Agilent Technologies Agilent 4396B User manual

Agilent 4396B Network/Spectrum/Impedance Analyzer
Service Manual
SERIAL NUMBERS
This manual applies directly to instruments with serial
number prex JP1KD, or rmware revision 1.00.
For additional important information about serial
numbers, read \Serial Number" in Appendix A.
Agilent Part No. 04396-90121
Printed in Japan March 2001
Third Edition
Silicon Investigations
Repair Information - Contact Us
920-955-3693
www.siliconinvestigations.com

Notice
The information contained in this document is subject to change without notice
.
This document contains proprietary information that is protected by copyright. All rights are
reserved. No part of this document may be photocopied, reproduced, or translated to another
language without the prior written consent of the Agilent T
echnologies.
Agilent T
echnologies Japan, Ltd.
Component T
est PGU-Kobe
1-3-2, Murotani, Nishi-ku, Kobe-shi,
Hyogo
,651-2241 Japan
c
 Copyright Agilent Technologies Japan, Ltd. 1997, 2000, 2001

Manual Printing History
The manual's printing date and part number indicate its current edition. The printing date
changes when anew edition is printed. (Minor corrections and updates that are incorporated
at reprint do not cause the date to change.) The manual part number changes when extensive
technical changes are incorporated.
May 1997
::::
:::: :: :::::::::::::::::::
::
::
::
::::::::::
First Edition (part number: 04396-90121)
June 2000
:::::::: :: ::::::::::::::::::::: :: :: ::::::
Second Edition (part number: 04396-90121)
March 2001
::::::::::
::::::::::::::::::::::: :: :::::::
Third Edition (part number: 04396-90121)
iii

Safety Summary
The following general safety precautions must be observed during all phases of operation,
service
,and repair of this instrument. F
ailure to comply with these precautions or with specic
W
ARNINGS
elsewhere in this manual may impair the protection provided by the equipment.
In addition it violates safety standards of design, manufacture, and intended use of the
instrument.
The A
gilent T
echnologies assumes no liability for the customer's failure to comply with these
requirements
.
Note
4396B comply with INST
ALLA
TION CA
TEGORY II and POLLUTION DEGREE 2
in IEC1010-1. 4396B are INDOOR USE product.
Note
LEDs in 4396B are Class 1in accordance with IEC825-1.
CLASS 1LED PRODUCT
Ground The Instrument
To avoid electric shock hazard, the instrument chassis and cabinet must be connected to a
safety earth ground by the supplied power cable with earth blade
.
DO NOT Operate In An Explosive Atmosphere
Do not operate the instrument in the presence of ammable gasses or fumes
.Operation of any
electrical instrument in such an environment constitutes adenite safety hazard.
Keep Away From Live Circuits
Operating personnel must not remove instrument covers
.Component replacement and internal
adjustments must be made by qualied maintenance personnel. Do not replace components
with the power cable connected. Under certain conditions
,dangerous voltages may exist even
with the power cable removed. T
oavoid injuries
,always disconnect power and discharge
circuits before touching them.
DO NOT Service Or A
djust Alone
Do not attempt internal service or adjustment unless another person, capable of rendering rst
aid and resuscitation, is present.
DO NOT Substitute P
arts Or Modify Instrument
Because of the danger of introducing additional hazards
, do not install substitute parts or
perform unauthorized modications to the instrument. Return the instrument to a Agilent
T
echnologies Sales and Service Oce for service and repair to ensure that safety features are
maintained.
iv

Dangerous Procedure W
arnings
W
arnings
,such as the example below
,precede potentially dangerous procedures throughout
this manual. Instructions contained in the warnings must be followed.
W
arning
Dangerous voltages
, capable of causing death, are present in this
instrument. Use extreme caution when handling, testing, and adjusting
this instrument.
Safety Symbols
General denitions of safety symbols used on equipment or in manuals are listed below
.
Instruction manual symbol: the product is marked with this symbol when it is
necessary for the user to refer to the instruction manual.
Alternating current.
Direct current.
On (Supply).
O (Supply).
In position of push-button switch.
Out position of push-button switch.
Frame (or chassis) terminal. Aconnection to the frame (chassis) of the
equipment which normally include all exposed metal structures
.
This
Warning
sign denotes ahazard. It calls attention to aprocedure
,practice
,
condition or the like, which, if not correctly performed or adhered to
,could
result in injury or death to personnel.
This
Caution
sign denotes ahazard. It calls attention to aprocedure
,practice
,
condition or the like
,which, if not correctly performed or adhered to
,could
result in damage to or destruction of part or all of the product.
This
Note
sigh denotes important information. It calls attention to a
procedure, practice
, condition or the like
, which is essential to highlight.
Axed to product containing static sensitive devices use anti-static handling
procedures to prevent electrostatic discharge damage to component.
v

Certication
Agilent T
echnologies certies that this product met its published specications at the time
of shipment from the factory
.Agilent T
echnologies further certies that its calibration
measurements are traceable to the United States National Institute of Standards and
T
echnology
,to the extent allowed by the Institution's calibration facility
,orto the calibration
facilities of other International Standards Organization members.
W
arranty
This Agilent T
echnologies instrument product is warranted against defects in material and
workmanship for aperiod of one year from the date of shipment, except that in the case of
certain components listed in
General Information
of this manual, the warranty shall be for the
specied period. During the warranty period, Agilent Technologies will, at its option, either
repair or replace products that prove to be defective
.
F
or warranty service or repair
,this product must be returned to aservice facility designated by
Agilent Technologies
.Buyer
shall prepay shipping charges to Agilent T
echnologies and Agilent
T
echnologies shall pay shipping charges to return the product to Buyer
.However
,Buyer shall
pay all shipping charges
,duties
,and taxes for products returned to Agilent T
echnologies from
another country
.
Agilent T
echnologies warrants that its software and rmware designated by Agilent
T
echnologies for use with an instrument will execute its programming instruction when
property installed on that instrument. Agilent T
echnologies does not warrant that the operation
of the instrument, or software
,or rmware will be uninterrupted or error free
.
Limitation Of W
arranty
The foregoing warranty shall not apply to defects resulting from improper or inadequate
maintenance by Buyer
,Buyer-supplied software or interfacing, unauthorized modication or
misuse
,operation outside the environmental specications for the product, or improper site
preparation or maintenance
.
No other warranty is expressed or implied. A
gilent T
echnologies specically disclaims the
implied warranties of merchantability and tness for aparticular purpose
.
vi

Exclusive Remedies
The remedies provided herein are buyer's sole and exclusive remedies
.A
gilent T
echnologies
shall not be liable for any direct, indirect, special, incidental, or consequential damages,
whether based on contract, tort, or any other legal theory
.
Assistance
Product maintenance agreements and other customer assistance agreements are available for
Agilent T
echnologies products
.
F
or any assistance
,contact your nearest Agilent Technologies Sales and Service Oce
.
A
ddresses are provided at the back of this manual.
vii

Typeface Conventions
Bold
Boldface type is used when aterm is dened. F
or example:
icons are
symbols
.
Italics
Italic type is used for emphasis and for titles of manuals and other
publications
.
Italic type is also used for keyboard entries when aname or avariable
must be typed in place of the words in italics
.F
or example:
copy
lename
means to type the word
copy
,to type a space, and then to
type the name of ale such as
file1
.
Computer
Computer font is used for on-screen prompts and messages.
4
HARDKEYS
5
Labeled keys on the instrument front panel are enclosed in
45
.
NNNNNNNNNNNNNNNNNNNNNNNNNN
SOFTKEYS
Softkeys located to the right of the CRT are enclosed in
NNNNN
.
viii

Documentation Map
The following manuals are available for the analyzer
.
User's Guide
The User's Guide walks you through system setup and initial power-on, shows how to
make basic measurements, explains commonly used features
, and typical application
measurement examples
.After you receive your analyzer
,begin
with this manual.
T
ask Reference
T
ask Reference helps you to learn how to use the analyzer
.This manual provides simple
step-by-step instructions without concepts
.
Function Reference
The Function Reference describes all function accessed from the front panel keys and
softkeys
.It also provides information on options and accessories available
, specications
,
system performance
,and some topics about the analyzer's features.
Programming Guide
The Programming Guide shows how to write and use B
ASIC program to control the
analyzer and describes how HP Instrument B
ASIC works with the analyzer
..
GPIB Command Reference
The GPIB Command Reference provides asummary of all available GPIB commands
.It
also provides information on the status reporting structure and the trigger system (these
features conform to the SCPI standard).
HP Instrument B
ASIC Manual Set,
The HP Instrument B
ASIC User's Handbook introduces you to the HP Instrument B
ASIC
programming language
,provide some helpful hints on getting the most use from it, and
provide ageneral programming reference
.It is divided into three books
,
HP Instrument
B
ASIC Programming T
echniques
,
HP Instrument B
ASIC Interface T
echniques
,and
HP
Instrument B
ASIC Language R
eference
.
P
erformance T
est Manual
The P
erformance T
est Manual explains how to verify conformance to published
specications
.
Service Manual (Option 0B
W only),
The Service Manual explains how to adjust, troubleshoot, and repair the instrument.
This manual is option 0BW only
.
ix

Contents
1. General Information
INTRODUCTION ....................
..
..
.......1-1
ORGANIZATION OF SERVICE MANU
AL ...............
..
..
. 1-1
TABLE OF SERVICE TEST EQUIPMENT ...............
..
..
. 1-3
2. A
djustments and Correction Constants
Introduction ................
..
..
..
...........2-1
Safety Considerations ................. .. .. .......2-1
Required Equipment .................
..
..........2-2
W
arm-up for A
djustments and Correction Constants ..............2-2
Instrument Cover Removal . ..
.....................
.. 2-2
Order Of A
djustments ...............
..
..
.........2-2
Updating Correction Constants using the A
djustments Program .........2-3
A
djustments Program ..................
.........2-3
Keyboard and Mouse Operation ................... ...2-3
Controller Requirement ...................
..
.....2-4
Updating Correction Constants ............
...........2-5
40 MHz Reference Oscillator Frequency A
djustment ........
......2-6
Required Equipment ..............
..............2-6
Procedure ................
.................2-6
520 MHz Level A
djustment ............
..............2-8
Required Equipment ................. ...........2-8
Procedure ..........
....................... 2-8
CAL OUT Level A
djustment ...... ...................2-10
Required Equipment ....... .. .. .................2-10
Procedure ..........
..
..................... 2-10
Comb Generator A
djustment .....
..
..
................2-12
Required Equipment . .......................
..
.. 2-12
Procedure .... .. ................... .. .. .. ..2-12
Step Pretune Correction Constants . ..
.................
.. 2-15
Required Equipment ..................... .......2-15
Procedure . . . . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. 2-15
Second Local PLL Lock A
djustment.. .. .. .. .. .. .. .. ...... 2-16
Required Equipment . . . . . . . . . . . . . . . . . . . . . . ...... 2-16
Procedure . . . . . . . . . . . . . . . . . . . . . . . . ......... 2-16
DC Oset and Hold Step A
djustment ..................... 2-18
Required Equipment........................
.... 2-18
Procedure . ... .. .. . .. .. .. .. .. .. .. .. ........ 2-18
0

/90

Tracking A
djustment .... .. .. ................. 2-23
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
Band Pass Filters Adjustments ... .. . .. .. .. .. .. .. .. .. .. 2-26
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26
3 MHz Band Pass Filter Adjustment .. .. .. .. .. .. .. .. .. .. 2-26
1 MHz BPF Band Width Adjustment . . . . . . . . . . . . . . . . . . . . 2-27
Contents-1

Final Gain A
djustment . ..
............... .. .. .. .. .. 2-29
Required Equipment . .............
..
..
..
..
..
..
..2-29
Procedure ..
............... .. .. .. .. .. ......2-29
Source Mixer Local Leakage A
djustment ............
..
..
..
. 2-31
Required Equipment . ...............
..
..
..
..
..
..2-31
Procedure ..
................. .. .. .. .. ......2-31
RF OUT Level Correction Constants ............. .. .. .....2-33
Required Equipment ..............
..
..
..
........2-33
Procedure ................... .. ............2-33
Spectrum Analyzer Absolute Magnitude Correction Constants .........2-34
Required Equipment ................
..
..
........2-34
Procedure ............... .. ................2-34
Network Analyzer Absolute Magnitude Correction Constants .......... 2-35
Required Equipment ............
..
..
..
..........2-35
Procedure ............... .. .. ..............2-35
Crystal Filter Correction Constants ............
..
..
......2-36
Required Equipment ............
..
..
..
..........2-36
Procedure ............. ....................2-36
IF Gain Errors Correction Constants .....................2-37
Required Equipment ............................2-37
Procedure ............
..
..
.................2-37
Network Analyzer Magnitude Ratio/Phase Correction Constants .......
. 2-39
Required Equipment ....... .....................2-39
Procedure ......
..
......................... 2-39
10 MHz Reference Oscillator Frequency Adjustment (Option 1D5 Only) .....2-41
Required Equipment ............................2-41
Procedure ........
......................... 2-41
3. Troubleshooting
INTRODUCTION ..
.........................
....3-1
TROUBLESHOOTING SUMMARY . ..
....................3-1
ST
ART HERE ..
.......................
..
.....3-3
INSPECT THE POWER ON SEQUENCE ...............
..
...3-4
Check the F
an ................ .. .. ...........3-4
Check the Front P
anel LEDs and Displays ................ ..3-4
Check Error Message .................
..
..
.......3-4
OPERA
TOR'S CHECK .................
..
..
..
.....3-5
T
est Equipment ................... .. .. .......3-5
Procedure ........... .. .. .. .. .............. 3-5
INSPECT THE REAR P
ANEL FEA
TURE ...............
.....3-9
Check the GPIB Interface ......
................... 3-9
Check the P
arallel Interface ......
.. .. .. .. .. .. .. .. .. 3-9
Check the mini DIN Keyboard Connector .... .. .. .. .. .. .. .. 3-9
4. Isolate F
aulty Group Troubleshooting
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . .... .. .. . 4-1
OPERATOR'S CHECK F
AILURE TROUBLESHOOTING ... . .. .. .. .. . 4-2
Check RF OUT Frequency ......................... 4-2
Check RF OUT Power Level ........................ 4-2
PERFORMANCE TESTS FAILURE TROUBLESHOOTING .... .. .. .. .. 4-3
Perform Adjustments and Correction Constants .... . .. .. .. .. .. 4-3
Troubleshoot Suspicious Functional Group . . . . . . . . . . . . . . . . . . 4-4
Contents-2

5. Power Supply Troubleshooting
INTRODUCTION ..
............... .. .. .. .. .. ....5-1
ST
ART HERE ................. .. .. .. .. .......5-3
1. Check Error Messages .............. .. .. .. .. .. ..5-3
2. Check the F
an is Rotating ...........
..
..
..
..
..
...5-3
3. Check the A50 SHUTDOWN LED ............ .. .. .. .. . 5-3
A50 Shutdown LED ............... .. .. ........5-4
4. Check the A1 +5 VD LED .........
..
..
...........5-5
Measure the A1 +5 VD V
oltage ............. .. .......5-5
5. Check the A2 Eight LEDs ............
..
..
........5-5
6. Run the Internal T
est 4: A2 POST REGULA
TOR ......... .. ...5-6
Internal T
est 4: A2 POST REGULA
TOR ........
..
........5-7
FIND OUT WHY THE F
AN IS NOT ROT
A
TING ...
..
..
..
........5-8
1. Check the Line V
oltage
,Selector Switch Setting, and Fuse .... .. .. .5-8
2. Check the A50 SHUTDOWN LED .......... .. .. .......5-8
FIND OUT WHY THE A50 SHUTDOWN LED IS OFF .....
..
..
..
...5-9
1. Disconnect the Cable from the A50J1 .......
..
..
..
.....5-9
2. Disconnect the Cable from the A51J2 .....
..
...........5-9
3. Disconnect the Cable from the A1J10 ...........
.......5-9
4. Remove Assemblies ...........................5-9
FIND OUT WHY THE A1 +5 VD LED IS NOT ON STEADILY ..
..
......5-10
1. Check the A40 Pre-Regulator .......... .. .. ........5-10
2. Check the A50 DC-DC Converter . ..
..................5-10
3. Disconnect Cables on the A1 CPU ..
..................5-11
4. Remove Assemblies ....
..
.....................5-12
TROUBLESHOOT THE F
AN AND THE A50 DC-DC CONVERTER ........5-13
1. Troubleshoot the F
an ..........................5-13
2. Troubleshoot the A50 DC-DC Converter .................5-14
TROUBLESHOOT THE A2 POST-REGULA
TOR .................5-16
1. Check the A40 Pre-Regulator ...................... 5-16
2. Check the A50 DC-DC Converter .....................5-16
3. Remove Assemblies ..
.......................
.. 5-16
4. Measure the A2 P
ost Regulator Output V
oltages ..............5-16
6. Digital Control Troubleshooting
INTRODUCTION ..................... .. ........6-1
A1 CPU Replacement .................
..
..
..
.....6-3
FIRMW
ARE INST
ALLA
TION ...............
..
..
..
....6-4
Ordering the Firmware Diskette ......
..
..
..
..
..
......6-4
Installing the Firmware ...................
.......6-4
START HERE ............. .. .. .. .. .. .. .. .. . .. 6-6
1. Check the P
ower On Sequence . . . . .................. 6-6
Check the
4
Ch 1
5 and 4
Ch 2
5 Operations . . . . . . . . . . .... .. .. . 6-6
Check the A1 Eight LEDs ..................... .. . 6-6
2.CheckErrorMessages.. .. .. .. .. .. .. .. .. .. .. .. .. 6-7
Check the P
owerOnSelftest .................
...... 6-7
3. Check the A1 DRAM and Flash Memory ................
. 6-10
4. Check the A1 V
olatileMemory...................... 6-11
5. Check the A30 Front Keyboard ... . .. .. .. .. .. .. .. .. . 6-11
6. Check the A53 FDD . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
7. Check the A32 I-BASIC Interface and the mini DIN Keyboard .... .. . 6-12
TROUBLESHOOT THE A51 GSP and A52 LCD . . . . . . . . . . . . . . . . . 6-13
1. Run the Internal Test 3: A51 GSP .... .. .. .. .. . .. .. .. . 6-13
2. Check the A52 LCD(Liquid Crystal Display) . . . . . . . . . . . . . . . . 6-13
Contents-3

7. Source Group Troubleshooting
INTRODUCTION ..
...............
..
..
..
..
..
....7-1
SOURCE GROUP TROUBLESHOOTING SUMMARY ............ .. . 7-3
Start Here . ................. .. .. .. .. .......7-3
Check A5 Synthesizer Outputs .............. .. .. .. .. . 7-3
Check A4A1 1st LO Outputs .............
..
..
..
..
..
.7-3
Check an A3A1 ALC Output ...........
..
..
..
.......7-3
Check A3A2 2nd LO Outputs ............. ..
..
.......7-3
Check an A3A3 Source Output ............... .. ......7-4
Check A7 Output Attenuator Control Signals .............. .. 7-4
Check A60 High Stability Frequency Reference (Option 1D5) ......... 7-4
ST
ART HERE ...........
..
..
.................7-5
CHECK A5 SYNTHESIZER OUTPUTS ..........
..
..
..
.....7-7
1. Check the CAL OUT Signal ........
..
..
..
.........7-7
Check the CAL OUT's Spurious .........
..
..
..
.......7-8
2. Check the INT REF Signal ........
..
..
..
..........7-9
3. Check the FRA
CNOSC Signal ......
..
..
..
..........7-11
4. Check the STEP OSC Signal ........ ...............7-13
5. Check the 520 MHz Signal ............
............7-16
6. Check the EXT REF Operation ......................7-18
CHECK A4A1 1ST LO OUTPUTS .......... .. ...........7-19
1. Check the 1st LO OSC Signal at A4A1J3 ....
..
..
..
.......7-19
2. Check the 1st LO OSC Signal at A4A1J4 .................7-21
CHECK AN A3A1 ALC OUTPUT ..
..
...................7-23
1. Check the 21.42 MHz Signal . ..
....................7-23
CHECK A3A2 2ND LO OUTPUTS .......................7-26
1. Check the 2nd Local Oscillator Signal ..
................7-26
2. Check the 2.05858 GHz Signal .....................
.7-27
CHECK AN A3A3 SOURCE OUTPUT .....................7-30
1. Check the A3A3 RF Signal ......................
..7-30
CHECK A7 OUTPUT ATTENU
A
TOR CONTROL SIGNALS ............7-32
1. Check A7 Control Signals ....................... .7-32
CHECK THE A60 HIGH ST
ABILITY FREQUENCY REFERENCE .........7-34
8. Receiver Group Troubleshooting
INTRODUCTION ...................
..
..
........8-1
RECEIVER GROUP TROUBLESHOOTING SUMMARY ..............8-3
Start Here .................... .. .. .........8-3
Check A8 Output Attenuator Control Signals ...... .. .. .. .. ..8-3
Check A9 Input Multiplexer Control Signals ................
.8-3
Check Signal Inputs to A4A2 Receiver RF . . . .. .. .. .. .. .. .. . 8-3
START HERE ........
.. .. .. .. .. .. .. .. .. .. .. .. 8-4
CHECK A8 INPUT A
TTENUATOR CONTROL SIGNALS ............. 8-5
CHECK A9 INPUT MUL
TIPLEXER CONTROL SIGNALS . . . . . . . . . . . . . 8-7
CHECK SIGNAL INPUTS TO THE A4A2 RECEIVER RF . . . . . . . . . . . . . 8-9
Check the Input Signal to A4A2J3 ..................... 8-9
Check the Input Signal to A4A2J12 . . . . . . . . . . . . . . . . . . ... 8-9
Contents-4

9. Accessories Troubleshooting
INTRODUCTION ..
............... .. .. .. .. .. ....9-1
VERIFY OPERATIONS .............
..
..
..
..
..
..
...9-2
Using 75  Connectors with 50 Connectors ..........
..
..
.. 9-2
Large Spurious Signals in the Spectrum Measurement ............9-2
Odd Appearing Opens and Shorts in the Network Measurement ........9-2
INSPECT THE CONNECTORS ............... .. .. ......9-3
INSPECT THE A
CCESSORIES ............
..
..
..
.......9-4
V
erify the Probe P
ower .............. .. ..........9-4
Inspect the T
est Set ............... .. ...........9-5
Inspect the Calibration Kit ..............
..
..
.......9-5
V
erify Shorts and Opens .........
..
..
............9-5
10. Service K
ey Menus
INTRODUCTION ............... .. .. ............10-1
SERVICE MENU .............. .. .. .............10-3
NNNNNNNNNNNNNNNNN
TESTS
.........
..
....................... 10-3
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE MODES
(
:DIAG:SERV:MODE {ON|1}
)..... ...........10-3
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FIRMWARE REVISION
(
:DIAG:FREV?
)....................10-3
TESTS MENU ......................... .. .....10-4
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
EXECUTE TEST
( :DIAG:TEST:EXET
). ...................
.10-4
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
INTERNAL TESTS
(
:DIAG:TEST 0
)................. ....10-4
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
EXTERNAL TESTS
(
:DIAG:TEST 17
).........
..
..........10-5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ADJUSTMENT TESTS
(
:DIAG:TEST 41
)....................10-5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DISPLAY TESTS
(
:DIAG:TEST 48
).....................10-5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ALL EXT TESTS
(
:DIAG:TEST 53
)..................
...10-5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
MISC TESTS
(
:DIAG:TEST 58
).......................10-5
T
est Status ........
..
......................10-5
Diagnostic T
ests ........
..
....................10-6
T
est Descriptions ..
.......................
..
...10-7
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
INTERNAL TESTS
.....
...... .................10-7
0: ALL INT . .....................
..
..
.....10-7
1: A1 CPU ......................
..
..
.....10-7
2: A1 VOLA
TILE MEMORY ................... .. .. .10-7
3: A51 GSP . ..................... .. .. .. ...10-8
4: A2 POST REGULA
TOR . ..
...............
..
..
.. 10-8
5: A6 A/D CONVERTER .......................
..10-8
6: A5 REFERENCE OSC ..................... .. .. 10-8
7: A5 FRA
CTIONAL N OSC . . . . . . . . . . . . . . . .... .. .. . 10-8
8: A5 STEP OSC . . . . . . . . . . . . . . . . . . ........... 10-9
9: A4A1 1ST LO OSC ..................
........ 10-9
10: A3A2 2ND LO OSC . . . .. .. .. .. .. .. .. .. .. .. .. . 10-9
11: A3A1 DIVIDER .....
...................... 10-9
12: A6 3RD LO OSC .. .. .. .. .. .. .. .. .. .. .. .. .. . 10-9
13: A3A1 SOURCE OSC .... .. .. .. .. .. . .. .. .. .. .. 10-9
14: A6 3RD IF DC OFFSET . . . . . . . . . . . . . . . . . . . . . . . . 10-9
15: A6 SEQUENCER . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
16: A3A1 ALC .... .. .. .. . .. .. .. .. .. .. .. .. .. 10-9
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
EXTERNAL TESTS ............................ 10-9
17: FRONT PANEL DIAG. ........................ 10-12
18: DSK DR FAULTISOL'N........................ 10-12
19: POWER SWEEP LINEARITY ..................... 10-12
Contents-5

20: OUTPUT A
TTENUA
TOR . ............... .. .. .. .10-12
21: INPUT A
TTENU
A
TOR ............ .. ..
..
..
..
..10-13
22: RF TO SL
VL &FL
TNESS .......
...... .. .. .. ....10-13
23: STOACROSST
ALK ................ .. .. .. ...10-13
24: S INPUT COMPRESSION ..............
..
..
..
..
.10-13
25: S INPUT RESIDU
ALS ............... .. .. .. .. ..10-13
26: SINPUT NOISE LEVEL ............. .. .. ......10-13
27: FRA
CTION SPURIOUS .............. ..
..
......10-13
28: RF TO RL
VL &FL
TNESS ........... .. ..........10-14
29: NA CROSST
ALK &NOISE .............. .. ......10-14
30: RINPUT COMPRESSION ..............
..
.......10-14
31: RANGING .............. .. ..............10-14
32: A/R RA
TIO A
CCURA
CY .......
..
..
..
...........10-14
33: AINPUT COMPRESSION ............ .. .. .......10-14
34: B/R RA
TIO A
CCURA
CY .......
..
..
..
...........10-15
35: BINPUT COMPRESSION ............ .. .. .......10-15
36: RESOLUTION B
ANDWIDTH ..........
..
..
..
.....10-15
37: IF GAIN .........
..
....................10-15
38: PHASE NOISE ............................10-15
39: SPURIOUS ..............................10-15
40: X'T
AL FIL
TER RESPONSE .......
..
..
...........10-15
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ADJUSTMENT TESTS
...........
..
..
..
..........10-16
41: DC OFFST/HLD STEP ADJ ...
...................10-16
42: 0/90 DEG TRA
CKING ADJ .. ....................10-16
43: FINAL GAIN ADJ .... ......................10-16
44: 2nd LO PLL LOCK ADJ .......................10-16
45: SOURCE MIXER LEAK ADJ ....................
.10-16
46: 3MHZ BPF ADJ ...........................10-16
47: 1 MHZ BPF ADJ ......................
.....10-16
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DISPLAY TESTS
.........................
....10-16
48: TEST P
A
TTERN 1............
..
............10-16
49: TEST P
A
TTERN 2............
..
............10-17
50: TEST P
A
TTERN 3............
..
............10-17
51: TEST P
A
TTERN 4..
..
..
..
..................10-17
52: TEST P
A
TTERN 5....
..
..
..................10-17
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ALL EXT TESTS
.......
..
..
..................10-17
53: ALL EXT 1 . ..
...................
..
..
..
.10-17
54: ALL EXT 2 . ..
...................
..
..
..
.10-17
55: ALL EXT 3 . ..
.................
..
..
..
..
. 10-17
56: ALL EXT 4................... ..........10-17
57: ALL EXT 5 .. .. . .. .. .................... 10-17
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
MISC TESTS
......................... .. .. . 10-18
58: IMPED
ANCE TEST KIT . . . . . . . . . . . . . . . . . .... .. . 10-18
SERVICE MODES MENU . . . . . . . . . . . . . . . . . . . . .... .. . 10-19
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
BUS MEAS [OFF]
.... ......................... 10-19
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CORRECTION CONSTANTS
....................
...... 10-19
NNNNNNNN
IF ..........
..........................10-19
NNNNNNNNNNNNNNNNN
SYNTH .................................. 10-19
NNNNNNNNNNNNNNNNNNNN
SOURCE .................................. 10-20
Service Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
BUSMEASUREMENTMENU.. .. . .. .. .. .. .. .. .. .. .. .. 10-21
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
BUS MEAS on OFF ( :DIAG:SERV:BUS:STAT {ON|OFF} )............ 10-21
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DC BUS [OFF] ( :DIAG:SERV:BUS:DC < numeric > ).... . .. .. .. .. 10-21
Contents-6

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FREQ BUS [OFF]
(
:DIAG:SERV:BUS:FREQ
<
numeric
>
) . ..
..
..
..
.. 10-21
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
AZ SWITCH on OFF
(
:DIAG:SERV:BUS:AZER {OFF|ON|0|1}
). .... .. .. 10-22
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
WAIT COUNT
(
:DIAG:SERV:BUS:WAIT
..
..
..
..
..
..
........10-22
Bus Measurement ............
..
..
...... .......10-22
Bus Measurement Procedure ...........
..
..
..
..
..
...10-22
Bus Measurement V
alues ............
..
..
..
........10-23
DC Bus Node Descriptions .......... .. ..
...........10-23
0: NONE .............. .. ................10-23
1: +5 V(A
UX) (2.025 U) ......... .. ..............10-23
2:
0
15 V(
0
1.92 U) .......... .................10-23
3:
0
12.6 V(
0
2.124 U) ......
..
..
................10-23
4:
0
5V(
0
2.025 U) ..
..
....................... 10-24
5: +5 V(2.025 U) ....... .. .. .................10-24
6: +5.3 V(2.1465 U) .....
..
..
..
................10-24
7: +8.5 V(1.8955 U) .....
..
..
..
................10-24
8: +15 V(A
UX) (1.92 U) ..... .. .. ................10-24
9: +15 V(1.92 U) ..... ....................... 10-24
10: +22 V(2.002 U) .........
..................10-24
11: F
AN POWER .............................10-24
12: +65 V(2.0605 U) .. .. ..................... .10-25
13: SRC VTUNE (Source Oscillator VCO Tuning V
oltage) . .........10-25
14: 2ND LO VTUNE (Second Local Oscillator VCO Tuning V
oltage) .....10-25
15: DET OUT (Detector Output) ...................
.. 10-25
16: L
VL CONT (Level V
ernier Control V
oltage) ............... 10-26
17: D
A
COUT (Level D
A
COutput V
oltage) ..............
...10-26
18: 1ST LO VTUNE (First Local Oscillator V
CO Turning V
oltage) ......10-26
19: STEP VTUNE (Step Oscillator V
CO Turning V
oltage) ..........10-27
20: FN VTUNE (Fractional NOscillator V
CO Turning V
oltage) .......10-27
21: FN INTEG OUT (Fractional NOscillator Integrator Output V
oltage) ...10-28
22: REF VTUNE (Reference Oscillator V
CO Tuning V
oltage) ........10-29
23: 3RD LO VTUNE (Third Local Oscillator V
CO Tuning V
oltage) ......10-29
24: 2ND IF L
VL (Second IF Signal Level) ...........
..
....10-29
25: AD VREF (A/D Converter V
oltage Reference) .... .. .. .....10-29
26: GND (Ground) ........... .. ...............10-30
Frequency Bus Node Descriptions ........
..............10-30
0: OFF ..........
..
..
..
.................10-30
1: SOURCE OSC (Source Oscillator) .......
..
..
..
.......10-30
2: DIVIDER OUT (Divider Output) ....... .. .. .. .. .....10-30
3: STEP OSC (Step Oscillator) .........
.............10-30
4: FN OSC (Fractional N Oscillator) . . . . . . . . . . . . . ....... 10-30
5: REF OSC (Reference Oscillator) .. .. .. .. .. .. .. ...... 10-31
6: 3RD LO OSC (Third Local Oscillator) .... .. .. . .. .. ..... 10-31
7: SAMPLE HOLD . . . . . . . . . . . . . . . . . . . ......... 10-31
CORRECTION CONST
ANTS MENU .. .. .. .. .. .. .. .. .. .. .. 10-32
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FRQ RSP CC ON/off
( :DIAG:SERV:CCON:FRES {OFF|ON|0|1}
). . . . . . . . 10-32
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
XTAL CC ON/off
( :DIAG:SERV:CCON:XTAL {OFF|ON|0|1}
)......... 10-32
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
IF GAIN CC ON/off ( :DIAG:SERV:CCON:IFG {OFF|ON|0|1} ).... .. .. 10-33
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SOURCE CC ON/off ( :DIAG:SERV:CCON:SOUR {OFF|ON|0|1} ).... .. .. 10-33
Correction Constants . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-33
IF CONTROL MENU .... .. .. .. .. .. .. .. . .. .. .. .. .. 10-35
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
3rd LO [ ] ( :DIAG:SERV:IF:TLOC:MODE {AUTO|AC|DC} ).......... 10-36
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
IF BPF [ ] ( :DIAG:SERV:IF:BPF:MODE {AUTO|BW3M|BW1M|XTAL} )..... 10-36
Contents-7

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
IF GAIN []
........ .. .. .. .. .. ............. 10-36
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
IF RANGE []
..... .. .. .. .. .. .............
.. 10-37
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
IF LPF []
( :DIAG:SERV:IF:LPF:MODE
{AUTO|BW5K|BW15K|BW50K|BW150K|THR}
).
....
...........10-38
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
S/H BW []
( :DIAG:SERV:IF:SHBW:MODE {AUTO|NARR|MIDD|WIDE}
)..
..
.10-38
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
A/D MUX [ ]
(
:DIAG:SERV:IF:ADMX:MODE {AUTO|ALT|DEG0|DEG90}
) . ...10-39
SYNTHESIZER CONTROL MENU ............ .. .........10-40
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
1st LO OSC []
(
:DIAG:SYNT:FLOC:MODE {AUTO|SING|TRIP}
)....
..
.10-41
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FN OSC []
(
:DIAG:SERV:STNT:FN:MODE {AUTO|NARR|WIDE}
).... .. ..10-41
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
STEP OSC []
..... .. .. ...................
.. 10-41
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FREQUENCY OFFSET
( :DIAG:SERV:SYNT:FREQ:OFFS
< numeric
> )..
.....10-42
SOURCE CONTROL MENU ........... .. .. ...........10-43
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SOURCE AUTO man
(
:DIAG:SERV:SOUR:MODE {AUTO|MAN}
).....
..
..
.10-43
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ALC LOOP open CLOSE
(
:DIAG:SERV:SOUR:ALCL: {OPEN|CLOSE}
)...
..
.10-43
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
OUTPUT ATT []
(
:DIAG:SERV:SOUR:ATT
{AUTO|DB0|DB10|DB20|DB30|DB40|DB50|DB60}
).............10-43
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
LVL DAC AUTO man
(
:DIAG:SERV:SOUR:LEV:DAC:MODE {AUTO|MAN}
). .... 10-44
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
LVL DAC VALUE
( :DIAG:SERV:SOUR:LEV:DAC:VAL
< numeric
> ).......10-44
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
GAIN DAC AUTO man
(
:DIAG:SERV:SOUR:GAIN:DAC:MODE {AUTO|MAN}
)....10-44
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
GAIN DAC VALUE
(
:DIAG:SERV:SYNT:STEP:DAC:VAL
<
numeric
>
)......10-44
BOOTLO
ADER MENU ............................10-45
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SYSTEM UPDATE
..............................10-45
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SYSTEM BACKUP
....
..........................10-45
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PREVIEW DISK
........................
......10-46
NNNNNNNNNNNNNNNNNNNN
REBOOT
..................... .............10-46
11. Theory of Operation
ANAL
YZER OPERA
TION . ..
..................... .. .11-1
Spectrum Analyzer Operation .. .. ...................11-2
Network Analyzer Operation .. .. ....................11-2
T
est Sets .. .. .. ................... .. .. .. .11-3
ANAL
YZER FUNCTIONAL GROUPS . .. .. .................11-4
POWER SUPPLY OPERATION ..
..
.................
..
.. 11-5
Line P
ower Module . ............ ...... .........11-7
A40 Preregulator ............................ . 11-7
A50 DC-DC Converter ........................
... 11-7
Switching Regulator 1 ..........................11-7
Switching Regulator 2 .. .. .. . .. .. .. .. .. .. .. .. .. . 11-7
Regulated +5V Digital Supply (+5 VD) .... .. ............ 11-7
A50 Shutdown LED ............... .. .. .. .. .. .. 11-7
A2 P
ost-Regulator .... .. .. .. .. .. .. .. .. .. .. .. .. . 11-8
Shutdown Circuit .... .. .. .. .. . ............... 11-8
Seven Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-8
A7 Input and A8 Output Attenuator Drive Circuit . . . . . . . . . . . . . 11-9
DIGITAL CONTROL OPERATION . .. .. .. .. . .. .. .. .. .. .. . 11-10
A1CPU...... .. .. .. .. .. .. .. .. . .. .. .. .. .. . 11-12
A30 Front-Panel Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . 11-12
A31 I/O Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12
A32 I-BASIC Interface .. .. .. .. .. .. .. .. .. .. .. . .. .. 11-12
Contents-8

A51 GSP ..... .............
..
..
..
..
..
..
...11-13
A54 Inverter . ............. .. .. .. .. .. .. .....11-13
A52 LCD (Liquid Crystal Display) ............. .. .. .. .. .11-13
A53 FDD .................. .. .. .. .. .......11-13
SOURCE THEORY . ................. .. .. .. .. ....11-14
A5 Synthesizer . ............... .. .. .. .. .. ....11-16
REF OSC ..............
..
..
..
............11-16
Leveler ................. .. .. ............11-16
FRA
CNOSC ................
..
............11-16
STEP OSC .................. .. ............11-17
Multiplier (X 13) ................. .. ..........11-18
A4A1 1st LO ...........
..
..
................11-18
1st Local OSC Circuit ..........
..
..
..
...........11-18
Single-Loop Operation at Frequency Spans
>
45 MHz ......
..
.. 11-19
Triple-Loop Operation at Frequency Spans

45 MHz ........ .. 11-19
Digital Control Signals for the A4A2 Receiver RF ......
..
..
..
.11-19
A3A1 ALC ............
..
..
..
..............11-19
Divider ............. ....................11-19
Source OSC ...............................11-19
ALC ..................................11-20
A3A2 2nd LO ............ .. .................11-20
2nd Local OSC Circuit .........
..
..
..
...........11-20
Source First Mixer ...... ...................... 11-21
A3A3 Source .....
..
.......................
. 11-21
A7 Output Attenuator ...... .....................11-21
RECEIVER THEORY .............................11-23
A8 Input Attenuator ......
......................11-25
A9 Input Multiplexer ............................11-25
A4A2 Receiver RF .........................
....11-25
A6 Receiver IF ......................... .....11-26
IF BPFs and LPFs . .......................
..
..11-26
3rd Converter and 3rd LO .......................
.11-27
Sample/Hold, A/D Converter
,andSequencer ................11-27
Gains W
,X, Y
,and Zand Ranges Fand R....... .. .. ......11-27
12. Replaceable P
arts
Introduction ..................... .. .. ........12-1
Ordering Information .................... .. .. ....12-1
Direct Mail Order System ........ .. .. .. .. ..........12-1
Exchange Assemblies ....................
........12-2
Replaceable P
arts List ......
... . .. .. .. .. .. .. .. .. .. 12-2
13. Post Repair Procedures
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . .... .. .. .. 13-1
POST REP
AIR PROCEDURES . . . . . . . . . . . . . . . . . . .... .. . 13-1
Contents-9

A. Manual Changes
Introduction ..
.............
..
..
..
..
..
..
......A
-1
Manual Changes . ............... .. .. .. .. .. .....A
-1
Serial Number . ............... .. .. .. .. .. ......A
-2
B
.A20 Motherboard Pin Assignment
C. P
ower Requirement
Replacing Fuse ..
.....................
..
..
..C-1
Fuse Selection ....................
..
..
.......C-1
P
ower Requirements ...................
..
..
..
....C-2
P
ower Cable ...................
..
..
..
.......C-2
Messages
Error Messages in Alphabetical Order ............... .. .. ..
Messages-1
Error Messages in Numerical Order ................. .. ...
Messages-9
Index
Contents-10