Dell 2330dn service manual Black, Heavy background

Black page

Note: Incorrect laser exposure or incorrect charging of the photoconductor causes an all black page. Always verify the same results from a different print cartridge assembly and developer before proceeding.

FRU	Action
Toner electrodes (not	Check the three rearward electrodes below the toner cartridge assembly for contamination,
a FRU)	damage, or a short to ground. Correct as necessary.
	Check continuity between the cable (DEV, TAR, and doctor blade) connection PCN3 and
	on the contact tips below the toner cartridge assembly.
	• If continuity fails, then call the next level of service.
	With the printer off, disconnect the LVPS/HVPS cable from J502 on the controller board.
	Turn the printer on, and verify +24 V dc on pins 17 and 19 of the cable.
	Verify +5 V dc on pins 1, 3, 5, 13, and 15.

Verify ground on pins 10, 12,14, 16, and 18.

LVPS/HVPS board	•	If any of the values are incorrect, then replace LVPS/HVPS board.
Controller board	•	If the grounds are incorrect, then check ground paths.
Miscellaneous cables
	•	Check continuity in the cable. If the cable is bad, then call the next level of support.
	•	If the values are correct and the toner electrodes are good, then replace the controller
		board.
	•	See the “LVPS/HVPS service check” on page 2-25 and the “Controller board
		service check” on page 2-22, if necessary.

Heavy background

Poor development or poorly charged toner particles cause excessive background. This is more noticeable as the toner cartridge nears end-of-life.

FRU	Action
Toner cartridge (not a	Check the toner darkness setting in the driver. Try a lower setting.
FRU)	Make sure the toner cartridge and PC Kit are correctly installed and the high voltage
PC Kit (not a FRU)
	contacts are clean.
	If the toner cartridge and PC Kit are installed correctly, then try a new PC Kit first and then
	toner cartridge.
	Check the contacts for correct installation and contamination where contact is made
	between the print cartridge assembly and spring contacts which connect to the LVPS/HVPS
	board at CN203. Clean as necessary.
	If this does not correct the problem, then replace the following FRUs one at a time in the
	order shown:
LVPS/HVPS	•	LVPS/HVPS board (See “Black page” on page 2-31for pin values.)
Controller board	•	Controller board

Diagnostics information 2-31