- HP Printer User Manual

3-44 Troubleshooting Analysis Guide (TAGs)
TAG 030: Developer Bias Short/Failure
Error Code: 030
Possible Defects: Cleaner unit
High voltage unit
DC power supply
Connectors or wiring
PCL board
Printhead assembly
Power control #2 board
Developer unit
1 Turn the printer off and unplug the power cord.
• Verify that J/P23, J/P24, J/P40, J/P41, J/P96, and J/P85 are connected properly.
• Power-on-reset the printer.
Is error code 030 still displayed?
No: A loose connector was at fault. Turn to TAG 002: Check & Problem Resolution.
Yes: Continue.
2 Check the voltages, as described in Chapter 9, “General Printer Maintenance”.
Are the voltages correct?
No: Replace the high voltage power supply unit, then turn to TAG 002: Check & Problem
Resolution.
Yes: Continue.
3 Has the developer unit been replaced recently?
No: Go to #5 in this TAG.
Yes: Continue.
4 Replace the cleaner unit.
• Run test prints.
Is error code 030 still displayed?
No: The cleaner unit was defective; turn to TAG 002: Check & Problem Resolution.
Yes: Reinstall the original cleaner unit and go to #6 in this TAG.
5 Replace the developer unit.
• Install a new toner cartridge.
• Run test prints.
Is error code 030 still displayed?
No: The developer unit was defective; turn to TAG 002: Check & Problem Resolution.
Yes: Reinstall the original developer unit and continue.