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Troubleshooting Analysis Guide (TAGs) 3-113
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.