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6680A
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Agilent Technologies 6680A User Manual Page 49
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TROUBLESHOOTING
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50 Troubleshooting
Figure 3-11. Secondary
Interface Down (Sheet 1 of 2)
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SERVICE MANUAL
1
GPIB DC Power Supplies
1
Agilent Series 668xA
1
CERTIFICATION
2
WARRANTY
2
LIMITATION OF WARRANTY
2
EXCLUSIVE REMEDIES
2
ASSISTANCE
2
SAFETY CONSIDERATIONS
3
Safety Symbol Definitions
4
Printing History
4
Table of Contents
5
Related Documents
8
Manual Revisions
8
Safety Considerations
9
Conventions
9
Electrostatic Discharge
9
Verification
10
Electronic Load
11
Programming The Tests
12
General Considerations
12
Operation Verification Tests
13
Performance Tests
13
Constant Voltage (CV) Tests
13
Verification 15
14
Constant Current (CC) Tests
18
22 Verification
21
Verification 23
22
Averaging the CC Measurements
23
Troubleshooting
30
Test Equipment Required
31
Troubleshooting Procedures
31
Power-On Selftest
31
Troubleshooting Charts
33
Troubleshooting Test Points
33
Bias and Reference Supplies
33
Troubleshooting 35
34
36 Troubleshooting
35
Troubleshooting 37
36
38 Troubleshooting
37
Troubleshooting 39
38
40 Troubleshooting
39
Troubleshooting 41
40
42 Troubleshooting
41
Troubleshooting 43
42
44 Troubleshooting
43
Troubleshooting 45
44
46 Troubleshooting
45
Troubleshooting 47
46
48 Troubleshooting
47
Troubleshooting 49
48
50 Troubleshooting
49
Troubleshooting 51
50
52 Troubleshooting
51
A3 FET Board Troubleshooting
52
Troubleshooting 55
54
Signature Analysis
55
Introduction
55
Firmware Revisions
55
Test Headers
56
Troubleshooting 59
58
EEPROM Initialization
62
Disassembly Procedures
67
Tools Required
67
Top Cover
68
GPIB Board
68
A4 AC Input Assembly
69
A5 DC RAIL Assembly
69
A6 BIAS Assembly
69
A3 FET Board
69
A1DSP1 LCD Display
71
A1G1 and A1G2 Rotary Controls
71
A1KPD Keypad
71
Troubleshooting 73
72
74 Troubleshooting
73
Troubleshooting 75
74
76 Troubleshooting
75
Troubleshooting 77
76
78 Troubleshooting
77
Troubleshooting 79
78
80 Troubleshooting
79
Principles Of Operation
80
A1 Front Panel Assembly
81
A10 Control Board
81
A4 AC Input Board
84
A5 DC Rail Board
84
Output Circuits
85
Principles Of Operation 87
86
Replaceable Parts
87
How to Order Parts
88
Diagrams
113
General Schematic Notes
117
120 Diagrams
118
Diagrams 121
119
122 Diagrams
120
Backdating
146
Backdating 153
150
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