Horizontal Black Band, Black/White Spot

Troubleshooting

7.3.3 Horizontal Black Band

1.Dark or blurry horizontal stripes occur in the printing periodically . (They may not occur periodically.)

Check and Cause			Solution

1. Bad contacts of the voltage terminals to			1. Clean each voltage terminal of the Charge,
developer.			Supply, Develop and Transfer roller.
			(remove the toner particles and paper par -
			ticles)
2. The rollers of developer may be stained.			2. Clean the right Gear that has a relatively
Charge roller	=	37.7 mm	small gap of the teeth in the OPC.
Supply roller	=	37 mm
Develop roller =		35.3 mm
Transfer roller =		45.3 mm
			3. If the malfunction persists, replace the
			developer.

Digital Printer

1.Dark or blurry black spots occur periodically in the printing.

2.White spots occur periodically in the printing.

Check and Cause	Solution

1. If dark or blurry black spots occur	1. Run OPC cleaning Mode Print and run the
periodically, the rollers in the Developer	Self-test 2 or 3 times.
may be contaminated with foreign matter
or paper particles.
( Charge roller : 37.7 mm interval
OPC drum : 75.5 mm interval)
2. If faded areas or voids occur in a black	2. In case of 75.5 mm interval unremovable in
image at intervals of 75.5 mm, or black	1, cleanly remove foreign substances stuck
spots occur elsewhere, the OPC drum	on the OPC location equivalent to black
surface is damaged.	spots and white spots with a dry duster .
3. If a black image is partially broken, the	3. The transfer roller guarantees 60,000
transfer voltage is abnormal or the trans -	sheets printing. If the roller's life is expired,
fer roller's life has expired.	replace it.
	4. In case of 37.7 mm interval unremovable in
	1, take measures as to replace the develop-
	er cartridge and try to print out.
	5. Clean the inside of the set against the paper
	particles and foreign matter in order not to
	cause the trouble.

Service Manual 7-11