Lexmark E310 Service Manual - Page 45

Operator Panel Service Check, Run POST and check each LED for proper operation.

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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 Models E310 & E312 Operator Panel Operator Panel Cable Models E310 & E312 Operator Panel Operator Panel Cable Controller Board Action 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. 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. Diagnostic Information 2-23

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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.