Stains On Back Of Paper; Dark Vertical Lines (Paper Feed Direction) - Canon LBP-CX Series Service Manual

1-6 Stains on back of paper
Cause Step Check Result
Measure
Manual paper feed I Is the manual paper feed guide YES Clean it with a damp cloth, then with
guide dirty or correctly grounded? a dry cloth if it is dirty. Ground it if
it is not correctly grounded.
Leading-edge blank 2 Is the leading-edge blank area NO Replace the DC controller PCB.
area
about 2 mm?
Transfer guides 3 Is there toner on the transfer YES Clean with a damp cloth, then with
guides, or are the guides dirty?
a dry cloth.
4 Are the transfer guides correctly NO Ground them correctly.
grounded via l SMQ resistance?
Transfer corona ass'y,
5
Is there any toner on the assembly YES Clean with a damp cloth, then with
feeder guides or guides? a dry cloth.
Separation belt, roller 6 Is there any toner on the belt or YES Clean with a damp cloth, then with a
and pinch roller rollers? dry cloth.
Fixing assembly 7 Is the assembly correctly ground- NO Ground it correctly.
ed?
EP cartridge 8 Is there any toner on the under- YES Clean with a damp cloth, then with
side of the EP cartridge? a dry cloth.
·Fixing roller cleaner 9
Is the fixing roller cleaner felt YES Replace the fixing roller cleaner felt.
felt dirty?
1-7 Dark vertical lines (paper feed direction)
L
Cause Step Check
Result Measure
Fixing roller cleaner 1
Is the fixing roller cleaner felt
YES Replace the fixing roller cleaner felt.
felt
dirty?
EP cartridge
2
Turn the printer off in the middle
YES Replace the EP cartridge.
of printing and open the upper
half of the printer. Open the pro-
tective shield on the EP cartridge.
Can you see a vertical line on the
drum?
(Make this check as quickly as
possible to prevent light from
damaging the drum.)
COPYRIGHT
©
BY CANON INC. CAllON LBP-CX SERIES REY.2 JULY 1985 PRlllTED Ill JAPAN (IMPRIME Ali JAPDlll
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