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2002
Keithley 2002 Repair Manual
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Troubleshooting
2-8
Figure 2-2
Power supply block diagram
1
10/120V
AC
IN
Fuse: F101
Power
Switch: S101
Power T
ransformer
T100
1
10/120V Switching
Q101, Q102, Q103, Q106
U102, U105
K101, K102
±
15V Supply
CR1
13
C1
12, C1
13
U107, U109
Bootstrap Supply
CR1
14 - CR1
17
C1
16, C1
17
+5V Supply
CR1
12
C1
14, C1
15
U1
10
+15V
COM
-15V
+BS (34V to 38V)
Common 3
-BS (-34V to -38V)
+5V
Digital Common
Figure 2-3
Display boar
d block diagram
V
acuum Fluorescent Display
DS901
Dot Drivers
U901, U905
Grid Drivers
U903, U904
Controller
U902
Key Matrix
S901 - S931
Reset
Tx
Rx
20
22
Table of Contents
Default Chapter
7
Table of Contents
7
1 Routine Maintenance
11
Introduction
11
Line Fuse Replacement
11
Table 1-1 Power Line Fuse
11
Current Fuse Replacement
12
Front AMPS Input Fuse
12
Routine Maintenance
12
Table 1-2 Power Line Fuse
12
Rear AMPS Input Fuse
13
Fan Filter Cleaning
13
Firmware Updates
13
2 Troubleshooting
14
Introduction
14
Repair Considerations
15
Power-On Test
15
Front Panel Tests
15
KEYS Test
15
DISPLAY PATTERNS Test
15
Character Set Test
16
Diagnostics
16
Control Register Bit Patterns
16
Control Register Ics
16
Normal Operation Bit Patterns
16
Table 2-2 R1_STB Register Control Bits
17
Display Board Checks
18
Troubleshooting
18
Principles of Operation
19
Block Diagrams
19
Table 2-5 Display Board Checks
19
Figure 2-1 Model 2002 Overall Block Diagram
20
Figure 2-2 Power Supply Block Diagram
21
Figure 2-4 Digital Board Block Diagram
22
Figure 2-5 Analog Board Block Diagram
23
Display Board Circuit Theory
24
Power Supply Circuit Theory
24
Built-In Test Overview
25
Table
25
Using Built-In Test
28
AUTOMATIC Testing
28
MANUAL Testing
28
Built-In Test Documentation
30
Memory Element Tests
31
Digital I/O Tests
32
IEEE-488 Bus Tests
33
Triggers Tests
34
A/D Converter Tests
36
Integration Tests
40
A/D Multiplexer Tests
62
Temperature Sensor Test
64
A/D Converter Ground Multiplexer Tests
65
Input Buffer Tests
68
Open-Circuit Ohms Tests
69
Range Multiplexer Tests
71
Ohms Tests
74
100:1 Input Divider Test
76
Overload Tests
77
Calibration/Frequency Compensation DAC Tests
80
Regulator and Switching Tests
83
Absolute Value Circuit X1 Gain Tests
85
Absolute Value Circuit, X10 Gain Tests
88
Sample and Hold Tests
93
Front End X1, /100, /500 Tests
97
200 Frequency Compensation Tests
99
750 Frequency Compensation Tests
103
True RMS Converter and Filter Tests
107
Frequency Tests
109
Amps/Low Ohms Tests
115
Amps Protection Tests
120
ACA Switch Test
122
Ohms Sense Tests
123
3 Disassembly
126
Introduction
126
Handling and Cleaning Precautions
126
PC-Board Handling
126
Solder Repairs
126
Special Handling of Static-Sensitive Devices
127
Case Cover and Shield Removal
127
Case Cover Removal
127
Analog Board Top Shield Removal
127
PC-Board Removal
128
Digital Board
128
A/D Converter Board
128
Analog Board
128
Front Panel Disassembly
129
Cooling Fan Removal
130
Main CPU Firmware Replacement
130
Instrument Re-Assembly
131
Assembly Drawings
131
4 Replaceable Parts
132
Introduction
132
Parts Lists
132
Ordering Information
132
Factory Service
132
Component Layouts
132
Specifications
145
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4
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Keithley 2002 Specifications
General
Brand
Keithley
Model
2002
Category
Multimeter
Language
English
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