Lexmark Optra 4044-XXX, Service Manual

Page: 45 / 154

Diagnostic Information
2-23
4044-XXX
Operator Panel Service Check
Inspect the operator panel cable for damage. Make sure the cable is
plugged in securely.
Run POST and check each LED for proper operation.
FRU Action
Models E310 & E312
Operator Panel
Operator Panel Cable If more than one LED does not turn
on or an individual LED stays on
solid during POST, check the
operator panel cable for continuity.
Replace if defective. If the cable
measures continuity, replace the
operator panel.
Models E310 & E312
Operator Panel
Operator Panel Cable
Controller Board If all LEDs are dim and operate
erratically during POST or all LEDs
come on and stay on solid during
POST, replace the following FRUs
one at a time in the order shown:
Controller Board
Operator Panel
Operator Panel Cable
If none of the LEDs come on, make
sure the cable is properly connected
to the operator panel and the
controller board. Disconnect the
cable and check it for continuity.
Replace if necessary. If the cable
measures continuity, measure the
following voltages with the printer on
at idle:
U5-1: Ground
U5-2: +5 V dc
U5-3: +5 V dc
U5-5: +5 V dc
U5-6: Ground
If these voltages are not correct,
replace the controller board. If these
voltages are correct, replace the
operator panel.