Kyocera Ecosys FS-6970DN, Service Manual, Page: 54 / 126

2J5
1-4-14
1-4-4 Electric problems
Problem Causes Check procedures/corrective measures
(1)
Defective waste
toner box detecting. Defective waste toner sen-
sor. Replace the drum unit (See page P.1-5-12).
Defective connection
between drum PWB (YC1)
and connect-L PWB (YC3). Check the connection of connectors between drum PWB (YC1)
and connect-L PWB (YC3).
(See page P.1-4-10, refer to figure 1-4-5)
Defective harness between
connect-L PWB (YC6) and
engine PWB (YC504), or
improper connector inser-
tion. Reinsert the connector. Also check for continuity within the con-
nector harness. If none, remedy or replace the harness.
Defective engine PWB. Replace the engine PWB (See page P.1-5-23).
(2)
Defective paper jam
detecting.
Paper jam frequently
occurs.
False paper jam
message display. Defective registration sen-
sor or duplex jam sensor. Replace the engine PWB (See page P.1-5-23).
Defective paper exit sensor,
duplex sensor or face down
tray paper full sensor. Replace the 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. Repair or replace.
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. Check visually and remove it, if any.
Defective engine PWB. Replace the engine PWB (See page P.1-5-23).
(3)Defective paper
gauge sensing.
False paper gauge
indication. Defective paper gauge sen-
sor 1 or 2. Replace the engine PWB (See page P.1-5-23).
Actuator of paper gauge
sensor 1 and 2 does not
operate smoothly. Repair or replace.
Defective engine PWB. Replace the engine PWB (See page P.1-5-23).
(4)Defective paper
size detecting.
False paper size
message display. Defective cassette size
switch. Replace the cassette size switch.
Defective engine PWB. Replace the engine PWB (See page P.1-5-23).
(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.) Defective harness between
operation panel PWB (YC1)
and main PWB (YC7), or
improper connector inser-
tion. Reinsert the connector. Also check for continuity within the con-
nector harness. If none, remedy or replace the harness.
Defective operation panel
PWB. Replace the operation panel PWB.