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Keithley
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2002
Keithley 2002 Repair Manual
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Troubleshooting
2-10
Figure 2-5
Analog boar
d block diagram
V
olts/Ohms
Inputs
Input
Switching
Q242 - Q246
Input
Buffer
Q241, Q250
U245
A/D Mux
U222
A/D Buffer
U226
A/D
Converter
2002-166
A/D Counts
to MPU
Ohms
Current
Source
U231, U233
Ohms
Ref.
U230
7V
Ref.
U218
U219
U255
2V
Ref.
U241
AMPS IN
Amps Ranging
I-V Converter
R295, R319
R362
Q215 - Q217
Q222, Q223
AC Input
Buffer
Q410, Q415
Q420, Q424
V
ariable-Gain
Amplifier
U419, U424
Peak
Detector
U405
Output
Filter
U426
Output
Buffer
U403
Control Data
from MPU
R1_STB
Control Register
U203, U221, U224
R2_STB
Control Register
U400, U41
1, U406, U432
Zero-Crossing
Amp
U416
MUX_STB
Control Register
U206, U207
22
24
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
Speciļ¬cations
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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