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E4448A
Agilent Technologies E4448A Service Guide
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111
5
T
roubleshooting the Synthesizer
Section
110
112
Table of Contents
Table of Contents
5
Overview
13
What You will Find in this Chapter
14
Agilent PSA Series Spectrum Analyzer Overview
15
Instrument Hardware Option Descriptions
16
Before Troubleshooting a Failure
19
ESD Information
19
Service Equipment You will Need
22
Service Kit Parts List
22
Required Test Equipment List
24
Replacement Assemblies
34
Battery Information
36
After an Instrument Repair
36
Contacting Agilent Technologies
37
Instrument Serial Numbers
39
How to Return Your Instrument for Service
40
Overall Troubleshooting What You will Find in this Chapter
44
Check the Basics
45
Troubleshooting Power-Up Problems
46
Troubleshooting an Inoperative Instrument
47
Check the Instrument Setup
47
Initial Checks
47
Troubleshooting Using Auto-Align Tests
49
Quick Cals
52
Isolating the Faulty Assembly When the Displayed Amplitude Is Incorrect or the Instrument Fails a Gain Related Auto Align Test
53
Troubleshooting Using Front Panel Keys
57
Error Messages
57
Using Service Features
58
Using Alignment Features
62
Selecting the Frequency Reference
64
User Diagnostics
64
Restore System Defaults
64
Troubleshooting Performance Test Failures
65
Section 1
70
Troubleshooting the RF Section (E4440A, E4443A, E4445A) What You will Find in this Chapter
70
(E4440A, E4443A, E4445A)
71
RF Section Description
71
RF Section Description (E4440A, E4443A, E4445A)
71
E4440A, E4443A, E4445A
75
Overall Front End
75
RF Assembly Quick Check - E4440A, E4443A, E4445A
75
Verifying a Faulty Front End Assembly
75
A14 and A15 Step Attenuators
76
A21 Switched lo Distribution Amplifier (SLODA)
78
A19 Rythm
80
A18 Yto
81
A20 Lowband
82
A13 Front End Driver
84
A22 Low Band Preamplifier (Option 1DS)
86
A27 Electronic Attenuator Description (Option B7J)
87
Section 2
90
Troubleshooting the RF Section (E4446A, E4447A, E4448A)
90
(E4446A, E4447A, E4448A)
91
RF Section Description (E4446A, E4447A, E4448A)
91
E4446A, E4447A, E4448A
95
Overall Front End
95
RF Assembly Quick Check - E4446A, E4447A, E4448A
95
Verifying a Faulty Front End Assembly
95
A14 and A15 Step Attenuators
96
A21 FELOMA and A29 FELOMA/SBTX Driver
98
A19 SBTX/RYTHM Assembly
101
A18 Yto
103
A20 Lowband
104
A13 Front End Driver
107
A22 Low Band Preamplifier (Option 1DS)
108
A27 Electronic Attenuator Description (Option B7J)
109
Troubleshooting the Synthesizer Section
111
What You will Find in this Chapter
112
A12 Synthesizer Assembly Description
113
Troubleshooting lo and Sampling Oscillator Unlock Conditions
114
Verifying the A12 Synthesizer Board
114
E4440-60049 Extender Board
116
A11 Reference Assembly Description
118
100 Mhz VCXO
119
300 Mhz Outputs
119
50 Mhz Calibrator Output
119
Interconnections to Other Assemblies
119
Reference Unlock Detector
119
Reference Assembly Quick Check
120
Verifying the A11 Reference Board
120
Reference Assembly Detailed Troubleshooting
121
A9 Second Lo/Fan Control Assembly Description
122
Fan Control Circuitry
122
Second lo Circuitry
122
If the Fans Are Not Operating
123
Verifying the A9 2Nd LO/ Fan Control Board
123
Troubleshooting the if Section
125
What You will Find in this Chapter
126
321.4 Mhz Filter
127
50 Mhz Calibrator ALC
127
A10 Third Converter Assembly Description
127
Linearization Circuit
127
Step Attenuator
127
System Variable Gain Compensation Circuitry
127
321.4 Mhz Cal Signal Mixer
128
3Rd Mixer
128
Interconnections to Other Assemblies
128
Third Converter Troubleshooting
129
Verifying the A10 Third Converter Board
129
Verifying the A10 Third Converter Board E4440A, E4443A, E4445A, E4446A, E4448A)
129
(E4447A)
131
Third Converter Troubleshooting
131
A8 Analog if Assembly Description
133
Main Gain Amplifier
133
Pre-Filters
133
21.4 Mhz Anti-Alias Filter
134
Calibration Generator
134
Clock Generator
134
Fourth L.O
134
Mixer
134
Post down Conversion Filtering
134
Interconnections to Other Assemblies
135
Power Supply Switching Reference
135
Triggering
135
Analog if Assembly Quick Check
136
Verifying the A8 Analog if Assembly Signal Path
136
Analog if Assembly Detailed Troubleshooting
137
7.5 Mhz if
139
A7 Digital if Assembly Descriptions
139
Gain Range Select/Rules
139
Offset Adjust and Dither
139
Interconnections to Other Assemblies
140
Digital if Assembly Quick Check
141
Verifying the A7 Digital if Board
141
Digital if Assembly Detailed Troubleshooting
142
Troubleshooting the Processor, Power Supply, and Display What You will Find in this Chapter
146
A25 Motherboard Description
147
A26 CPU Assembly Description
148
CPU Assembly Quick Check
149
Verifying the A26 CPU Assembly
149
Battery Information
152
CPU Assembly Detailed Troubleshooting
152
A5 Power Supply Assembly Description
153
Isolating an A5 Power Supply Problem
154
Verifying the Individual Voltage Supplies
155
A6 SCSI Interface Board Description
158
A1 LCD Display
159
A2 Front Panel Interface Assembly
159
A23 Disk Drive
159
A3 Keyboard
159
Front Frame Description
159
Isolating a Display Problem
160
Verifying the Inverter Boards
160
Verifying HSYNC, VSYNC, and LCD Clock
162
Rear Panel Description
164
Hardware Options
165
What You will Find in this Chapter
166
Verifying Option 107 Audio Input
167
Verification of Option 107
168
Verification of Option 110
169
Verifying Option 110
169
(All PSA Series)
172
Overview of Option 115 Extended Memory
172
Verification of Option 115
173
Verifying Option 122 or 140, Wide Bandwidth Digitizer
174
Setting up the Instrument in Wideband Mode
175
Setting up the Instrument in Narrow Band Mode
176
If the Problem Only Exists in the Wideband Path
177
Viewing the Wide Band Response to a Comb Signal (Inner Loop Test)
178
Viewing the Wide Band Response to a Comb Signal (Outer Loop Test)
179
Wide Band Analog if Assembly Filter Path Test
181
Option 122 or 140 Lowband Filters
183
Overview and Verification of Option 123, Microwave and Millimeter Preselector Bypass
187
Overview of Option 123 in the E4440A, E4443A, or E4445A
187
Overview of Option 123 in the E4446A, E4447A, or E4448A
197
Procedure 1 - Quick Check of Video out Level
203
Verifying Option 124, Y-Axis Video out
203
Procedure 2 - Detailed View of the Video Signal
204
Block Diagrams What You will Find in this Chapter
208
Signal Mnemonics
209
Overall Block Diagrams
212
Replaceable Parts Lists and Locations
221
What You will Find in this Chapter
222
Replaceable Parts
224
Hardware
249
Assembly Replacement Procedures
305
Section 3
306
What You will Find in this Chapter
306
Before Starting
307
Safety
307
Adjustments after an Instrument Repair
308
Tools You will Need
308
Major Assembly Locations
309
Instrument Outer Case
310
Outer Case
310
Removal
310
Replacement
311
Removal
312
Top Brace
312
Replacement
313
Drop the Front Frame
314
Front Frame
314
Removal
315
Replacement
316
Complete RF Section
317
E4440A, E4443A, E4445A
317
RF Section
317
RF Section and Assemblies (E4440A,E4443A,E4445A)
317
E4440A, E4443A, E4445A
320
RF Assemblies
320
A18 YTO and A19 RYTHM
322
A21 Sloda
323
FL1 Low Pass Filter
323
A20 Lowband
324
FL2 Band Pass Filter
324
E4440A, E4443A, E4445A
325
RF Section Option Assemblies
325
A22 Preamplifier
326
A27 Electronic Attenuator
326
(E4440A, E4443A, E4445A)
327
Option 110 Assemblies
327
A36 Preamplifier
329
Option 123 Assemblies
330
Complete RF Section
336
E4446A, E4447A, E4448A
336
RF Section
336
RF Section and Assemblies (E4446A, E4447A, E4448A)
336
E4446A, E4447A, E4448A
339
RF Assemblies
339
A18 YTO and A19 SBTX/RYTHM
341
A21 Feloma
342
FL1 Low Pass Filter
342
A20 Lowband
343
A20 Lowband (E4446A, E4448A)
343
FL2 Band Pass Filter
343
A20 Lowband (E4447A Only)
344
A29 LOMA/SBTX Driver
345
A29 SBTX Driver Board
345
A30 Fifa
345
E4446A, E4447A, E4448A
346
RF Section Option Assemblies
346
A22 Preamplifier
347
A27 Electronic Attenuator
347
E4446A, E4447A, E4448A
348
Option 110 Assemblies
348
SW4 Millimeter Switch
351
A34 Mixer
352
E4446A, E4447A, E4448A
352
Option 123 Assemblies
352
A35 Mixer Bias Board
353
SW3 Switch
353
SW5 Switch
355
Assembly
357
Attenuator Assembly
357
E4440A, E4443A, E4445A
357
Removal
357
Replacement
358
Attenuator Assembly
359
E4446A, E4447A, E4448A
359
Removal
359
Replacement
360
A5 Power Supply
361
Removal
361
Replacement
362
A39 Usb/Memory Board
363
Removal
363
Replacement
365
A6 SCSI Board
366
A6 SCSI Board (Early Instruments)
366
Removal
366
Replacement
366
(Standard Instrument)
367
Vertical Board Assemblies
367
Removal
371
(E4447A Only)
372
A10 Third Converter Removal Procedure
372
Replacement
372
Fans
374
Fans/MID Web
374
MID-Web and Fan Assemblies
374
MID Web
376
A23 Disk Drive
378
Removal
378
Replacement
381
A25 Motherboard
382
Removal
382
Replacement
384
A26 CPU Assembly
385
Removal
385
Battery Replacement
387
Replacement
387
A26A1 DRAM and A26A2 Flash Boards
388
Removal
388
Replacement
389
Rear Frame
390
Removal
390
Replacement
392
Removal
393
RF Input Connector
393
Replacement
394
Front Frame Subassemblies
395
Front Frame Exploded View
397
A1 Display and Filter
398
A1 LCD Display, Backlights, and Filter
398
A2 Front Panel Interface Board
402
Bezel and Keypad
404
External Trigger Cable
407
Rpg
407
Post-Repair Procedures
409
What You will Find in this Chapter
410
Before Starting
411
Test Equipment You will Need
411
Post-Repair Procedures
412
Burst Trigger Check
419
Internal Front Panel Test
420
28 V Rear Panel Output Check
421
Configuring a Replacement CPU Assembly
422
Description
422
Procedure
422
Configuring a Replacement Flash Memory Assembly
425
Description
425
Equipment Required
425
Procedure
426
Firmware Upgrades
429
Firmware Upgrades Including Measurement Personality Upgrades
430
Other manuals for Agilent Technologies E4448A
User And Programming Guide
434 pages
Installation Guide
40 pages
Manual
382 pages
Getting Started Guide
82 pages
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Agilent Technologies E4448A Specifications
General
Brand
Agilent Technologies
Model
E4448A
Category
Measuring Instruments
Language
English
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