SECTION 5: TROUBLESHOOTING GUIDE 81
EPI800 Manual.doc EPI 800 MANUAL 2001 Vision Microsystems Inc.
INDICATOR TROUBLESHOOTING
DISPLAY BACKLIGHTING INOPERATIVE:
The backlighting power for the indicators originates in the DPU. A
small inverter generates 0 to 80 volts AC depending on the
amount of DC voltage applied to DPU J4 pin 16. Follow these
steps to isolate the cause of the backlighting problem:
NOTE: All succeeding steps presume prior steps have passed.
If illumination is out on all indicators:
1. Verify dimmer power is correctly applied to DPU backlight input pin
(full brightness would be close to full battery voltage, measured
with a voltmeter, from your dimmer system).
2. Listen to the DPU. A faint whine can be heard inside the DPU if the
inverter is running. This test must be conducted in complete quiet
and you must be within approximately 12 inches from DPU to hear
it.
3. Shut off dimmer power and unplug the display cable from the DPU.
Re-apply dimmer power and listen again for the whining tone. If it is
not present, then the problem is in the DPU.
4. Shut off dimmer power and unplug all indicators from the display
cable. Reconnect display cable to the DPU.
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