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8719ET
Agilent Technologies 8719ET Service Guide
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6-20
Servi
c
e Guid
e
Digital Control T
roub
leshooting
8719ET/20ET/22ET
GPIB
Fai
lures
8719ES/20ES/22ES
RF Netw
ork Anal
yz
ers
Thi
s pa
ge i
nten
tion
all
y l
eft
b
lank
.
206
208
Table of Contents
Default Chapter
5
Table of Contents
5
1 Service Equipment and Analyzer Options
13
Information in this Chapter
14
Service Test Equipment
15
Principles of Microwave Connector Care
18
Analyzer Options
19
Option 1D5, High Stability Frequency Reference
19
Option 004, Step Attenuator (ET Models)
19
Option 007, Mechanical Transfer Switch (es Models)
19
Option 010, Time Domain
19
Option 012, Direct Access Receiver Configuration (es Models)
19
Option 085, High Power System (es Models)
20
Option 089, Frequency Offset Mode (es Models)
20
Option 400, Four-Sampler Test Set (es Models)
20
Option 1CP, Rack Mount Flange Kit with Handles
20
Option 1CM, Rack Mount Flange Kit Without Handles
20
Service and Support Options
21
Option W01
21
Option W31
21
Option W50
21
Option W51
21
Option W32
21
Option W52
21
Option W34
21
Option W54
22
2 System Verification and Performance Tests
23
Sections in this Chapter
24
How to Test the Performance of Your Analyzer
25
ANSI/NCSL Z540-1-1994 Verification
25
Non-ANSI/NCSL Z540-1-1994 Verification
25
Instrument Verification Cycle
26
Preliminary Tests
28
Required Equipment and Tools
28
Check the Temperature and Humidity
28
Clean and Gauge All Connectors
29
Perform the Internal Test
29
Procedure to Perform Operator's Check
30
Check the Test Port Cables
31
System Verification
37
General Information
38
Equipment Initialization
42
Measurement Calibration
44
Verification Device Measurements
47
Performing the Verification Tests
48
If the System Fails the Verification Test
52
Interpreting the Verification Results
53
Performance Tests
55
Frequency Accuracy Performance Test
56
Level Accuracy Performance Test
58
Source Linearity Performance Test
60
Dynamic Range Performance Test
64
Performance Test Record
68
3 Adjustments and Correction Constants
73
Information on this Chapter
74
A7 Switch Positions
76
Source Pretune Correction Constants (Test 43)
78
Analog Bus Correction Constants (Test 44)
80
IF Step Correction Constants (Test 47)
81
ADC Offset Correction Constants (Test 48)
82
Serial Number Correction Constants (Test 49)
83
Protected Option Numbers Correction Constants (Test 50)
85
Unprotected Hardware Option Correction Constants
87
Output Power Adjustments
89
Preparing the Instrument
89
Setting the Main Power DAC to Preset Values
90
Setting the Potentiometers to the Minimum Levels
91
Adjusting the MID Band Power
92
Adjusting the Low Band Power
93
Adjusting the High Band Power (8722ET/ES)
93
Fine Tuning the Flatness
94
Power Linearity Adjustment
96
Preparatory Steps
96
Blanking Adjustment (Test 54)
102
Preparing the Instrument
102
Initialize Eeproms (Test 53)
104
EEPROM Backup Disk Procedure
105
Correction Constants Retrieval Procedure
107
Loading Firmware
108
Loading Firmware into an Existing CPU
108
In Case of Difficulty
108
Loading Firmware into a New CPU
109
Reference Assembly VCO Tune Adjustment
111
Frequency Accuracy Adjustment
113
In Case of Difficulty
115
API Spur Avoidance and 100 Khz FM Sideband Adjustment
116
FM Sideband Adjustment (100 Khz Spurs)
116
API Adjust
118
Raw Offset Correction Constants
120
Raw Offset for the R Channel (ET/ES Models)
121
Raw Offset for the a and B Channels (es Models)
123
Raw Offsets for the a and B Channels (ET Models)
126
Sampler Calibration Correction Constants (Test 51)
130
4 Start Troubleshooting here Information on this Chapter
136
Assembly Replacement Sequence
137
Having Your Analyzer Serviced
138
Step 1. Initial Observations
139
Initiate the Analyzer Self-Test
139
Step 2. Operator's Check
141
Description
141
Procedure to Perform Operator's Check
142
In Case of Difficulty
143
Step 3. GPIB Systems Check
144
If Using a Plotter or Printer
145
If Using an External Disk Drive
145
Troubleshooting Systems with Multiple Peripherals
146
Troubleshooting Systems with Controllers
146
Step 4. Faulty Group Isolation
147
Power Supply Check
148
Check the Rear Panel Leds
148
Check the Post Regulator (A8) Leds
148
Digital Control Check
149
Observe the Power up Sequence
149
Verify Internal Tests Passed
150
Source Check
151
Phase Lock Error Messages
151
Check Source Output Power
152
No Oscilloscope or Power Meter? Try the ABUS
154
Receiver Check
155
Checking the R Channel Output (ET and es Models)
156
Checking the a Channel Output (es Models)
157
Checking the B Channel Output (ET and es Models)
158
Switch Repeatability Check (es Models)
159
Accessories Check
160
5 Power Supply Troubleshooting
167
Information on this Chapter
168
Power Supply Troubleshooting Flowchart
169
Assembly Replacement Sequence
170
Simplified Block Diagram of Power Supply Group
171
Start here
172
Check the Green LED and Red LED on the Preregulator (A15)
172
Check the Green Leds on the Post Regulator (A8)
172
Measure the Post Regulator (A8) Voltages
173
If the Green LED of the Preregulator (A15) Is off or Blinking
174
Check the Line Voltage, Selector Switch, and Fuse
174
If the Red LED of the Preregulator (A15) Is on
175
Check the Post Regulator (A8)
175
Verify the Preregulator (A15)
176
Check for a Faulty Assembly
177
Check the Operating Temperature
178
Inspect the Motherboard
178
If the Green Leds of the Post Regulator (A8) Are Not All on
179
Maintain A15W1 Cable Connection
179
Check the Post Regulator (A8) Fuses and Voltages
179
Remove the Assemblies
180
Briefly Disable the Shutdown Circuitry
181
Inspect the Motherboard
182
Error Messages
183
Check the Fuses and Isolate A8
183
Fan Troubleshooting
184
Fan Speeds
184
Check the Fan Voltages
184
Short A8TP3 to Ground
184
Intermittent Problems
185
Power Supply Block Diagram
187
6 Digital Control Troubleshooting
188
Information on this Chapter
189
Assembly Replacement Sequence
190
CPU Board (A7) Troubleshooting
191
A7 Switch Positions
191
Checking the CPU (A7) Red LED Patterns
192
Display Troubleshooting (A18,A19)
194
Evaluating Your Display
194
Red, Green, or Blue Pixels Specifications
194
Dark Pixels Specifications
195
Newtons Rings
195
Troubleshooting the GSP (A19) and the Display (A18)
196
Measure the Supply Voltages Applied to the GSP (A19)
196
Run Display Test 55
197
Inspect Ribbon Cable Repeat Display Test 55
197
Perform Walking One Pattern
197
Run Display Tests 59-61
199
Front Panel Troubleshooting (A1/A2)
200
Check Front Panel Leds after Preset
200
Identify the Stuck Key
201
Inspect Cables
203
Test Using a Controller
203
Run the Internal Diagnostic Tests
204
If the Fault Is Intermittent
206
Repeat Test Function
206
GPIB Failures
206
Digital Control Block Diagram
208
7 Source Troubleshooting Information on this Chapter
210
Source Troubleshooting Flowchart
211
Assembly Replacement Sequence
212
Start Troubleshooting here
213
Power Not Within Specifications
214
Phase Lock Error Message Displayed
214
Broadband Phase Lock Problems
216
Swap if Output Cables to Check R Sampler Assembly (A64)
217
Check Open Loop Power
219
Check Reference Board (A12)
221
Check Fractional-N Digital (A14) with ABUS
222
Check the Fractional-N Analog (A13) and Fractional-N Digital (A14) with a Spectrum Analyzer
223
Check the VCO (A14) Range with Oscilloscope
224
Substituting Tuning Voltages to Check the VCO
224
Divide-By-N (A14) Circuit Check
225
A14-To-A13 Digital Control Signals Check
225
Pulse Generator (A52) Check with Oscilloscope
227
Pulse Generator (A52) Check with Spectrum Analyzer
228
Band-Related Problems
230
Broadband Power Problems
234
Alc/Signal Separation Check
234
Step Attenuator (A69) Check
235
8 Receiver Troubleshooting Information on this Chapter
238
Assembly Replacement Sequence
238
All Signal Paths Look Abnormal
239
2Nd lo Check
239
Mhz Check
239
At Least One Signal Path Looks Normal
240
Directional Coupler Check
243
A and B Sampler Check by Substitution
244
Sampler Voltage Check
245
2Nd Converter Check
245
9 Accessories Troubleshooting Information on this Chapter
248
Inspect and Gauge Connectors
249
Inspect the Error Terms
250
Isolate the Fault in the RF Path
251
Verify the RF Cable
252
Verify Shorts and Opens by Substitution
253
10 Service Key Menus and Error Messages
255
Information on this Chapter
256
Error Messages
257
Service Menus - Internal Diagnostics
257
Tests Menu
259
Test Options Menu
260
Self Diagnose Softkey
262
Test Descriptions
262
Service Menu - Service Features
269
Service Modes Menu
271
Service Modes more Menu
273
Analog Bus on off
274
Description of the Analog Bus (ANAB)
274
The Main ADC
274
The Frequency Counter
274
Analog in Menu
275
Analog Bus Nodes
276
PEEK/POKE Menu
283
Firmware Revision Softkey
284
GPIB Service Mnemonic Definitions
285
Invoking Tests Remotely
285
Analog Bus Codes
286
Service Related Error Messages in Alphabetical Order
287
11 Error Terms
295
Information on this Chapter
296
Error Terms Can also Serve a Diagnostic Purpose
297
Measurement Calibration Procedure
298
Error Term Inspection
299
If Error Terms Seem Worse than Typical Values
301
Uncorrected Performance
302
Error Term Descriptions
304
Directivity (EDF and EDR)
305
Source Match (ESF and ESR)
306
Reflection Tracking (ERF and ERR)
307
Isolation (Crosstalk, EXF and EXR)
308
Load Match (ELF and ELR)
309
Transmission Tracking (ETF and ETR)
310
12 Theory of Operation
311
Information on this Chapter
312
System Operation
313
Functional Groups of the Analyzer
315
Power Supply Theory
316
A15 Preregulator
316
A8 Post Regulator
317
Voltage Indications: the Green Leds
318
Digital Control Theory
319
A1 Front Panel
319
A2 Front Panel Processor
319
A7 CPU/A10 Digital if
319
A18 Display
320
A19 Graphics System Processor (GSP)
321
A20 Inverter
321
A16 Rear Panel
321
Source Group Theory
323
Source Pretune
324
A14/A13 Fractional-N Synthesizer
324
A52 Pulse Generator: the Harmonic Comb
324
A64 R Sampler: Down-Converting the Signals
324
A11 Phase Lock: Comparing Phase and Frequency
325
Tuning the YIG Oscillator
325
Phase Locked Sweep
325
A12 Reference: the Crystal Reference Frequencies
326
Source Block: the YIG Oscillator Signals
326
ALC: Automatic Leveling Control
328
Signal Separation: es Models Only
329
A58 M/A/D/S Modulator, Amplifier, Detector, Splitter
329
A58 M/A/D and A74 Switch Splitter (Option 400 Only)
330
A69 Step Attenuator
330
A74 Transfer Switch
331
A56 Lower Front Panel Assembly
331
A60 and A61 DC Bias Tees
331
A62 and A63 Directional Couplers
331
Signal Separation: ET Models Only
332
A58 M/A/D/S Modulator, Amplifier, Detector, Splitter
332
A69 Step Attenuator (All ET Option 004 Models)
333
A23 DC Block (8719ET Option 004 and 8720ET Option 004 Only)
333
A62 Directional Couplers
333
Receiver Theory
334
Samplers and Second Converters
334
A10 Digital if
335
13 Replaceable Parts
337
Information on this Chapter
338
Assembly Replacement Sequence
339
Rebuilt-Exchange Assemblies
340
Ordering Information
340
Replaceable Part Listings
342
Top Assemblies
342
Bottom Assemblies and Cables
342
Front RF Assemblies
400
Top Cables
402
Rear Cables, All Models
405
Front Cables, All Models
406
Front Panel Assembly, Inside
408
Rear Panel Assembly
410
Rear Panel Assembly, Option 1D5
412
Hardware, Top
414
Hardware, Bottom
416
Hardware, Front
418
Hardware, Preregulator
419
Chassis Parts, Outside
420
Chassis Parts, Inside
422
Miscellaneous Part Numbers
423
14 Assembly Replacement and Post-Repair Procedures
427
Information on this Chapter
428
Assembly Replacement Sequence
429
Procedures in this Chapter
430
Replacing the Line Fuse
431
Removing the Covers
432
Removing the Top Cover
432
Removing the Side Covers
432
Removing the Bottom Cover
432
Removing the Front Panel Assembly
434
Removing the Front Panel Interface and Keypad Assemblies
436
Removing the Display Lamp and Assembly
438
Removing the Rear Panel Assembly
440
Removing the Rear Panel Interface Board Assembly
442
Removing the Source Assemblies
444
Removing the A7 CPU Board Assembly
446
Removing the A7BT1 Battery
448
Removing the A15 Preregulator Assembly
450
Removing the A19 Graphics Processor Assembly
452
Removing the A3 Disk Drive Assembly
454
Removing the A62, A63 Test Port Couplers and LED Board Assemblies
456
Removing the A26 High Stability Frequency Reference (Option 1D5) Assembly
458
Removing the B1 Fan Assembly
460
Post-Repair Procedures
461
15 Safety and Regulatory Information General Information
466
Maintenance
466
Assistance
467
Shipment for Service
467
Safety Symbols
468
Instrument Markings
469
Lithium Battery Disposal
469
Safety Considerations
470
Safety Earth Ground
470
Before Applying Power
470
Servicing
471
General
472
Compliance with German FTZ Emissions Requirements
473
Compliance with German Noise Requirements
473
Other manuals for Agilent Technologies 8719ET
User Guide
478 pages
Programmer's Guide
541 pages
Configuration Guide
12 pages
4
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Agilent Technologies 8719ET Specifications
General
Brand
Agilent Technologies
Model
8719ET
Category
Measuring Instruments
Language
English
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