Kyocera TASKalfa 420i, Service Manual

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2KR/2KS
1-4-50
(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 replenish-
ment, replace the container.
Deteriorated toner. Perform the drum refresh operation.
Defective
transfer
charging
output. The connector terminals
of the high voltage PWB
make poor contact. Reinsert the connector. Also check for continuity within the
connector cable. If none, remedy or replace the cable.
Defective engine PWB. Check if YC13-10 on the engine PWB goes low when main-
tenance item U101 is run. If not, replace the engine PWB.
Defective high voltage
PWB. Check if transfer charging takes place when CN1-10 on the
high voltage PWB goes low while maintenance item U101 is
run. If not, replace the high voltage PWB.
Copy example Causes Check procedures/corrective measures
Deteriorated toner. Perform the drum refresh operation.
Dirty main charger wire. Clean the wire or, if it is extremely dirty, replace it (see page
1-5-26).
Copy example Causes Check procedures/corrective measures
Foreign matter in the developing unit. Check if the magnetic brush is formed uniformly. Replace the
developing unit if any foreign matter (see page 1-5-28).
Dirty shading plate. Clean the shading plate.