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8560A
HP 8560A Service Manual
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Block Diagram Description
The spectrum analyzer is comprised of the six main sections listed below. See Figure 6-4. The
following descriptions apply to the Simplified Block Diagram and Overall Block Diagram
located at the end of this chapter. Assembly level block diagrams are located in Chapters 7
through 12.
;
RF SECTION
IF SECTION
Figure 6-4. Functional Sections
General Troubleshooting 6-35
239
241
Table of Contents
Table of Contents
6
General Safety Considerations
4
Safety Symbols
4
General Information
19
Manual Organization
19
Recommended Test Equipment
19
Manual Text Conventions
20
Serial Numbers Covered by this Manual
20
Instrument Variations
21
HP 85629B Test and Adjustment Module
24
Service Kit
24
Recommended Test Equipment
24
Electrostatic Discharge
25
Reducing Potential for ESD Damage
25
Static-Safe Accessories
26
Returning Instruments for Service
26
Original Packaging
26
Other Packaging
26
Service Tag
26
HP 8560A Shipping Container and Cushioning Materials
28
Sales and Service Offices
29
Recommended Test Equipment
31
Adjustment Procedures
35
Introduction
35
Safety Considerations
36
Which Adjustments Should be Performed
36
Test Equipment
36
Adjustable and Factory-Selected Components
36
Adjustment Tools
37
Instrument Service Position
37
Display Adjustment
38
IF Bandpass Adjustment
38
IF Amplitude Adjustments
38
DC Log Amplifier Adjustments
38
Sampling Oscillator Adjustment
39
YTO Adjustment
39
First lo Distribution Amplifier Adjustment
39
Adjustable Components (1 of 3)
40
Adjustable Components (2 of 3)
41
Adjustable Components (3 of 3)
42
Factory Selected Components
42
Using the TAM
43
Test Equipment
43
Adjustment Indicator
43
Required Test Equipment for TAM
44
High-Voltage Power Supply Adjustment
46
TAM Adjustments
44
High-Voltage Power Supply Adjustment Setup
46
Display Adjustment
48
Display Adjustment Setup
48
CRT Adjust Pattern
51
A2 Display Adjustment Locations
52
IF Bandpass Adjustment
54
IF Bandpass Adjustment Setup
54
Factory-Selected LC Filter Capacitors
56
LC Factory-Selected Capacitor Selection
56
Factory-Selected XTAL Filter Capacitors
57
XTAL Factory-Selected Capacitor Selection
57
Capacitor Part Numbers
58
IF Amplitude Adjustments
59
IF Amplitude Adjustment Setup
59
IF Amplitude Adjustment Locations
60
DC Log Amplifier Adjustments
63
Sampling Oscillator Adjustment
67
Sampler Adjustment Setup
67
Coarse-Tune Adjustment Setup
69
Sampling Adjustments
70
YTO Adjustment
71
First lo Distribution Amplifier Adjustment
74
First lo Distribution Amplifier Adjustment Setup
74
Tracking Generator Power Level Adjustments
76
Tracking Generator Power Level Adjustments Setup and Adjustment
77
Tracking Generator Power Level Adjustments
77
10. Frequency Response Adjustment
79
Frequency Response Adjustment Setup
79
10. Frequency Response Adjustment
81
11. Calibrator Amplitude Adjustment
82
Calibrator Amplitude Adjustment Setup
82
Mhz Frequency Reference Adjustment Setup
84
Mhz Reference Adjustment (Non-Option 003 Only)
84
13. Demodulator Adjustment
86
Demodulator Adjustment Setup
86
14. External Mixer Bias Adjustment
89
External Mixer Bias Adjustment Setup
89
15. External Mixer Amplitude Adjustment
91
External Mixer Amplitude Adjustment Setup
91
16. Second if Gain Adjustment
94
A15U802 Values
96
17. Signal ID Oscillator Adjustment
97
Signal ID Oscillator Adjustment Setup
97
18. 600 Mhz Amplitude Adjustment
100
Mhz Reference Adjustment (Option 003)
102
Mhz Reference Adjustment (Option 003)/Setup and Adjustment Location
103
Tracking Oscillator Adjustment (Option 002)
105
Tracking Oscillator Adjustment Setup
106
Tracking Oscillator Range Centering
107
Assembly Replacement
108
Access to Internal Assemblies
109
Access to Internalassemblies
109
Cable Color Code
109
Procedure 1. Analyzer Cover
110
Hinged Assemblies
110
Procedure 2. al Front Frame/Al8 CRT
112
Procedure 3. Alal Keyboard/Front Panel Keys
118
Procedure 4. Ala RPG
119
Procedure 5. A2, A3, A4, and A5 Assemblies
121
A2, A3, A4, and A5 Assembly Removal
121
Assembly Cables (1 of 2)
122
Assembly Cables (2 of 2)
123
Coaxial Cable Clip
124
HP-IB and Alal Wl Cable Placement
125
Procedure 6. A6 Power Supply Assembly
126
A6 Power Supply Connections
127
Power Supply Cover
128
Procedure 7. A6Al High Voltage Assembly
129
Al7 CRT Driver Mounting Screws
130
Procedure 8. A7 through Al3 Assemblies
132
Assembly Locations
133
RF Section Bias Connections
134
A7 1St lo Distribution Amplifier
135
A8 Low Band Mixer
136
A9 Input Attenuator
137
A9 Mounting Screws at Right Frame
137
A10 Tracking Generator (Option 002)
138
A10 Tracking Generator
138
A10 Tracking Generator Mounting Screws
138
Allyto
139
All YTO
139
All Mounting Screws
139
Al3 Second Converter
140
Procedure 9. Al4 and Al5 Assemblies
141
Al4 and Al5 Assembly Removal
141
Al4 and Al5 Assembly Cables
143
Procedure 10. Al7 CRT Driver
144
Al7 Mounting Screws
144
Procedure 11. Bl Fan
145
Procedure 12. Btl Battery
146
Procedure 13. Rear Frame/Rear Dress Panel
147
Main Deck Screws
148
Procedure 14. W3 Line Switch Cable
151
W3 Dress and Connection to A6 Power Supply
152
Line Switch Mounting Screw and Cable Dress
153
W3 Cable Connector
154
Side Frame Mounting Screws
156
Procedure 15. EEROM (A2U501)
157
A21 OCXO Mounting Screws
158
Procedure 16. A21 OCXO (Option 003)
158
Replaceable Parts
159
Ordering Information
159
Direct Phone-Order System
160
Parts List Format
160
Firmware-Dependent Part Numbers
160
Reference Designations, Abbreviations and Multipliers (1 of 4)
161
Reference Designations, Abbreviations, and Multipliers (2 of 4)
162
Reference Designations, Abbreviations, and Multipliers (3 of 4)
163
Reference Designations, Abbreviations, and Multipliers (4 of 4)
164
Manufacturers Code List (1 of 3)
165
Replaceable Parts
177
Major Assembly and Cable Locations
196
Default Chapter
196
Introduction
196
Hinged Assemblies
199
Top View (A2 Unfolded)
199
Top View (A2 and A3 Unfolded)
200
Top View (A2, A3, A4, and A5 Unfolded)
201
Bottom View (Al5 Unfolded)
202
Bottom View (Al5 and Al4 Unfolded)
203
Front End
204
Rear View
205
General Troubleshooting
206
Introduction
206
Assembly Level Text
206
Block Diagrams
206
Assembly Test Points
207
Pad
207
Ribbon Cables
207
Test Jack
207
Ribbon Cable Connections (1 of 2)
209
WR PROT/WR ENA Softkey Menus
211
WR ENA Softkey Menu
212
Troubleshooting to a Functional Section
213
Assemblies
214
Alal Keyboard
214
A2 Controller
214
A3 Interface
214
A4 Log Amplifier/Cal Oscillator
214
A6 Power Supply
214
A8 Low Band Mixer
214
A10 Tracking Generator
214
Using the TAM
215
Diagnostic Functions
215
Revision Connectors
216
TAM Requirements
216
Test Connectors
216
Adc/Interface Check
217
Automatic Fault Isolation
217
Blank Display
217
Controller Check
217
Display/Power Supply
217
Erroneous Results
217
Inconsistent Results
217
IF/LOG Check
218
LO Control Check
218
Manual Probe Troubleshooting
218
RF Check
218
Cal Osc. Troubleshooting Mode
219
Error Messages
220
Viewing Multiple Messages
220
Error Message Elimination
221
System Analyzer Programming Errors (100 to 150)
221
ADC Errors (200 to 299)
222
LO and RF Hardware/Firmware Failures (300 to 399)
223
Roller PLL Errors (302 to 316)
223
YTO Loop Errors (300 to 301)
223
Roller Oscillator Errors (321 to 329)
225
YTO Loop Errors (317 to 318)
225
600 Mhz Reference Loop (333)
226
YTO Loop Errors (331)
226
Automatic if Errors (400 to 599)
227
Sampling Oscillator (335)
227
YTO Leveling Loop (334)
227
Digital and Checksum Errors (700 to 799)
236
EEROM Checksum Errors (700 to 704)
236
System Errors (600 to 651)
236
Program ROM Check-Sum Errors (705 to 710)
237
Battery Problem (718)
238
Microprocessor Error
238
RAM Check Errors (711 to 719)
238
Model Number Error (719)
239
System Errors (750 to 757)
239
Option Module Errors (800 to 899)
239
User-Generated Errors (902 to 904)
239
Block Diagram Description
240
Functional Sections
240
A7 Loda
241
A8 Low Band Mixer
241
A9 Input Attenuator
241
Al3 Second Converter
241
Al4 Frequency Control
241
Al5 RF
241
All YTO
241
Allyto
241
RF Section
241
A15Al Second if Distribution Amplifier (P/O A15)
242
Al3 Second Converter
242
Flatness Compensation Amplifiers (P/O A15)
242
Sweeping the First lo
242
Synthesizer Section
242
Third Converter (P/O A15)
242
Offset Lock Loop (P/O A15)
243
Reference PLL (P/O A15)
243
YTO PLL (A7, All, P/O A14, P/O A15)
243
A4 LOG Amplifier/Cal Oscillator Assembly
244
IF Section
244
Phase Lock Loops
244
Roller Oscillator PLL (P/O A14)
244
A5 if Assembly
245
Adc/Interface Section
246
Adc
247
Controller Section
247
Log Expand/Video Functions (P/O A3)
247
Triggering
247
A6 Power Supply
248
Al7 CRT Display Driver
248
Display ASM
248
Display/Power Supply Section
248
Eerom
248
Firmware
248
Table of Contents
254
Troubleshooting Using the TAM
257
Automatic Fault Isolation
257
Automatic Fault Isolation References
258
TAM Tests Versus A3 Test Connectors
259
Keyboard/Rpg Problems
260
Keyboard Interface
260
Keyboard Matrix
260
RPG Interface
261
Triggering Problems
262
Counter Frequencies
262
Trigger MUX Truth Table
262
Flatness Control (RF Gain Dacs)
264
A3 Assembly's Video Circuits
265
Log Offset/Log Expand
267
Video MUX
268
Video Filter
268
Video Filter Buffer Amplifier
269
A3U102 Latch Outputs
269
Positive/Negative Peak Detectors
270
Peak Detector Reset
271
Rosenfell Detector
271
HMUX-Selo/L Versus Detector Mode
271
Adc Mux
272
Logic Levels at A3U108
273
Variable Gain Amplifier (VGA)
274
Track and Hold
274
A3 Assembly's ADC Circuits
275
ADC Control Signals
275
ADC Start/Stop Control
276
Adc
277
Ramp Counter
278
A3 Assembly's Control Circuits
279
Analog Bus Drivers
279
Analog Bus Timing
280
Demultiplexer A3U410 Truth Table
281
Demultiplexer A3U500 Truth Table
281
Interface Strobe Select
281
The if Section Contains the A4 Log Amplifier/Cal Oscillator and A5 if Assemblies.
283
A4 and A5 Test Connectors
285
IF Section
285
Troubleshooting Using the TAM
285
Automatic Fault Isolation References
286
Troubleshooting A4 Log Amplifier with the TAM
286
Troubleshooting A5 with the TAM
286
TAM Tests Versus Test Connectors (1 of 2)
287
TAM Tests Versus Test Connectors (2 of 2)
288
IF Section Troubleshooting with TAM
289
Troubleshooting A4 Cal Oscillator with the TAM
290
Automatic if Adjustment
291
Parameters Adjusted
292
Requirements
293
Available Reference Level Range
294
Signal Level for Reference Level Display
294
Sweep Width Settings
291
Performance Test Failures
294
IF Gain Uncertainty Performance Test
294
Scale Fidelity Performance Test
295
Resolution Bandwidths Performance Tests
295
Log Amplifier
296
Log Amplifier
297
Linear Amplifiers
297
Video Offset
298
Video Output
298
Frequency Counter Prescaler/Conditioner
299
AM/FM Demodulator
299
4.8 Khz if Filters
299
4.8 Khz and 10.7 Mhz if Filters
300
10.6952 Mhz VCXO
301
Input Switch
301
LO Switch
301
Synchronous Detector
302
Limiter
302
Isolation Amplifier
302
Detector/Mixer
302
Log Gain Compensation
303
Log Offset Compensation
303
Log Offset/Gain Compensation
303
Video Mux
303
A5 if Section
304
IF Signature
305
IF Adjust Signature
308
Detailed if Adjust Signature (3)
308
Detailed if Adjust Signature (5)
309
IF Signature
310
Noisy Signature
310
Common if Signature Problems
310
Noise with Correct Shape
311
Region B Amplitude Variation
311
Region B Amplitude Offset
312
Mhz Resolution Bandwidth Problems
312
Faulty Crystal Short
313
Faulty LC Pole
313
30 Khz Resolution Bandwidth Problems
314
Khz and 10 Khz Resolution Bandwidth Problems
314
Faulty Crystal Symmetry
315
Step Gains
315
A4 Assembly's Cal Oscillator Circuit
316
Cal Oscillator Unlock at Beginning of if Adjust
317
Inadequate CAL OSC AMPTD Range
317
Hz to 3 Khz Resolution Bandwidth out of Specification
318
Output Waveform, 3 Khz Resolution Bandwidth
320
Output Waveform, 1 Khz Resolution Bandwidth
320
Output Waveform, 300 Hz Resolution Bandwidth
321
Failed Crystal Set Symptoms
321
Sweep Generator
322
AM/FM Demodulation, Audio Amplifier, and Speaker
322
Low-Pass Filter
322
Troubleshooting Using the Tam
328
TAM Tests Versus Test Connectors
329
Blank Display
329
Digital Signature Analysis (DSA)
331
Display Problems
331
Line Generators
331
Blanking
332
Line Generator Output Waveforms
332
Blanking Waveforms
333
Display Jumbled or Trace off Screen
334
Expanded Blanking Waveforms
334
Switch Driver Waveform LCHAR
335
Distorted X/Y Line Generator Waveforms
336
Expanded X/Y Line Generator Waveforms
336
Intensity
337
Bad Characters or Graticule
337
Normal X/Y Line Generator Waveforms
337
Long Lines Dimmer than Short Lines
338
Delta X Waveform
338
Analog Zero-Span Problems
339
Delta y Waveform
339
Frequency-Count Marker Problems
340
Frequency Counter
341
Gate Times
341
State- and Trace-Storage Problems
342
Keyboard Problems
343
Caution
345
Confirming a Faulty Synthesizer Section
346
L. Center Frequency Tuning Values
347
L. YTO Loop Test Setup
349
Sampler and Sampling Oscillator Test Setup
350
Sampling Oscillator Test Frequencies
351
Troubleshooting Test Setup
351
Al4 and Al5 Test Connectors
352
Troubleshooting Using the TAM
352
YTO Frequency in TEST Position
352
Automatic Fault Isolation References (1 of 2)
353
Automatic Fault Isolation References (2 of 2)
354
TAM Tests Versus Test Connectors
355
General PLL Troubleshooting
357
PLL Locked at Wrong Frequency
357
Unlocked PLL
357
Unlocked PLL
358
Sweep Signal Destination Versus Span
359
Harmonic Mixing Number Versus Center Frequency
359
Frequency Span Accuracy Problems
359
Determining the First lo Span
359
Confirming Span Problems
360
YTO Main Coil Span Problems (lo Spans >20 Mhz
360
Settings of Sweep Switches
361
YTO FM Coil Span Problems (lo Spans 1.01 Mhz to 20 Mhz
361
Roller Oscillator Span Problems (lo Spans 51 Mhz
362
Input to YTO FM Coil Driver
362
Input to Main/Fm/Vco Sweep Switch
363
Settings of Sweep Switches
363
First lo Span Problems (All Spans)
365
Unlockedyto PLL
367
Operation
367
Troubleshooting an Unlocked YTO PLL
369
Troubleshooting an Unlocked YTO PLL
370
YTO Frequency Errors with A14J23 on Pins 2 and
372
Voltages in FM Coil and Main Loop Drivers
374
Main Coil Coarse and Fine Dacs Voltages
375
Unlocked Roller Oscillator PLL
376
Confirming an Unlocked Condition
376
Operation
376
Offset Oscillator PLL
377
Transfer Oscillator PLL
379
Main Oscillator PLL
381
Operation
383
Troubleshooting
383
Sampling Oscillator PLL Divide Ratios
384
Unlocked Reference PLL
386
Operation
386
Troubleshooting
386
Third lo Driver Amplifier
388
Sampler and Sampler if
389
Sweep Generator Circuit
391
Simplified Sweep Generator
391
Simplified Sweep Generator During Retrace
392
Simplified Synthesizer Section
393
Simplified Al4 Assembly Block Diagram
394
Simplified Al5 Assembly Block Diagram
395
A21 OCXO (Option 003 Only
396
Rf Section
399
Harmonic/Spurious Outputs too High . . . . . . . . . . . . . . . . . 1
399
L. Al4 and Al5 Test Connectors
400
Low Band Problems (50 Hz to 2.9 Ghz)
402
TAM Tests Versus Test Connectors
402
Low Band Problems
403
A7 Loda (lo Distribution Amplifier)
404
A9 Input Attenuator
405
Attenuator Pin Values
405
11-8 RF Section
406
Al3 Second Converter
406
Synthesizer Section
407
Al4 Frequency Control Assembly
407
A7 LODA Drive
407
Al5 RF Assembly
408
Confirming a Faulty Third Converter
408
A7 LODA Drive
408
Confirming Third Converter Output
409
Third Converter
409
Flatness Compensation Control
411
Control Latches
411
SIG ID Oscillator
411
10 Mhz Reference
412
Mhz Reference at A15J302
413
Mhz TTL-Reference at U303 Pin 5
414
RF Section Mnemonic Table
415
A10 Tracking Generator (Option 002)
416
Block Diagram Description
416
Tracking Oscillator
416
Coupler
416
Modulator
416
Output Mixer
416
Pentupler
416
Upconverter
416
Bias Board
417
Output Amplifier
417
Output Goes Unleveled (ERR 900 or ERR 901)
417
Excessive Residual FM
418
Flatness Out-Of-Tolerance
419
Vernier Accuracy Out-Of-Tolerance
419
Harmonic/Spurious Outputs too High
420
No Power Output
421
Power Sweep Not Functioning Properly
421
Display/Power Supply Section
424
L. Simplified Section Block Diagram
425
Wl Power-Cable Connections (1 of 2)
426
Automatic Fault Isolation References
427
Troubleshooting Using the TAM
427
Blank Display
428
Al7 Test Connector
428
TAM Tests Versus Test Connectors . . . .
428
Wl Power-Cable Connections (2 of 2)
427
Blank Display
429
Display Distortion
430
Probe Power Socket
430
Focus Problems
431
Intensity Problems
432
A6 Power Supply Assembly
434
Dead Power Supply
434
Buck Regulator Waveform
435
Line Fuse Blowing
436
Low Voltage Supplies
436
Supply Restarting Every 1.5 Seconds (Kick Start)
436
High Voltage Supplies
437
CRT Supply Dropping out
438
Blanking Signal
438
Buck Regulator Control
439
DC-DC Converter Control
439
Power up
440
A-L. HP 8560A Spectrum Analyzer Documented Assemblies
445
A-3. Al5 RF Assemblies Shipped with HP 8560As Serial Prefixed below 3029A
448
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HP 8560A Specifications
General
Brand
HP
Model
8560A
Category
Measuring Instruments
Language
English
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