Fluke 123B/S Service Manual - Page 5

Disassembling the Test Tool, Corrective Maintenance, Circuit Diagrams, Modifications

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Contents (continued) Disassembling the Test Tool 6-1 6.1. Introduction 6-3 6.2. Disassembling Procedures 6-3 6.1.1 Required Tools 6-3 6.2.2 Removing the Battery Pack 6-3 6.2.3 Removing the Bail 6-3 6.2.4 Opening the Test Tool 6-3 6.2.5 Removing the Main PCA Unit 6-5 6.2.6 Removing the Display Assembly 6-6 6.2.7 Removing the Keypad and Keypad Foil 6-6 6.3 Disassembling the Main PCA Unit 6-6 6.4 Reassembling the Main PCA Unit 6-8 6.5 Reassembling the Test Tool 6-8 Corrective Maintenance 7-1 7.1 Introduction 7-3 7.2 Starting Fault Finding 7-4 7.3 Charger Circuit 7-4 7.4 Starting with a Dead Test Tool 7-6 7.4.1 Test Tool Completely Dead 7-6 7.4.2 Test Tool Software Does not Run 7-7 7.4.3 Software Runs, Test Tool not Operative 7-7 7.5 Miscellaneous Functions 7-8 7.5.1 Display and Back Light 7-8 7.5.2 Fly Back Converter 7-9 7.5.3 Slow ADC 7-10 7.5.4 Keyboard 7-11 7.5.5 Optical Port (Serial RS232 Interface 7-11 7.5.6 Channel A, Channel B Voltage easurements 7-11 7.5.7 Channel A Ohms and Capacitance Measurements 7-13 7.5.8 Trigger Functions 7-14 7.5.9 Reference Voltages 7-15 7.5.10 Buzzer Circuit 7-15 7.5.11 Reset ROM Circuit 7-16 7.5.12 RAM Test 7-16 7.5.13 Power ON/OFF 7-17 7.5.14 PWM Circuit 7-17 7.5.15 Randomize Circuit 7-17 7.6 Loading Software 7-17 7.7 Configuration of CPLD-chip D470 7-17 Circuit Diagrams 9-1 9.1 Introduction 9-1 9.2 Schematic Diagrams 9-2 Modifications 10-1 10.1 Software modifications 10-1 10.2 Hardware modifications 10-1

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Contents
(continued)
Disassembling the Test Tool
.........................................................................
6-1
6.1. Introduction
................................................................................................
6-3
6.2. Disassembling Procedures
.........................................................................
6-3
6.1.1 Required Tools
....................................................................................
6-3
6.2.2 Removing the Battery Pack
.................................................................
6-3
6.2.3 Removing the Bail
...............................................................................
6-3
6.2.4 Opening the Test Tool
.........................................................................
6-3
6.2.5 Removing the Main PCA Unit
.............................................................
6-5
6.2.6 Removing the Display Assembly
.........................................................
6-6
6.2.7 Removing the Keypad and Keypad Foil
..............................................
6-6
6.3 Disassembling the Main PCA Unit
.............................................................
6-6
6.4 Reassembling the Main PCA Unit
..............................................................
6-8
6.5 Reassembling the Test Tool
........................................................................
6-8
Corrective Maintenance
.................................................................................
7-1
7.1 Introduction
.................................................................................................
7-3
7.2 Starting Fault Finding
. ................................................................................
7-4
7.3 Charger Circuit
............................................................................................
7-4
7.4 Starting with a Dead Test Tool
...................................................................
7-6
7.4.1 Test Tool Completely Dead
.................................................................
7-6
7.4.2 Test Tool Software Does not Run
. ......................................................
7-7
7.4.3 Software Runs, Test Tool not Operative
.............................................
7-7
7.5 Miscellaneous Functions
.............................................................................
7-8
7.5.1 Display and Back Light
.......................................................................
7-8
7.5.2 Fly Back Converter
..............................................................................
7-9
7.5.3 Slow ADC
............................................................................................
7-10
7.5.4 Keyboard
..............................................................................................
7-11
7.5.5 Optical Port (Serial RS232 Interface)
..................................................
7-11
7.5.6 Channel A, Channel B Voltage easurements
.......................................
7-11
7.5.7 Channel A Ohms and Capacitance Measurements
..............................
7-13
7.5.8 Trigger Functions
.................................................................................
7-14
7.5.9 Reference Voltages
..............................................................................
7-15
7.5.10 Buzzer Circuit
....................................................................................
7-15
7.5.11 Reset ROM Circuit
............................................................................
7-16
7.5.12 RAM Test
..........................................................................................
7-16
7.5.13 Power ON/OFF
..................................................................................
7-17
7.5.14 PWM Circuit
......................................................................................
7-17
7.5.15 Randomize Circuit
.............................................................................
7-17
7.6 Loading Software
........................................................................................
7-17
7.7 Configuration of CPLD-chip D470
.............................................................
7-17
Circuit Diagrams
............................................................................................
9-1
9.1 Introduction
.................................................................................................
9-1
9.2 Schematic Diagrams
....................................................................................
9-2
Modifications
..................................................................................................
10-1
10.1 Software modifications
.............................................................................
10-1
10.2 Hardware modifications
............................................................................
10-1