Toshiba e-STUDIO500P manual Print quality-black bands on outer edges, Print quality-residual image

Print quality—black bands on outer edges of the page

This print quality problem appears as vertical black bands on one or both sides of the copy and can be wide, narrow, light, or dark.

	FRU	Action
1	Charge roll counterbalance	If the problem is just on one side of the page, check the charge roll
	springs	counterbalance spring on that side. You can check to see if enough
		force is being applied to the charge roll by applying slight downward
		pressure with your finger to the charge roll link arm that the spring is
		attached to while you run a print test sample. See if the problem
		changes or goes away. If this fixes or changes the problem, then
		check the springs and charge roll link arm assemblies for binds or
		defective parts. Replace as necessary.
2	Charge roll assembly	Check the charge roll for toner buildup or other contamination on the
	Charge roll link arm	outer edges that correspond to the bands on the page. Check the
		charge links and arms for proper operation, binds or incorrectly
		mounted counterbalance springs. Repair or replace as necessary.
3	HVPS	Check the following voltages at J15-8 on the system board:
		• Printer Idle
		J15-8 measures 0 V dc
		• Printer Printing Test Page
		J15-8 voltage changes from 0 V dc to +4 V dc
		If the voltage does not vary, check the continuity of line J15-8 in the
		front cable harness. If there is no continuity, replace the cable
		harness. If there is continuity, replace the HVPS. If this does not
		correct the problem, replace the system board.
		Turn the printer off, and check the resistance between J15-7 and
		printer ground. The resistance measures approximately 0 ohms. If
		incorrect, make sure the system board is mounted correctly and
		securely grounded. If correct, replace the system board.

Print quality—residual image

Service tip: Install a new print cartridge if available before doing this service check. Residual image can be caused by the photoconductor, cleaning blade, and other parts inside the print cartridge.

	FRU	Action
1	Hot roll fuser assembly	Check the fuser assembly for toner contamination. The hot roll
		especially might cause toner to be retained and deposited on the
		page.

2-120Service Manual