2H9
1-4-8
6030 Broken fuser thermistor wire
Input from fuser thermistor is 0 (A/D
value).
Poor contact in the
fuser thermistor
connector termi-
nals.
Reinsert the connector (See page 1-5-34).
Broken fuser ther-
mistor wire.
Replace the fuser unit (See page 1-5-34).
Fuser thermistor
installed incor-
rectly.
Replace the fuser unit (See page 1-5-34).
Fuser thermal cut-
out triggered.
Replace the fuser unit (See page 1-5-34).
Fuser heater lamp
installed incor-
rectly.
Replace the fuser unit (See page 1-5-34).
Broken fuser
heater lamp wire.
Replace the fuser unit (See page 1-5-34).
6400 Zero cross signal error
The zero cross signal does not reach the
control PWB for specified time.
Defective harness
between high volt-
age PWB (YC202)
and control PWB
(YC23), or
improper connec-
tor insertion.
Reinsert the connector. Also check for conti-
nuity within the connector harness. If none,
remedy or replace the harness (See page 1-
5-34).
Defective connec-
tion between
power source PWB
(YC103) and high
voltage PWB
(YC201).
Reinsert the connector.
Defective power
source PWB.
Replace the power source PWB (See page
1-5-42).
Defective control
PWB.
Replace the control PWB (See page 1-5-
39).
7990 Waste toner full
The waste toner sensor has detected
that the waste toner reservoir (drum unit)
is full.
Waste toner reser-
voir (drum unit) is
full.
Turn the main power switch off/on to restart
the printer. If the error is not resolved,
replace the drum unit (See page 1-5-30).
Defective waste
toner sensor.
Replace the waste toner sensor.
Defective control
PWB.
Replace the control PWB (See page 1-5-
39).
F000 Control PWB - Operation panel PWB
communication error
Defective harness
between operation
panel PWB (YC1)
and control PWB
(YC7), or improper
connector inser-
tion.
Reinsert the connector. Also check for conti-
nuity within the connector harness. If none,
remedy or replace the harness.
Defective opera-
tion panel PWB.
Replace the operation panel PWB.
Defective control
PWB.
Replace the control PWB (See page 1-5-
39).
Code Contents
Remarks
Causes Check procedures/corrective measures
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