7-1
Chapter 7
Corrective Maintenance
Title
Page
7.1 Introduction
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7-3
7.2 Starting Fault Finding
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7-4
7.3 Charger Circuit
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7-4
7.4 Starting with a Dead Test Tool
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7-6
7.4.1 Test Tool Completely Dead
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7-6
7.4.2 Test Tool Software Does not Run
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7-7
7.4.3 Software Runs, Test Tool not Operative
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7-7
7.5 Miscellaneous Functions
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7-8
7.5.1 Display and Back Light
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7-8
7.5.2 Fly Back Converter
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7-9
7.5.3 Slow ADC
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7-10
7.5.4 Keyboard
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7-11
7.5.5 Optical Port (Serial RS232 Interface)
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7-11
7.5.6 Channel A, Channel B Voltage easurements
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7-11
7.5.7 Channel A Ohms and Capacitance Measurements
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7-13
7.5.8 Trigger Functions
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7-14
7.5.9 Reference Voltages
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7-15
7.5.10 Buzzer Circuit
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7-15
7.5.11 Reset ROM Circuit
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7-16
7.5.12 RAM Test
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7-16
7.5.13 Power ON/OFF
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7-16
7.5.14 PWM Circuit
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7-17
7.5.15 Randomize Circuit
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7.6 Loading Software
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7-17
7.7 Configuration of CPLD-chip D470
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7-17