Xerox WorkCentre Pro 412 Service Manual page 220

Maintenance & Troubleshooting
Fault Signs
White Black spot • Light or dark black
dots on the image
occur periodically.
Digital Prin
• White spots occur
Digital Prin
in the image peri-
odically.
Digital Prin
Digital Prin
Digital Prin
Recycled product • Poor appearance of
the developer.
• Unclean and rough
printouts.
• Bad background in
the image.
7-50
Cause & Check
1. If light or dark periodical black
dots occur, this is because the
developer rollers are contami-
nated with foreign substance or
paper particles.
(1)37.7mm interval :
Charged roller
(2)94.3mm interval :
OPC cycle
2. If white spots occur in a black
image at intervals of 94, 29mm,
or black spots occur elsewhere,
the OPC drum is damaged or
foreign substance is stuck to the
surface.
3. If a black and white or graphic
image is partially broken at irreg-
ular intervals, the transfer roller's
life has expired or the transfer
voltage is abnormal.
1. Poor appearance of the devel-
oper.
(1)Check the damage to label
and whether different materials
are used.
(2)Check the appearance of parts
of the developer, such as the
frame or the hopper.
2. Unclean and rough printouts.
(1)Check whether foreign sub-
stance or toner are stuck to the
terminal (contact point) of the
developer.
(2)Check whether the state of the
terminal assembly is normal.
3/03
Solution
1. In case of 1 above -
Run OPC Cleaning Mode Print 5-5
times repeatedly to remove. Especially
check foreign substance on the OPC
surface, then remove them with a clean
gauze moistened with IPA(Isopropyl
Alcohol) not to damage OPC if neces-
sary.
Caution : Never use usual alcohol.
2. In case of 2
If they have not disappeared by running
OPC Cleaning Mode Print 5-5 times.
: at intervals of 94.3mm -
Replace the developer.
: at intervals of 37.7mm -
Remove foreign substance, Clean the
Charged Roller
: Broken image -
Replace the developer according to
carelessness.
3. In case of 3 - Exchange the transfer
roller because the life of the transfer
roller in use has been expired. (Check
the transfer voltage and readjust if differ-
ent.)
1. In case of 1 -
(1)If there is an evidence of disassem-
bling the developer.
(2)If materials other than normal parts of
the developer are added or substituted.
2. In case of 2 - If there are any abnor-
mals in connection with the situation of
1.
(1)It occurs when the developer is recy-
cled more than twice.
WorkCentre Pro 412, FaxCentre F12 &
WorkCentre M15/M15i