Kyocera FS-2020D Service Manual page 55

1-4-4 Electric problems
Problem
(1)
Defective waste
toner box detecting.
(2)
Defective paper jam
detecting.
Paper jam frequently
occurs.
False paper jam
message display.
(3)Defective paper
gauge sensing.
False paper gauge
indication.
(4)Defective paper
size detecting.
False paper size
message display.
(5)
Defective message
displaying (LCD) [1].
No message appears
on the message dis-
play (LCD), though
the message back-
ground is faintly illu-
minated. (Power is
supplied to the oper-
ation panel PWB.)
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Causes
Defective waste toner sen-
sor.
Defective connection
between drum PWB (YC1)
and connect-L PWB (YC3).
Defective harness between
connect-L PWB (YC6) and
engine PWB (YC504), or
improper connector inser-
tion.
Defective engine PWB.
Defective registration sen-
sor or duplex jam sensor.
Defective paper exit sensor,
duplex sensor or face down
tray paper full sensor.
Actuators of registration
sensor, duplex jam sensor,
duplex sensor or face down
tray paper full sensor does
not operate smoothly.
A piece of paper torn from a
sheet is caught around
actuator of registration sen-
sor, paper exit sensor,
duplex sensor, duplex jam
sensor or face down tray
paper full sensor.
Defective engine PWB.
Defective paper gauge sen-
sor 1 or 2.
Actuator of paper gauge
sensor 1 and 2 does not
operate smoothly.
Defective engine PWB.
Defective cassette size
switch.
Defective engine PWB.
Defective harness between
operation panel PWB (YC1)
and main PWB (YC7), or
improper connector inser-
tion.
Defective operation panel
PWB.
Defective main PWB.
Defective operation panel
PWB.
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Check procedures/corrective measures
Replace the drum unit (See page 1-5-12).
Check the connection of connectors between drum PWB (YC1)
and connect-L PWB (YC3).
(See page 1-4-10, refer to figure 1-4-5)
Reinsert the connector. Also check for continuity within the con-
nector harness. If none, remedy or replace the harness.
Replace the engine PWB (See page 1-5-25).
Replace the engine PWB (See page 1-5-25).
Replace the paper exit sensor, duplex sensor or face down tray
paper full sensor.
Repair or replace.
Check visually and remove it, if any.
Replace the engine PWB (See page 1-5-25).
Replace the engine PWB (See page 1-5-25).
Repair or replace.
Replace the engine PWB (See page 1-5-25).
Replace the cassette size switch.
Replace the engine PWB (See page 1-5-25).
Reinsert the connector. Also check for continuity within the con-
nector harness. If none, remedy or replace the harness.
Replace the operation panel PWB.
Replace the main PWB (See page 1-5-30).
Replace the operation panel PWB.
2J0/2J1/2J2
1-4-15