Service manual

MDS E-SCAN MONITOR PROBLEM ANALYSIS

6. Monitor Problem Analysis

6.1 Procedures

The following analysis procedures are meant to aid in isolating Monitor failures down to the

board. Board or device replacement with a fast turnaround is available from EMC.

These abbreviations are used:

I/O Main Monitor I/O Board Conditions analog voltages for digital microprocessor.

CPU CPU Card Microprocessor, plugs into the I/O board.

IB Interface Board Most external connections are made to this board.

6.2 Trouble Shooting Chart

SYMPTOM

POSSIBLE CAUSE

No display, failsafe LED off.

No display, backlighting.

Fuse blown.

Power supply failure, check ±15vdc and

5vdc.

No display and failsafe LED on.

Display failure.

Video cable failure.

Display on but is garbled.

CPU card failing.

Buttons do not respond properly.

Connector from overlay to I/O board not, or

improperly mated with J5.

Front panel overlay defective.

Defective I/O board (keyboard section).

Monitor does not save configuration changes

CPU card failure.

Before any troubleshooting always check that all cards are properly plugged in, ribbon

cables are properly socketed and that correct power is supplied.