Table of Contents
1 GENERAL INFORMATION ....................................................................................... 4
1.1 WARRANTY INFORMATION ................................................................................ 4
1.2 LIMITATION OF WARRANTY .............................................................................. 5
1.3 PRECAUTION OF OPERATION ............................................................................ 5
1.4 MAINTENANCE OF M3500A ............................................................................. 6
1.5 SAFETY INFORMATION ...................................................................................... 6
1.6 SYMBOLS AND TERMS ....................................................................................... 7
2 GENERAL MAINTENANCE ....................................................................................... 8
2.1 SETTING LINE VOLTAGE AND REPLACING FUSE .............................................. 8
2.1.1 Voltage Selector ................................................................................. 8
2.1.2 Transformer ....................................................................................... 11
2.1.3 Power Line Fuse ................................................................................ 13
2.2 CURRENT INPUT FUSE – 3.15 A ................................................................... 15
2.2.1 Current Input Fuse – 7 A ................................................................... 18
2.3 PASS/FAIL OUTPUT FROM USB CONNECTOR ............................................... 21
2.4 MCUS & DSP FIRMWARE UPGRADE ............................................................. 22
3 TROUBLESHOOTING ............................................................................................... 26
3.1 INTRODUCTION ............................................................................................... 26
3.2 SYSTEM FUNCTION BLOCKS ........................................................................... 28
3.3 PANEL MODULE ............................................................................................... 29
3.4 MAIN BOARD MODULE.................................................................................... 30
3.4.1 Power Supply Circuitry ................................................................... 31
3.4.2 Analog Front-end Circuitry ............................................................ 32
3.4.3 ADC & MCU......................................................................................... 33
3.4.4 Main Control Circuitry ..................................................................... 34
3.5 SELF-TEST ....................................................................................................... 35
4 DISASSEMBLY & RE-ASSEMBLY ....................................................................... 39
4.1 INTRODUCTION ............................................................................................... 39
4.2 CASE COVER REMOVAL .................................................................................. 39
4.3 MAIN BOARD REMOVAL .................................................................................. 42
4.4 FRONT PANEL DISASSEMBLY .......................................................................... 48
4.5 ASSEMBLY DRAWINGS .................................................................................... 51
4.5.1 Front Panel Assembly ..................................................................... 52
4.5.2 Chassis and Transformer Assembly ........................................... 53
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