With CN2−1 open, there is typically a 160 Vrms 40 kHz

signal. If not, replace the dc to ac inverter.

If the signal is there, replace the LCD.

Symptom: Bright display without characters

1. Ensure that the front–panel green power on LED is on. If not, refer to

“Power Supply Troubleshooting” on page 37.

2. Try adjusting the contrast controls.

3. Check the connection of the ribbon cable at J9 of the power switch/flat

panel interface board.

4. If the display is still too bright, use an oscilloscope to check P11 of the A31
Motherboard for the following signals:

Signal State

P11−4 VLCD

P11−6 LCD_ENABLE_H >3 Vdc

P11−9, 10, 12, 13, 15, 16, 18, 19, 21, 22, 24, 25, 27, 28, 30, 31, 33,
34, 36, 37, 39, 40

a. If >21V check the power supplies. If the power supplies are good, replace the mother-

board.

approximately 19.5 to 21 Vdc

Refer to Figure 1-1.

a

32 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting

500 ns

Troubleshooting Assembly–Level Problems

The pulse state signals are control lines, clock, and data for the LCD.

Figure 1-1 Pulsing Activity

5. If all the signals measured in Step 4 are good, go to Step 6.

If any of the signals measured in Step 4 are bad, check the following
signals at P221 of the motherboard:

Signal State

P221−14 VLCD approximately 21 Vdc

P221−53 LCD_ENABLE_H >3 Vdc

P221–1 to 13, 15, 41, 43, 45, 47, 49 to 52 Refer to Figure 1-1 on page 33.

If any of these signals are bad, change the CPU board.

6. If all the signals measured in Step 4 are good, check the following signals
at J9 of the power switch. To access J9 the front panel must be removed
from the chassis frame and laid face down.

Signal State

J9−7 VLCD approximately 21 Vdc

E8257D/67D, E8663D PSG Signal Generators Service Guide 33

Troubleshooting
Troubleshooting Assembly–Level Problems

Signal State

J9−4 LCD_ENABLE_H >3 Vdc

J9−5 5.2 Vdc

J9−1, 2, 3, 8 to 15 Refer Figure 1-1 on page 33.

If these signals are good, replace the LCD.

If these signals are not good, replace the power switch/flat panel interface
board.

Symptom: Hardkeys or softkeys do not work

The A1 Keyboard contains the hardkeys and softkeys switches. The keys are
arranged in a matrix (shown below) with the control lines KEYCOLx and
KEYROWx on the x and y axis. When you press a hardkey or softkey, one cell of
the matrix is activated; the normally TTL low KEYROWx of the active cell pulses
high, and the normally TTL high KEYCOLx of the active cell pulses low.

KEYCOL0 KEYCOL1 KEYCOL2 KEYCOL3 KEYCOL4 KEYCOL5 KEYCOL6 KEYCOL7

KEYROW0 softkey 3 N/A Cont Up N/A LF Out N/A I/Q Pulse
KEYROW1 softkey 2 Incr/Set Cont Down Ampl Ampl Menu Mode Setup Aux Fctn FM/ϕΜ
KEYROW2 softkey 1 Up N/A Freq Sweep List Mode Mux AM
KEYROW3 softkey 4 N/A N/A Right Arrow Help Save Recall Trigger
KEYROW4 softkey 6 N/A Local Hold Mod On/Off 4 5 6
KEYROW5 softkey 5 N/A Return Down Arrow N/A 7 8 9
KEYROW6 N/A N/A N/A Left Arrow RF On/Off 0 . +/-
KEYROW7 softkey 7 N/A Preset N/A N/A 1 2 3

1. Ensure that the front panel green power on LED is on. If it is not on, refer to

“Power Supply Troubleshooting” on page 37.

2. To ensure the signal generator is not being controlled remotely, press the
Local hardkey.

3. Use an oscilloscope to monitor the KEYCOLx and KEYROWx pins of the key

that is not working at P13 on the motherboard. Use the following table to
identify the appropriate pin number:

KEYCOL pins should be a TTL high KEYROW pins should be a TTL low
KEYCOL0 P13–1 KEYROW0 P13–17
KEYCOL1 P13–3 KEYROW1 P13–19
KEYCOL2 P13–5 KEYROW2 P13–21
KEYCOL3 P13–7 KEYROW3 P13–23
KEYCOL4 P13–9 KEYROW4 P13–25
KEYCOL5 P13–11 KEYROW5 P13–26
KEYCOL6 P13–13 KEYROW6 P13–24
KEYCOL7 P13–15 KEYROW7 P13–22

34 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

4. If either signal is incorrect, use the following table and check the signal at
P221, as it leaves the CPU board. If the signal is bad at P221, replace the
A18 CPU.

KEYCOL pins should be a TTL high KEYROW pins should be a TTL low
KEYCOL0 P13–1 KEYROW0 P13–17
KEYCOL1 P13–3 KEYROW1 P13–19
KEYCOL2 P13–5 KEYROW2 P13–21
KEYCOL3 P13–7 KEYROW3 P13–23
KEYCOL4 P13–9 KEYROW4 P13–25
KEYCOL5 P13–11 KEYROW5 P13–26
KEYCOL6 P13–13 KEYROW6 P13–24
KEYCOL7 P13–15 KEYROW7 P13–22

5. If both signals are correct, press the faulty hardkey or softkey while
monitoring the KEYCOL or KEYROW on the oscilloscope. The KEYCOL line
should pulse low; the KEYROW line should pulse high.

If either line does not function properly, replace the front panel board.

E8257D/67D, E8663D PSG Signal Generators Service Guide 35

Troubleshooting
Troubleshooting Assembly–Level Problems

Symptom: RPG not working properly

1. Ensure that the front panel green power on LED is on. If it is not on, refer to

“Power Supply Troubleshooting” on page 37.

2. Check the front panel operation by checking random hardkey operation.

3. Check P13–12 for +5.2 Vdc. If the voltage is not present, refer to “Power

Supply Troubleshooting” on page 37 for troubleshooting.

4. Press the Frequency hardkey on the front panel.

5. Using an oscilloscope, monitor P13–14 and P13–10 while rotating the RPG

knob. The LCD frequency value should change, and both signals at P13
should pulse to a TTL high. If either signal does not pulse, replace the
A1 Keyboard.

6. If the signals pulse at P13, check the signal at P221 pins 57 and 17 of the
motherboard. If the signals pulse at P221, replace the CPU board.

Symptom: Screen saver not working properly

The screen saver delay can be set for any integer from 1 to 12 hours. The CPU
board controls the screen saver by pulling the LIGHT_EN line low.

1. If the delay time elapses and the display does not go dark, check the
LIGHT_EN signal at P12–3.

— If the signal is a TTL low, replace the dc to ac inverter.

2. If the signal is a TTL high, check it at P221–16 of the motherboard.

— If the signal is high at P221, replace the CPU board.

36 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

Power Supply Troubleshooting

The power supply is a switching supply with automatic line–voltage and
frequency selection. Because of this, a switch is not required to set 115 VAC or
240 VAC operation. The input power line is fused, but the fuse is not
replaceable; if the fuse opens, you must replace the power supply.

For the E8267D, if the red PS–FAULT LED is off (see Figure 1-5), troubleshoot the
power supply.

After unplugging the instrument, wait 30 seconds to allow the supplies to
discharge before removing or installing an assembly.

Tables 1-5 through 1-7 list the motherboard test points (connector and pin
number) and power supply voltages for the E8257D. See Figure 1-2 on

page 46 for connector locations.

Tables 1-8 through 1-12 list the motherboard test points (connector and pin
number) and power supply voltages for the E8267D, beginning on page 1-41.
See Figure 1-3 on page 47 for connector locations.

Table 1-5 E8257D/E8663D Power Supply vs. Assembly Matrix (1 of 3)

Motherboard test points: +32 Vdc +15 Vdc +10 Vdc +8 Vdc +9 Vdc +5.2 Vdc

A1 Keyboard P13–12

A2 Display P11–44

A3 Power Supply P231–1, 41P231–3, 4,

43, 44

A5 Sampler P22–7 P22–6, 21 P22–20, 5 P22–14, 29

A6 Frac–N P32–7 P32–6, 21 P32–20, 5 P32–14, 29

A7 Reference P42–7 P42–6, 21 P42–20, 5 P42–14, 29

A8 Output P52–7 P52–6, 21 P52–20, 5 P52–14, 29

A9 YIG Driver P112–6 P112–5, 30 P112–15, 16, 40 P112–17, 18, 42 P112–3, 28

A10 ALC P122–4 P122–28 P122–2, 27

A11 Mod Gen P132–4 P132–28 P132–2, 27

A12 Pulse Modulator J14–10 J14–9

A18 CPU P223–4 P223–23 P223–39 P223–40 P223–18 P223–2, 22

A21 Rear Panel P241–13, 14P241–17, 18 P241–11, 12

P231–6, 7, 46, 47 P231–15, 16, 18,

19, 55, 56, 58, 59

A26 Microwave Interface P201–1 P201–2, 3, 4P201–5, 6, 7, 8, 9, 10P201–29 P201–13, 14, 15,

16, 17, 18

A23 Lowband Coupler/Detector J15–8

E8257D/67D, E8663D PSG Signal Generators Service Guide 37

Troubleshooting
Troubleshooting Assembly–Level Problems

Table 1-5 E8257D/E8663D Power Supply vs. Assembly Matrix (1 of 3)

Motherboard test points: +32 Vdc +15 Vdc +10 Vdc +8 Vdc +9 Vdc +5.2 Vdc

A27 40 GHz Doubler
(E8257D only)

A29 20 GHz Doubler J32–5 J32–19 J32–21 J32–7, 9

A30 Mod Filter J31–5 J31–19 J31–21 J31–7, 9

A36 Quadraplier (E8257D only) J34–2 J34–5, 6, 7

AT1 Attenuator J13–1

A38 Low Band Switch Filter P142–4 P142–20 P142–2, 27

J33–5 J33–19 J33–21 J33–7, 9

Table 1-6 E8257D/E8663D Power Supply vs. Assembly Matrix (2 of 3)

Motherboard test points: +5.2 Digital +3.4 Digital +2.6 Vdc –7 Vdc –6 Vdc +1.8 Vdc

A2 Display P11–44

A2DS1 Backlight P12–1

A3 Power Supply P231–21, 22,

25, 61, 62, 65,

A5 Sampler P22–3, 18

A6 Frac–N P32–3, 18

P231–28, 29,
32, 35, 36, 68,
69, 72, 75, 76

P231–9, 10,
49, 50

A7 Reference P42–3, 18

A8 Output P52–3, 18

A9 YIG Driver P111–64, 65,

129, 130

A10 ALC P121–64, 65,

129, 130

A11 Mod Gen P131–64, 65,

129, 130

A18 CPU P222–49, 50, 99,

100

A26 Microwave Interface P201–23 P201–24 P201–30,

A36 Quadraplier (E8257D only) J34–24

A38 Low Band Switch Filter P141–64, 65,

129, 130

P111–60, 61,
62, 63, 125,
126, 127, 128

P121–60, 61,
62, 63, 125,
126, 127, 128

P131–60, 61,
62, 63, 125,
126, 127, 128

P222–45, 46,
47, 48, 95, 96,
97, 98

P141–60, 61,
62, 63, 125,
126, 127, 128

P11–57, 58, 59,
123, 124

P121–57, 58,
59, 123, 124

P131–57, 58,
59, 123, 124

P141–57, 58,
59, 123, 124

P112–11,
12, 13, 14,
38

P223–37 P223–17

33, 46

P112–19, 44

P141–57,
55, 56, 117,
120, 121

38 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

Table 1-6 E8257D/E8663D Power Supply vs. Assembly Matrix (2 of 3) (Continued)

Motherboard test points: +5.2 Digital +3.4 Digital +2.6 Vdc –7 Vdc –6 Vdc +1.8 Vdc

AT1 Attenuator J13–2

Table 1-7 E8257D/E8663D Power Supply vs. Assembly Matrix (3 of 3)

Motherboard
test points:

A2 Display P11–43

A3 Power Supply P231–12,

A5 Sampler P22–2, 17 P22–4,

A6 Frac–N P32–2, 17 P32–4,

A7 Reference P42–2, 17 P42–4,

A8 Output P52–2, 17 P52–4,

A9 YIG Driver P112–4, 29P112–1,

A10 ALC P122–3 P122–1,

A11 Mod Gen P132–3 P132–1,

–15 Vdc –5.2 Vdc –3 Vdc +3.5 Vdc

13, 52, 53

19

19

19

19

2, 26, 27

26

26

+6.5 Vdc +12 Vdc +15 Vdc stby

P231–80

Fan
Voltage

A12 Pulse Modulator J14–7 P201–31,

32

A18 CPU P223–3 P223–1 P223–21

A21 Rear Panel P241–15, 16P241–9,

10

A23 Lowband
Coupler/Detector

A26 Microwave Interface P201–11,

A27 40 GHz Doubler
(E8257D only)

A29 20 GHz Doubler J32–4 J32–8 J32–1, 3

A30 Mod Filter J31–4 J31–8 J31–1, 3

A36 Quadraplier
(E8257D only)

J15–10

P201–31,

12

J33–4 J33–8

J34–3 J34–17 J34–11, 12,

32

13, 14, 15

J34–8, 9

P241–5, 6, 7,
8

E8257D/67D, E8663D PSG Signal Generators Service Guide 39

Troubleshooting
Troubleshooting Assembly–Level Problems

Table 1-7 E8257D/E8663D Power Supply vs. Assembly Matrix (3 of 3) (Continued)

Motherboard
test points:

A38 Low Band Switch
Filter

B1 Fan Fan+ P252–2

–15 Vdc –5.2 Vdc –3 Vdc +3.5 Vdc

P142–3 P142–26

+6.5 Vdc +12 Vdc +15 Vdc stby

Fan
Voltage

P252–2
Fan– P252–1
P252–1

40 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

Table 1-8 E8267D Power Supply vs. Assembly Matrix (1 of 5)

LED

Motherboard Test Points:

+32 VDC –24 VREF

A3 Power Supply J231–A4–6 J231–B1–3,

LED
+15 VDC +15 VAF

D1–3

LED
+10 VDC

J233–B1–3,
D1–3

LED
+8 VDC

J232–A4–6

A6 Frac N P32–7 P32–6, 21

A7 Reference P42–7 P42–6, 21

A8 Lowband Output P52–7 P52–6, 21

A9 YIG Driver P112–6 P112–5, 30 P112–15, 16, 40

A10 ALC P122–4 P122–28

A11 Mod Gen P132–4 P132–28

A13 I/Q Multiplexer P152–4 P152–28

A14 Baseband Generator P162–4 P162–28

A18 CPU P223–4 P223–23 P223–39 P223–40

A21 Rear Panel P241–13, 14 P241–17, 18

A23 Lowband Coupler/Det J15–8

A26 Microwave Interface

P201–1 1 P201–2, 3, 4

P201–5, 6, 7, 8,
9, 10

P201–29

a

A27 40 GHz Doubler J36–5 J36–19 J36–21

A29 20 GHz Doubler J32–5 J32–19 J32–21

A30 20 GHz Mod Filter J31–5 J31–19 J31–21

A35 20 GHz I/Q Modulator

J34–8

a

J34–3

a

A37 45 GHz Upconverter J35–10

A38 Low Band Switch Filter P142–4 P142–20

AT1 Attenuator J13–1

a. Originates on microwave interface.

Table 1-9 E8267D Power Supply vs. Assembly Matrix (2 of 5)

LED

Motherboard Test Points: +8 VA

+9 VDC

A1 Keyboard P1–12

A2 Display P11–44

A2DS1 Backlight P12–1

LED
+5.2 VDC

+5.2 VAF

LED
+5.2D

+5.2 VDF

E8257D/67D, E8663D PSG Signal Generators Service Guide 41

Troubleshooting
Troubleshooting Assembly–Level Problems

Table 1-9 E8267D Power Supply vs. Assembly Matrix (2 of 5)

LED

Motherboard Test Points: +8 VA

A3 Power Supply J232–B1–3, C4–6,

A5 Sampler P22–20, 5 P22–14, 29

A6 Frac N P32–20, 5 P32–14, 29

A7 Reference P42–20, 5 P42–14, 29

A8 Lowband Output P52–20, 5 P52–14, 29

A9 YIG Driver P112–17, 18,

A10 ALC P122–2, 27 P122–64, 65, 129,

A11 Mod Gen P132–2, 27 P132–64, 65, 129,

A13 I/Q Multiplexer P152–2, 27 P151–64, 65, 129,

A14 Baseband Generator P162–2, 27 P161–64, 65, 129,

+9 VDC

a

42

LED
+5.2 VDC

D1–3

P112–3, 28 P111–64, 65, 129,

+5.2 VAF

LED
+5.2D

J236–B1–3, D1–3

130

130

130

130

130

+5.2 VDF

A18 CPU P223–18 P223–2, 22 P222–49, 50, 99,

100

A21 Rear Panel P241–11, 12

A23 Lowband Coupler/Det J15–12

A26 Microwave Interface P201–13, 14, 15,

16,
17, 18

A27 40 GHz Doubler J36–7, 9

A29 20 GHz Doubler J32–7, 9

A30 20 GHz Mod Filter J31–7, 9

A35 20 GHz I/Q Modulator J34–5,

A37 45 GHz Upconverter J35–7,

A38 Low Band Switch Filter P142–2, 27 P141–64, 65, 129,

AT1 Attenuator J13–2

b

6

8

J34–7

J35–1, 2, 3,
11

P201–23

b

130

a. Originates on YTO Driver
b. Originates on microwave interface

J34–28

J35–16

b

42 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

Table 1-10 E8267D Power Supply vs. Assembly Matrix (3 of 5)

LED

Motherboard Test Points:

A2DS1 Backlight P12–1

A3 Power Supply J236–A4–6,

A5 Sampler P22–3, 18 P22–2

A6 Frac N P32–3, 18 P32–2

A7 Reference P42–3, 18 P42–2

A8 Lowband Output P52–3, 18 P52–2

A9 YIG Driver P111–60, 61, 62,

A10 ALC P122–60, 61, 62,

A11 Mod Gen P132–60, 61, 62,

+3.4D

C4–6, E4–6

J237–A4–6,
B1–3,
C4–6, D1–3

63, 125, 126,
127, 128

63, 125, 126,
127, 128

63, 125, 126,
127, 128

LED
+2.6VD

J238–A4–6,
B1–3, E4–6

J239–A4–6,
B1–3

P112–57, 58,
59, 123, 124

P122–57, 58,
59, 123, 124

P132–57, 58,
5,
123,124

LED
–7 VDC

J233–A4–6, C4–6,
E4–6

P112–11, 12, 13,
14, 38

LED
–6 VDC

P112–19,

a

44

LED
–15 VDC

J231–C4–6
,
E4–6

P112–4, 29

P122–3

P132–3

–15 VAF

A13 I/Q Multiplexer P151–60, 61, 62,

63, 125, 126,
127, 128

A14 Baseband Generator P161–60, 61, 62,

63, 125, 126,
127, 128

A18CPU P222–45, 46, 47,

48, 95, 96, 97,
98

A21 Rear Panel P241–15,

A23 Lowband Coupler/Det J15–10

A26 Microwave Interface P201–24 P201–30, 33, 46 P201–11,

A27 40 GHz Doubler J36–4

A29 20 GHz Doubler J32–4

A30 20 GHz Mod Filter J31–4

A35 20 GHz I/Q Modulator

P151–57, 58,
59, 123, 124

P161–57, 58,
59, 123, 124

P152–3

P162–3

P223–37 P223–17 P223–3

16

12

J34–4

b

E8257D/67D, E8663D PSG Signal Generators Service Guide 43

Troubleshooting
Troubleshooting Assembly–Level Problems

Table 1-10 E8267D Power Supply vs. Assembly Matrix (3 of 5)

Motherboard Test Points:

LED
+3.4D

LED
+2.6VD

LED
–7 VDC

A37 45 GHz Upconverter J35–11

A38 Low Band Switch Filter P141–60, 61, 62,

63, 125, 126,

P141–57, 58,
59, 123, 124

127, 128

a. Originates on YTO driver
b. Originates on Microwave Interface

Table 1-11 E8267D Power Supply vs. Assembly Matrix (4 of 5)

LED

Motherboard Test Points:

–5.2V

A2 Display P11–43

A3 Power Supply J235–E4, 5

A5 Sampler P22–4, 19

A6 Frac N P32–4, 19

A7 Reference P42–4, 19

A8 Lowband Output P52–4, 19

LED
–5.2 V2

a

+1.8 VDC

+12 VDC

LED
–6 VDC

LED
–15 VDC

P142–3

LED
+15 VSTBY

–15 VAF

Fan Voltage

A9 YIG Driver

P112–1, 2,

b

26, 27

A10 ALC P122–1, 26

A11 Mod Gen P132–1, 26

A13 I/Q Multiplexer P152–1 P152–26

A14 Baseband Generator P162–1 P162–26

A18 CPU P223–1 P223–21

A21 Rear Panel P241–9, 10 P241–5, 6, 7, 8

A26 Microwave Interface P201–31, 32

A27 40 GHz Doubler J36–8

A29 20 GHz Doubler

A30 20 GHz Mod Filter

A35 20 GHz I/Q Modulator

A38 LB Switch Filter

J32–8

J31–8

P142–26 P141–51, 55,

J32–1, 3

J31–1, 3

c

J34–9

c

c

56, 117, 120,
121

44 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

Table 1-11 E8267D Power Supply vs. Assembly Matrix (4 of 5)

Motherboard Test Points:

LED
–5.2V

LED
–5.2 V2

a

+1.8 VDC

+12 VDC

+15 VSTBY

Fan Voltage

LED

B1 Fan Fan+

P252–2,
P251–2

Fan–
P252–1,
P251–1

a. Voltage regulator on motherboard
b. Originates on YTO Driver
c. Originates on Microwave Interface

Table 1-12 E8267D Power Supply vs. Assembly Matrix (5 of 5)

LED

Motherboard Test Points:

+1.95VD1

Baseband Generator P161–52, 118 P161–55, 56, 120–122

a

LED

+1.8VD_1

a

a. Voltage regulator on motherboard

E8257D/67D, E8663D PSG Signal Generators Service Guide 45

Troubleshooting

P221

P222

P191

P181

P171

P151

P141

P131

P121

P111

P241

P231P223

P192

P182

P172

P152

P142

P132

P122

P112

P53

P43

P33

P23

P11

P13

J1122

J1121

J1051

P52

P42

P32

P22

P51

P31

P21

P41

J1055

J1042

J1031

J1032

J1021

J1041

J1043

P201

Troubleshooting Assembly–Level Problems

Figure 1-2 E8257D (Analog) Motherboard Connectors – Bottom View

46 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting

P222

J231–J234

P241

J235–J239

P201 P221

P223

P172

P162

P152

P142

P132

P122

P112

P192

P53

P43

P33

P23

P13

P12

P31

P21

P41P51

P52

P42 P32

P22

P11

P191

P171

P161

P151

P141

P131

P121

P111

J1043

J1021

J1031

J1032

J1041

J1042

J1056

J1055

J1057

J1052

J1053

J1122

J1121

J1051

J501

J502

J500

Troubleshooting Assembly–Level Problems

Figure 1-3 E8267D (Vector) Motherboard Connectors – Bottom View

E8257D/67D, E8663D PSG Signal Generators Service Guide 47

Troubleshooting
Troubleshooting Assembly–Level Problems

Symptom: amber standby LED not working properly

With the instrument plugged in and the power turned off, the front panel
amber standby LED should be on, as well as the green +15 Standby LED on the
motherboard. This is controlled by the +15 Standby line supplied by the power
supply, which is routed via the motherboard to the front panel.

To troubleshoot, turn the instrument off and follow the signal path.

Symptom: front panel green LED not working properly

When the front panel power switch is turned on, the amber LED should go out
and the green LED should come on. Also, the fan should start rotating and the
front panel display should illuminate.

Troubleshooting:

— Verify the supply voltages at P11 of the A31 Motherboard.

— If the supply voltages are correct, replace the Power Switch/Flat Panel

Interface Board.

Symptom: fan not working

The fan is connected to the motherboard, and is audible when the instrument
is on. The fan voltage is +14V.

To troubleshoot, verify that all supplies are working; disconnect the fan from
the rear panel assembly at P6 and check the fan voltage at P6–2. If the fan
voltage is correct, replace the fan.

Symptom: Instrument does not power up; power supply LEDs not on

Checking Power Supplies

Each of the power supplies has an LED on the bottom of the motherboard (see

Figure 1-4 on page 50 and Figure 1-5 on page 51). When the power supply is

functioning, the green LED lights. Use a DVM to measure the supplies on the
motherboard, and ensure they meet the following power supply specifications.

Supply
Voltage

+32 32 ± 1.0 10 +5.2VDF 5.2 ± 0.15 10

+15 15 ± 0.5 10 +3.4 VD 3.4 ± 1.0 10

Acceptable
Voltage
(Vdc)

Maximum
Ripple
(mVpp)

Supply
Voltage

Acceptable
Voltage
(Vdc)

Maximum
Ripple
(mVpp)

+15
Standby

+10 10.2 ± 0.2 10 –6 –6 ± 0.12 10

+9 9 ± 0.18 10 –7 –7 ± 0.1 10

+8 8 ± 0.5 10 –15 –15 ± 0.5 10

48 E8257D/67D, E8663D PSG Signal Generators Service Guide

15 ± 0.75 20 –5.2 –5.2 ± 0.1 10

Troubleshooting
Troubleshooting Assembly–Level Problems

Supply
Voltage

+5.2 5.2 ± 0.15 10

Supply
Voltage

+32 32 ± 0.96 10 +1.95 VD_1 1.95 ± 0.06 10

+15 15 ± 0.45 10 +1.95 VD_2 1.95 ± 0.06 10

+15
Standby

+10 10 ± 0.3 10 +1.8 VD_2 1.8 ± 0.05 10

+9 9 ± 0.18 10 –5.2 –5.2 ± 0.1 10

+8 8 ± 0.5 10 –5.2 V2 –5.2 ± 0.16 10

+5.2 5.2 ± 0.16 10 –6.0 –6 ± 0.12 10

Acceptable
Voltage
(Vdc)

Acceptable
Voltage
(Vdc)

15 ± 0.45 20 +1.8 VD_1 1.8 ± 0.05 10

Maximum
Ripple
(mVpp)

Maximum
Ripple
(mVpp)

Supply
Voltage

Supply
Voltage

Acceptable
Voltage
(Vdc)

Acceptable
Voltage
(Vdc)

Maximum
Ripple
(mVpp)

Maximum
Ripple
(mVpp)

+5.2 D 5.2 ± 0.16 20 –7.0 –7.0 ± 0.21 10

+3.4 3.4 ± 0.1 10 –15 –15 ± 0.45 10

+2.6 D 2.6 ± 0.08 10

If a supply LED is not lit, or a measured voltage is less than the acceptable
value, an assembly may be loading down that supply. Using the appropriate

Power Supply vs. Assembly Matrix, determine where each supply is used, then

use the following steps to isolate the defective assembly.

Remove a minimum number of assemblies at one time. If the power supply does
not have a minimum load on it, the supply voltage increases to an overvoltage
condition.

1. Turn off the instrument and remove one of the assemblies biased by the
faulty supply.

2. Turn the instrument on and check the faulty supply. If the supply LED
lights, replace the assembly removed in Step 1. If not, continue with Step

3.

3. Turn the instrument off and reinstall the assembly removed in Step 1.
Remove the next assembly and see if the supply LED lights. Continue this
process until the supply functions properly.

4. Replace the last assembly that you removed.

E8257D/67D, E8663D PSG Signal Generators Service Guide 49

Troubleshooting

DS101

DS103

DS104

DS112

DS113

DS102

DS109

DS100

DS110

DS111

DS106

DS105

+9V

+8V

–6V

–5.2V

+5.2VDF

+3.4VD

+15VSTBY

+32V +15V

+10V

–7V

–15V

+5.2V

DS107

Troubleshooting Assembly–Level Problems

Figure 1-4 E8257D Motherboard Power Supply LEDs

50 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting

–7V

DS112

+10V+5.2V

+15V

DS104

DS107

DS102

–15V

DS113

+15VSVSTBY

DS103

+32V

DS101

+8V

+9V

–5.2V

–6V

DS111

DS105

DS110

DS106

DS115

–5.2V2

+1.95VD1

DS118

+1.95VD2

DS119

+2.6VD

DS114

+3.4D

DS109

+5.2VD

DS108

DS116

+1.8VD1

+1.8VD2

DS117

PS–FAULT

Troubleshooting Assembly–Level Problems

Figure 1-5 E8267D Motherboard Power Supply LEDs

E8257D/67D, E8663D PSG Signal Generators Service Guide 51

Troubleshooting
Troubleshooting Assembly–Level Problems

Power Switch On/Off Line

If the control line (ON/OFF) from the A3 Power Switch located in the front panel
assembly goes to a TTL low state, or if the line impedance is less than
500 ohms, the power supply shuts down. This signal can be measured on the
A31 Motherboard at pin 79 of P241.

To troubleshoot:

1. Turn the front panel switch on and ensure that the +15 Standby is good.

2. Verify that the ON/OFF control line is > 3.5 Vdc.

The Power Switch/Flat–Panel Interface Board in the front panel assembly
controls this signal.

Symptom: Green front panel LED and power supply LEDs
on motherboard blinking

Overvoltage or Overcurrent

The individual supplies in the instrument are not fused, but an overvoltage or
overcurrent condition can shut them down. With either of these conditions, the
front panel green LED and the power supply LEDs blink at approximately 2 Hz.
The power supply tries to revive, but if the condition does not clear, the
instrument stays in this mode. In some cases, cycling power fixes the problem.

To troubleshoot, use the following steps to isolate the defective assembly:

Remove a minimum number of assemblies at one time. If the power supply does
not have a minimum load on it, the supply voltage increases to an overvoltage
condition.

Refer to the
help in determining which assembly uses which power supplies.

Power Supply vs. Assembly Matrix tables, starting on page 37, for

1. Turn off the instrument and remove one of the assemblies biased by the
faulty supply.

2. Turn the instrument on and check whether the overvoltage or overcurrent
condition still exists. If it does not, replace the assembly removed in Step

1. If it does, continue with Step 3.

3. Turn the instrument off and reinstall the assembly removed in Step 1.
Remove the next assembly and see if that fixes the problem. Continue this
process until the supply functions properly.

4. Replace the last assembly that you removed.

52 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

Symptom: Amber front panel LED blinking

Thermal shutdown

With thermal shutdown, the front panel green LED and the power supply LEDs
blink as long as the condition exists. There are two temperature sensing
devices in the instrument: one on the A8 Output, and one on the A19 Power
Supply.

To troubleshoot:

1. If the instrument is hot, ensure that the fan is working and let the
instrument cool off.

2. If the instrument still shuts down, remove the Output assembly.

3. If the instrument still shuts down, replace the Power Supply.

or

If the instrument powers on, but the amber LED continues to blink, replace
the A3 Power Switch assembly.

Symptom; +9, –6, or –5.2 V LEDs not on

These supplies are generated on the YIG Driver Assembly.

Troubleshoot using the Power Supply vs. Assembly Matrix that begins on

page 1-37.

1. At P112 of the Motherboard, ensure the YIG Driver Assembly is receiving
the +32, +15, +10, –7, –15 Vdc supplies.

2. If the supplies are present at P112, note in the matrix where each supply is
used.

3. Power down the instrument and remove one of the assemblies that is
biased by the faulty supply.

4. Power the instrument up again and check the faulty supply. If it is still bad,
power down and re–install the first assembly removed.

5. Remove the next assembly and see if that fixes the problem. Continue this
process until the supply functions properly.

6. Replace the last assembly that you removed.

Symptom: +1.95 VD, +1.8 VD LEDs not on

These supplies are generated by voltage regulators on the A31 Motherboard.

Troubleshoot by checking the following voltages at the A19 Power Supply:

— +3.4 VD, which is regulated down to +1.95 VD

— +2.6 VD, which is regulated down to +1.8 VD

If the supplies are good at the A19 Power Supply, replace the A31
Motherboard.

E8257D/67D, E8663D PSG Signal Generators Service Guide 53

Troubleshooting
Troubleshooting Assembly–Level Problems

Option 008/009 Troubleshooting

Removable flash memory operation requires a license key, a compact flash
drive, and a flash memory card. The flash drive communicates directly to the
A18 CPU through a ribbon cable.

A flash memory card must be installed for the firmware to report Option 008/009
in the instrument.

1. Verify the flash memory card is installed.

2. Power the instrument on.

3. Check to see if Option 008 or 009 is installed in the instrument, press
Utility > Instrument Info > Diagnostic.

4. Verify the green LED to the right of the A41 Compact Flash Door, on the

instrument rear panel, turns on and off during the instrument boot-up.

5. If the green LED light does not turn on and off or Option 008/009 is not
listed as an installed option,

a. Replace the flash memory card.

b. Repeat steps 2 thru 4.

6. If the green LED light still does not turn on and off or Option 008/009 is

still not listed as an installed option,

a. Replace the A40 Compact Flash Drive.

b. Repeat steps 2 thru 4.

7. If the green LED light still does not turn on and off or Option 008/009 is

still not listed as an installed option,

a. Replace the A18 CPU

b. Run the required performance test for the A18 CPU, see Chapter 4,

“Post–Repair Procedures.”

c. Repeat steps 2 thru 4.

54 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

Self–Tests 1xx for the A13 I/Q Multiplexer

Power Supply Voltage
(Vdc)

+15 P152 – 28 +14.55 +15.45 Main Supply

−15 P152 – 3 −15.45 −14.55 Main Supply

+5.2 P152 – 27 +5.04 +5.36 Main Supply

−5.2 P152 – 1 −5.36 −5.04 A9 YIG Driver

−5.2 V2 P152 – 26 −5.30 −5.10 A31

+5.2 D P151 – 64, 65, 129,

A31 Motherboard
Connector Pins

130

Minimum
(Vdc)

+5.04 +5.36 Main Supply

Maximum
(Vdc)

Origin

Motherboard

E8257D/67D, E8663D PSG Signal Generators Service Guide 55

Troubleshooting
Troubleshooting Assembly–Level Problems

100 Power Supply

— If all power supply voltages are good on the A31 Motherboard, replace the

A13 I/Q Multiplexer.

— If any of the supply voltages are bad on the A31 Motherboard, check the

origin of that supply.

— If the supply voltage is good at the origin, replace the A31

Motherboard.

— If the supply voltage is bad at the origin, troubleshoot the origin.

101 CAL Source

— Replace the A13 I/Q Multiplexer.

102 Ext In Offset DAC and Switch

— Replace the A13 I/Q Multiplexer

103 Path 1 & 2 and Ext Out

— Replace the A13 I/Q Multiplexer

104 Path 1: Attenuators and Summing Amp

— Replace the A13 I/Q Multiplexer

105 Path 2: Attenuators and Summing Amp

— Replace the A13 I/Q Multiplexer

106 DC–Couple Mode, CW bias DAC, Course+Fine DAC

— Replace the A13 I/Q Multiplexer

107 Drift Canceller

— Replace the A13 I/Q Multiplexer

108 IQ Polarity Switch

— Replace the A13 I/Q Multiplexer

109 RMS to DC Converter

— Replace the A13 I/Q Multiplexer.

110 Not Used

56 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

111 Wideband Path Test

Use an oscilloscope to check A13 I/Q Multiplexer output.

1. Disconnect the cable from A13J10.

2. Probe A13J10 while executing self test 111, for a square wave, 300 ms at

+0.7V and 300 ms at –0.7V.

— If a square wave is not present on A13J10, replace the A13 I/Q

Multiplexer board.

— If a square wave is present at A13J10, continue to step 3.

3. Reconnect the cable to A13J10.

4. Disconnect the cable from A31J1052.

5. Probe A31J1052 while executing self test 111, for a square wave on the

center pin, 300 ms at +0.7V and 300 ms at –0.7V.

— If a square wave is not present on A31J1052, replace the W132

cable.

— If a square wave is present at A31J1052, replace the A8 Output

board.

6. Disconnect the cable from A13J9.

7. Probe A13J9 while executing self test 111, for a square wave, 300 ms at

+0.7V and 300 ms at –0.7V.

— If a square wave is not present on A13J9, replace the A13 I/Q

Multiplexer board.

— If a square wave is present at A13J9, continue to step 3.

8. Disconnect the cable from A31J1053.

9. Probe A31J1053 while executing self test 111, for a square wave on the

center pin, 300 ms at +0.7V and 300 ms at –0.7V.

— If a square wave is not present on A31J1053, replace the W131

cable.

— If a square wave is present at A31J1053, replace the A8 Output

board.

E8257D/67D, E8663D PSG Signal Generators Service Guide 57

Troubleshooting
Troubleshooting Assembly–Level Problems

Self–Tests 2xx: A5 Sampler Self–Test Errors

Before proceeding to the reported self–test error code, check the following
voltages. If any voltages are out of specification, troubleshoot the supply
problem first.

Supply Voltage
(Vdc)

+32 P22–7 +31.04 +32.96 Main Supply

+15 P22–6, 21 +14.55 +15.45 Main Supply

–15 P22–2, 17 –14.55 –15.45 Main Supply

+5.2 P22–14, 29 +5.04 +5.37 Main Supply

+9 P22–5, 20 +8.82 +9.18 YIG Driver

Connector Pins Minimum Value

(Vdc)

Maximum Value
(Vdc)

Origin

200 Power Supply

1. If the supply voltages are good on the connector pins indicated, replace
the A5 Sampler.

2. If the supply voltages are bad on any of the connector pins indicated,
check the origin of the supply.

3. If the supply voltages are good at the origin, replace the A31 Motherboard.

58 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

4. If the supply voltages are bad at the origin, troubleshoot the problem
using that assembly’s troubleshooting procedure.

201 Tuning + Bias Test

1. Turn power off and remove the A5 Sampler and connect a signal analyzer
to the A5 Sampler J1 input cable on the A31 Motherboard.

2. Turn the signal generator on and check for the presence of a 1 GHz signal
at the level of 0 dBm.

3. If the signal is good on the cable connector J1, replace the A5 Sampler.

4. If the signal is bad, remove the A7 Reference and ohm the cable between

the center pins (a short should occur) and between the center pins and
shielding (an open should occur) of J3 on the A7 Reference and J1 on the
A5 Sampler.

5. If an open is measured between the center pins or a short between center
pins and the shielding, replace the cable.

6. If the cable is good, replace the A7 Reference.

202 Coarse Loop Detector

1. Replace the A5 Sampler

203 YO Loop Detector

1. With power on carefully remove the A5 Sampler, connect a signal analyzer
to J3 on the A31 Motherboard. Set the signal generator to 8 GHz CW then
check for an 8 GHz signal at a power level greater than or equal to –7 dBm
on J3.

2. If the J3 signal is bad, troubleshoot the A29 20 GHz Doubler using the
procedure in the RF path section. If the J3 signal is good, go to the next
step.

3. Connect the signal analyzer to the A6 Frac–N VCO signal on the J6
connection on the A31 Motherboard. With the signal generator set to
8 GHz CW, the A6 Frac–N signal should be at a frequency of 593.75 MHz
and at a power level of +7 dBm.

4. If the signal is good, replace the A5 Sampler, if the signal is bad go to the
A6 Frac–N troubleshooting procedure.

E8257D/67D, E8663D PSG Signal Generators Service Guide 59

Troubleshooting
Troubleshooting Assembly–Level Problems

Self–Tests 3xx: A7 Reference (Standard) Self–Test Errors (For
instruments with serial prefixes < US4805/MY4805)

Before proceeding to the reported self–test error code, check the following
voltages. If any of the voltages are out of specification, troubleshoot the supply
problem first.

Supply Voltage
(Vdc)

+32 P102–7 +31.04 +32.96 Main Supply

+15 P102–6, 21 +14.55 +15.45 Main Supply

–15 P102–2, 17 –14.55 –15.45 Main Supply

+5.2 P102–14, 29 +5.04 +5.37 Main Supply

+9 P102–5, 20 +8.82 +9.18 YIG Driver

Connector Pins Minimum Value

(Vdc)

Maximum Value
(Vdc)

Origin

300 1 GHz Detector

1. Check and remove any connection to the 10 MHz external reference on the
rear panel.

2. If the signal generator continues to fail self–test, replace the A7
Reference.

60 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

301 Tuning Voltage

1. Replace the A7 Reference.

Self–Tests 4xx: A8 Output Self–Test Errors (E8267D only)

Before proceeding to the reported self–test error code, check the following
voltages. If any voltages are out of specification, troubleshoot the supply
problem first.

Supply Voltage
(Vdc)

+15 P52–6, 21 +14.55 +15.45 Main Supply

−15 P52–2, 17 −15.45 −14.55 Main Supply

+5.2 P52–14, 29 +5.04 +5.36 Main Supply

+9 P52–5, 20 +8.82 +9.18 YIG Driver

−6 P52–3, 18 −6.12 −5.88 YIG Driver

Connector Pins Minimum Value

(Vdc)

Maximum Value
(Vdc)

Origin

400 Lowband Ground and PTAT Test

—Replace A8 Output.

E8257D/67D, E8663D PSG Signal Generators Service Guide 61

Troubleshooting
Troubleshooting Assembly–Level Problems

401 Prelevel Loop Test

1. With the signal generator powered up, carefully remove the A8 Output.

2. Set the signal generator to 3 GHz CW.

3. Using a spectrum analyzer measure the A6 Frac–N RF output at J4 of the

A8 Output.

The signal at J4 should be at 3 GHz and ≥0 dBm.

— If the signal is not present, or is not at the correct level, replace the

A6 Frac–N.

— If the signal is present, replace the A8 Output.

Do not re–install the A8 Output with the signal generator turned on, or serious
damage to the signal generator can result.

402 Quadrature DAC Test

— Replace the A8 Output.

403 VBLO Test

— Replace the A8 Output.

404 Marble Test

1. Measure the Q signal from the A13 I/Q Multiplexer:

a. Disconnect the cable from J1052 A31 Motherboard and connect it

to a DVM.

b. Set the CW frequency to 2 GHz.

c. Turn on the I/Q modulation, and make the Q offset the active

function:

1. Press the I/Q hardkey.

2. Select I/Q On > I/Q Ad justments > I/Q Ad justments On > Q
Offset

d. As you rotate the RPG, the voltage displayed on the DVM should

vary from approximately +0.25 Vdc for an offset of 50%, to
approximately −0.25 Vdc for an offset of −50%.

If the signal is bad, check it at J10 of the A13 I/Q Multiplexer.

— If the signal is bad at J10, refer to the A13 I/Q Multiplexer

troubleshooting, on page 55.

— If the signal is good at J10, change the cable.

2. Measure the I signal from the A13 I/Q Multiplexer:

a. Reconnect the cable removed in Step 1

62 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

b. Disconnect the cable from J1053 A31 Motherboard and connect it

to the DVM.

c. Leave the I/Q modulation on, and make the I offset the active

function.

d. As you rotate the RPG, the voltage displayed on the DVM should

vary from approximately +0.25 Vdc for an offset of 50%, to
approximately −0.25 Vdc for an offset of −50%.

If the signal is bad, check it at J9 of the A13 I/Q Multiplexer.

— If the signal is bad at J9, refer to the A13 I/Q Multiplexer

troubleshooting, on page 55.

— If the signal is good at J9, change the cable.

3. If both the I and Q signals are good, reconnect the cable removed in Step 2

Check the signals at the A8 Output board.

a. At J53–8, repeat the Q offset check in Step 1

— If the signal is good, replace the A8 Output board.

— If the signal is bad, replace the A31 Motherboard.

b. At J53–19, repeat the I offset check in Step 2

— If the signal is good, replace the A8 Output board.

— If the signal is bad, replace the A31 Motherboard.

405 Gain Adjustment Test

— Replace the A8 Output.

406 Prelevel Bypass Test

— Replace the A8 Output.

407 Switched Filters Test

— Replace the A8 Output.

408 ALC Reference DAC Test

— Replace the A8 Output.

409 ALC Modulation Test

— Replace the A8 Output.

410 Burst Mod Driver Test

— Replace the A8 Output.

E8257D/67D, E8663D PSG Signal Generators Service Guide 63

Troubleshooting
Troubleshooting Assembly–Level Problems

411 ALC Detector Test

— Replace the A8 Output.

412 Het Band Test

Measure the 1 GHz signal from the A7 Reference board:

1. Turn on the signal generator.

2. Set CW = 200 MHz.

3. Using a spectrum analyzer, probe P51–19.

There should be a 1 GHz signal, that is >−30 dBm.

— If the signal is good, replace the A9 Output.

— If the signal is not good, run the A7 self–tests.

Self–Tests 6xx: A9 YIG Driver Self–Test Errors

64 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

Before proceeding to the reported self–test error code, check the following
voltages. If any are out of specification, troubleshoot the supply problem first.

Supply Voltage
(Vdc)

+32 P112–6 +31.04 +32.96 Main Supply

+15 P112–5, 30 +14.55 +15.45 Main Supply

–15 P112–4, 29 –14.55 –15.45 Main Supply

+5.2 P112–3, 28 +5.04 +5.37 Main Supply

+10 P112–15, 16, 40 +10 +10.4 Main Supply

–7 P112–11, 12, 13, 14, 38 –6.86 –7.14 Main Supply

+5.2 Digital high P111–64, 65, 129, 130 +5.04 +5.36 Main Supply

+3.4 Digital Low P111–60, 61, 62, 63, 125, 126, 127, 128 +3.29 +3.5 Main Supply

Connector Pins Minimum Value

(Vdc)

Maximum Value
(Vdc)

Origin

A9 YIG Driver Output Voltages

If any of the following voltages are out of specification, replace the A9 YIG
Driver:

Supply Voltage
(Vdc)

+9 P112–17, 18, 42 +8.82 +9.18

Connector Pins Minimum Value

(Vdc)

Maximum Value
(Vdc)

–5.2 P112–1, 2, 26, 27 –5.1 –5.3

–6 P112–19, 44 –5.88 –6.12

600 Post Regulator

— Replace the A9 YIG Driver.

601 DACs

— Replace the A9 YIG Driver.

602 PLL Interface

1. Remove the cable that goes from the A5 Sampler to J4 on the A9 YIG
Driver.

2. Loop self–test 602, and use an oscilloscope to measure the voltage on J4.
The voltage should pulse to +10 Vdc.

— If the voltage is +10 Vdc, replace the A9 YIG Driver.

— If the voltage on J4 is bad, replace the A5 Sampler.

E8257D/67D, E8663D PSG Signal Generators Service Guide 65

Troubleshooting
Troubleshooting Assembly–Level Problems

603 FM Driver

1. Remove the cable that goes from the A6 Frac–N to J3 on the A9 YIG
Driver.

2. Loop self–test 603, and use an oscilloscope to measure the voltage on J3.
The voltage should be approximately –1.3 Vdc.

— If the voltage is approximately –1.3 Vdc, replace the A9 YIG Driver.

3. If the voltage is bad at J3, check it entering the A6 Frac–N at P31–11.

The voltage on J3 originates on the A11 Pulse/Analog Modulation
Generator and passes through the A6 Frac–N.

— If the voltage is good entering the A6 Frac–N, troubleshoot the

A6 Frac–N.

— If the voltage is bad at P31, troubleshoot the A11 Pulse/Analog

Modulation Generator.

604 Sweep DACs

— Replace the A9 YIG Driver.

605 Sweep Lock

1. Using an oscilloscope with high input impedance, measure the center pin
of J9 on the A9 YIG Driver.

Source Setup Oscilloscope Setup

Start: 5 GHz 10 ms/div

Stop: 10 GHz 5V/div

Sweep: Freq 1 MΩ

Sweep Time: Auto

Sweep Repeat: Continuous

A positive and negative going signal should be present.

— If the signal is present at J9, replace the A9 YIG Driver.

2. If the signal is not present at J9, measure the center pin of J1032 on the

motherboard.

— If the signal is present, replace the cable.

— If the signal is not present, replace the A6 Frac–N.

66 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

Self–Tests 7xx: A6 Frac–N Self–Test Errors

Before proceeding to the reported self–test error code, check the following
voltages. If any voltages are out of specification, troubleshoot the supply
problem first.

Supply Voltage
(Vdc)

+32 P32–7 +31.04 +32.96 Main Supply

+15 P32–6, 21 +14.55 +15.45 Main Supply

–15 P32–2, 17 –14.55 –15.45 Main Supply

+5.2 P32–14, 29 +5.04 +5.37 Main Supply

+9 P32–5, 20 +8.82 +9.18 YIG Driver

–5.2 P32–4,19 –5.1 –5.3 YIG Driver

–6 P32–3, 18 –5.88 –6.12 YIG Driver

Connector Pins Minimum Value

(Vdc)

Maximum Value
(Vdc)

Origin

700 Ref Voltage

— Replace the A6 Frac–N.

701 Loop Gain

— Replace the A6 Frac–N.

E8257D/67D, E8663D PSG Signal Generators Service Guide 67

Troubleshooting
Troubleshooting Assembly–Level Problems

702 Tuning Voltage

1. Using an oscilloscope, check 10 MHz Synthesis line on P33–15. The signal
period should be 100 ns with an amplitude of approximately 3V

pp

.

— If the signal is good, replace the A6 Frac–N.

2. If the signal is bad, turn the signal generator power off, remove the A6

Frac–N, and measure the signal at P33–15 again.

— If the signal is good, replace the A6 Frac–N.

3. If the signal is still bad, measure P41–5 on the A7 Reference.

— If the signal is good at P41–5, replace the A31 Motherboard.

— If the signal is bad at P41–5, replace the A7 Reference.

703 Output Voltage

1. Using an oscilloscope, check 10 MHz Synthesis line on P33–15. The
signal period should be 100 ns with an amplitude of approximately 3V

pp

.

— If the signal is good, replace the A6 Frac–N.

2. If the signal is bad, turn the signal generator power off, remove the A6

Frac–N, and measure P33–15 again.

— If the signal is good, replace the A6 Frac–N.

3. If the signal is still bad, measure P41–5 on the A7 Reference.

— If the signal is good at P41–5, replace the A31 Motherboard.

— If the signal is bad at P41–5, replace the A7 Reference.

704 Filter Test

1. Refer to Table 1-13, and check J1 on the A6 Frac–N:

a. Turn the signal generator on and remove the A6 Frac–N.

b. Set the signal generator to the first center frequency.

c. Use an extender board cable to connect a spectrum analyzer to J1.

d. Tune the spectrum analyzer to the first J1 frequency, and check for

the correct power.

e. Repeat Step d for the remaining frequencies.

68 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

— If all the signals at J1 are good, continue with Step 3.

Table 1-13

Center Frequency
(GHz)

0.300 4.771

0.500 7.969

0.750 5.971

1.25 4.976

2.0 7.969

3.0 5.971

J1 Frequency
(GHz)

Power at J1
(dBm)

> –6

2. If any signal measured in Step 1 is bad, check the signal out of the
A6 Frac–N output port on the A29 20 GHz Doubler.

— If the signal out the A29 20 GHz Doubler is good, replace the cable.

— If the signal out the A29 20 GHz Doubler is bad, replace the A29

20 GHz Doubler.

3. If all of the signals at J1 are good, turn the signal generator off and
reinstall the A6 Frac–N.

4. Check J4 at the A8 Output (shown on page 95):

a. Power the signal generator on and remove the A8 Output.

b. Use an extender cable to connect a spectrum analyzer to J4.

c. Tune the spectrum analyzer to the first frequency in column one of

Table 1-13, and check for approximately +10 dBm.

— If an RF signal is present on J4, replace the A8 Output.

— If an RF signal is not present on J4, replace the A6 Frac–N.

705 F/2 Test

1. Using an oscilloscope, check the 10 MHz Synthesis line on P33–15. The
signal period should be 100 ns with an amplitude of approximately 3V

— If the signal is good, replace the A6 Frac–N.

2. If the signal is bad, turn the signal generator power off, remove the A6

Frac–N, and measure P33–15 again.

— If the signal is good, replace the A6 Frac–N.

3. If the signal is still bad, measure P41–5 on the A7 Reference.

— If the signal is good at P41–5, replace the A31 Motherboard.

pp

.

E8257D/67D, E8663D PSG Signal Generators Service Guide 69

Troubleshooting
Troubleshooting Assembly–Level Problems

— If the signal is bad at P41–5, replace the A7 Reference.

706 FM Path Test

1. Using an oscilloscope, check P31–22 (FM_On_H):

a. Loop self–test 706

b. Check for a TTL transition from 0 Vdc to +5 Vdc.

— If the signal is not present, refer to A5 Sampler

troubleshooting.

2. If the signal is present, check P31–11 (FM):

a. Loop self–test 706.

b. Check for a 0 to 3.3 Vdc transition.

— If the signals is present, replace the A6 Frac–N.

— If the signal is not present, refer to A11 Pulse/Analog

Modulation Generator troubleshooting.

707 Sweep Phase Detector Test

1. Replace the A6 Frac–N.

Self–Tests 7xx: A45 Frac–N Self–Test Errors (option UNY)

720 Ref Voltage Test

— Replace the A45.

721 1 GHz Input Test

Disconnect the cable W155 from the Frac-N A45J4 and connect to a signal
analyzer. Check for 1 GHz and its power, approximately 0 dBm.

— If the signal is present, replace A45.

— If the signal is not present, replace W155 or A46.

722 Open Loop VCO Test

— Replace the A45.

723 Open Loop F/2 Test

— Replace the A45.

724 Close Loop VCO Test

— Replace the A45.

70 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

725 Low Band Filter Test

— Replace the A45.

Self–Tests 9xx: A10 ALC Self–Test Errors

Before proceeding to the reported self–test error code, check the following
voltages. If any voltages are out of specification, troubleshoot the supply
problem first.

Supply
Voltage
(Vdc)

+32 P122–4 +31.04 +32.96 Main Supply

+15 P122–28 +14.55 +15.45 Main Supply

–15 P122–3 –14.55 –15.45 Main Supply

+5.2 P122–2, 27 +5.04 +5.37 Main Supply

–5.2 P122–1, 26 +5.30 +5.10 YIG Driver

E8257D/67D, E8663D PSG Signal Generators Service Guide 71

Connector Pins Minimum

Value
(Vdc)

Maximum
Value
(Vdc)

Origin

Troubleshooting
Troubleshooting Assembly–Level Problems

Supply
Voltage
(Vdc)

+5.2 Digital high P121–64, 65, 129, 130 +5.04 +5.36 Main Supply

+3.4 Digital Low P121–60, 61, 62, 63, 125, 126, 127, 128 +3.29 +3.5 Main Supply

Connector Pins Minimum

Value
(Vdc)

Maximum
Value
(Vdc)

Origin

900 Power Supply

— Replace the 10 ALC assembly.

901 Detector Test

1. Using a digital voltmeter, check J3 for approximately –0.29 Vdc:

a. Turn the signal generator’s RF power on.

b. Set the frequency to 10 GHz and the RF power level to +20 dBm,

ALC off.

c. Disconnect the cable from J3 of the A10 ALC (W15) and connect the

cable to the voltmeter.

— If the signal is not present, refer to highband RF loop

troubleshooting.

— If the signal is present, replace the A10 ALC.

902 Detector Level to ALC Ref

1. Using a digital voltmeter, check J5 for –2.3 Vdc:

a. Turn the signal generator’s RF power on.

b. Set the frequency to 1 GHz and the RF power level to +20 dBm, ALC

off.

c. Disconnect the cable from J5 of the A10 ALC (W14) and connect the

cable to the voltmeter.

— If the signal is not present, refer to lowband RF loop

troubleshooting.

2. If the signal is present, check J3 for –0.29 Vdc:

a. On the signal generator, change the frequency to 10 GHz.

b. Disconnect the cable from J3 of the A10 ALC (W15) and connect the

cable to the voltmeter.

— If the signal is not present, refer to highband RF loop

troubleshooting.

— If the signal is present, replace the A10 ALC.

72 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

903 Level Test

1. Using a digital voltmeter, check J3 for –0.29 Vdc:

a. Turn the signal generator’s RF power on.

b. Set the frequency to 10 GHz and the RF power level to +20 dBm.

c. Disconnect the cable from J3 of the A10 ALC (W15) and connect the

cable to the voltmeter.

— If the signal is not present, refer to highband RF loop

troubleshooting.

— If the signal is present, replace the A10 ALC.

904 Scalar Mod Pulse

— Replace the A10 ALC.

905 ALC Mod Test

— Replace the A10 ALC.

906 Scan Mod Test

— Replace the A10 ALC.

E8257D/67D, E8663D PSG Signal Generators Service Guide 73

Troubleshooting
Troubleshooting Assembly–Level Problems

Self–Tests 10xx: A7 Reference (Option UNR/UNX and Instruments
with Serial Prefixes ≥ US4805/MY4805) Self–Test Errors

Before proceeding to the reported self–test error code, check the following
voltages. If any voltages are out of specification troubleshoot the supply
problem first.

Supply Voltage
(Vdc)

+15 P42–6, 21 +14.55 +15.45 Main Supply

–15 P42–2, 17 –14.55 –15.45 Main Supply

+9 P42–5, 20 +8.82 +9.18 YIG Driver

Connector Pins Minimum Value

(Vdc)

Maximum Value
(Vdc)

Origin

1000 Power Supply

— Replace the A7 Reference.

1001 10 MHz Test

1. Using an oscilloscope, check P41–2 for a 10 MHz signal greater than 1.12
V

. If the signal is present, replace the A7 Reference.

p–p

2. If the signal is not present, the problem could be the 10 MHz Reference or
the signal path from the 10 MHz Reference.

74 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

3. Check the 10 MHz reference oscillator output signal.

a. If the 10 MHz signal is not present on the output port, measure the

10 MHz power supply voltages on the rear panel interface board.
The following voltages should be observed:

— Pin 1 ground

— Pin 2 +12V

— Pin 3 ground

— Pin 4 a positive DC voltage around +3.8V should be present (oven

cold raw voltage may vary).

b. If the power supply voltages are good, replace the 10 MHz

reference.

c. If the power supply vol tages are bad, replace the rear panel

interface board.

4. If the 10 MHz signal is present out of the reference oscillator, but not on
the A31 mother board at P41–2, reconnect the cable going to the 10 MHz
signal.

a. Measure the end of the cable going to the A31 mother board at

J1041.

b. If the signal is bad, replace the cable.

c. If the signal is good, go to Step 5.

5. Measure the ohmic resistance between the J1041 center pin and P41–2

and the J1041 center pin to ground.

a. If the trace is open or shorted to ground, replace the A31 mother

board.

b. If the J1041 is not shorted to ground and the J1041 to P41–2 is not

open, remove the A7 board and measure P41–2.

c. If the signal is now present, replace the A7 board.

d. If the signal is still missing, replace the A31 mother board.

1002 1 GHz Test

— Replace the A7 Reference.

E8257D/67D, E8663D PSG Signal Generators Service Guide 75

Troubleshooting
Troubleshooting Assembly–Level Problems

Self–Tests 11xx: A18 CPU Self–Test Errors

1100 Power Supply

The A18 CPU self–test verifies the presence of the supplies listed. These
supplies are not checked during the turn–on check and are not necessary for
the turn–on check to pass.

1. After running self–test, View Details and see which supply failed.

2. If the 10 VRef has failed, replace the A18 CPU. The 10 VRef is generated

on the A18 CPU and used for the ADC circuit.

3. For a self–test failure other than the 10 VRef, measure the appropriate
connector pin listed in the following table.

Connector P223 Supply Vol tage Voltage Range

Pin 1 –5.2 Vdc –5.2 ±.1 Vdc

Pin 17 –6 Vdc –6 ±.12 Vdc

Pin 18 +9 Vdc +9 ±.18 Vdc

76 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

4. If the voltages are present on the A31 Motherboard, turn power off,
remove the A18 CPU and inspect the connector. If the pins look good,
replace the A18 CPU.

5. If a supply voltage is not present on the connector, measure the
appropriate point listed in the following table:

Connector P112 Supply Vol tage Voltage Range

Pin 1, 2, 26, 27 –5.2 Vdc –5.2 ± 0.1 Vdc

Pin 19, 44 –6 Vdc –6 ± 0.12 Vdc

Pin 17, 18, 42 +9 Vdc +9 ± 0.18 Vdc

6. If the voltage is present on P112 but not present on P223, replace the A31
Motherboard.

7. If the voltages are not present on P112, troubleshoot the A9 YIG Driver.

Self–Tests 12xx: A26 MID Self–Test Errors (E8257D)

Before proceeding to the reported self–test error code, check the following
voltages in. If any of these voltages are out of specification, troubleshoot the
supply problem first.

E8257D/67D, E8663D PSG Signal Generators Service Guide 77

Troubleshooting
Troubleshooting Assembly–Level Problems

Supply
Voltage
(Vdc)

+32 P201–11 P201–1 +31.04 +32.96 Main Supply

+15 P201–12, 13, 14 P201–2, 3, 4 +14.55 +15.45 Main Supply

–15 P201–21, 22 P201–11, 12 –15.45 –14.55 Main Supply

+5.2 P201–7, 8, 9, 10, 23, 24, 25,

+10 P201–15, 16, 17, 18, 19, 20 P201–5, 6, 7, 8, 9, 10 +9.7 +10.3 Main Supply

+8 P201–39 P201–29 +7.5 +8.5 MID

–7 P201–40, 43, 56 N/A –7.21 –6.79 Main Supply

–5.2 P201–41, 42 P201–31, 32 –5.30 –5.10 YIG Driver

+5.2 Digital high P201–33 P201–23 +5.04 +5.36 Main Supply

+3.4 Digital Low P201–34 P201–24 +3.3 +3.5 Main Supply

E8257D
Connector
Pins

26, 27, 28

All Other Models
Connector
Pins

P201–13, 14, 15, 16, 17, 18+5.04 +5.36 Main Supply

Minimum
Value
(Vdc)

Maximum
Value
(Vdc)

Origin

1200 Power Supply

1. Press View Test Info and highlight Self Test 1200. Press View Details.

2. From the displayed self–test results, determine which supply or supplies

failed.

3. Refer to the following table; disconnect one microcircuit at a time and run
self–test 1200.

Microcircuit A26 MID

Connector

A30 Modulation Filter J31

A29 20 GHz Doubler J32

A27 40 GHz Doubler J33

A36 Quadraplier J34

+12V +8V +6.5V +3.5V −3V

XX

XX

X

XXX

— If the test passes after disconnecting one or more microcircuits,

replace the microcircuit.

— If self–test still fails after disconnecting all the microcircuits,

replace the A26 MID.

1201 Mod Filter

1. Disconnect the cable between the A23 Lowband Coupler/Detector and the
A30 Modulation Filter, and connect a spectrum analyzer to the cable.

78 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

2. Tune the source across the lowband frequencies (250 kHz to 3.2 GHz) and
record the lowest power level.

3. Disconnect the cable coming from the A29 20 GHz Doubler, and connect
the spectrum analyzer to this cable.

4. Tune the source across the A29 20 GHz Doubler band of frequencies
(3.2 GHz to 20 GHz) and record the lowest power level.

5. Determine the expected levels using the tools described in

“Troubleshooting RF Power Levels” on page 122, and compare them to the

measured levels.

— If the power level in both paths is good, replace the A30 Modulation

Filter.

— If the power level in either path is bad, troubleshoot that path.

— If the power level in both paths is bad, check the signal levels out of

the A28 YIG Oscillator.

1202 A29 20 GHz Doubler

1. Disconnect the cable between the A28 YIG Oscillator and the A29 20 GHz
Doubler, and connect a spectrum analyzer to the cable.

2. Tune the source frequency across the A28 YIG Oscillator range (3.2 GHz to
10 GHz) noting the lowest power level.

3. Determine the expected levels using the tools described in

“Troubleshooting RF Power Levels” on page 122, and compare them to the

measured levels.

— If the power level is good, replace the A29 20 GHz Doubler.

— If the power level is bad, replace the A28 YIG Oscillator.

1203 40 GHz Doubler (Option 540)

1. Disconnect the 0 to 20 GHz cable between the A30 Modulation Filter and
the A27 40 GHz Doubler, and connect a spectrum analyzer to the cable.

2. Tune the source from 250 kHz to 20 GHz, and record the lowest power
level.

3. Disconnect the 10 to 20 GHz cable that comes from the A30 Modulation
Filter, and connect the spectrum analyzer to this cable.

4. Tune the source from 20 GHz to 40 GHz, recording the lowest power level.

5. Determine the expected levels using the tools described in

“Troubleshooting RF Power Levels” on page 122, and compare them to the

measured levels.

— If both power levels are good, replace the A27 40 GHz Doubler.

— If either power level is bad, troubleshoot the path.

E8257D/67D, E8663D PSG Signal Generators Service Guide 79

Troubleshooting
Troubleshooting Assembly–Level Problems

1204 RF Path

This test checks for a dc voltage on the A10 ALC from the A23 Lowband
Coupler/Detector and
A24 Highband Coupler and A25 Highband Detector.

1. Connect a spectrum analyzer to the RF output of the signal generator.

2. Turn the RF power on and verify the presence of an RF signal on the

output.

— If no RF signal is present, troubleshoot the RF path problem (see

“Troubleshooting the RF Path” on page 122).

3. If an RF signal is present on the RF output, set the signal generator to
4 GHz and 0 dBm.

4. Measure the dc voltage on the cable going to J3 of the A10 ALC. The
signal should be > –600 mV.

— If the signal at J3 is good, go to step 6.

5. If no dc signal is present on the cable to J3, check the output at the

highband detector.

— If the signal is good at the detector, replace the cable.

— If no signal is present at the output of the highband detector,

replace the highband detector.

6. If the signal at J3 is good, set the signal generator’s frequency to <1 GHz,
the power to 0 dBm, and measure the dc voltage on the cable going to J5
on the A10 ALC.

— If the dc voltage is –5.25 Vdc, replace the A10 ALC.

7. If other dc voltages are present, check for dc voltage on the output of the

lowband detector.

— If a dc voltage is present, replace the cable.

— If no dc voltage is present, replace the lowband detector.

1205 LB Pulse Mod

Lowband Pulse On

1. Disconnect the cable from J5 of A10 ALC, and connect the cable to a DVM
(this is the lowband detector output).

2. On the signal generator, set the following:

Center Frequency: 3 GHz
Power: +20 dBm
Pulse Modulation: On

80 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

Period: 40s
Pulse Wid th: 10 ns
RF: On

3. The voltage measured by the DVM should be approximately 0V. If it is not,
use an oscilloscope to view P131–6 of the A31 Motherboard (this is the
pulse signal out of the A11 Pulse/Analog Modulation Generator).

Change the pulse period to 1 ms and the pulse wid th to 500 μs.

— If the pulse is not present, perform the A11 Pulse/Analog

Modulation Generator self–test, and follow the troubleshooting
procedure.

4. If pulse modulation is working, perform the A8 Output self–test.

— If the self–test passes, refer to “Troubleshooting the RF Path” on

page 122, and check the lowband path.

— If the self–test fails, refer to the A8 Output test troubleshooting.

Lowband Pulse Off

1. Disconnect the cable from J5 of A10 ALC, and connect the cable to a DVM
(this is the lowband detector output).

2. On the signal generator, set the following:

Center Frequency: 3 GHz
Power: +20 dBm
Pulse Modulation: On
Period: 40s
Pulse Wid th: 39.9s
RF: On

3. The voltage measured by the DVM should be approximately −2.2 V. If it is
not, use an oscilloscope to view P131–6 of the A31 Motherboard (this is
the pulse signal out of the A11 Pulse/Analog Modulation Generator).

Change the pulse period to 1 ms and the pulse wid th to 500 μs.

— If the pulse is not present, perform the A11 Pulse/Analog

Modulation Generator self–test, and follow the troubleshooting
procedure.

4. If pulse modulation is working, perform the A8 Output self–test.

— If the self–test passes, refer to “Troubleshooting the RF Path” on

page 122, and check the lowband (<3.2 GHz) path.

— If the self–test fails, refer to the A8 Output test troubleshooting.

E8257D/67D, E8663D PSG Signal Generators Service Guide 81

Troubleshooting
Troubleshooting Assembly–Level Problems

1208 Quadraplier

1. If the power supplies +15V, −15V, −3V, −5.2V, +6.5V, +3.5V, or −3V fail, refer
to the table on page 78, and check the supplies used by the A35 I/Q
Modulator as they leave A26 MID connector.

If the signals are good at the A26 MID connector, replace the A36
Quadraplier.

2. If the TC902, TC956 or any of the drain currents fail (test indexes 6 through

24), replace the A36 Quadraplier.

3. If self–test 20–40 GHz Prelevel, index 25, fails:

a. On the signal generator, set the following:

Center Frequency: 30 GHz
Power: −20 dBm
RF: On

b. Remove the cable from J6 of the Quadraplier Bias Board and

connect it to a DVM.

c. The signal should measure approximately +5.2 Vdc.

1. If the signal is bad, troubleshoot the RF path.

2. If the signal is good, replace the A36 Quadraplier.

4. If self–test 20–40 GHz Prelevel, index 26, fails:

a. On the signal generator, set the following:

Center Frequency: 45GHz
Power: −20 dBm
RF: On

b. Remove the cable from J7 of the Quadraplier Bias Board and

connect it to a DVM.

c. The signal should measure approximately +5.4 Vdc.

1. If the signal is bad, troubleshoot the RF path.

2. If the signal is good, replace the A36 Quadraplier.

82 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

Self–Tests 12xx: A26 MID Self–Test Errors (E8267D)

Before proceeding to the reported self–test error code, check the following
voltages in. If any of these voltages are out of specification, troubleshoot the
supply problem first.

Supply
Voltage
(Vdc)

+32 P201–11 P201–1 +31.04 +32.96 Main Supply

+15 P201–12, 13, 14 P201–2, 3, 4 +14.55 +15.45 Main Supply

–15 P201–21, 22 P201–11, 12 –15.45 –14.55 Main Supply

+5.2 P201–7, 8, 9, 10, 23, 24, 25,

+10 P201–15, 16, 17, 18, 19, 20 P201–5, 6, 7, 8, 9, 10 +9.7 +10.3 Main Supply

+8 P201–39 P201–29 +7.5 +8.5 MID

–7 P201–40, 43, 56 N/A –7.21 –6.79 Main Supply

–5.2 P201–41, 42 P201–31, 32 –5.30 –5.10 YIG Driver

+5.2 Digital high P201–33 P201–23 +5.04 +5.36 Main Supply

+3.4 Digital Low P201–34 P201–24 +3.3 +3.5 Main Supply

E8267D
Connector
Pins

26, 27, 28

All Other Models
Connector
Pins

P201–13, 14, 15, 16, 17, 18+5.04 +5.36 Main Supply

Minimum
Value
(Vdc)

Maximum
Value
(Vdc)

Origin

1200 Power Supply

1. Press View Test Info and highlight Self Test 1200. Press View Details.

E8257D/67D, E8663D PSG Signal Generators Service Guide 83

Troubleshooting
Troubleshooting Assembly–Level Problems

2. From the displayed self–test results, determine which supply or supplies
failed.

3. Refer to the following table; disconnect one microcircuit at a time and run
self–test 1200.

Microcircuit
(E8267D)

A30 Modulation Filter J31

A29 20 GHz Doubler J32

A27 40 GHz Doubler J36

A35 3–20 GHz IQ Modulator J34

A37 Upconverter J35

A26 MID
Connector

+12V +8V +9V +5.2V −5.2V

XX X X

XX X X

XXX

XXX X X

XX X X

— If the test passes after disconnecting one or more microcircuits,

replace the microcircuit.

— If self–test still fails after disconnecting all the microcircuits,

replace the A26 MID.

1201 Mod Filter

1. Disconnect the cable between the A23 Lowband Coupler/Detector and the
A30 Modulation Filter, and connect a spectrum analyzer to the cable.

2. Tune the source across the lowband frequencies (250 kHz to 3.2 GHz) and
record the lowest power level.

3. Disconnect the cable coming from the A29 20 GHz Doubler, and connect
the spectrum analyzer to this cable.

4. Tune the source across the A29 20 GHz Doubler band of frequencies
(3.2 GHz to 20 GHz) and record the lowest power level.

5. Determine the expected levels using the tools described in

“Troubleshooting RF Power Levels” on page 122, and compare them to the

measured levels.

— If the power level in both paths is good, replace the A30 Modulation

Filter.

— If the power level in either path is bad, troubleshoot that path.

— If the power level in both paths is bad, check the signal levels out of

the A28 YIG Oscillator.

1202 A29 20 GHz Doubler

1. Disconnect the cable between the A28 YIG Oscillator and the A29 20 GHz
Doubler, and connect a spectrum analyzer to the cable.

84 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

2. Tune the source frequency across the A28 YIG Oscillator range (3.2 GHz to
10 GHz) and record the lowest power level.

3. Determine the expected levels using the tools described in

“Troubleshooting RF Power Levels” on page 122, and compare them to the

measured levels.

— If the power level is good, replace the A29 20 GHz Doubler.

— If the power level is bad, replace the A28 YIG Oscillator.

1203 40 GHz Doubler

1. Disconnect the 13.3 to 18 GHz cable between the A29 20 GHz Doubler
and the A27 40 GHz Doubler, and connect a spectrum analyzer to the
cable.

2. Determine the expected levels using the tools described in

“Troubleshooting RF Power Levels” on page 122, and compare them to the

measured levels.

— If both power level is good, replace the A27 40 GHz Doubler.

1204 RF Path

This test checks for a dc voltage on the A10 ALC from the A23 Lowband
Coupler/Detector and
A24 Highband Coupler and A25 Highband Detector.

1. Connect a spectrum analyzer to the RF output of the signal generator.

2. Turn the RF power on and verify the presence of an RF signal on the

output.

— If no RF signal is present, troubleshoot the RF path problem (see

“Troubleshooting the RF Path” on page 122).

3. If an RF signal is present on the RF output, set the signal generator to
4 GHz and 0 dBm.

4. Measure the dc voltage on the cable going to J3 of the A10 ALC. The
signal should be approximately –0.3 Vdc.

— If the signal at J3 is good, go to step 6.

5. If no dc signal is present on the cable to J3, check the output at the

highband detector.

— If the signal is good at the detector, replace the cable.

— If no signal is present at the output of the highband detector,

replace the highband detector.

6. If the signal at J3 is good, set the signal generator’s frequency to <1 GHz,
the power to 0 dBm, and measure the dc voltage on the cable going to J5
on the A10 ALC.

E8257D/67D, E8663D PSG Signal Generators Service Guide 85

Troubleshooting
Troubleshooting Assembly–Level Problems

— If the dc voltage is approximately –2.2 Vdc, replace the A10 ALC.

7. If other dc voltages are present, check for dc voltage on the output of the

lowband detector.

— If a dc voltage is present, replace the cable.

— If no dc voltage is present, replace the lowband detector.

1205 LB Pulse Mod

Lowband Pulse On

1. Disconnect the cable from J5 of the A10 ALC, and connect the cable to a
DVM (this is the lowband detector output).

2. On the signal generator, set the following:

Center Frequency: 3 GHz
Power: +20 dBm
Pulse Modulation: On
Period: 40s
Pulse Wid th: 10 ns
RF: On

3. The voltage measured by the DVM should be approximately 0V. If it is not,
use an oscilloscope to view P131–6 of the A31 Motherboard (this is the
pulse signal out of the A11 Pulse/Analog Modulation Generator).

Change the pulse period to 1 ms and the pulse wid th to 500 μs.

— If the pulse is not present, perform the A11 Pulse/Analog

Modulation Generator self–test, and follow the troubleshooting
procedure.

4. If pulse modulation is working, perform the A8 Output self–test.

— If the self–test passes, refer to “Troubleshooting the RF Path” on

page 122, and check the lowband path.

— If the self–test fails, refer to the A8 Output test troubleshooting.

Lowband Pulse Off

1. Disconnect the cable from J5 of the A10 ALC, and connect the cable to a
DVM (this is the lowband detector output).

2. On the signal generator, set the following:

Center Frequency: 3 GHz
Power: +20 dBm
Pulse Modulation: On
Period: 40s
Pulse Wid th: 39.9s
RF: On

86 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

3. The voltage measured by the DVM should be approximately −1.8 V. If it is
not, use an oscilloscope to view P131–6 of the A31 Motherboard (this is
the pulse signal out of the A11 Pulse/Analog Modulation Generator).

Change the pulse period to 1 ms and the pulse wid th to 500 μs.

— If the pulse is not present, perform the A11 Pulse/Analog

Modulation Generator self–test, and follow the troubleshooting
procedure.

4. If pulse modulation is working, perform the A8 Output self–test.

— If the self–test passes, refer to “Troubleshooting the RF Path” on

page 122, and check the lowband (<3.2 GHz) path.

— If the self–test fails, refer to the A8 Output test troubleshooting.

1206 20 GHz IQ Modulator

1. If the power supplies +8V AF, +2.5V AF, +9V AFSW, +12V AFSW, +15V
VLIMF, or −15VSWBIAS fail, refer to the table page 83, and check the
supplies used by the A35 I/Q Modulator as they leave the A26 MID
connector.

— If the signals are good at the A26 MID connector, replace the A35

I/Q Modulator.

2. If the VD724 Doubler, test index 6, fails, replace the A35 I/Q Modulator.

3. If self–test TC672RF indexes 8, 9, 11, or 12 fail:

a. Remove the cable from J2 of the A29 20 GHz Doubler.

b. While measuring the signal at J2 with a spectrum analyzer, run

self–test 1206. You should see a +20 dBm signal at 5 GHz.

— If the signal is bad, troubleshoot the RF path.

— If the signal is good and TC672RF indexes 8, 11, or 12 have

failed, replace the A35 I/Q Modulator.

— If the signal is good and TC672RF index 9 has failed, you must

also check the I/Q signals from the A13 I/Q Multiplexer:

1. Remove the cable from J6 (I) of the A35 I/Q
Modulator, and connect it to an oscilloscope.

2. Execute a single 1206 self–test. The signal on the
oscilloscope should pulse to approximately −0.5 Vdc
for approximately 500 ms.

— If the signal is bad, refer to the A13 I/Q

Multiplexer troubleshooting.

3. If the signal is good, reconnect the cable to J6,
remove the cable to J7 (Q), and connect this cable
to the oscilloscope.

E8257D/67D, E8663D PSG Signal Generators Service Guide 87

Troubleshooting
Troubleshooting Assembly–Level Problems

4. Execute a single 1206 self–test. The signal on the
oscilloscope should pulse to approximately
18 millivolts for approximately 500 ms.

— If the signal is bad, refer to the A13 I/Q

Multiplexer troubleshooting.

— If both the I and Q signals are good,

replace the A35 I/Q Modulator.

4. If self–test Quad Loop Integrator fails, replace the A35 I/Q Modulator.

1207 Upconverter

1. If the power supplies +6.5V or +5.2V fail, refer to the table page 83, and
check the supplies used by the A37 Upconverter as they leave the A26
MID connector.

— If the signals are good at the A26 MID connector, replace the A37

Upconverter.

2. If any of the drain currents fail (test indexes 3 through 18), replace the A37
Upconverter.

3. If self–tests ALC (indexes 18 through 32) Vdet (indexes 24 through 26) fail:

a. On the signal generator, set the following:

Center Frequency: Value at which ACL or Vdet self–test failed (e.g.

20.01 GHz, 28.5 GHz, etc.)
Power: +20 dBm
RF: On

b. Disconnect A35–J24 and connect a spectrum analyzer to the A35

I/Q Modulator. This is the IF signal to the A37 Upconverter.

c. For RF signals >20 GHz to 28.5 GHz, the IF signal is mixed with the

LO to produce the downconverted RF signal. The IF signal will range
in frequency from 6.667 GHz to 9.50 GHz with an amplitude of
>5 dBm.

— If the signal is bad, troubleshoot the A35 RF path.

— If the signal is good, reconnect A35–J24.

d. On the A37 Upconverter, disconnect J5 and connect a spectrum

analyzer to the cable coming from the A27 40 GHz Doubler. This is
the LO signal to the A37 Upconverter.

e. For RF signals >20 GHz to 28.5 GHz, the IF signal is mixed with the

LO to produce the downconverted RF signal. The LO signal will
range in frequency from 26.667 GHz to 38 GHz and will be four
times the IF frequency. The amplitude of the LO signal should be
>5 dBm.

— If the signal is bad, troubleshoot the A35 RF path.

88 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

— If the signal is good, reconnect A37–J5 and replace the A37

Upconverter.

f. For RF signals >28.5 GHz, the IF signal frequency is mixed with the

LO to produce the upconverted RF signal. The IF signal will range in
frequency from 5.73 GHz to 8.82 GHz. The LO signal will range in
frequency from 22.8 GHz to 38.2 GHz and will be four times the IF
frequency. Repeat steps a through e, but with an RF signal
>28.5 GHz.

Self–Tests 13xx: A11 Analog/Pulse Modulation Generator Self–Test
Errors

Before proceeding to the reported self–test error code, check the following
voltages. If any of these voltages are out of specification troubleshoot the
supply problem first.

Supply Voltage
(Vdc)

+15 P132–28 +14.55 +15.45 Main Supply

–15 P132–3 –14.55 –15.45 Main Supply

+5.2 P132–2, 27 +5.04 +5.37 Main Supply

–5.2 P132–1, 26 –5.3 –5.1 YIG Driver

E8257D/67D, E8663D PSG Signal Generators Service Guide 89

Connector Pins Minimum Value

(Vdc)

Maximum Value
(Vdc)

Origin

Troubleshooting
Troubleshooting Assembly–Level Problems

Supply Voltage
(Vdc)

+5.2 Digital high P131–64, 65, 129,

+3.4 Digital Low P131–60, 61, 62, 63,

Connector Pins Minimum Value

130

125, 126, 127, 128

1300 Power Supply

— Replace the A11 Reference.

1301 Internal Pulse Generator Clock

1. Using an oscilloscope, measure P131–91 for a 10 MHz signal at 3.5 Vpp.

— If the signal is good, replace the A11 Pulse/Analog Modulation

Generator.

2. If the signal is bad, check P41–7.

— If the signal is good on P41–7, replace the A31 Motherboard.

— If the signal is bad on P41–7, replace the A7 Reference.

Maximum Value

(Vdc)

+5.04 +5.36 Main Supply

+3.29 +3.5 Main Supply

(Vdc)

Origin

1302 Output

— Replace A11 Pulse/Analog Modulation Generator.

1303 Voltage Ref DAC

— Replace A11 Pulse/Analog Modulation Generator.

1304 20 GHz Pulse

— Replace A11 Pulse/Analog Modulation Generator.

1305 Not Used

1306 Standard 3 GHz Pulse

— Replace A11 Pulse/Analog Modulation Generator.

1307 High Performance 3 GHz Pulse

— Replace A11 Pulse/Analog Modulation Generator.

1308 Numeric Synthesizer

— Replace A11 Pulse/Analog Modulation Generator.

90 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

1309 Function Generator Channel 1

— Replace A11 Pulse/Analog Modulation Generator.

1310 Function Generator Channel 2

— Replace A11 Pulse/Analog Modulation Generator.

1311 Frequency Modulator

— Replace A11 Pulse/Analog Modulation Generator.

1312 Low Frequency Out

— Replace A11 Pulse/Analog Modulation Generator.

1313 Amplitude Modulation

— Replace A11 Pulse/Analog Modulation Generator.

1314 External 1

— Replace A11 Pulse/Analog Modulation Generator.

1315 External 2

— Replace A11 Pulse/Analog Modulation Generator.

1316 AM Path Loss

— Replace A11 Pulse/Analog Modulation Generator.

E8257D/67D, E8663D PSG Signal Generators Service Guide 91

Troubleshooting
Troubleshooting Assembly–Level Problems

Self–Tests 16xx for the A14 Baseband Generator (Option 601/602)

Power Supply Voltage
(Vdc)

+32 P162 – 4 +31.04 +32.96 Main Supply

+15 P162 – 28 +14.55 +15.45 Main Supply

–15 P162 – 3 –15.45 –14.55 Main Supply

–5.2 V2 P162 – 1, 26 –5.36 –5.04 A31

+5.2 P162 – 5, 27 +5.04 +5.36 Main Supply

+5.2 D P161 – 64, 65, 129, 130 +5.04 +5.36 Main Supply

+3.4 VD P161 – 60, 61, 62, 63, 125,

+2.6 VD P161 – 57, 58, 59, 123, 124 +2.52 +2.68 Main Supply

+1.95 VD P161 – 52, 118 +1.89 +2.01 A31

+1.8 VD P161 – 55, 56, 120, 121,

A31 Motherboard
Connector Pins

126, 127, 128

122

Minimum
(Vdc)

+3.30 +3.50 Main Supply

+1.75 +1.85 A31

Maximum
(Vdc)

Origin

Motherboard

Motherboard

Motherboard

92 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

1600 Host <–> BBG Comm

— If the +3.4 VD, +2.6 VD, and +1.9 VD supply voltages are good on the A31

Motherboard, replace the A14 Baseband Generator.

— If the +3.4 VD or +2.6 VD supply voltages are bad on the A31 Motherboard,

check the origin of the supply.

— If the supply voltage is good at the origin, replace the A31

Motherboard.

— If the supply voltage is bad at the origin, troubleshoot the A19 Power

Supply.

— If the +1.9 VD supply voltage is bad on the A31 Motherboard, check the

+3.4 VD supply at the A19 Power Supply.

— If the +3.4 VD supply is good at the A19 Power Supply, replace the

A31 Motherboard.

— If the +3.4 VD supply is bad at the A19 Power Supply, troubleshoot

A19 Power supply.

1601 Apps 1 <–> Apps 2 Comm

— If the +1.8 VD supply voltage is good on the A31 Motherboard, replace the

A14 Baseband Generator

— If the +1.8 VD supply voltage is bad on the A31 Motherboard, check the

+2.6 VD supply at the A19 Power Supply.

— If the +2.6 VD supply is good at the A19 Power Supply, then replace

the A31 Motherboard.

— If the +2.6 VD supply is bad at the A19 Power Supply, then

troubleshoot the A19 Power supply.

1602 Apps 1 <–> SH4 Comm

— Replace the A14 Baseband Generator

1603 Apps 2 <–> SH4 Comm

— Replace the A14 Baseband Generator

1604 FLiegan <–> Apps 2 Comm

— Replace the A14 Baseband Generator

1605 SRAM Test

— Replace the A14 Baseband Generator

1606 SDRAM Test

— Replace the A14 Baseband Generator

E8257D/67D, E8663D PSG Signal Generators Service Guide 93

Troubleshooting
Troubleshooting Assembly–Level Problems

1607 Paren <–> SH4 Comm

— Replace the A14 Baseband Generator

1608 VCO Tune Test

— If the +32 V, ±15V, –5.2 V2, and + 5.2V supply voltages are good on the

motherboard, use an oscilloscope to check the 10 MHz signal on the A31
Motherboard at P161 pins 26 and 91. The signal should have a period of
100 ns with an amplitude greater than 0.4 Vpp.

— If the 10 MHz signal is good, replace the A14 Baseband Generator.

— If the 10 MHz signal is bad, check it at the A7 Reference.

• If the 10 MHz signal is bad at the A7 Reference, refer to A7
Reference troubleshooting.

• If the 10 MHz signal is good at the A7 Reference, replace the
A31 Motherboard.

— If the +32 V, ± 15 V, and +5.2 V supply voltages are bad on the motherboard,

check the origin of the supply.

— If the supply voltage is good at the origin, replace the A31

Motherboard.

— If the supply voltage is bad at the origin, troubleshoot the A19 Power

Supply.

— If the –5.2 V2 supply voltage is bad on the motherboard, check the –7 V

supply voltage at the A19 Power Supply.

— If the –7 V supply voltage is good at the A19 Power Supply, replace

the A31 Motherboard.

— If the –7 V supply voltage is bad at the A19 Power Supply,

troubleshoot the A19 Power supply.

1609 IQ DAC Output

— Replace the A14 Baseband Generator

1610 PLL Test

— Replace the A14 Baseband Generator

94 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

Self–Tests 22xx: A8 Output Self–Test Errors

Before proceeding to the reported self–test error code, check the following
voltages. If any voltages are out of specification troubleshoot the supply
problem first.

Supply Voltage
(Vdc)

+15 P52–6, 21 +14.55 +15.45 Main Supply

–15 P52–2, 17 –15.45 –14.55 Main Supply

+5.2 P52–14, 29 +5.04 +5.36 Main Supply

+9 P52–5, 20 +8.82 +9.18 YIG Driver

–6 P52–3, 18 –6.12 –5.88 YIG Driver

Connector Pins Minimum Value

(Vdc)

Maximum Value
(Vdc)

Origin

2200 Ground and PTAT Test

—Replace A8 Output.

E8257D/67D, E8663D PSG Signal Generators Service Guide 95

Troubleshooting
Troubleshooting Assembly–Level Problems

2201 Prelevel Loop Test

If the A8 Output board has been replaced recently and self test 2201 is
failing, run the ALC Mod Cal adjustment before replacing the A8 Output
board. See Chapter 4, “Post–Repair Procedures.”

1. With the signal generator powered on, carefully remove the A8 Output.

2. Set the signal generator to 3 GHz CW.

3. Connect a spectrum analyzer to the A6 Frac–N RF output at J4 of the A8

Output. The signal at J4 should be at 3 GHz and ≥0 dBm.

— If the signal is not present or at the correct level, replace the

Frac–N.

— If the signal is present, replace the A8 Output.

Do not re–install the A8 Output with the signal generator powered on. This can
cause serious damage to the signal generator.

2202 Switching Filter Test

— Replace the A8 Output.

2203 ALC Mod System Test

— Replace the A8 Output.

2204 Pulse Mod System Test

— Replace the A8 Output.

2205 RF Path Test

— Replace the A8 Output.

2206 Het Band Test

— Replace the A8 Output.

96 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

Self–Tests 24xx: A38 Lowband Filter Self–Test Errors

Before proceeding to the reported self–test error code, check the following
voltages. If any voltages are out of specification troubleshoot the supply
problem first.

Supply Voltage
(Vdc)

+32 P142–4 +31.04 +32.96 Main Supply

+15 P142–28 +14.55 +15.45 Main Supply

–15 P142–3 –15.45 –14.55 Main Supply

+5.2 P142–2, 27 +5.04 +5.36 Main Supply

–5.2 P142–1, 26 –5.30 –5.10 YIG Driver

+5.2 Digital High P141–64, 65, 129,

+3.4 Digital Low P141–60, 61, 62, 63,

+2.6 P141–57, 58, 59,

+1.8 P141–55, 56, 120,

Connector Pins Minimum Value

(Vdc)

+5.04 +5.36 Main Supply

130

+3.3 +3.5 Main Supply

125, 126, 127, 128

+2.52 +2.68 Main Supply

123, 124

–1.75 –1.85 Motherboard

121

Maximum Value
(Vdc)

Origin

E8257D/67D, E8663D PSG Signal Generators Service Guide 97

Troubleshooting
Troubleshooting Assembly–Level Problems

2400 Power Supply Test

— If the +15V and –15V power supplies are good in the above table, replace

the A38 Lowband Filter.

2401 RF Path Test

1. Remove the A38 Lowband Filter and insert a semi–rigid extender cable
into J3.

2. Connect the extender cable to a spectrum analyzer.

3. Tune the spectrum analyzer and signal generator to 2 GHz. Turn on the

signal generator’s RF.

4. You should see a high power signal (>+20 dBm) at 2 GHz on the spectrum
analyzer.

— If the signal is good, replace the A38 Lowband Filter.

— If the signal is troubleshoot the RF path.

2402 Lowband Amp/Filter Power Supply

— Replace the A38 Lowband Filter.

2403 RF Path

— Replace the A38 Lowband Filter.

Self–Tests 25xx: A43 Amp Filter Self–Test Errors

98 E8257D/67D, E8663D PSG Signal Generators Service Guide

Troubleshooting
Troubleshooting Assembly–Level Problems

Before proceeding to the reported self–test error code, check the following
voltages. If any voltages are out of specification troubleshoot the supply
problem first.

Supply Voltage
(Vdc)

+15 P142–28 +14.55 +15.45 Main Supply

–15 P142–3 –15.45 –14.55 Main Supply

+5.2 P142–2, 27 +5.04 +5.36 Main Supply

–5.2 P142–1, 26 –5.30 –5.10 YIG Driver

+5.2 Digital High P141–64, 65, 129,

+3.4 Digital Low P141–60, 61, 62, 63,

+10 P142, 10, 11, 36 +9.7 +10.3 Main Supply

Connector Pins Minimum Value

(Vdc)

+5.04 +5.36 Main Supply

130

+3.3 +3.5 Main Supply

125, 126, 127, 128

Maximum Value
(Vdc)

Origin

2500 Power Supply Test

— If the power supplies, in the table above, are good, replace the

A43 Amp Filter.

2501 RF Amp Test

— Replace the A43 Amp Filter.

2502 Filter Path Test

— Replace the A43 Amp Filter.

2503 Pulse Modulator Test

— Replace the A43 Amp Filter.

2504 Step Attenuator Test

— Replace the A43 Amp Filter.

2505 Divider On/Off Test

— Replace the A43 Amp Filter.

E8257D/67D, E8663D PSG Signal Generators Service Guide 99

Troubleshooting
Troubleshooting Assembly–Level Problems

Self–Tests 26xx: A8 Output Self–Test Errors

Before proceeding to the reported self–test error code, check the following
voltages. If any voltages are out of specification troubleshoot the supply
problem first.

Supply Voltage
(Vdc)

+15 P52–6, 21 +14.55 +15.45 Main Supply

–15 P52–2, 17 –15.45 –14.55 Main Supply

+5.2 P52–14, 29 +5.04 +5.36 Main Supply

+9 P52–5, 20 +8.82 +9.18 YIG Driver

–6 P52–3, 18 –6.12 –5.88 YIG Driver

Connector Pins Minimum Value

(Vdc)

Maximum Value
(Vdc)

Origin

2600 Power Supply Test

—Replace A8 Output.

100 E8257D/67D, E8663D PSG Signal Generators Service Guide