87 V/AN
Service Manual
ii
Backlight....................................................................................................... 18
Beeper ........................................................................................................... 18
Troubleshooting ................................................................................................ 19
Restoration Actions....................................................................................... 19
Basic Maintenance ............................................................................................ 19
Cleaning the Meter........................................................................................ 19
Opening the Meter Case ............................................................................... 20
Accessing the PCA and Replacing the LCD................................................. 21
Reassembling the Meter Case....................................................................... 22
Replacing the Battery.................................................................................... 22
Testing Fuses and Current Circuitry ............................................................. 22
Replacing the Fuses ...................................................................................... 23
Required Equipment.......................................................................................... 24
Performance Tests............................................................................................. 24
Basic Operability Tests................................................................................. 25
Testing the Fuses .......................................................................................... 25
Testing the Display ....................................................................................... 25
Testing the Pushbuttons ................................................................................ 27
Testing Meter Accuracy................................................................................ 27
Calibration Adjustment ..................................................................................... 29
Calibration Adjustment Counter ................................................................... 29
Calibration Adjustment Password................................................................. 29
Changing the Password ............................................................................ 29
Restoring the Default Password ............................................................... 30
Meter Buttons Used in the Calibration Steps................................................ 31
Calibration Adjustment Procedure................................................................ 31
Service and Parts ............................................................................................... 33
Schematic Diagrams.......................................................................................... 38
