2PK/2PL/2PM/2PN
1-4-15
6400 Zero cross signal error
The zero cross signal does not
reach the control PWB for specified
time.
Defective har-
ness between
high voltage
PWB (CN202)
and control PWB
(YC23), or
improper con-
nector insertion.
Reinsert the connector. Also check for
continuity within the connector har-
ness. If none, remedy or replace the
harness (See page 1-5-37).
Defective con-
nection between
power source
PWB (YC103)
and high voltage
PWB (CN201).
Reinsert the connector.
Defective power
source PWB.
Replace the power source PWB (See
page 1-5-40).
Defective control
PWB.
Replace the control PWB (See page 1-
5-37).
7990 Waste toner full
The waste toner sensor has
detected that the waste toner reser-
voir (drum unit) is full.
Waste toner res-
ervoir (drum unit)
is full.
Turn the power switch off/on to restart
the machine. If the error is not resolved,
replace the drum unit (See page 1-5-
28).
Defective waste
toner sensor.
Replace the waste toner sensor.
Defective control
PWB.
Replace the control PWB (See page 1-
5-37).
Code Contents
Remarks
Causes
Check procedures
/corrective measures
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