Toshiba e-STUDIO500P manual Print quality-blank, Print quality-random marks

	FRU	Action
4	HVPS cable	Check the continuity of the HVPS cable. If incorrect, replace the
	(part of front	cable assembly. If correct, replace the system board.
	harness cable)
	System board
Print quality—blank page

	FRU	Action
1	Print cartridge	Check the print cartridge for damage, especially the PC drum contact
		on the cartridge.
2	High voltage contact	Check the PC drum contact on the right side frame for damage, PC
		drum contact wear or contamination. If the contact is bent or
		damaged, replace the contact.
		Note: Inspect the HVPS PC drum contact on the board for damage
		or contamination.
3	HVPS	Check the fuse on the HVPS. If open, replace the HVPS. Check the
		voltages at J22 on the system board. Measure the following voltages
		from connector J22 to printer ground:
		•	Printer Idle
			J15-5 measures +24 V dc
		•	Printer Printing
			J15-5 measures +24 V dc
		If the voltages at J10-5 are incorrect, replace the system board.
4	Front cable harness HVPS	Check the front cable harness at J15 on the system board and at
	section	CN1 on the HVPS to make sure the harness is connected properly. If
		connected properly, check the continuity of the cable harness. If there
		is no continuity, replace the front cable harness.
5	Printhead assembly	Generally a 93x service error is posted if the printhead assembly fails
		and the printer does not give a blank copy symptom.
		The printhead used in the printer does not have a mechanical shutter
		as previous laser printers. The printer is interlocked through the front
		top cover interlock switch.

Print quality—random marks

Service tip: The primary cause of random marks is due to loose material moving around inside the printer and attaching to the photoconductor, charge roll, or transfer roll.

	Symptom	Action
1	Random marks	Check the print cartridge for loose or foreign material that might be
		on the photoconductor. Check the transfer roll and charge roll for any
		pieces of material that are stuck to the rolls.

Diagnostic information 2-117