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4294A
Service Manual
Agilent Technologies 4294A Service Manual Page 205
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196
9
Parts Repl
acement
Replaceable Part List
Figure 9-21
Rear Assembl
y 3
1
2
...
200
201
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207
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...
248
249
Manual Change
1
Change 2
2
OSC Level Accuracy Test
2
Service Manual
9
Manual Printing History
10
Safety Summary
11
Safety Symbol
12
Certification
12
Warranty
13
Limitation of Warranty
13
Exclusive Remedies
13
Assistance
13
Typeface Conventions
14
Contents
15
1 General Information
21
[System]
22
Require Equipment
24
*3.furnished with the 4294A
25
General Information
26
2 Performance Test
27
Performance Test
28
Frequency Accuracy Test
29
Specification
29
Test Equipment
29
[Center] - [1] - [M/μ]
34
[Center] - [1] - [M/m]
37
DC Bias Monitor Accuracy Test
39
DC Bias Level Accuracy Test
43
Measurement Accuracy Test
46
Capacitor) Setting
50
Resister) Setting
51
Standard Capacitor) Setting
57
Standard Resistor) Setting
57
[Cal] - FIXTURE COMPEN - OPEN
58
Calculation Sheet
60
Performance Test Record
76
3 Adjustment
89
Safety Considerations
90
Required Controller
90
Warm-up for Adjustment
90
Order of Adjustment
91
Equipment Setup
92
Required Equipment
100
Procedure
100
Adjustment
110
4 Troubleshooting
113
TROUBLESHOOTING SUMMARY
114
4. Troubleshooting
115
Troubleshooting
115
START HERE
116
INSPECT THE POWER ON SEQUENCE
117
Check the GPIB Interface
118
Check the Parallel Interface
118
Check the Power-On Selftest
119
Execute All Internal Tests
119
Execute the Individual Test
119
Null Detector Offset CC
123
5. Power Supply
125
INTRODUCTION
126
3.Check the A50 Five LEDs
129
4. Check the A1 +5 VD LED
129
5. Check the A9 Two LEDs
130
Power Supply Troubleshooting
132
3. Check the A50 SHUTDOWN LED
134
2. Remove A50
135
3. Remove Assemblies
135
STEADILY
136
CONVERTER
139
Table 5-1 A50 Power Supplies
140
6. Digital Control
141
A1 CPU Replacement
144
FIRMWARE INSTALLATION
145
2. Check the A1 CPU
149
6. Check the A53 FDD
151
8. Check the 24 BIT I/O PORT
151
9. Check the LAN Operation
152
7 Service Related Menus
155
DIAGNOSTIC TEST Menu
156
Test Descriptions
157
Service Related Menus
162
8 Theory of Operation
163
OVERALL OPERATION
164
POWER SUPPLY OPERATION
166
Line Power Module
167
A40 Preregulator
168
A50 DC-DC Converter
168
A50 Shutdown LED
168
A9 Floating Power Supply
168
DIGITAL CONTROL OPERATION
169
Theory of Operation
170
A30 Front Keyboard
171
A32 I-BASIC Interface
171
A34 I/O Connector
171
A54 Inverter
172
SOURCE THEORY
173
A2 Hc Amp
174
TRANSDUCER THEORY
175
A3 Hp Amp
176
A4 Lc Amp
176
A5 IV Converter & Lp Amp
176
A6 Vector Generator
176
VECTOR RATIO DETECTOR THEORY
177
9 Parts Replacement
180
Replaceable Part List
181
Parts List
182
Parts Replacement
183
Table 9-4 Top View (Shield)
188
4TP Assembly
189
Table 9-8 Front Assembly 1
193
Table 9-9 Front Assembly 2
194
Table 9-10 Front Assembly 3
195
Table 9-12 Front Assembly 5
197
Table 9-13 Front Assembly 6
198
Table 9-14 Front Assembly 7
199
Table 9-15 Front Assembly 8
200
Table 9-16 Front Assembly 9
201
Table 9-17 Front Assembly 10
202
Table 9-18 Rear Assembly 1
203
Table 9-19 Rear Assembly 2
204
Figure 9-21 Rear Assembly 3
205
Table 9-20 Rear Assembly 3
206
Table 9-21 Rear Assembly 4
207
Table 9-22 Rear Assembly 5
208
Table 9-23 Side View
209
Table 9-24 Chassis Assembly
210
Table 9-25 Other Parts
211
Replacement Procedure
212
Front Panel Removal
213
Rear Panel Removal
213
A1 CPU Board Replacement
214
A2/A8/A50/A51 Replacement
214
A3 Hp Amplifier Replacement
214
A4 Lc Amplifier Replacement
215
A7 Synthesizer Replacement
216
A53 FDD Removal
217
A52 LCD Removal
218
A40 Preregulator Replacement
218
Power Switch Replacement
219
10 Post Repair Procedures
222
POST REPAIR PROCEDURES
223
216 10
225
Post Repair Procedures
225
A Manual Changes
226
Manual Changes
227
B Power Requirement
228
Replacing Fuse
229
Power Requirements
230
222 Appendix B
231
Power Requirement
231
C Error messages
232
Order of Alphabet
233
240 Appendix C
249
Error messages
249
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