HP HP 8753E User manual

Errata
Title & Document Type: 8753E Network Analyzer Service Guide
Manual Part Number: 08753-90374
Revision Date: February 1999
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Service Guide
HP 8753E Network Analyzer
HEWLETT
PACKARD

HP part number: 08753-90374 Supersedes October 1998
Printed in USA February 1999
Notice.
The information contained in this document is subject to change without notice.
Hewlett-Packard makes no warranty of any kind with regard to this material,
including but not limited to, the implied warranties of merchantability and
fitness for a particular purpose. Hewlett-Packard shall not be liable for errors
contained herein or for incidental or consequential damages in connection with
the furnishing, performance, or use of this material.
@Copyright 1998-1999 Hewlett-Packard Company

Network Analyzer Documentation Set
The Installation and Quick Start
Guide familiarizes you with the
network analyzer’s front and rear
panels, electrical and environmental
operating requirements, as well as
procedures for installing, conGguring,
and verifying the operation of the
analyzer.
The User’s Guide shows how to make
measurements, explains
commonly-used features, and tells you
how to get the most performance from
your analyzer.
The Quick Reference Guide provides
a summary of selected user features.
TheHP-IB Programmiug and
Command Reference Guide provides
programming information for
operation of the network analyzer
under HP-IB control.
. . .
III

The BP BASIC Programming
Examples Guide provides a tutorial
introduction using BASIC programming
examples to demonstrate the remote
operation of the network analyzer.
The System Veracation and Test
Guide provides the system verification
and performance tests and the
Performance Test Record for your
analyzer.

Contents
1. Service Equipment and Analyzer Options
lhble of Service Test Equipment ................
Principles of Microwave Connector Care ............
Analyzer Options Available ...................
Option lD5, High Stability Frequency Reference ........
Option 002, Harmonic Mode .................
OptionOO6,6GHzOperation.................
Option 010, Time Domain ..................
Option 011, Receiver Configuration ..............
Option 075,750 Impedance..................
Option lDT, Delete Display ..................
Option lCM, Rack Mount Flange Kit Without Handles .....
Option lCP, Rack Mount Flange Kit With Handies .......
Service and Support Options ..................
Option W32 .........................
Option W34 .........................
2. System VeriIkation and Performance ‘lksts
System Specifications .....................
Instrument
SpecBcations ....................
System Verification Procedure .................
Performance Tests .......................
How to ConfIrm Performance to System Specifications .....
How to ConfIrm Performance to Instrument Specifications ...
Certificate of Calibration ....................
Sections in This Chapter ....................
Performance Test Record ....................
System Verification Cycle and Kit Re-certification
........
HP 8753E System Verification .................
Initiaiization .........................
Measurement Calibration ...................
Device Verification ......................
l-l
l-5
l-7
l-7
l-7
l-7
l-7
l-7
l-8
l-8
1-8
l-8
l-9
l-9
l-9
2-l
2-2
2-2
2-3
2-3
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-11
2-14
contmts-1

In Case of DifficuIty
.....................
1. Test Port Output Frequency Range and Accuracy.......
In Case of
Difficuhy
.....................
2. External Source Mode Frequency Range...........
InCaseofDifficulty .....................
3. Test Port Output Power Accuracy ..............
InCaseofDifficuIty
.....................
4. Test Port Output Power Range and Linearity.........
In Case of Difficulty
.....................
5.MinhnumRChannelLevel. .................
In Case of Difficulty
.....................
6. Test Port Input Noise Floor Level ..............
Port 1 Noise Floor Level from 300 kHz to 3 GHz (IF BW = 3 kHz)
Port 1 Noise Floor Level from 300 kHz to 3 GHz (IF BW = 10 Hz)
Port 2 Noise Floor Level from 300 kHz to 3 GHz (IF BW = 10 Hz)
Port 2 Noise Floor Level from 300 kHz to 3 GHz (IF BW = 3 kHz)
Port 2 Noise Floor Level from 3 GHz to 6 GHz (IF BW = 3 kHz) .
Port 2 Noise Floor Level from 3 GHz to 6 GHz (IF BW = 10 Hz) .
Port 1 Noise Floor Level for 3 GHz to 6 GHz (IF BW = 10 Hz) . .
Port 1 Noise Floor Level from 3 GHz to 6 GHz (IF BW = 3 kHz) .
InCaseofDifficulty
.....................
7. Test Port Input Frequency Response.............
Power Meter Calibration for Test Port 1 from 300 kHz to 3 GHz .
Test Port 2 Input Frequency Response from 300 kHz to 3 GHz
.
Power Meter Calibration on Port 2 from 300 kHz to 3 GHz
...
Test Port 1 Input Frequency Response from 300 kHz to 3 GHz
.
Power Meter Calibration for Test Port 2 from 3 GHz to 6 GHz . .
Test Port 1 Input Frequency Response from 3 GHz to 6 GHz
Power Meter Calibration on Test Port 1 from 3 GHz to 6 GHz : 1
Test Port 2 Input Frequency Response from 3 GHz to 6 GHz
. .
In Case of Difficulty .....................
8.
Test Port Crosstalk
CrosstaurtoTestPort2from30d1;H;.tb3GI;z’ 1 1 1 1 1 1 1 1
Crosstalk to Test Port 1 from 300 kHz to 3 GHz
........
CrosstaIktoTestPortlfrom3GHzto6GHz
.........
Crosstalk to Test Port 2 from 3 GHz to 6 GHz
.........
InCaseofDifficuIty
.....................
9. Calibration Coefficients ...................
First
FulI 2-Port Calibration .................
Directivity (Forward) Calibration Coefficient
..........
Source Match (Forward) Calibration Coefficient
........
Contents-2
2-17
2-18
2-20
2-21
2-23
2-24
2-26
2-27
2-29
2-31
2-33
2-37
2-38
2-39
2-39
2-40
2-40
2-41
2-41
2-41
2-42
243
2-44
2-47
2-48
249
2-49
2-51
2-52
2-53
2-53
2-54
2-55
2-55
2-55
2-56
2-56
2-58
2-59
2-61
2-61

Transmission Tracking (Forward) Calibration Coefficient
....
2-61
Reflection Tracking (Forward) Calibration Coefficient
......
2-61
Load Match (Reverse) Calibration Coefficient .........
2-61
Transmission Tracking (Reverse) Calibration Coefficient
....
2-62
Second FuiI 2-Port Calibration ................
2-62
Load Match (Forward) Calibration Coefficient .........
2-64
Directivity (Reverse) Calibration Coefficient ..........
2-64
Source Match (Reverse) Calibration Coefficient .........
2-64
Reflection Tracking (Reverse) Calibration Coefficient
......
2-64
10. System Trace Noise (Only for Analyzers without Option 006)
.
2-65
System Trace Noise for A/R Magnitude ............
2-66
System Trace Noise for A/R Phase ..............
2-66
System Trace Noise for B/R Magnitude ............
2-66
System Trace Noise for B/R Phase ..............
2-67
In Case of DifficuIty
..................... 2-67
11. System Trace Noise (Only for Analyzers with Option 006)
. .
2-68
System Trace Noise for A/R Magnitude from 30 kHz to 3 GHz .
.
2-69
System Trace Noise for A/R Magnitude from 3 GHz to 6 GHz
. .
2-69
System Trace Noise for A/R Phase from 3 GHz to 6 GHz
....
2-69
System Trace Noise for A/R Phase from 30 kHz to 3 GHz
....
2-70
System Trace Noise for B/R Magnitude from 30 kHz to 3 GHz .
.
2-70
System Trace Noise for B/R Magnitude from 3 GHz to 6 GHz
. .
2-70
System Trace Noise for B/R Phase from 3 GHz to 6 GHz
....
2-70
System Trace Noise for B/R Phase from 30 kHz to 3 GHz ....
2-71
InCaseofDifficuIty
.....................
2-71
12. Test Port Input Impedance.................
2-72
In Case of Difficulty
.....................
2-76
13. Test Port Receiver Magnitude Dynamic Accuracy
.......
2-77
Initial CalcuIations
......................
2-79
Power Meter Calibration
...................
2-80
Adapter Removal Calibration .................
2-83
Measure Test Port 2 Magnitude Dynamic Accuracy .......
2-85
Measure Test Port 1 Magnitude Dynamic Accuracy .......
2-87
InCaseofDifficuIty
.....................
2-87
14. Test Port Receiver Magnitude Compression
.........
2-89
Test Port 2 Magnitude Compression ..............
2-90
Test Port 1 Magnitude Compression ..............
2-91
In Case of Difficulty
.....................
2-91
15. Test Port Receiver Phase Compression ............
2-92
Test Port 2 Phase Compression ................
2-93
Test Port 1 Phase Compression ................
2-94
Contents-3

2a.
2b.
3.
In Case of Difficulty
.....................
16. Test Port Output/Input Harmonics (Option 002 Analyzers
without Option 006
only)..................
‘l&t Port Output Worst Case 2nd Harmonic
..........
Test Port Output Worst Case 3rd Harmonic
..........
Port 1 Input Worst Case 2ndHarmonic ............
PortlInputWorstCase3rdHarmonic.
............
Port2InputWorstCase2ndHarmonic
............
Port 2 Input Worst Case 3rd Harmonic
.............
17. Test Port Output/Input Harmonics (Option 002 Analyzers with
Option 006 only)......................
Test Port Output Worst Case 2nd Harmonic
..........
Test Port Output Worst Case 3rd Harmonic
..........
Port 1 Input Worst Case 2ndHarmonic ............
PortlInputWorstCase3rdHarmonic.
............
Port2InputWorstCase2ndHarmonic
............
Port2InputWorstCase3rdHarmonic.
............
18. Test Port Output Harmonics (Analyzers without Option 002)
.
Procedure..........................
Performance ‘lkst Record
For Analyzers with a Frequency Range of 30 kHz to 3 GHz
....
Performance ‘l&t Record
For Analyzers with a Frequency Range of 30 kHz to 6 GHz
....
Adjustments and Cmmction Constants
Post-Repair Procedures for HP 8753E
..............
A9 Switch Positions
......................
Source Default Correction Constants (Test 44)
..........
Source Pretune Default Correction Constants (Test 45)......
Analog Bus Correction Constants (Test 46)
............
Source Pretune Correction Constants (Test 48)
..........
RF Output Power Correction Constants (Test 47)
.........
Power Sensor Calibration Factor Entry
............
IF Arnphfier Correction Constants (Test 51)
...........
ADC Offset Correction Constants (Test 52)
............
Sampler Magnitude and Phase Correction Constants (Test 53)
...
Power Sensor Calibration Factor Entry
............
Determine the Insertion Loss of the Cable at 1
GHz
......
Sampler Correction Constants Routine
............
2-94
2-95
2-96
2-97
2-97
2-99
2-99
2-100
2-101
2-102
2-103
2-104
2-105
2-105
2-106
2-107
2-108
2a-1
2b-1
3-2
3-5
3-7
3-8
3-9
3-10
3-11
3-12
3-16
3-17
3-18
3-19
3-20
3-21
Contents4

Cavity Oscillator Frequency Correction Constants (Test 54) ....
3-28
Spur Search Procedure with a Filter ............. 3-30
Spurs Search Procedure without a Filter
...........
3-31
Serial Number Correction Constants (Test 55) .......... 3-34
Option Numbers Correction Constants (Test 56)
......... 3-36
Initialize EEPROMs (Test 58)
..................
3-37
EEPROM Backup Disk Procedure ................ 3-38
Correction Constants Retrieval Procedure ............ 3-40
LoadingFirmware.. .....................
3-41
LoadingFirmwareintoanExistingCPU.
...........
3-41
In Case of Difficulty
....................
3-42
LoadingFirmwareintoaNewCPU
.............. 3-43
In Case of DifficuIty
....................
3-43
Fractional-N Frequency Range Adjustment
........... 3-45
Frequency Accuracy Adjustment
................ 3-48
Instruments with Option ID5 only
..............
3-51
In Case of Difficulty
.....................
3-51
High/Low Band Transition Adjustment
............. 3-52
Fractional-N Spur Avoidance and FM Sideband Adjustment ....
3-54
Source Spur Avoidance Tracking Adjustment
..........
3-58
Unprotected Hardware Option Numbers Correction Constants . .
3-60
Sequences for Mechanical Adjustments
.............
3-62
How to Load Sequences from Disk
...............
3-62
How to Set Up the Fractional-N Frequency Range Adjustment . .
3-63
How to Set Up the High/Low Band Transition Adjustments ....
3-63
How to Set Up the Fractional-N Spur Avoidance and FM Sideband
Adjustment
........................
3-64
Sequence Contents
....................... 3-64
Sequence for the High/Low Band Transition Adjustment ....
3-64
Sequences for the Fractional-N Frequency Range Adjustment .
.
3-65
Sequences for the Fractional-N Avoidance and FM Sideband
Adjustment
....................... 3-66
4. Staxt Troubleshooting Here
Assembly Replacement Sequence
................
Having Your Analyzer Serviced
.................
Step 1. Initial Observations ...................
Initiate the Analyzer Self-Test
................
Step 2. Operator’s Check ....................
Description
.........................
Procedure ..........................
4-2
4-2
4-3
4-3
4-4
4-4
4-4
Contents-5

Step 3. HP-IB Systems Check
.................. 4-6
If Using a Plotter or Printer .................
4-7
IfUsinganExternaiDiskDrive.
............... 4-7
Troubleshooting Systems with Multiple Peripherals
....... 48
Troubleshooting Systems with Controllers
...........
4-8
Step 4. Faulty Group Isolation .................
4-9
Power Supply
.........................
4-10
Check the Rear Panel LEDs
..................
4-10
Check the A8 Post Regulator LEDs
.............. 4-10
Digital Control
.........................
4-11
Observe the Power Up Sequence ...............
4-11
Verify IntemaI Tests Passed
..................
4-12
Source
............................
4-13
Phase Lock Error Messages
.................. 413
Check Source Output Power
.................
4-13
No Oscilloscope or Power Meter? Try the ABUS
........ 4-15
Receiver ...........................
4-16
ObservetheAandBInputTraces
..............
4-16
Receiver Error Messages
...................
4-17
Faulty Data .........................
4-17
Accessories
..........................
4-18
Accessories Error Messages
..................
4-18
5. Power Supply Troubleshooting
Assembly Replacement Sequence
................
5-2
Simplified Block Diagram
....................
5-3
StartHere.
.......................... 54
Check the Green LED and Red LED on Al5 .......... 54
Check the Green LEDs on A8
................. 5-5
Measure the Post Regulator Voltages .............
5-5
If the Green LED of the Al5 Is not ON Steadily .........
5-7
Check the Line Voltage, Selector Switch, and Fuse ....... 5-7
IftheRedLEDoftheA15IsON
................
5-8
Check the A8 Post Regulator .................
5-8
Verify the Al5 Preregulator ................. 5-9
Check for a Faulty Assembly ................. 5-11
Check the Operating Temperature .............. 5-13
Inspect the Motherboard ...................
5-13
IftheGreenLEDsoftheABarenotalION ........... 5-14
Remove AS, Maintain A15Wl Cable Connection ........
5-14
Check the A8 Fuses and Voltages ...............
5-14
Contents-6

Remove the Assemblies ................... 5-15
Briefly Disable the Shutdown Circuitry ............ 5-16
Inspect the Motherboard ................... 5-18
Error Messages
Check the Fuses and Isolate .A8 . 1 : 1 . 1 1 1 : 1 : 1 1 1 : 1
5-19
5-20
Pan Troubleshooting ......................
5-22
Fan Speeds .........................
5-22
Check the Pan Voltages ....................
5-22
Short ABTP3 to Ground ...................
5-22
Intermittent Problems .....................
5-23
6. Digital Control Troubleshooting
Digital Control Group Block Diagram ......
Assembly Replacement Sequence ........
CPU Troubleshooting (A9) ...........
A9 CC Switch Positions ............
Checking A9 CPU Red LED Patterns .....
Display Troubleshooting (A2, A18, A19, A27) . .
Evaluating your Display ...........
Backlight Intensity Check .........
Red, Green, or Blue Pixels Specifications . .
Dark Pixels Specifications .........
Newton’s Riis ..............
Troubleshooting a White Display .......
Troubleshooting a Black Display .......
Troubleshooting a Display with Color Problems
Front Panel Troubleshooting (Al, A2) ......
Check Front Panel LEDs After Preset .....
Identify the Stuck Key ............
Inspect Cables ................
Test Using a Controller ............
Run the Internal Diagnostic Tests ........
If the Fault Is Intermittent ...........
Repeat Test Function .............
HP-IB Failures .................
........ 6-2
........ 6-3
........ 64
........ 6-4
........ 6-5
........ 6-7
........ 6-7
........ 6-8
........ 6-9
........ 6-10
........ 6-10
........
6-12
........
6-12
........
6-12
........
6-13
........ 6-13
........
6-14
........ 6-16
........
6-16
........ 6-17
........
6-19
........ 6-19
........ 6-19

7. Source Troubleshooting
Assembly Replacement Sequence ................ 7-2
Before You Start Troubleshooting ................ 7-2
Power. ............................ 7-3
1. Source Default Correction Constants (Test 44) ........
7-3
2. RF Output Power Correction Constants (Test 47) ...... 7-3
3. Sampler Magnitude and Phase Correction Constants (Test 53) 7-3
Phase Lock Error ....................... 7-4
Phase Lock Loop Error Message Check ............ 74
A4 Sampler/Mixer Check ................... 7-6
A3 Source and All Phase Lock Check ............ 7-8
YO Coil Drive Check with Analog Bus ............ 7-11
YO Coil Drive Check with Oscilloscope ...........
7-12
Al2 Reference Check .................... 7-13
Analog Bus Method ....................
7-13
Oscilloscope Method ....................
7-15
1OOkHzPulses ......................
7-16
PLREF Waveforms .....................
7-17
REFSiiAtAllTP9. .................
7-17
HighBandREFSii ..................
7-17
LowBandREFSiial ..................
7-18
FNLOatA12Check. ...................
7-19
4 MHz Reference Signal ..................
7-20
2ND LO Waveforms ....................
7-21
90 Degree Phase Offset of 2nd LO Signals in High Band . .
7-21
InPhase2ndLOSignalsinLowBand ...........
7-21
Al2 Digital Control Siials Check ..............
7-23
LENREFLine ......................
7-23
LHBandLLBLines. ..................
7-24
A13/A14 Fractional-N Check .................
7-24
Fractional-N Check with Analog Bus ............
7-24
Al4 VCO Range Check with Oscilloscope ..........
7-25
Al4 VCO Exercise .....................
7-27
Al4 Divide-by-N Circuit Check ...............
7-29
A14-to-Al3 Digital Control Siials Check. ..........
7-29
HMBLine .......................
7-31
A7 Pulse Generator Check ..................
7-32
A7 Pulse Generator Check with Spectrum Analyzer .....
7-32
Rechecking the A13/A14 Fractional-N ............
7-33
A7 Pulse Generator Check with Oscilloscope .........
7-34
All Phase Lock Check ....................
7-35
Contents-8

Phase Lock Check with PLL DIAG
.............
7-36
Phase Lock Check by Signal Examination
..........
7-36
Source Group Troubleshooting Appendix ............
7-38
Troubleshooting Source Problems with the Analog Bus
.....
7-38
Phase Lock Diagnostic Tools
.................
7-38
Phase Lock Error Messages
.................
7-38
Phase Lock Diagnostic Routines
...............
7-39
Broadband Power Problems
.................
7-39
8. Receiver Troubleshooting
Assembly Replacement Sequence ................
8-2
Receiver Failure Error Messages ................
8-3
ChecktheAandBInputs
................... 8-4
Troubleshooting When AU Inputs Look Bad ...........
8-6
RunIntemalTests18and17 .................
8-6
Check 2nd LO
........................
8-6
Checkthe4MHzREFSiiaI ..................
8-7
Check A10 by Substitution or SiiaI Examination .......
8-8
Troubleshooting When One or More Inputs Look Good ......
8-11
Checkthe4kHzSiial.
...................
8-11
Check the Trace with the Sampler Correction Constants Off . .
8-12
Check 1st I.0 Siial at Sampler/Mixer .............
8-14
Check 2nd LO Signal at Sampler/Mixer ............
8-14
9. Accessories Troubleshooting
Assembly Replacement Sequence
................
Inspect the Accessories
.....................
Inspect the Test Port Connectors and Calibration Devices
....
Inspect the Error Terms
....................
Cable Test
..........................
Verify Shorts and Opens
...................
9-2
9-3
9-3
9-3
9-5
9-6
10. Service Key Menus and Error Messages
Service Key Menus.
......................
10-l
Error Messages
........................
10-l
Service Key Menus
.
Internal Diagnostics
............
lo-2
Tests Menu
.........................
10-3
Test Options Menu
......................
lo-5
Self Diagnose Softkey .................... lo.7
Test Descriptions. ......................
lo-7
Internal Tests
.......................
lo-7
Contents-9

External Tests
.......................
System Verification Tests
..................
Adjustment Tests
.....................
Display Tests
.......................
Test Patterns .......................
Service Key Menus - Service Features
..............
Service Modes Menu
.....................
Service Modes More Menu
..................
Analog Bus
.........................
Description of the Analog Bus
...............
TheMainADC.
......................
The Frequency Counter ..................
Analog In Menu
.......................
Analog Bus Nodes
......................
A3 Source.........................
A10 Digital IF.......................
All Phase Lock......................
A12 Reference.......................
Al4 Fractional-N (Digital)
.................
PEEK/POKE Menu
......................
Firmware Revision Softkey
...................
HP-IB Service Mnemonic Deiinitions
..............
Invoking Tests Remotely
...................
Analog Bus Codes
......................
Error Messages
........................
11. Error lkrms
Error Terms Can Also Serve a Diagnostic Purpose
........
FuII Two-Port Error-Correction Procedure............
Error l&m Inspection.....................
If Error Terms Seem Worse than Typical Values
........
Uncorrected Performance ..................
Error
Term Descriptions....................
Directivity (EDF and EDR)
..................
Description
........................
Significant System Components...............
Affected Measurements
...................
Source Match (ESF and ESR)
.................
Description
........................
Significant System Components...............
Affected Measurements
..................
10-11
10-12
10-13
10-15
lo-16
10-18
lo-18
10-21
10-22
lo-22
lo-23
lo-23
lo-24
lo-26
lo-26
lo-33
lo-34
10-40
1043
1046
lo-47
lo-48
1048
1049
10-50
11-l
11-3
11-8
11-9
11-9
11-10
11-11
11-11
11-11
11-11
11-12
11-12
11-12
11-12
Contents-l 0

Reflection Tracking (ERF’ and ERR)
..............
11-13
Description ........................
11-13
Significant System Components...............
11-13
Affected Measurements
..................
11-13
Isolation (Crosstalk, EXF and EXR)
..............
11-14
Description ........................
11-14
Significant System Components...............
11-14
Affected Measurements
..................
11-14
LoadMatch(ELF’andELR).
.................
11-15
Description ........................
11-15
Significant System Components...............
11-15
Affected Measurements
..................
11-15
Transmission Tracking (ETF and ETR)
.............
11-16
Description ........................
11-16
Significant System Components...............
11-16
Affected Measurements
..................
11-16
12. Theory of Operation
How the HP 8753E Works
...................
12-1
The Built-In Synthesized Source
...............
12-2
The Source Step Attenuator................
12-2
The Built-In Test Set
.....................
12-3
The Receiver Block
.....................
12-3
The Microprocessor
....................
12-3
Required Peripheral Equipment
................
12-3
A Close Look at the Analyzer’s Functional Groups
........
12-4
Power Supply Theory
.....................
12-5
Al5 PrereguIator
......................
12-5
Line Power Module
....................
12-6
Preregulated Voltages
...................
12-6
Regulated +5 V Digital Supply ...............
12-6
Shutdown Indications: the Green LED and Red LED
.....
12-6
A8 Post Regulator
......................
12-7
Voltage Indications: the Green LEDs ............
12-7
Shutdown Circuit
.....................
12-7
Variable Pan Circuit and Air Flow Detector .........
12-7
Display Power
.......................
12-8
Probe Power
.......................
12-8
Digital Control Theory
.....................
12-8
Al Front Panel .......................
12-10
A2 Front Panel Processor...................
12-10
Contmte11

A9 CPU/A10 Digital IF ....................
12-10
Main CPU
.........................
12-10
MainRAM. ........................
12-11
EEPROM
.........................
12-11
Digital SiiaI Processor
..................
12-11
Al8 Display
.........................
12-11
A19 GSP
..........................
12-12
A27 Inverter ........................
12-12
Al6 Rear Panel
.......................
12-12
Source Theory Overview
....................
12-14
A14/A13 Fractional-N
....................
12-14
Al2 Reference ........................
12-14
A7 Pulse Generator .....................
12-15
All Phase Lock .......................
12-15
A3 Source
..........................
12-15
Source Super Low Band Operation
...............
12-15
Source Low Band Operation
..................
12-16
Source High Band Operation
..................
12-19
Source Operation in other Modes/Features
............
12-22
Frequency Offset
......................
12-22
Harmonic Analysis (Option 002)
................
12-22
External Source Mode
....................
12-23
Tuned Receiver Mode
....................
12-25
Signal Separation
.......................
12-26
TheBuiIt-InTestSet .....................
12-26
A21 andA22’IWPortCouplers
..............
12-26
A23LEDFrontPanel
...................
12-26
A24 Transfer Switch ....................
12-26
A25 Test Set Interface ...................
12-26
Receiver Theory
........................
12-28
A4lA5lA6 Sampler/Mixer
...................
12-29
TheSamplerCircuitinHighBand.
.............
12-29
The Sampler Circuit in Low Band or Super Low Band
....
12-29
The2ndLOSignaI .....................
12-29
The Mixer Circuit
.....................
12-30
AlODi@talIF ........................
12-30
Contents-12

13. Replaceable parts
Replacing an Assembly
.....................
Rebuilt-Exchange Assemblies ..................
Ordering Information
.....................
Replaceable Part Listings
....................
Major Assemblies, ‘Ibp
....................
Major Assemblies, Bottom ..................
Cables, Top
.........................
Cables, Bottom
.......................
Cables, Front
........................
Cables, Rear
.........................
Cables, Source
........................
F’ront Panel Assembly, Outside ................
kont Panel Assembly, Inside .................
Rear Panel Assembly
.....................
Rear Panel Assembly, Option lD5 ...............
Hardware, Top. .......................
Hardware, Bottom
......................
Hardware, Front
.......................
Hardware, Test Set Deck
...................
Hardware, Disk Drive Support ................
Hardware, Memory Deck
...................
Hardware, Preregulator ...................
Chassis Parts, Outside
....................
Chassis Parts, Inside
.....................
Miscellaneous
........................
13-2
13-3
13-3
13-5
13-6
13-8
13-10
13-12
13-14
13-16
13-18
13-20
13-22
13-24
13-26
13-28
13-30
13-32
13-34
13-36
13-38
13-40
1342
1344
1346
14.
Assembly Replacement and Post-Repair Procedures
Replacing an Assembly
.....................
14-2
Procedures described in this chapter .............
14-3
LineFuse ........................... 144
Tools Required
........................
14-4
Removal
.......................... 144
Replacement
........................ 144
Covers
............................
14-6
Tools Required
........................ 14-6
Removing the top cover
...................
14-6
Removing the side covers
.................. 146
Removing the bottom cover
................. 14-6
Front Panel Assembly
..................... 14-8
Tools Required
........................ 148
Contents-13

Removal
.......................... 14-8
Replacement
........................ 14-8
Front Panel Keyboard and Interface Assemblies (Al, A2)
.....
14-10
Tools Required
........................ 14-10
Removal
..........................
14-10
Replacement
........................ 14-10
Display Lamp and Inverter Assemblies (A18, A27)
........
14-12
‘Ibols Required
........................
14-12
Removal
.......................... 14-12
Replacement
........................
14-13
Rear Panel Assembly
...................... 1416
‘Ibois Required
........................ 14-16
Removal
..........................
14-16
Replacement
........................
14-17
Rear Panel Interface Board Assembly (A16)
........... 14-20
‘Ibols Required
........................
14-20
Removal
..........................
14-20
Replacement
........................
14-20
A3 Source Assembly
......................
14-22
Tools Required
........................ 1422
Removal
.......................... 1422
Replacement
........................
14-24
A4, A5, A6 Samplers and A7 Pulse Generator .......... 1426
Tools Required
........................
14-26
Removal
..........................
14-26
Replacement
........................
14-28
AS, AlO, All, A12, A13, Al4 Card Cage Boards .........
14-30
lbois Required
........................ 1430
Removal
..........................
14-30
Replacement
........................
14-30
A9 CPU Board
.........................
14-32
Tools Required
........................
14-32
Removal
..........................
14-32
Replacement
........................
14-32
A9BTl Battery ........................
14-36
Tools Required
........................
14-36
Removal
..........................
14-36
Replacement
........................
14-36
Al5 Preregulator .......................
14-38
Tools Required
........................
14-38
Removal
.......................... 1438
Contents-14

Replacement
........................ 14-38
Al7 Motherboard Assembly
..................
14-40
Tools Required
........................ 14-40
Removal
.......................... 14-40
Replacement
........................ 14-43
A19 Graphics Processor
....................1444
Tools Required
........................1444
Removal
..........................1444
Replacement
........................1444
A20 Disk Drive Assembly
...................
1446
Tools Required
........................
14-46
Required Diskette
......................
1446
Prehminary Instructions
...................
14-46
Install the replacement disk drive. ..............
14-48
Test the disk-eject function, and adjust if required. ......
1448
Reinstall the covers.
.....................
1449
A21, A22 Test Port Couplers
..................
14-50
Tools Required
........................ 14-50
Removal
..........................
14-50
Replacement
........................
14-50
A23 LED Board
........................
14-52
Tools Required........................
14-52
Removal
..........................
14-52
Replacement
........................
14-52
A24 Transfer Switch......................
14-54
Tools Required
........................
14-54
Removal
..........................
14-54
Replacement
........................
14-54
A25 Test Set Interface.....................
1456
Tools Required
........................1456
Removal
..........................
1456
Replacement
........................
1456
A26 High Stability Frequency Reference (Option lD5) Assembly
.
14-58
Tools Required
........................
14-58
Removal
..........................
14-58
Replacement
........................
14-58
Bl Fan Assembly .......................
14-60
Tools Required
........................
14-60
Removal
..........................
14-60
Replacement
........................1460
Post-Repair Procedures for HP 8753E.............. 1462
Contents-l 5