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Keysight N8973B User Manual
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170
Keysight NF
A Serie
s Noise Figur
e Ana
lyzers Service Guide
RF Section Tr
oubleshooting (N8973B, 74B,
75B Analyzers)
Tr
oubleshooting
Disconnect cable W15 or W36 at A13J7, 322.5 MHz output on the Fr
ont End
Assembly
(1)
. See
Figure 4-19
.
Figur
e 4-19
W15 or W36 Location
169
171
Table of Contents
Default Chapter
1
Noise Figure Analyzers
1
Safety Notices
2
Table of Contents
5
1 Overview
13
What You will Find in this Chapter
13
Keysight NFA Series Noise Figure Analyzer Overview
14
Analyzer Accessories
15
Manual Set on CD/DVD
15
50 Ohm Load
16
50 Ohm/75 Ohm Minimum Loss Pad
16
AC Probe
16
AC Probe (Low Frequency)
16
Broadband Preamplifiers and Power Amplifiers
16
RF and Transient Limiters
16
Power Splitters
17
Static Safe Accessories
17
Before You Start Troubleshooting
18
Lithium Battery Disposal
19
ESD Information
20
Protection from Electrostatic Discharge
20
Handling of Electronic Components and ESD
21
Test Equipment Usage and ESD
21
For Additional Information about ESD
21
Service Equipment You will Need
22
Calibration Application Software
22
Front End Controller Troubleshooting Kit
23
USB Keyboard and Mouse
24
USB Storage Device
24
Required Test Equipment List
25
After an Instrument Repair
37
Contacting Keysight Technologies
38
Instrument Serial Numbers
41
How to Return Your Instrument for Service
42
Service Order Number
42
Original Packaging
42
Other Packaging
43
2 Boot up and Initialization Troubleshooting
45
What You will Find in this Chapter
45
Check the Basics
46
Instrument Boot up Process
47
Typical Instrument Boot-Up Process Flow
49
Potential Problems During Boot Process
52
Yellow Standby LED Does Not Illuminate
52
Green Power on LED Does Not Illuminate
54
Fan(S) Are Not Operating
56
No Keysight Splash Screen Displayed
58
Instrument Hangs at the Keysight Splash Screen
59
PCI Enumeration Error
59
Instrument Cannot Completely Load or Run the Operating System
60
Troubleshooting a Blank Display
60
Verify Video Signal Path Integrity
61
Video Controller / Touch Screen Display Troubleshooting
61
Initializations DID Not Complete
61
Fails an Initial Alignment
62
Signal Level Verification
66
Signal Level Problem with Input Frequencies < 3.6 Ghz
66
Signal Level Problem with Input Frequencies > 3.6 Ghz
67
3 Instrument Messages
69
Introduction
69
Event Vs. Condition Messages
69
Event and Condition Categories
70
Event Message Format
71
Event Queues
72
Advisory Messages
74
Event Messages
80
800, Operation Complete Event
81
700, Request Control Event
81
600, User Request Event
81
500, Power on Event
81
-400 to -499, Query Errors
81
-300 to -399, Device-Specific Errors
82
-221 Settings Conflict Errors
85
-200 to -299, Execution Errors
96
-100 to -199, Command Errors
107
Error
109
Condition Messages
110
Condition Errors 1 to 99, Calibration
110
Condition Errors 101 to 199, Measurement Integrity
115
Condition Errors 201 to 299, Signal Integrity
118
Condition Errors 301 to 399, Uncalibrated Integrity
122
Condition Errors 401 to 499, Power
126
Condition Errors 501 to 599, Frequency
126
Condition Errors 601 to 699, Error Summaries
128
Condition Errors 701 to 799, Operation
129
Condition Errors 801 to 899, Temperature
130
4 RF Section Troubleshooting (N8973B, 74B, 75B Analyzers)
133
What You will Find in this Chapter
133
RF Section Description
134
Purpose
134
RF Section Theory of Operation
138
Troubleshooting
142
Quick Check to Verify the Low Band Signal Path
142
Troubleshooting a Low Band Problem
146
Quick Check to Verify High Band RF Path #1
169
Troubleshooting a High Band Problem
173
High Band Preamp (Standard Option P07, P26)
198
High Band Mixing Equations
198
5 RF Section Troubleshooting (N8976B)
199
What You will Find in this Chapter
199
RF Section Description
200
A9 Input Attenuator a
203
A10 Input Attenuator B
203
A11 Low Band Switch
203
A12 YTF Preselector
203
A13 RF Front End Assembly (N8976B)
204
Troubleshooting
206
Quick Check to Verify the Low Band Signal Path
206
Troubleshooting a Low Band Problem
209
Quick Check to Verify High Band RF Path
216
Troubleshooting a High Band Problem
221
6 Front End Control Troubleshooting
229
What You will Find in this Chapter
229
A15 Front End Control Description
230
Purpose
230
A15 Front End Control Assembly Troubleshooting
235
Verifying Input Attenuator A, Input Attenuator B, Low Band Switch Logic and Power Supplies
236
Preselector Tune Output
245
7 Analog/Digital if Troubleshooting
247
What You will Find in this Chapter
247
25 Mhz BW if Section
249
A2 Analog I.F. Assembly Description
249
A2 Analog I.F. Assembly Theory of Operation
250
A2 Analog I.F. Troubleshooting
253
A3 Digital I.F. Assembly Description
260
A3 Digital I.F. Assembly Theory of Operation
261
A3 Digital I.F. Troubleshooting
263
8 L.O. Synthesizer/Reference Troubleshooting
269
What You will Find in this Chapter
269
A14 L.O. Synthesizer Assembly Description
270
Purpose
270
A14 L.O. Synthesizer Theory of Operation
271
Brief Description of the Major Blocks
271
A14 L.O. Synthesizer Troubleshooting
272
Verifying the 4800 Mhz Input Power & Frequency Stability
273
Verifying the 1St L.O. Output Power
276
A16 Reference Assembly Description
280
Purpose
280
A16 Reference Assembly Troubleshooting
282
Diagnostic Leds
289
9 Cpu/Disk Drive Troubleshooting
291
What You will Find in this Chapter
291
A4 Processor Description
292
Disk Drive
292
A4A1 Disk Drive Interface Board
292
Front Panel Interface
292
Graphics Controller
292
Power Supply Control
292
Rear Panel Connectivity
293
System Memory
294
System Processor
294
Processor Battery
294
SD Memory Card Slot
294
A4 Processor Assembly Troubleshooting
295
Boot-Up or Initialization Problems
295
BIOS Settings
295
A5 Disk Drive Description
296
Drive Partitioning
297
Instrument Image Recovery System
298
A5 Disk Drive Troubleshooting
299
Troubleshooting Software Related Issues
299
Reloading the Instrument Application Software
299
Disk Drive Recovery Process
300
Replacing the Instrument Disk Drive
301
10 Power Supply/Midplane Troubleshooting
303
What You will Find in this Chapter
303
A6 Power Supply Description
304
Purpose
304
Power Supply Theory of Operation
305
A6 Power Supply Basic Troubleshooting
310
(Cover On)
310
A7 Midplane Description
312
Purpose
312
A7 Midplane Assembly Troubleshooting
315
11 Front Panel/Motherboard Troubleshooting
317
What You will Find in this Chapter
317
A8 Motherboard Description
318
Purpose
318
A8 Motherboard Troubleshooting
319
A1 Front Panel Assembly
320
A1A2 Front Panel Interface Board
320
A1A3 Lcd
320
12 Block Diagrams
321
What You will Find in this Chapter
321
Block Diagrams
322
RF Lowband Path Block Diagram
323
RF Highband Path #1 Block Diagram
324
RF Highband Path #2 Block Diagram
325
N8976B RF (Low Freq) Block Diagram
326
N8976B RF (Highband Path #1) Block Diagram
327
N8976B RF (Highband Path #2) Block Diagram
328
N8976B RF (Highband Path #3) Block Diagram
329
Reference and Synthesizer Block Diagram
330
25 Mhz Bandwidth I.F. System Block Diagram
331
NFA Computer Block Diagram
332
13 Service and Diagnostics Menus
333
Overview
333
Controlling Access
334
Secure Service Access
335
Service Key Descriptions
339
Timebase
339
Alignments
340
Corrections
344
Band Lock
346
LO Band Lock
347
LO Control
348
Front Panel Key Test
349
Front Panel Display Test
349
Multitouch Test
349
14 Replaceable Parts
351
What You will Find in this Chapter
351
How to Order Parts
352
Replaceable Parts
353
Hardware
364
15 Assembly Replacement Procedures
389
What You will Find in this Chapter
389
Before Starting
390
Safety
390
Tools You will Need
391
Adjustments Tests after an Instrument Repair
391
Major Assembly Locations
392
Instrument Outer Case
393
Standard Instrument
393
Option PRC
395
Top Brace
398
Removal
398
Replacement
398
RF Area (N8973B, 74B, 75B)
399
Low Band Switch - Standard Rf/Microwave Instruments
401
Attenuators - Rf/Microwave Instruments
404
YTF Preselector - Rf/Microwave Instruments
406
RF Area (N8976B)
409
Low Band Switch
411
Attenuators
415
YTF Preselector
417
RF Front End Assembly (N8973B, 74B, 75B)
420
Removal
420
Replacement
421
RF Front End Assembly (N8976B)
422
Removal
422
Replacement
423
Front End Control Assembly
424
Removal
424
Replacement
426
L.O. Synthesizer Assembly
427
Removal
427
Replacement
427
Rear Panel
428
Removal
428
Replacement
428
Reference Assembly
429
Removal
429
Replacement
430
Power Supply Assembly
431
Removal
431
Replacement
432
CPU Assembly
433
Removal
433
Replacement
434
A5 Solid State Drive
435
Disk Drive
435
A4A1 CPU Memory Card
437
Disk Drive Interconnect
437
Analog I.F. (Aif)/Digital I.F. (DIF) Assembly
440
Removal
440
Separate AIF/DIF Assembly
442
Replacement
443
Midplane Assembly
444
Removal
444
Replacement
446
Motherboard Assembly
447
Removal
447
Replacement
450
Fan Assembly
452
Removal
452
Replacement
454
Input Connector Assembly
455
Removal
455
Replacement
456
Front Frame Assembly
457
Removal
457
Replacement
458
Bail Handle Removal (Option PRC)
459
Front Frame Assembly Components
460
Display Assembly
466
16 Post-Repair Procedures
471
What You will Find in this Chapter
471
Before Starting
471
Post-Repair Procedures
472
Additional Tasks
476
17 Functional Tests
487
Functional Test
487
Performance Verification
487
Before Performing a Functional Test
488
Test Equipment
489
Displayed Average Noise Level (DANL)
492
Procedure
492
Frequency Readout Accuracy
495
Procedure
496
Second Harmonic Distortion (SHD)
498
Procedure
499
Amplitude Accuracy at 50 Mhz
501
Procedure
502
Testing Preamp Option (P03, P07, P26, P44)
504
Frequency Response (Flatness)
505
Procedure
506
Frequency Response (Flatness), Preamp on
509
Procedure
510
Scale Fidelity
514
Procedure
515
18 Instrument Software
517
What You will Find in this Chapter
517
Instrument Software Overview
518
Software Licensing
519
Software Updates
520
Instrument Measurement Application Software
520
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Keysight N8973B Specifications
General
Brand
Keysight
Model
N8973B
Category
Measuring Instruments
Language
English
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