TAG 500: +5 Vdc Power Malfunction

Error Code:

500

Symptoms: Operator panel blank with AC power supply cooling fan running

Possible Defects: DC fuse

DC power supply unit

Connectors or wiring

Operator panel circuit board

PCL board

IGS board

Disk drive assembly

LED printhead assembly

Attachment option

AC power supply

Signal interface board

Duplex control board #1

Duplex control board #2

1 Turn off the printer and unplug the power cord.

•Confirm that J/P94, J/P4, J/P41, J/P91, J/P90, J/P6, and J/P8 are connected properly.

•Power-on-reset the printer.

Is the operator panel still blank?

No: Loose connectors were at fault. Turn to TAG 002: Check & Problem Resolution.

Yes: Continue.

2 Check J/P8-10 for +5 Vdc.

Is the voltage +5 Vdc?

No: Go to #7 in this TAG.

Yes: Continue.

3 Check J/P91-5 for +5 Vdc.

Is the voltage +5 Vdc?

No: Repair or replace the connectors or wiring from P8-10 to P91-5, then turn to TAG 002: Check & Problem Resolution.

Yes: Continue.

4 Check J/P94-1 for +5 Vdc.

Is the voltage +5 Vdc?

No: Repair or replace the connectors or wiring from P8-14 to J94-1, then turn to TAG 002: Check & Problem Resolution.

Yes: Continue.

Troubleshooting Analysis Guide (TAGs)

3-113