2KN/2KP
1-4-53
(3) Image is too light.
(4) Background is visible.
(5) A white line appears longitudinally.
Copy example Causes Check procedures/corrective measures
Insufficient toner. If the display shows the message requesting toner replen-
ishment, replace the toner container.
Deteriorated toner. Perform the drum refresh operation (see page 1-3-105).
The transfer
voltage is
not output
properly.
The connector terminals
of the transfer high volt-
age PWB make poor
contact.
Reinsert the connector. Also check for continuity within the
connector cable. If none, remedy or replace the cable.
Poor insertion transfer
unit.
Reinstall the transfer unit.
Continuity malfunction
inside the transfer belt.
Check for continuity. If none, remedy or replace.
Defective
developing
bias output.
Defective engine PWB. Check if YC7-5 both or one side of YC7-6 on the engine
PWB go low when run maintenance item U101. If not,
replace the engine PWB.
Check if 5 V DC is output from YC7-3 on the engine PWB
when run maintenance item U101. If not, replace the
engine PWB.
Surface
potential is
high.
Poor installation of high
voltage PWB.
Check the installation state of the high voltage PWB.
Defective high voltage
PWB.
If the grit output is zero when the high voltage PWB is
installed securely, replace the high voltage PWB.
Copy example Causes Check procedures/corrective measures
Deteriorated toner. Perform the drum refresh operation (see page 1-3-105).
Dirty main charger wire. Clean the wire or, if it is extremely dirty, replace it.
Copy example Causes Check procedures/corrective measures
Foreign matter in the developing unit. Check if the magnetic brush is formed uniformly. If not,
replace the developer.
Flawed drum. Replace the drum (see page 1-5-44).
Dirty shading plate. Clean the shading plate.
Dirty DP separation roller. Clean the DP separation roller.
Foreign matter in the laser scanner
unit.
Replace the laser scanner unit (see page 1-5-36).
Dirty CIS or CIS roller. Clean the CIS or CIS roller.
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