Notice
Hewlett-Packard to Agilent Technologies Transition
This documentation supports a product that previously shipped under the HewlettPackard company brand name. The brand name has now been changed to Agilent
Technologies. The two products are functionally identical, only our name has changed. The
document still includes references to Hewlett-Packard products, some of which have been
transitioned to Agilent Technologies.
Printed in USA March 2000
Contacting Agilent
By internet, phone, or fax, get assistance with all your test and measurement needs.
Table 1-1 Contacting Agilent
Online assistance: www.agilent.com/find/assist
United States
(tel) 1 800 452 4844
New Zealand
(tel) 0 800 738 378
(fax) (+64) 4 495 8950
Latin America
(tel) (305) 269 7500
(fax) (305) 269 7599
Japan
(tel) (+81) 426 56 7832
(fax) (+81) 426 56 7840
Canada
(tel) 1 877 894 4414
(fax) (905) 282-6495
Australia
(tel) 1 800 629 485
(fax) (+61)3 9210 5947
Asia Call Center Numbers
Country Phone Number Fax Number
Singapore 1-800-375-8100 (65) 836-0252
Malaysia 1-800-828-848 1-800-801664
Philippines (632) 8426802
1-800-16510170 (PLDT
Subscriber Only)
Thailand (088) 226-008 (outside Bangkok)
(662) 661-3999 (within Bangkok)
Hong Kong 800-930-871 (852) 2506 9233
Taiwan 0800-047-866 (886) 2 25456723
People’s Republic
of China
800-810-0189 (preferred)
10800-650-0021
(632) 8426809
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Subscriber Only)
(66) 1-661-3714
10800-650-0121
Europe
(tel) (+31) 20 547 2323
(fax) (+31)20 547 2390
India 1-600-11-2929 000-800-650-1101
Service Guide
This
HP
manual
83711A/12A
Synthesized
SERIAL
applies
directly
to
instruments
and
CW
NUMBERS
with
HP
Generators
serial number
83711B/12B
prex US3449
and
above
.
ABCDE
HP Part No. 83711-90134
Printed in USA July 1997 Supersedes April 1995
Notice.
The
information contained
in this
document
is
subject
to
change
without
notice
.
Hewlett-P
but
purpose
ackard makes
not limited
.
Hewlett-P
consequential
to,
the implied
ackard
damages
no warranty
warranties
shall
not
in
connection
be
of
liable
with
any
kind
of
merchantability
for
errors
the
furnishing,
with
regard
to
and
contained
performance
this
tness
herein
material,
for
or
for
,
or
use
including
a
particular
incidental
of
this
or
material.
c
Copyright Hewlett-Packard Company 1995, 1997
All Rights Reserved. Reproduction, adaptation, or translation without prior written permission
is prohibited, except as allowed under the copyright laws.
1400 Fountaingrove Parkway, Santa Rosa CA, 95403-1799, USA
Introduction
The
HP
83711A/12A
ranges
.
The
HP
83711A/11B
a
frequency
The
service
comes
The
HP
information
HP
83711B/12B
range
information
in
two
manuals
83711A/12A
needed
,
HP
Component-Level
individual
(CLIP
parts
s)
list,
for
instrument
selected
and
illustrations
and
HP
of
10
MHz
for
the
.
and
HP
to
repair
83731A/32A
Information
assemblies
assemblies.
for component
83711B/12B
has
a
frequency
to
20
GHz.
HP
83711A/12A
83711B/12B
the
synthesizer
and
HP
manual
.
The manual
Each CLIP
synthesized CW
range of
and
Synthesized
to
the
83731B/32B
provides
component-level
generators have
1to
HP
83711B/12B
CW
assembly level.
Synthesized Signal
contains Component-Level
contains component-level
location by
reference designator
dierent frequency
20 GHz,
and the
synthesized CW
Generators Service
The
HP
Generators
information
Information P
schematics,
.
HP 83712A/12B
generators
Guide
provides
83711A/12A,
for
the
repair of
ackets
a
component
has
Calibration
HP
83731B/32B
contains
The
the
service
information
Synthesized
performance
guide
is
what
is
in
the
Signal
tests
you
HP
83711A/12A, HP
Generators
and
adjustments
receive
when
Calibration
for
you
order
83711B/12B,
Guide
the
synthesizer
Option
HP 83731A/32A
.
The calibration
.
OBW
,
service
and
guide
documentation.
iii
In
The
This
service
Guide
guide
includes
the
following
chapters:
Chapter
failed
Chapter
1
major
2
,
,
83711A/12A
Chapter
3
,
assemblies
Chapter
4
,
instrument.
Chapter
major
Chapter
been
Chapter
5
,
assembly
6
,
made
7
,
generated
followed
Chapter
to recover
8
,
synthesizers
Chapter
as
Chapter
updates
etc
how
.
9
,
to
package
10
,
operating
\Troubleshooting,"
assembly
\Block
and
\Major
and
\P
arts
\Assembly
Diagrams
HP
Assembly
cable
List,"
.
83731B/32B
locations
contains
Replacement," contains
.
\P
ost-Repair Procedures
.
\Error
during
\Options
Messages
use
of
from
,"
contains
the
the
.
\Contacting
\Legal
and
and
Hewlett-P
ship
Regulatory
environment,
contains
,"
contains the
.
and
Cable
.
information
," contains
,"
contains
instrument.
error
condition.
a
description
ackard,"
the
instrument.
Information,"
storage
the
troubleshooting
block diagram
Locations
needed to
information needed
the procedures
a
list
of
all
Each
entry
of
the
provides
environment,
," contains
order assemblies
of
the
error
in
the
various
information
contains
ESD
information
that is
to be
drawings that
to remove
to be
messages
list
contains
options
on
the
information
precautions
needed to
used
and parts
followed
that
a
sequence
available
how
to
about
,
safety
isolate a
for
the
show the
or replace
after
a
might
be
that
for
use with
contact
HP
manual
considerations,
HP
major
for the
repair
can
as
a
has
be
the
well
Assumptions
The procedures
service task.
containing the
in this
To
nd what
task.
iv
About
guide
tools
Y
ou
assume
and
that
you
equipment
have
belong
the
tools
to
each
and
equipment
service
task,
to
perform
refer
to
the
each
chapter
Contents
1. Troubleshooting
Introduction .
Prior to
Safety Considerations
W
arnings
Before
After-Service
ESD
Recommended
Service A
TORX
Pozidrive
Hardware .
Major Assemblies
Test
Service
Other
Cleaning
Cleaning
Cleaning
12-Month
After
Main
Microprocessor
LO
YO Loop and Oset Synthesizer Assembly (A7) Troubleshooting . . . . . . . .
YIG Driver
ALC Assembly (A10) Troubleshooting . . . . . . . . . . . . . . . . . . . . 1-25
Beginning Troubleshooting
The Service
Power
ABUS
0.5
Data
ABUS
Oscillator Cold Error . . . . . . . . . . .
LO Synthesizer and Reference Unlocked/Divide V
Data Readback Errors
ABUS
Oset
Data Readback Errors
ABUS Errors ...... ...... ...... ..... ...... . 1-20
MSB Errors ...... ...... ...... ...... ..... .. 1-21
Low/High Band Voltage Errors ...................... 1-23
Data Readback Errors .... ...... ...... ...... .... 1-25
ABUS Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
DAC Errors ............................... 1-26
Supply V
Applying
Precautions
ccessories
R
Screwdrivers .
P
oint
Aids
Service
.
Intervals
Solution
Repair
Troubleshooting
Errors
V/GHz
Synthesizer
Readback Errors
Errors
Error........................
Synthesizer Incorrect Frequency/Unlocked Errors . . . . . . . . . .
.
.
.
.
.
.
.
.
.
.
.
.
.
Position
and
Cautions
P
Safety
.
T
est
Screwdrivers
.
.
,
Locations
on
Printed
Documents
.
.
.
Cleaning
Calibration
Assembly
Output
and
Assembly (A9) Troubleshooting
.
.
.
.
.
erication
..
ower
Checks
.
.
.
Equipment
.
.
.
.
.
P
arts
,
.
.
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.
.
Errors .
Reference Assembly
.
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and
Cable
.
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.
Circuit
.
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.
Boards
.
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(A3)
Troubleshooting
.
.
.
.
..
..
..
.
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.
.... ...... ...... ......
.... .....
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Locations
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(A6) Troubleshooting
..
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...... ...... ....
oltage Errors
...... ...... .....
.................
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......
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..
. 1-4
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. 1-10
.
.
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.
..
. 1-11
.
.
.
.
. 1-13
....
1-1
1-1
1-1
1-1
1-2
1-2
1-2
1-3
1-3
1-3
1-4
1-4
1-4
1-4
1-4
1-5
1-5
1-5
1-5
1-5
1-5
1-6
1-7
1-9
1-9
1-11
1-11
1-12
1-16
1-16
1-17
1-18
1-20
1-20
Contents-1
Integrator
Integrator
Leveled
Leveled
RF/Reference
Input/Output
Input/Output
Track
Track
Output
Combiner/High
SLPF
A
Input/Output
Y
O
Loop
Sampler
LO
Unlocked
Oset
Y
O
Loop
SLPF
A
Unleveled
Unleveled
Divider
Symptom
Checking
Checking
Checking
Checking
Checking
Checking
Checking
Checking
T
o
Troubleshoot
T
o
Troubleshoot
Checking
Errors .
Errors (Revision
Indicator Trip
Indicator Trip
Detector Errors
Switching Errors
Switching
and
Hold
Errors
and
Hold
Errors
Module
(A8A3)
(A8T1)
Synthesizer
(A8A3)
and
Troubleshooting
(A8A1)
Band/Low
Troubleshooting
Bias
and
Oset
Unlocked
at
at
Modulation
the
P
the
Front
the
Hewlett-P
the
Microprocessor
the
10
the
10
the
0.5V/GHz
the
Output
External ALC
Synthesizer
Troubleshooting
Errors
Troubleshooting
Minimum
Maximum
ower
P
MHz
MHz
the
the
Errors
Unlocked
Supply
..
..
..
10.01 and
Point
Errors
Point
Errors
Errors
.
(Revision
Troubleshooting
.
.
Errors
V
ernier
V
Assembly
.
anel
Display
ackard
Output .
Input
Output
P
ath
Option
Non-Option
.
(Revision
.
.
.
Band
.
.
.
.
Assembly
.
.
.
Errors
.
.
.
Errors
ernier
.
.
.
.
.
Interface
.
.
.
..
.
.
..
..
1E1 Output
.
.
.
.
.
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Above
.
.
(Revision
..
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..
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10.01
and
.
Errors
.
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(A7)
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Errors
(A4)
Troubleshooting
.
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Bus
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Path
1E1 Output
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Only)
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10.01
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10.01
and
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Above
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(HP-IB)
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Only)
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Troubleshooting
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Path
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and
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Above
..
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Above
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Only)
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Only)
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..
1-27
1-27
1-27
.
1-27
. 1-27
. 1-29
.
1-29
.
1-29
. 1-29
. 1-30
1-30
.
1-31
.
1-31
. 1-34
.
1-41
.
1-41
.
1-42
.
1-42
.
1-50
.
1-50
.
1-51
1-52
.
1-56
.
1-57
.
1-57
.
1-58
.
1-58
.
1-59
.
1-59
.
1-60
.
1-60
.
1-60
.
1-61
.
1-62
2.
Block Diagrams
3.
Major
Introduction
4. Parts List
Introduction..........
Abbreviations . . . . . . . . . . . . . . . . . . . .
Replaceable P
Illustrated P
Ordering Information
Optional Congurations
Parts List Backdating
Parts Identication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Other Documentation .. ...... ...... ...... ..... ... 4-4
Exchange Assemblies . ...... ..... ...... ...... .... 4-5
Contents-2
Assembly
and
Cable
.
.
.
.
.
arts T
able F
arts Breakdowns . . . . . . . . . . . . . . . . . .
Locations
.
.
.
.
.
.
..
..
..
..
..
.... ...... ...... ...... .
ormat........ ...... .
...... ..... ...... ....
...... ...... ..... .....
.....................
..
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.
.
.
.
...... ..... .
.........
...... .
...... .
.....
..... ..
.
.
.
3-1
4-1
4-1
4-1
4-2
4-2
4-3
4-3
5.
Assembly Replacement
Introduction
Assembly
Major
Service
T
ools .
Special
Safety
F
asteners
Cable
Semi-Rigid
Flexible
SMC
SMA
SMB
Multi-wire
Synthesizer
T
o
Remove
T
o
Remove
P
ower
T
o
Disconnect
T
o
Remove
Reassembly
Fuse
T
o
Remove
F
an
Assembly
T
o
Disconnect
T
o
Remove
Reassembly
Divider
T
o
A
ccess
T
o
Remove
Reassembly
Microprocessor
T
oA
ccess
T
o Disconnect
T
o Remove
Reassembly
Battery
T
o
A
ccess
To Remove the P
To Reassemble the Instrument
Crystal Oscillator (Option 1E5)
To Disconnect the Oscillator Cables
To Remove the Oscillator . . . . . . . . . . . . . . . . .
Reassembly Tips . . . . . . . . . . . . . . . . . . . . .
ALC Board Assembly (A10) . . . . . . . . . . . . . . . . . . . .
To Remove the Assembly . . . . . . . . . . . . . . . . . . . .
Reassembly Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-33
YIG Driver Board Assembly (A9) .......... ...... ...... . 5-35
ToAccess the Service Position ...... ...... ...... ..... 5-35
To Remove the Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . 5-36
YO (YIG Oscillator) Loop/Oset Synthesizer Board Assembly (A7) . . . . . . . . 5-38
To Remove the Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . 5-38
Reassembly Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-38
..
and P
art Locations
Assembly and
Position
..
.
T
echniques
.
.
.
.
(Screws
and
Connector
Coaxial
Coaxial
Connectors
Connectors
Connectors
Cables
Covers
the
the
Supply
.
and
(A3BT1)
(A11)
the
the
Tips
.
.
.
.
(and
.
the
the
Tips
Modulation
the
Service P
the
Tips
Board Assembly
the
Service
the
the Microprocessor
Tips .
the
Service
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Cable Locations
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and
Nuts)
Identication
Cables
Cables
T
op
Bottom
P
ower
.
Replace)
.
Fan
Assembly
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art ....
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Cover
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P
ower
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an
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Cover
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Supply
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the
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Cable
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Board
osition .
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P
osition
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osition
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Fuse
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Assembly
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(A3)
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Assembly
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5-1
5-7
. 5-7
.
5-7
.
5-7
.
5-9
.
5-9
.
5-9
.
5-9
.
5-10
.
5-11
.
5-11
.
5-11
.
5-11
.
5-11
.
5-13
.
5-13
.
5-15
.
5-17
.
5-17
.
5-18
.
5-19
. 5-20
.
5-20
.
5-21
.
5-21
.
5-22
5-23
.
5-23
. 5-23
. 5-23
5-24
. 5-26
.
5-26
.
5-26
5-27
.
5-27
.
5-29
.
5-29
5-29
5-30
5-31
5-31
5-31
5-32
5-33
5-33
Contents-3
LO
(Local Oscillator)
T
oA
ccess the
T
o Remove
Reassembly
Step
Attenuator,
T
o Remove
T
o
Reassemble
Sampler
T
T
YIG
T
T
YIG
T
T
Output
T
T
T
T
RF
T
T
HP-IB
T
Reassembly
Front
T
T
T
T
T
T
Reassembly
Microcircuit,
o
Remove
o
Reassemble
Oscillator(s)
o
Remove
o
Reassemble
Driver
o
Remove
o
Reassemble
Module
o
Remove
o
Remove
o
Remove
o
Reassemble
Output
o
o
o
o
o
o
o
o
o Remove
Connector/A
Remove
Reassemble
Cable
Remove
P
anel
Remove
Remove
Remove
Remove
Remove
Synthesizer/ Reference
Service
the Assembly
Tips .
A8AT1
the Assembly
the
Instrument
the
Subassembly
the
Instrument
.
.
the
P
art
the
Instrument
Cable
and
the
P
art
the
Instrument
,
SLPF
A
the
Subassemblies
the
Coupler
the
Output
the
Instrument
the
Assembly
the
Instrument
Interface
the
Assembly
Tips
.
(A1,
A2) .
the
Front
the
ALC
the
Front
the
Display
the
Keyboard
the
Dress
Tips .
P
osition
..
.
(Option
A8T1
.
.
.
.
.
T
emperature
.
.
Module
Detector
Module
dapter
Replacement
.
.
.
.
.
Panel
Cable/Connector .
Frame .
(A2) .
(A1) .
P
anel
.
.
.
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1E1)
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Transducer
.
.
.
.
.
.
.
,
and
Coupler
.
.
Subassembly
and
the
.
.
,
CP1
.
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Board Assembly
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Detector
.
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SLPF
A
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Module
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Subassemblies
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(A6) .
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5-40
.
5-40
.
5-41
.
5-42
5-44
.
5-44
.
5-44
.
5-46
.
5-46
.
5-48
.
5-49
.
5-49
.
5-50
.
5-53
.
5-53
.
5-54
.
5-55
.
5-55
.
5-56
.
5-58
.
5-58
.
5-60
.
5-60
.
5-62
.
5-64
.
5-64
.
5-65
.
5-66
5-66
.
5-66
.
5-68
.
5-69
.
5-69
.
5-69
.
5-71
6.
Post-Repair
Introduction
7.
Error
Introduction . . . . . . . . .
Error Messages List
Messages ...........
8. Options
Introduction......................
Electrical Options
Mechanical Options ........ ...... ...... ...... ... 8-3
Contents-4
Messages
Option 1E1 - A
Option 1E5 - Add High Stability Timebase . . . . . . . . . . . . . . . . . . 8-2
Option 1E8 - 1 Hz Frequency Resolution .................. 8-2
Option 1E9 - 3.5 mm RF Output Connector ................. 8-2
Option 1CM - Rack Mount Kit . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Option 1CP - Rack Mount and Handle Kit .................. 8-3
Option 1CR - Rack Slide Kit .... ...... ...... ...... .. 8-3
Procedures
..
..
.
.
.
.
.
.
.
.
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.
.
..
..
..
........................
...... ..
......................
dd Output Step Attenuator . . . . . . . . . . . . . . . . .
...... ...... ...... ...
.......................
...... .....
........
..
.
.
.
.
6-1
7-1
7-2
7-3
8-1
8-2
. 8-2
W
arranty Options
Option
Option
Documentation
Option
Option
Option
Option
Option
9.
Contacting
Introduction
Returning
Service
Original
Other
Sales
10.
Legal
Introduction
Safety
Before
Safety
Safety
Electrostatic
PC
T
ESD
Certication
W
arranty
Limitation
Exclusive
Assistance
W30 -
W32 -
OB0 -
OB1 -
OBV
OBW
OBX
Documentation
Hewlett-P
.
Instruments
T
ag
P
ackaging
P
ackaging
and
Service
and
Regulatory
.
Considerations
Applying
Earth
Symbols
Discharge
Board
est
Assemblies
Equipment
A
ccessories
.
.
.
of
Remedies
..
..
..
..
Two A
Three Y
Options .
Delete Operating
Extra Operating
-
-
-
.
.
.
Ground
.
.
W
.
dditional
ear
Return
..
Component-Level
Service
Component-Level
.
.
Oces
.
and
.
..
arranty
.
Documentation
.
.
.
ackard
.
.
.
.
for
Service
.
.
.
.
.
.
.
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.
.
Information
.
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P
ower
.
.
Notes
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and
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Calibration
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Documentation
Documentation
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Information
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. 8-3
. 8-3
. 8-3
. 8-4
8-4
8-4
8-4
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8-4
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8-4
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9-1
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9-2
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9-2
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9-2
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9-2
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9-3
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10-1
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10-2
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10-2
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10-2
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10-3
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10-4
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10-4
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10-5
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10-5
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10-6
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10-6
. 10-6
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10-6
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10-6
Index
Contents-5
Figures
2. HP
3-1. Major
3-2. Major
3-3. Cable
3-4. Cable
4-1. Major
4-2. Major
4-3. Cable
4-4.
4-5.
4-6.
4-7. T
4-8. Front
4-9.
4-10.
4-11.
4-12.
4-13.
4-14.
4-15.
4-16.
5-1.
5-2.
5-3.
5-4.
5-5.
5-6.
5-7.
5-8.
5-9.
5-10.
5-11. F
5-12. F
5-13. Divider and Modulation Board Assembly Removal
5-14. Microprocessor Board Assembly Cable Location
5-15. Microprocessor Board Assembly Removal
5-16. Microprocessor Board Battery Removal
5-17. Crystal Oscillator Cables
5-18. Crystal Oscillator Removal
5-19. ALC Board Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-34
5-20. YIG Driver Board Service Position ..................... 5-35
5-21. YIG Driver Board Removal . . . . . . . . . . . . . . . . . . . . . . . . . 5-37
5-22. YO Loop and Oset Synthesizer Board Removal ...... ...... ... 5-39
5-23. LO Synthesizer and Reference Board Service Position .... ...... .. 5-41
5-24. LO Synthesizer and Reference Board Removal . . . . . . . . . . . . . . . . 5-43
5-25. Step Attenuator Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-45
83731A/B,
Assemblies {
Assemblies {
Assemblies {
Assemblies {
Assemblies
Assemblies
Assemblies
Cable
Assemblies
Figures
Figures
op and
Front
Front
T
op Side
F
an,
YIG,
Attenuator
Microwave
Microwave
Location
Location
Cable
Cable
T
op
Service
Service
P
ower
P
ower
Line
an Cable Location
an Assembly Removal .
Orientation
Orientation
Panel
Frame and
Dress P
P
ower
Crystal
Locations{T
Locations{Bottom
or
Bottom
P
P
Supply
Supply
Fuse
HP
83732A/B
T
Bottom
Top
Bottom View
Location
Location
Location
Location
Diagram,
Diagram,
Bottom Cover
Illustrated P
Display/Keyboard Illustrated
anel Illustrated
Circuit Board
Supply
,
Output
Deck
of
Major
of
Major
osition{T
osition{Bottom
Removal
,
and
Oscillator
Bottom
Side
and
Illustrated
Assemblies{T
Assemblies{Bottom
op
Cover
op
Cables
Screws
and
Overall
op
View
View
View
Diagram
Diagram
Diagram
Diagram
T
Bottom
Illustrated
arts Breakdown
P
Illustrated
Rear
P
,
and
Sampler
Circuit
SLPF
A
P
arts
View
Removal
Cover
................
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View
Removed
Cover
.
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Replacement
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................
Block
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(T
op
(Bottom
(T
op
(Bottom
op
View
View
P
arts
arts
Breakdown
P
arts
anel
Connector
Microcircuit
Board,
Illustrated
Breakdown
op
View
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Removed
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Diagram
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View)
View)
View)
View)
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Breakdown
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Breakdown
and
Rails
P
arts
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View
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oldout
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P
arts
Breakdown
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Illustrated
Illustrated
Illustrated
Breakdown
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P
arts
Breakdown
P
arts
Breakdown
P
arts
Breakdown
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. 3-3
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. 3-5
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. 4-20
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. 5-18
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. 5-22
2-3
3-2
3-4
4-8
4-10
4-12
4-14
4-15
4-16
4-18
4-22
4-24
4-26
4-28
4-30
4-32
4-34
4-36
5-3
5-4
5-5
5-6
5-12
5-14
5-16
5-19
5-20
5-21
5-25
5-27
5-28
5-30
5-31
5-32
Contents-6
5-26.
Sampler Removal
5-27.
YIG Oscillator
5-28.
Output Module
5-29.
Output Module
5-30.
RF Output
5-31.
RF Output
5-32.
HP-IB
5-33.
Front
5-34.
Front
5-35.
Display
5-36.
Dress
10-1.
Static-Safe
..
..
..
Removal .
, SLPF
, SLPF
A
Module
A
Module
.
.
Connector Removal{Standard
Connector Removal{Option
Cable
P
anel
Frame
and
P
anel
Removal
and
BNC
Removal
Keyboard
Removal
W
orkstation
.
.
.
Connector
.
.
.
Removal
.
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,
and
,
and
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.
Removal
.
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Coupler
Coupler
1E1
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Detector
Detector
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Removal
Separation
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. 5-57
. 5-61
. 5-62
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5-46
5-51
5-56
5-64
5-67
5-68
5-70
5-71
10-4
Contents-7
T
ables
1-1. Recommended
1-2. YIG
1-5. A2J1
4-1. P
4-2. Reference
4-3. Abbreviations
4-4. Multipliers
4-5.
4-6.
4-7.
4-8.
4-9.
5-1. T
5-2. F
9-1. Hewlett-P
Continuity
V
oltages
art Numbers
Major
Major
Cable
Cable
Illustrated
Assemblies
Assemblies
Assemblies
Assemblies
ools .
astener T
.
Designations .
Replaceable
.
orque
ackard
Test
.
for
..
..
.
.
V
Equipment .
.
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.
Exchange
.
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.
.
,
T
op
View
,
Bottom
,
T
op
View
,
Bottom
P
arts .
.
.
.
.
alues
.
Sales
and
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Assemblies
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View
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View
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Service
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Oces
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. 1-6
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1-39
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1-57
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4-6
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4-6
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4-7
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4-8
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4-9
.
4-11
.
4-13
.
4-17
.
5-8
.
5-9
9-4
Contents-8
Troubleshooting
Introduction
This
chapter
Always
start
of
on
the
detected
can
have
procedures
These
procedures
contains
begin
troubleshooting
the
main troubleshooting
error
messages returned
error
condition.
an
eect on
at the
end of
are
troubleshooting procedures
These procedures
the detected
this
referenced
by following
procedure,
by the
self test
error.
chapter
veries
by
symptom.
that isolate
the procedure
run the
synthesizer internal
routine,
are self-contained
If the
self
test
circuits
that
problems to
titled \Main
follow
the
and also
does
not
are
not
the
assembly
Troubleshooting." At
self
test.
procedures
that
verify the
detect
checked
any
errors
with
the
level.
Depending
verify
inputs
,
a
self
set
the
that
of
tests
1
the
.
Prior
The
to
Beginning
following
paragraphs
troubleshooting.
troubleshooting.
The
Service
T
o
access
in
the
service
instructions
grouped
install
P
ower
an
Supply
Occasionally
specication
On
the end
LEDs
. When
o,
the
many
on
by
assembly
assembly
,an
on the
of the
an LED
supply
P
position.
Troubleshooting
present
This
information
osition
of
the
measurement
Refer
how
to
install
.
The
individual
in
the
service
V
erication
apparent failure
power supply
power supply
is on,
that supply
has
failed
or
the
information
is
to
procedures
a
given
position.
on
assembly.
facing
supply
that
important
points
assembly
on
in
to
an
Chapter
in
troubleshooting
an
assembly
the
front
of
is operating
is
being
loaded
must
be
know
regardless
assembly
the
,
5,
\Assembly
service
procedures note
might
be
the
synthesizer
within
caused
its
down
understood
of
the
assembly
position.
by
,
there
specied
by
one
of
prior
to
beginning
the
path
taken
must be
Replacement,"
These
when it
a
voltage
procedures
is
are
seven
tolerance
the
assemblies
necessary
that
.
by
the
installed
for
is
out
green
If
the
.
are
of
LED
to
is
Troubleshooting 1-1
Troubleshooting
Safety
W
arnings
P
ay
attention
avoid
damage
Before
Caution
Warning
Considerations
and
Cautions
to
W
ARNINGS
to
the
equipment.
Applying P
V
and
must
terminals
erify
that
that
be
ower
the
the
provided
or
Maintenance
instrument
should
of
the
be
hazards
maintenance
should
Any
outside
will
be
interruption of
the instrument)
cause a
(Grounding
protection.)
this
instrument
and CA
UTIONS. They
instrument
correct
power
fuse
from
cable
the
described
and
with
performed
involved
can
be
removed.
potential
one conductor
In
addition, verify
and
is
set
to
is
installed.
main
power
.
herein
protective
only
by
service-trained
(for
example,
performed
the
protective
or
disconnecting
shock
hazard
of
the
test
equipment
must be
match
An
is
performed
covers
without
a
two
that
followed for
the
available
uninterrupted
source
to
the
with power
removed.
personnel
re and
power supplied,
(grounding)
the
that
could
conductor
a
common
prior
your protection
line
(mains)
safety
instrument
earth
input
supplied to
Such
maintenance
who
electrical shock).
the power
conductor
protective
result
outlet
ground
to
energizing
earth
in
personal
is
not
exists
(inside
sucient
either
and to
voltage
ground
wiring
are
aware
Where
or
terminal
injury
between
unit.
the
.
Whenever
instrument
unintended
If
this
reduction)
(that
Servicing
avoid
qualied
Energy
it
is
must
operation.
instrument
make
is
,
the
grounded
instructions
dangerous
to
do so
available
likely
be
is
sure
electric
.
at
that
made
to
be
that
side
are
many
the
protection
inoperative
energized
the
common
of
the
mains
for
use
shock,
points
do
may
has
and
be
via
an
autotransformer
terminal
supply).
by
service-trained
not
perform
,
if
contacted,
been
impaired,
secured
is
connected
any
against
personnel
servicing
result
in
the
any
(for voltage
to
unless
personal
injury.
Capacitors inside the instrument may still be charged even if the
instrument has
For continued
only with 250 V
normal blow
circuited fuse holders
been disconnected from its source of supply
.
protection against re hazard, replace the line fuse(s)
fuse(s) of the same current rating and type (for example
, time
delay, etc.). Do not use repaired fuses or short
.
neutral
only
.
T
o
1-2 Troubleshooting
Troubleshooting
Caution
After-Service
Visually
heat,
of
Using
pin
while
Check
Check
the
acceptable
Check
inspect the
such as
discolored printed
arcing. Determine
a suitable
on the
on/o
power
making
any
indicated
the
resistance
switch in
this
resistance
the
line
fuse
Unplug the
boards
the
power
There
be
damaged
straps
sockets
contain
is
are
several
when
.
instrument
by
servicing
Safety Checks
interior of
the instrument
and remedy
ohmmeter
cord
,
plug.
check
The
measurement
rear-panel
from
the
instrument
the ON
to verify
(
j
) position
is
two
megohms.
that a
before
devices
that
on.
components
electrostatic
sensitive
circuit boards
the cause
the
resistance
reading
to
determine
ground
must
terminals
and
Replace any
correctly
disconnecting
can
including
discharge
components
for
or
components
of
any
from
be
whether
that
enclosure
the
power
rated
be
damaged
.
any
signs
such
condition.
the
less
than
intermittent
are
to
line
source
component
fuse
is
or
removing
if
the
MOS
and
CMOS devices
Use
conductive foam
.
Carefully
of
abnormal
,
damaged
instrument
one
ohm.
discontinuities
marked,
and
using
neutral (tied
disconnected.
that
installed.
board is
unplug
internally
insulation,
enclosure
Flex
the
the
results
any
boards
.
removed when
that can
and grounding
ICs
in high-grip
generated
or
evidence
to
the
ground
power
cable
exist.
above
procedures
together) with
The
minimum
in
a
failure
.
Some
.
ESD
There
damaged
container
wrist strap
Precautions
are
several components
by
electrostatic discharge
whenever
. Refer
it is
to Chapter
including MOS,
(ESD). A
not installed.
10, \Legal
Use
and
CMOS,
sensitive
a
static
Regulatory
and
assembly
free
work
Information,"
microwave
should
area
and
devices
be
stored
a
properly
for
more
that
information.
Recommended
T
est
Equipment
Test equipment and accessories required to maintain the instrument are listed in
\Recommended T
critical specications listed in the table
est Equipment." Equipment other than that listed may be used if it meets the
.
can
be
in
an
antistatic
grounded
detailed
Table 1-1,
Troubleshooting 1-3
Troubleshooting
Service
R
TORX
Most
screwdriver
number
Screwdrivers
of
the
.
of
the
screwdriver
Pozidrive
Some screws
the screw
Pozidrive
head slots
is
Hardware
The
instrument
are
dened
National
Major
The
locations
for
selected
the
accompanying
in
nut,
Assemblies
Synthesized
the
Component-Level
and
schematic
A
ccessories
screws
is
The
#15
HP
in
the
part
number
R
TORX
8710-1617.
synthesizer
Screwdrivers
in the
HP
instrument
Signal
instrument appear
,P
ozidrive
8710-0899
has
a
mixture
Industrial
or
a
metric
,
P
of
individual
assemblies
HP
83711A/12A,
Generators
.
F
asteners
nut
arts
Information
for
that
specied assembly
are
of
the
#10
screwdriver
screwdrivers
The
part
number
of
Unied
publication
with
a Unied
,
and
Cable
components
.
The
HP
Component-Level
manual
R
TORX
R
TORX
is
HP
8710-1622.
to
be
Phillips
should
of
the
National
(IFI
National screw
Locations
mounted
information
83711B/12B
contains
.
screws
.
Remove
screwdriver
The
type
,
but
be
used.
No
.
2
P
ozidrive
(inch)
on
500).
printed
for
,
HP
and
Do
these
83731A/32A
Information
the
parts
these
screws
is
HP
8710-1623.
part
number
are
not.
T
o
The
part
number
is
HP
metric
not
use
screws
a
metric
because thread
circuit boards
assemblies
and
manual.
list,
Each
component-location
with
a
The
part
of
the
#25
TORX
avoid
damage
of
the
No
8710-0900
.
The
screw
damage
.
metric
in
will
a
are available
is provided
in
HP 83731B/32B
tabbed
section
diagram,
TORX
to
.
1
screws
Unied
occur
in
R
.
R
The
part
reference
example
information,
Chassis and
,
A6R9
see
frame
parts breakdowns
The procedures
Figures 3-1
gures are
Test P
to 3-4
located in
oint Locations
designation
is
R9 on
the parts
parts
in
Chapter
in this
show
the A6
list in
,
as
well
4.
chapter
where
Chapter 3.
is the
assembly designation
assembly
.
F
or
specic
the Component-Level
as
mechanical
reference
the
assemblies
cables
parts
and
and
component
Information P
and
cables
assemblies
cables
are
plus
located
the
descriptions
(W),
by
Most test points are indicated on the actual circuit-board assemblies
points called out in the troubleshooting procedures are shown
on the component-location
diagrams in the Component-Level Information manual.
part
designation.
and
acket
for
that
are
identied
their
reference
in
the
synthesizer
.T
est and measurement
designator
F
or
ordering
board.
in
illustrated
.
The
.
1-4 Troubleshooting
Troubleshooting
Service
Service
Aids
aids
designations
Other
Service
Service Documents
notes
information,
Cleaning
Cleaning
W
arning
Caution
on
Printed
on
printed
,
and
assembly
and
other service
contact
your
Intervals
Before
source
In
procedures
blower
throughout
circuit
part
nearest
cleaning,
.
This
or
compressed
the
Circuit
boards
include
numbers
literature are
Hewlett-P
make
is
to
eliminate
that
call
air
instrument.
Boards
test
.
available through
ackard oce
sure
the
the
for a
vacuum cleaner
.
Doing
points
,
indicator
.
instrument
possibility
so
will
cause
lights
, some
Hewlett-Packard.
is
disconnected
of
electrical
to
remove
the
dust
dust,
to
be
reference
F
or
from
shock.
do
not
transferred
further
the
use
a
power
Hewlett-P
instrument.
The
Cleaning
Hewlett-P
board
solution
the
solution
you
ackard
But,
instrument
Solution
ackard
edge
connectors
(NH4OH,
use
of
gloves
of
isopropyl
do
not
want
recommends
cleaning
should
be
recommends
.
F
or
29.5%
,
eye
NH3
goggles
alcohol
to
use
ammonium
a
12-month
intervals
cleaned
using
best
by
,
and
and
interval
are
more
either
cleaning
weight).
mostly
often
if
of
two
results
But,
dependent
a
proper ventilation.
water
hydroxide
(IP
A/H
O).
2
.
between
upon
it
is
in
a
dusty
cleaning
,
we
recommend
concentrated
The second
This
should
cleaning
where
or
solutions
an
solution
serve
for
some
parts
the
instrument
very
humid
on
printed
ammonium
of
area.
circuit
hydroxide
ammonia
recommendation is
as
a
satisfactory
of
the
is
used.
(PC)
requires
an
80:20
cleaner
12-Month Cleaning
At 12-month intervals the instrument covers should be removed to gain access to the cooling
fan.
Wipe the instrument fan with a clean cloth or tissue
Remove each printed circuit board, and clean the component side of
compressed air
. Set the air pressure to 20 psi maximum. T
, or vacuum for dust.
the board with
o remove the boards
, refer to
Chapter 5, \Assembly Replacement." Return the boards to the instrument.
After cleaning, reinstall the covers.
if
Troubleshooting 1-5
Troubleshooting
After
Once
the
Generators
and
The
Repair
the
synthesizer
HP
83711A/12A,
Calibration
adjustments
following
table
troubleshooting.
Equipment Critical
Frequency
Counter
Function
Generator
Multimeter No
Oscilloscope HP
P
ower
Meter
Calibration
is
repaired,
HP
83711B/12B
Guide
.
Chapter
6,
contains
T
Frequency
Frequency:
Amplitude:
A
Frequency
it
to
determine
\P
ost-Repair
the
list
able
1-1.
substitute
ccuracy:
may be
,
necessary to
HP
83731A/32A
when
Procedures
of recommended
Recommended
Specications
Range:
100
0
0.02
range: 100
to
kHz
5
dB
1
to
Vp-p
20
MHz
calibrate the
and HP
it
is
necessary to
," should
test equipment
T
est
Equipment
GHz
instrument. Refer
83731B/32B Synthesized
use the
be referred
that can
performance tests
to as
well.
be used
Recommended
Model
HP
5343A
HP
3325A
HP
3458A
54111D
HP
437B
to
Signal
for
P
ower
Sensor
P
ower Supply
Signal
Generator
Spectrum
Analyzer
P
ower
Meter
Range:
0
10
Frequency
Amplitude:
compatible
V
to
+10
Range:
0
10
dBm
1
V
MHz
to
to
+10
25
dBm
MHz
HP
HP
HP
HP
8482A
6235A
8663A
8566B
1-6 Troubleshooting
Troubleshooting
Main
1. Run
Troubleshooting
the
a.
Press
b.
Press
c.
T
erminate
When
4
SPCL
on
the
synthesizer
run.
Pressing
As
the
self
appear
passed
If
momentarily
the
the
the
troubleshooting
a
failed.
If
continue
on
the
self
4
MSG
self
display
unique number
The self
no
failure
instrument
the
4
SPCL
5
on
4
the
5
the
5
5
,
,
4
5
any
test
is
the
display
will
appear
test
does
,
and
5
key
,
and
test,
and
,
be
prepared
purposes.
. \Y"
test aborts
is detected,
.
If
a failure
self
5
key
.
numeric
entry
5
(ENTER)
4
Hz
display
key
other
running,
.
on
detect
then
a
message
\XX"
is the
is detected,
test.
keypad.
by
pressing
is
pressed,
.
Pressing
than
the
messages
If
the
self
test
the
display
a
failure,
the
self
test
will
be displayed
represents
to
write
down
\X" references
hexadecimal sum
upon completion
go to
the
continue
5
(ENTER)
4
Hz
the
5
(ENTER)
4
Hz
5
will
4
Hz
PRESETTING
does
.
the display
will stop
the
failed
the
procedure
text
cause
not
.At
group
error
atest
of
of a
entitled
with
SELF
will
the
self
detect a
will show
this point,
in the
. Rerun
code
group
all
test
the
next
form of
test
group
\Symptom
TEST?,
then
test
INSTRUMENT
failure,
numbers in
\X
=
.
Each
numbers
step
PRESS
cause
not
the message
the
MSG
\40XX". \40"
the self
Y",
as
test
that
reports
.
ENTER
all
self
to
run.
and
SELF TESTING!
the
LED
test.
this
will
within
within
Troubleshooting"
test
segments
Self Test
form
will
represents
As
you
be
a
test
a
test
test
failures
will
\X
be
monitor
used
group
group
lit.
to
be
=
for
.
shown
to
will
Y"
Press
is
given
that
be
2.
Decode
by
Note
a.
b.
c. T
d. Continue this subtraction process until the result is zero
the
numerical
the
result.
It is
information.
resultant
from
Search through
the
procedures on
(\X"
in
\X
=
F
or
example
the
tables in
If
the
lists included in the procedure
number does not
o decode
largest number that can be
example,if22=fc
number from the list of \22
errors is 22 = 80 and the result of the subtraction leaves 7c
when fully decoded, will yield 22 = 80, 22 = 40, 22 = 20, 22 = 10, 22 = 8, and 22 = 4.
,
the following
second
the error display
self
test
result
to
not
necessary
error
LO
Assembly").
the tables
the following
Y").
if
22
=
fc
number
of
match, it must be decoded.
is displayed, subtract 80 from fc (80 is the largest hexadecimal
to
decode
F
or
example
text
for
all
titled \Error
pages to
is
displayed
procedures
the
error
display
, that is the only error message reported. If the second
, nd the number in the list of error messages that is the
subtracted from the displayed number and subtract it. F
= Y" errors that can be subtracted from fc). One of the
determine
the
,
if
multiple
error
Groups
nd
as
the
and
matches
the
error
messages
errors
numbers
Covered"
the
result
nd
the
component
in
would
rst
number
of
running
error
any
of
.F
error
if
doing
error
group
be
identical
that
are
of
the
self
messages
the
error
.
or example
messages
so
provides
8
(\Data
at
the
the
error
test,
that
numbers
, the result
are
beginning
search through
begin
indicated
no
further
decoded,
Readback
display
with
in
the
22 = fc
the
of
22.
error
or
,
If the message returned was 36 = 550, 550 would have to be decoded in order to
determine the failure conditions.To decode 36 = 550, review the list of codes for table
36. Find the largest number from the list that can be subtracted from 550. In table 36,
this number would be 400. 36 = 400 is one of the tests that failed. Take the remainder
from the rst subtraction and once again subtract the largest number from the list that is
Troubleshooting 1-7
Troubleshooting
smaller
to
determine each
550
0
150
0
50
0
40
10
0
10
These
1.65,
2.75,
3.
Carry
out
troubleshooting.
than the
400
=150.
100
=50.
=10.
=
0.
codes
4.8,
the
procedure
remainder.
test that
Unleveled
Unleveled
Unleveled at
Unleveled
indicate
and
8.0
Begin
at
that
that
the
Continue with
failed.
at
at
4.8
2.75
at
1.65
this
instrument
GHz.
follows
procedure
8.0
GHz.
GHz.
GHz.
the
GHz.
this process
failed
applicable
appropriate
4
tests
list
for
of
the
until
in
table
error
messages
the
remainder
36.
It
messages
reported.
was
and
is
0
in
unleveled
continue
order
at
1-8 Troubleshooting
Troubleshooting
Microprocessor
The
following
Note
error
Prior
are
ABUS
1.
Errors
Measure
shown
(connect
the suspected
in
the
following
the
voltmeter
Assembly
groups
pertain
Error Group Description
4=
6
7
to
replacing
within
specication
Error
4
=
1
4
=
2
4
=
4
4
=
8
voltage at
table.
ground
(A3)
Y
=
Y
=
Y
Group
Do
Troubleshooting
to
the
microprocessor
ABUS Errors
0.5
V/GHz
an
assembly
the
not
lead to
at
6
Digital
Analog
Digital
disconnect
the
15
V
pin
number
A3TP4).
or
power
on
+5
+5
Ground
assembly
Output
module
,
verify
connection
Description
CPU
Assy
V
on
the
CPU
V
on
the
on
the
of
J1
on
W8
from
.
Errors
that
to
the
Assy
CPU
Assy
CPU
Assy
the
microprocessor
J1
when
the
power
assembly or
making
supply
module.
assembly
the
measurement
voltages
(A3)
+15
Digital
+5.2
0
+5
2.
If
the
voltage
one
or
more
3. On the end of the
is
present and
voltages
are
failing,
power supply facing the front of the synthesizer
LEDs. When the LEDs are
the LED for the failing voltage is
Suspect
V
oltage
V
Ground
V
digital
15
V
V
analog
within tolerance
continue
on, the supplies are operating within their specied tolerance
on, replace W8. If the LED is o, continue with the next
J1
Pin
Number
4 +15
13 0
6 +4.8
12
8 +5
at J1,
with
the
0
replace the
next
step.
4. One of the assemblies is loading down the power supply
one assembly at a time to locate the failing assembly
.
V
oltage
V
6
1
V
V
6
0.1
V
V
to
+5.4
V
15
V
6
1
V
V
6
0.6
V
step
microprocessor assembly
.
.If
, there are seven green
.If
. Disconnect W8 from each assembly
Troubleshooting 1-9
Troubleshooting
0.5
V/GHz Output
Errors
1.
Connect
voltmeter
2.
Set
more
specied).
3.
Verify
a
the
synthesizer
than
that the
voltmeter
ground
one
lead
frequency
voltage
to
pin 5
to
output
at
Error
6
=
6
=
6
=20
6
=
6
=
6
=800
6
=
6
=
7
=
of J1
A3TP4).
frequency
point
failed,
J1
is
within
Group
2
8
80
200
2000
8000
2
on the
to
set
the
Description
F
ailure
F
ailure
F
ailure at
F
ailure
F
ailure
F
ailure at
F
ailure
F
ailure
F
ailure
microprocessor assembly
the
frequency
the
output
tolerance
Frequency V
1.0
GHz
0.5
3.0 GHz 1.5 V
6.0
9.0
12.0
15.0
18.0
20.0
0.01
GHz
GHz
GHz
GHz
GHz
GHz
GHz
3.0
4.5
6.0
7.5
9.0
10
5
mV
at 1.0
at
at
at
at
at
at
shown
oltage
V
6
6
V
6
V
6
V
6
V
6
V
6
V
6
6
GHz
3.0
GHz
6.0 GHz
9.0
GHz
12.0
GHz
15.0 GHz
18.0
GHz
20.0
GHz
0.01 GHz
specied
frequency
in
0.50 V
0.50
V
0.50
V
0.50
V
0.50
V
0.50
V
0.50
V
0.50
V
0.5 V
in
to
the
(A3)
(connect
the
error
the
lowest
following
message
frequency
table
.
the
(if
If
the
voltage
0.5V/GHz
continue
4. P
erform the adjustment procedure \0.5 V/GHz Output A
is within
tolerance,
output connector
with
the
next
step
check the
and replace
.
continuity of
it if
necessary.
W8
If the
between
voltage is
J1
pin
out of
5
and
tolerance
djustment" in the Calibration Guide
If the 0.5 V/GHz output cannot be adjusted using the procedure or the self test still fails
replace the microprocessor assembly
ensure
that the 0.5 V/GHz output is functioning at all tested frequencies
. If it can be adjusted successfully
, rerun the self test to
.
1-10 Troubleshooting
the
,
.
,
LO
Synthesizer
The
following
Note
Data
Readback
and
error
groups
Reference
pertain
Assembly
to
the
LO
synthesizer
(A6)
Troubleshooting
and
Error Group Description
8=
9
=
10
=
11 =
12
=
Y
Y
Y
Y
Y
Prior
are
within
Data Readback
ABUS
Oscillator
Errors
Cold
LO Synthesizer/Reference
to
replacing
an
assembly
specication at
Errors
Error
or
the power
Unlocked/Divide V
module,
verify that
connection to
Errors
reference
the assembly
assembly
oltage
Errors
the power
Troubleshooting
.
supply voltages
or
module
.
1.
Install
procedure
this
2.
Using
and
timebase
activity
activity
3.
Sequentially probe
the
replace
ABUS
the
LO
\LO
manual.
an
oscilloscope
reference
to
is
not
is seen
instrument while
the microprocessor
Errors
Error
8
8
8
8
synthesizer
(Local
assembly
10
s/division).
seen
on all
pins 6,
Group
=
1
=
2
=
4
=8
and
Oscillator)
,
sequentially
(A6)
Preset
on
one
or
pins,
replace
8, 10,
probing each
assembly.
Data
Readback
Data
Readback
Data
Readback
Data
Readback from
reference
Synthesizer/Reference
probe
(connect
more of
the
the
and
the
instrument
these pins
LO
12
pin. If
If activity
Description
assembly
pins 6,
oscilloscope
, continue
synthesizer
of
J2
on
activity is
from
from
from
in
8, 10,
while
the
is seen,
Error Group Description
9=1 LO Assy ABUS:
9=2 LO Assy ABUS: +5 V
9=4 LO Assy ABUS: +13 V
the
LO
Assembly
the
LO
Assembly
the
LO
Assembly
the LO
the
Board
and 12
ground
service
Assembly
position.
Assembly
of
P1
lead
probing each
with the
and
reference
microprocessor
not
seen
on
one
replace
the
Analog Gnd
Refer
A6"
on
the
to A3TP4
pin. If
next
step
assembly
assembly
or
more
data
cable
to
in
Chapter
LO
synthesizer
and set
TTL
.
If
TTL
.
(A3).
of
these
(W9).
the
the
level
Preset
5
level
pins
of
,
1. Install the LO synthesizer and reference assembly in the service position. Refer to the
procedure \LO (Local Oscillator) Synthesizer/Reference Board Assembly A6" in Chapter 5 of
this manual.
2. Preset the synthesizer.
Troubleshooting 1-11
Troubleshooting
3. Measure
the voltmeter
the next
4. Use
and reference
control information
For
F
or
and
a.
b.
c.
d.
5.
Measure
tolerance
tolerance
the voltage
step.
the direct
future reference
example
reference
Press
4
SPCL
Press
Press
Press
5
4
60
5
4
on the
3
5
4
on the
4
the
shown
,
continue
at TP6
ground lead
If the
voltage is
control function
assembly (A6)
for use
, the
V
Analog
+13
,
to switch
assembly:
5
.
on
the
voltage
in
+5 V
numeric
numeric
numeric
at
TP6
the
table
with
on the
to A3TP4).
to switch
with the
acronyms
ABUS
oltage
Ground
+5
V
V
to the
keypad,
keypad,
keypad,
on
,
replace
the
next
microprocessor assembly
If the
voltage is
a
negative
to cause
the
microprocessor
step
voltage
the
the suspected
direct control
HW
and
HW
CTRL
ADDRESS
3 1 0
3 4 1.2
3 6 1.3
output of
then
terminate
then
terminate
then
terminate
the
microprocessor
.
analog
CTRL
HW
the
,
V
analog
between 0
continue
multiplexer
ABUS
function is
stand
for
CTRL
ALUE
multiplexer
the
entry
the
entry
the
entry
assembly
assembly
(A3) using
to
with
step
(U20)
voltage
shown
hardware
V
oltage
V
6
0.5
V
6
V
6
by
pressing
by
pressing
by
pressing
.
If
the
.
a
5
volts
7.
on
to
its
in
the
and
V
0.12
V
0.2
V
on
the
voltage
If
it
is
voltmeter
,
continue
the
LO
synthesizer
output.
following
control.
LO
synthesizer
5
(ENTER).
4
Hz
5
(ENTER).
4
Hz
5
(ENTER).
4
Hz
is
within
missing or
(connect
with
Direct
table
the
out of
.
6.
Measure
should
replace
continuity
7.
Use
reference
a.
b.
c.
d.
8. Measure
assemblies
cable is removed from the assembly that is loading the ABUS down.
that is loading the ABUS down. If no change is noted after the ABUS cable has been
disconnected from all assemblies
Oscillator Cold Error
1. Probe J8 pin 13 on the LO synthesizer and reference assembly (A6) with a voltmeter
(connect the voltmeter ground lead to A3TP4).
the
Press
Press
Press
Press
the
voltage
be
within
the
LO
of
the
direct
control
assembly
5
.
4
SPCL
5
on
4
60
5
on
4
3
5
on
4
0
the voltage
(one
at
TP13
the
tolerance
synthesizer
ABUS
the
the numeric
the numeric
at
function
to
switch
numeric
at TP13
a
time).
cable
on
the
LO
synthesizer
shown
and
reference
(W9)
to
the
keypad,
keypad, then
keypad, then
while disconnecting
The
voltage
Error Group Description
10 = 1 Oscillator Oven Cold
in
the
table
assembly
with
an
ohmmeter
cause
the
analog
\no
connect"
then
terminate
terminate the
terminate the
will
change
, replace the ABUS cable
and
reference
.
If
it
is
.
If
it
and
multiplexer on
input
to
its
the
entry
entry by
the ABUS
to
a
non-negative
missing
is
within
replace it
output.
entry
.
assembly
or
tolerance
if
the LO
by
pressing
by
pressing
pressing
cable from
.
The
voltage
isn't
within
necessary
synthesizer
4
4
each of
value
Replace the assembly
,
check
5
4
Hz
5
(ENTER).
Hz
5
(ENTER).
Hz
when
tolerance,
.
(ENTER).
the
the
the
and
other
ABUS
2. Verify that the voltage at J8 pin 13 is less than 3 volts.
1-12 Troubleshooting
If
the voltage
volts
.If
the voltage
at
W8 pin
LO
Synthesizer and
is greater
13 is
less
at
than
than 3
W8
3
pin
volts
volts,
13
is
,
replace
ensure
greater
Reference Unlocked/Divide
the
that
than
LO
synthesizer
the
3
voltage
volts
V
oltage
,
trace
at
W8
it to
and
reference
Errors
pin
13
is
its source
assembly.
Troubleshooting
less
than
3
.If
the voltage
Error
11
=
11
=
11
=
11
=
11
=
11 =
11
=
11
=
11
=
11
=
11
=
11
=
11
=
11 =
11
=
12
=
12
=
12
=
12
=
12
=80
12
=
12
=
12
=
12
=
12
=
12 =
12
= 40000
Group
2
8
10
40
80
200
400
1000
2000
8000
10000
40000
80000
200000
400000
2
4
10
20
100
400
800
2000
4000
10000
Description
LO
Synth/Ref
LO
Synth
LO
Synth/Ref
LO
Synth
LO
Synth/Ref
LO Synth
LO
Synth/Ref
LO
Synth
LO
Synth/Ref
LO
Synth
LO
Synth/Ref
LO
Synth
LO
Synth/Ref
LO Synth
LO
Synth/Ref
LO
Synth
LO
Synth/Ref
LO
Synth
LO
Synth/Ref
LO
Synth Divide
LO
Synth/Ref
LO
Synth
LO
Synth/Ref
LO
Synth
LO
Synth/Ref
LO Synth/Ref
LO
Synth/Ref Unlocked
Unlocked at
Divide
Unlocked
Divide
Unlocked
Divide V
Unlocked
Divide
Unlocked
Divide
Unlocked
Divide
Unlocked
Divide V
Unlocked
Divide
Unlocked
Divide
Unlocked
Unlocked
Divide
Unlocked
Divide
Unlocked
Unlocked at
V
oltage
V
oltage
oltage at
Voltage
V
oltage
V
oltage
oltage
V
oltage
V
oltage
Voltage
V
oltage
V
oltage
2.0 GHz
at
2.385
at
2.385
at
2.121
at
2.121
2.156
at
2.156
at 2.191
at
2.191
at
2.226
at
2.226
at
2.261
at
2.261
at
2.296
at
2.296
at
2.023
at
2.023
at
2.025
at
2.025
at
2.055
at
2.055
at
2.085
at
2.085
at
2.115
at
2.115
2.385 GHz
at 2.115
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
GHz
To Troubleshoot an LO Synthesizer/Reference Unlocked Condition
1. Install the LO synthesizer and reference assembly in the service position. Refer to the
procedure \LO (Local Oscillator) Synthesizer/Reference Board Assembly A6" in Chapter 5
of this manual.
2.
Connect a 10 MHz time base to the external reference inputs of the synthesizer and a
frequency counter
. Make sure the time base output power is between 0 dBm and +10
dBm.
3. Disconnect W10 from J4 on the LO synthesizer and reference assembly (A6) and connect J4
to the input of the frequency counter through a 20 dB attenuator.
4. Verify that the frequency at J4 is 3 MHz plus-or-minus one count.
Troubleshooting 1-13
Troubleshooting
If
the frequency
ohmmeter
If
W12 is
procedure
5.
Disconnect the
connector
6.
Using
If
the
reference
7.
Disconnect
output
8.
P
erform
If
steps
.If
opened, replace
.
.
an
oscilloscope
voltage
assembly
the
of
the
steps
3
through
synthesizer
W10
to
J4,
and
9.
Disconnect
the
10.
Connect
voltmeter
input
W1
of
a
voltmeter
ground
at J4
is incorrect
W12 has
continuity
frequency counter
,
verify
at
the
tee
connector
,
otherwise
external
10
synthesizer
3
through
6
fail
with
and
reference
continue
from
J7
on
the
frequency
to
P1
lead
to
W12.
that
,
MHz
to
the
6
again.
the
assembly
with
the
the
counter
pin
A3TP4).
or missing,
,
replace
If
the
from
the
is
continue
time
reference
external
,
otherwise
next
LO
synthesizer
through
2
on
the
the
frequency
J4
and
voltage
incorrect
with
base
from
input
10
step
.
a
LO
synthesizer
check
LO
synthesizer
at
reconnect
at
the
or
missing,
this
procedure
the
of
MHz
time
,
remove
and
reference
20
dB
the
continuity
J4
is
correct,
W10
tee
connector
replace
synthesizer
the
frequency
base
the
SMC
attenuator
and
reference
of
W12
and
reference
continue
to
J4
through
is
4.5
the
LO
.
and
connect
counter
disconnected,
tee
connector
assembly
and
.
assembly
with
an
assembly
with
this
an
Vp-p
6
0.5
synthesizer
the
.
replace the
,
reconnect
connect
(connect the
.
SMC
tee
Vp-p.
and
reference
LO
J7
to
11.
Set
the
the
self
Output
synthesizer
test
and
Frequency
(GHz)
2.000 331
2.385 300
2.121 305
2.156 310
2.191 315
2.226 320
2.261 325
output
measure
frequency
the
frequency
Measured
Frequency
(MHz)
to
the
at
failing
J7
for
frequency or
each
suspected frequency
Output
(GHz)
2.023 335
2.025 340
2.055 345
2.085 350
2.115 355
2.385 300
2.115 355
frequencies indicated
Frequency
.
Measured
Frequency
(MHz)
2.296 330
12. V
erify that the measured frequency is exactly as shown in the
and that the voltage at P1 pin 2 remains at a TTL low level.
second column of the table
If the suspected frequency
or frequencies as well as the voltage level is correct, continue with the next step
suspected frequency or the TTL voltage level is incorrect, replace the LO synthesizer and
reference assembly
13.
Disconnect the frequency counter from J7 and connect a power meter and sensor to it.
.
by
.Ifa
14. Measure the power at J7 at the suspected output frequency. The power level should be
+14 dBm61dB. If the power level is correct, the LO synthesizer and reference assembly
is functioning correctly. If the power level is incorrect, replace the LO synthesizer and
reference assembly.
1-14 Troubleshooting
Troubleshooting
Note
T
o Troubleshoot
1.
Install the
procedure
this
manual.
2.
Connect
the
3.
Connect a
4.
Set
5.
V
erify
a
voltmeter ground
the
synthesizer
that
suspected
remains
and
replace
at
reference
the
Note
If this
troubleshooting
reference
only
malfunction
optionally
an Incorrect
LO synthesizer
\LO
(Local
voltmeter
Oscillator)
to
lead
frequency
counter
output
the
frequency
frequency
a
TTL
low
as
level.
assembly
LO
synthesizer
If
this
troubleshooting
reference
only
malfunction
optionally
test
functionality
assembly
replace
Synthesizer
and
P1
pin
to
A3TP4).
to
frequency
at
the
measured
If
is
functioning
and
assembly
replace
.
procedure
is
functioning
on
the
assembly
the
microprocessor
has
correctly
is
Divide
reference
assembly
synthesizer/Reference
2
on
the
LO
synthesizer
the
RF
to
synthesizer
on
a
the
frequency
reference
procedure
is
functioning
on
the
assembly
the
LO
output
the
frequency
correctly
synthesizer
connector
suspected
RF
output
and
.
assembly
has
correctly
is
determined
likely
in
assembly
V
oltage
in
the
Board
and
failing
connector
counter
TTL
level
If
the
frequency
.
determined
likely
in
and
reference
that
but
the
the
self test
to
restore
Condition
service
Assembly
reference
of
the
frequency
and
that
are
correct,
that
but
the
the
self
the
LO
self
test
still fails
circuitry.
self
position.
A6"
assembly
synthesizer
.
is
within
the
voltage
the
or
TTL
level
the
LO
self
test
still
test
circuitry
assembly
synthesizer
, the
You
test
functionality
Refer
to
in
Chapter
(A6)
.
one
count
at
P1
LO
synthesizer
is
incorrect,
synthesizer
fails
,
.
Y
ou can
to
restore
and
can
the
5
(connect
of the
pin
and
the
self
.
of
2
Troubleshooting 1-15
Troubleshooting
Y
O
The
Loop
following
and
error
Error Group Description
13 =
14
=
15
=
Note
Data
Readback
Oset
Y
Y
Y
Prior
are
Synthesizer
groups
pertain
Data Readback
ABUS
Oset
to
replacing
within specication
Errors
Assembly
to
the
Y
O
Errors
Error
Synthesizer
an assembly
at the
(A7)
loop
and
oset
Incorrect
or module
Frequency/Unlocked
, verify
power connection
Troubleshooting
synthesizer assembly
Errors
that
the
power
to
the
assembly
.
supply
or
module
voltages
.
1.
Using an
Y
and set
O
oscilloscope,
loop
and
oset
the timebase to 10
Error
13
13
13
13
13 =
13
13
13
13
13
13
13 =
13
13 =
13
13
Group
=
1
=
2
=
4
=
8
10
=
20
=
40
=
80
=
100
=
200
=
400
800
=
1000
2000
=
4000
=
8000
sequentially probe
synthesizer
assembly
s/division). Preset the instrument while probing each pin. If
Data
Readback
Data
Readback
Data
Readback
Data
Readback
Data Readback
Data
Readback
Data
Readback
Data
Readback
Data
Readback
Data
Readback
Data
Readback
Data Readback
Data
Readback
Data Readback
Data
Readback
Data
Readback
pins 12,
(A7)
(connect
TTL level activity is not seen on one or more of these
TTL level activity is seen on all pins
, go to step
Description
from
the
from
the
from
the
from
the
from the
from
the
from
the
from
the
from
the
from
the
from
the
from
the
from
the Y
from the
from
the
from
the
13,
14,
the
pins, continue with the next step
3 to continue
Y
O/Oset
Y
O/Oset
Y
O/Oset
Y
O/Oset
Y
O/Oset
Y
O/Oset
YO/Oset
Y
O/Oset
Y
O/Oset
Y
O/Oset
Y
O/Oset
Y
O/Oset
O/Oset Assy
YO/Oset
Y
O/Oset Assy
Y
O/Oset
15,
16,
17,
oscilloscope
.
Assy
Assy
Assy
Assy
Assy
Assy
Assy
Assy
Assy
Assy
Assy
Assy
Assy
Assy
18,
and
ground
19
of
lead
J3
to
on
the
A3TP4
.If
2. Sequentially probe pins 12, 13, 14, 15, 16, 17, 18, and 19
assembly (A3). Preset the instrument while probing each pin. If activity is not seen
or more of these pins
, replace the microprocessor assembly
of J2 on the microprocessor
. If activity is seen
on all pins
on one
,
replace the data cable (W9).
3. Using an oscilloscope, sequentially probe pins 5, 6, 8, 20, 21, 22, 24, and 26 of J3 on the
YO loop and oset synthesizer assembly. Preset the instrument while probing each pin. If
activity is not seen on one or more of these pins, continue with the next step. If activity is
seen on all pins, replace the YO loop and oset synthesizer assembly.
4. Sequentially probe pins 5, 6, 8, 20, 21, 22, 24, and 26 of J2 on the microprocessor assembly.
Preset the instrument while probing each pin. If activity is not seen on one or more of these
1-16 Troubleshooting
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