Dell 1815DN service manual Fault Signs Cause & Check, White Black spot, Never use usual alcohol

Troubleshooting

Fault	Signs	Cause & Check	Solution
White Black spot	• Light or dark black	1. If light or dark periodical black	1. In case of 1 above -
	dots on the image	dots occur, this is because the	Run OPC Cleaning Mode Print
	occur periodically.	developer rollers are contami -	4-5 times repeatedly to remove.
		nated with foreign substance	Especially check foreign sub -
	• White spots occur	or paper particles.	stance on the OPC surface, then
	in the image period-	(1) 37.7 mm interval : Charged	remove them with a clean gauze
	ically.	roller	moistened with IP	A(Isopropyl
		(2) 75.5 mm interval : OPC cycle	Alcohol) not to damage OPC if
			necessary.
		2. If white spots occur in a black	Never use usual alcohol.
			2. In case of 2
		image at intervals of 75mm, or
			If they are not disappeared by
		black spots occur elsewhere,
			running OPC Cleaning Mode
		the OPC drum is damaged or
			Print 4-5 times.
		foreign substance is stuck to
			: at intervals of 37.7 mm -
		the surface.
			Replace the developer.
			: at intervals of 75.5 mm -
			Remove foreign substance.
			: Broken image -
			Replace the developer accord -
			ing to carelessness.
		3. If a black and white or graphic	3. In case of 3 -
		image is partially broken at	Exchange the transfer roller
		irregular intervals, the transfer	because the life of	the transfer
		roller's life has been expired or	roller in use has been expired.
		the transfer voltage is abnor -	(Check the transfer voltage and
		mal.	readjust if different.)
Recycled product	• Poor appearance of	1. Poor appearance of the devel-	1. In case of 1 -
	the developer.	oper.	(1)If there is an evidence of disas-
		(1) Check the damage to label	sembling the developer.
	• Unclean and rough	and whether different mate-	(2)If materials other than normal
	printouts.	rials are used.	parts of the developer are
		(2) Check the appearance of	added or substituted.
	• Bad background in	parts of the developer, such
	the image.	as frame, hopper.
		2. Unclean and rough printouts.	2. In case of 2 -
		(1) Check whether foreign sub -	If there are any abnormals in
		stance or toner are stuck to	connection with the situation of 1.
		the terminal (contact point)	(1) It occurs when the developer
		of the developer.	is recycled over 2 times.
		(2) Check whether the state of	(2) If toner nearly being expired
		the terminal assembly is	are collected to use, it is
		normal.	judged as the recycled devel-
			oper.

7-26Service Manual