Service Manual
Troubleshooting
7-26
Fault Signs Cause & Check Solution
White Black spot
Recycled product
• Light or dark black
dots on the image
occur periodically.
• White spots occur
in the image period-
ically.
• Poor appearance of
the developer.
• Unclean and rough
printouts.
• Bad background in
the image.
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) 37.7 mm interval : Charged
roller
(2) 75.5 mm interval : OPC cycle
2. If white spots occur in a black
image at intervals of 75mm, 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
irregular intervals, the transfer
roller's life has been expired or
the transfer voltage is abnor -
mal.
1. Poor appearance of the devel-
oper.
(1) Check the damage to label
and whether different mate-
rials are used.
(2) Check the appearance of
parts of the developer, such
as frame, 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.
1. In case of 1 above -
Run OPC Cleaning Mode Print
4-5 times repeatedly to remove.
Especially check foreign sub -
stance on the OPC surface, then
remove them with a clean gauze
moistened with IP A(Isopropyl
Alcohol) not to damage OPC if
necessary.
Never use usual alcohol.
2. In case of 2
If they are not disappeared by
running OPC Cleaning Mode
Print 4-5 times.
:
at intervals of 37.7 mm -
Replace the developer.
: at intervals of 75.5 mm -
Remove foreign substance.
: Broken image -
Replace the developer accord -
ing 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 different.)
1. In case of 1 -
(1)If there is an evidence of disas-
sembling 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 abnormals in
connection with the situation of 1.
(1) It occurs when the developer
is recycled over 2 times.
(2) If toner nearly being expired
are collected to use, it is
judged as the recycled devel-
oper.
