Fluke 8840A - Page 12

Table of Contents
SECTlON TITLE PAGE
6.35 .
EXTERNAL TRIGGER POLARITY SELECTION (Option -05 Only) ..................... 6-25
6.36
. TROUBLESHOOTING .............................................................. 6-25
6.37
. Initial Troubleshooting Procedure .................................................. 6-25
6.38
. Diagnostic Self-Tests ............................................................. 6-29
6.39
. Self-Test Descriptions ............................................................ 6-29
6-40
. Digital Controller Troubleshooting ................................................. 6-31
6-41
. IN-GUARD MICROCOMPUTER SYSTEM ...................................... 6-31
6-42
. In-Guard Microcomputer .................................................... 6-32
6.43
. Address Latch (U219) ...................................................... 6-33
6.44
. External Program Memory (XU222) .......................................... 6-33
6-45
. Calibration Memory (U220) ................................................. 6-33
6.46
. Relay Buffer (U201) ........................................................ 6-33
6-47
. 3-to-8 Chip Select Decoder (U208) ........................................... 6-34
6.48
. DISPLAY SYSTEM ........................................................... 6-34
6-49
. Display Control (U212) ..................................................... 6-34
6.50
. 8-Bit Digit Driver (U215) ................................................... 6-34
6.51
. 3-to-8 Strobe Decoder (U213) ............................................... 6-34
6.52
. 8-Bit Segment Driver (U217) ................................................ 6-34
6.53
. 4-to-7 Segment Decoder (U216) .............................................. 6-34
6.54
. 8-Bit Digit Driver (U218) ................................................... 6-34
6.55
. Hex Inverter (U203) ........................................................ 6-34
6.56 . Hex Inverter (U221) ........................................................ 6-34
6.57
. Quad OR Gate ('21 1) ..................................................... 6-35
6.58
. Keyboard Wiring ............................................................ 6-35
6.59
. ANALOG CONTROL SIGNALS ............................................... 6-35
6.60
. Evaluating Static Signals .................................................... 6-36
6.61
. Evaluating Dynamic Signals ................................................. 6-36
6.62
. DC Scaling Troubleshooting ...................................................... 6-38
6.63
. TracIdHold Troubleshooting ....................................................... 6-38
6.64
. Ohms Current Source Troubleshooting .............................................. 6-39
6.65
. Precision Voltage Reference Troubleshooting ........................................ 6-39
6.66
. AP Converter Troubleshooting .................................................... 641
6.67
. Power Supply Troubleshooting .................................................... 642
6.68
. IEEE-488 Interface Troubleshooting (Option -05) .................................... 6-44
6.69
. SERVICE POSITION ......................................................... 6-44
6.70
. DIAGNOSTIC PROGRAM ..................................................... 6-45
6.71
. True RMS AC Troubleshooting (Option .09) ........................................ 646
6.72
. SERVICE POSITION ......................................................... 646
6.73
. MAJOR PROBLEMS .......................................................... 6-46
6.74
. MORE OBSCURE PROBLEMS ................................................ 648
6.75
. Guard Crossing Troubleshooting ................................................... 6-48
6.76
. INTERNAL CLEANING ............................................................ 6-48
6.77
. Cleanhg Printed Circuit Assemblies ................................................ 6-48
6.78
. Cleaning After Soldering ......................................................... 649
7 List of Replaceable Parts ................................................................ 7-1
7.1 . INTRODUCTION 7-2
..................................................................
.
7.2 HOW TO OBTAIN PARTS ......................................................... 7-2
. 7.3 MANUAL STATUS INFORMATION ................................................. 7-2
7-4 . NEWER INSTRUMENTS ........................................................... 7-2
7.5
. SERVICE CENTERS 7-2
...............................................................
8
Options and Accessories ................................................................ 8-1
.
8.1 INTRODUCTION 8-1
..................................................................
.
8.2 ACCESSORIES 8-1
....................................................................
8.3 . Rack-Mount Kits (Y8834, Y8835 and Y8836) ....................................... 8-1
8.4 .
Shielded IEEE-488 Interface Cables (Y8021. Y8022. and Y8023) ...................... 8-1
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