2M4/2M5/2M6/2M7-1
1-4-8
6020 Abnormally high fuser
thermistor temperature
Fuser thermistor detects a
temperature higher than
210°C/410°F for 3 seconds
Deformed connec-
tor pin.
If the I/F connector pins of the fuser unit and
the main unit are deformed owing to foreign
matters, such as paper dusts, replace the
connectors or the units including the con-
nectors.
Shorted fuser
thermistor.
Replace the fuser unit (see page 1-5-17).
Defective power
source PWB.
Replace the power source PWB
(see page 1-5-18).
Defective main
PWB.
Replace the main PWB and check for cor-
rect operation (see page 1-5-18).
6030 Broken fuser thermistor
wire
Average input AD given by the
thermistor is less than 2 for
300msec.
Defective connec-
tor cable or poor
contact in the con-
nector.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Fuser unit and main PWB (YC15)
Broken fuser
thermistor wire.
Replace the fuser unit (see page 1-5-17).
Fuser thermostat
triggered.
Replace the fuser unit (see page 1-5-17).
Defective main
PWB.
Replace the main PWB and check for cor-
rect operation (see page 1-5-18).
6400 Fixing control zero cross
signal error
The ZCROSS signal does not
reach the main PWB for more
than 2 seconds.
Defective connec-
tor cable or poor
contact in the con-
nector.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Power source PWB (YC103) and main PWB
(YC12)
Defective power
source PWB.
Replace the power source PWB
(see page 1-5-18).
Defective main
PWB.
Replace the main PWB and check for cor-
rect operation (see page 1-5-18).
F000 Communication Error
between Main PCB and
Panel PCB
Communication failure during
the start-up or operation.
* : Only 3 in 1 25/26 ppm
model, 4 in 1 20/21,
25/26 ppm model
Defective main
PWB.
Turn the main power switch off/on to restart
the machine. If the error is not resolved,
replace main PWB (see page 1-5-18).
Defective opera-
tion PWB.
Replace the scanner unit and check for cor-
rect operation (see page 1-5-10).
F020
RAM R/W error
The average AD value of the
sensor input is smaller than 2
during SLP_RLY is off and
300 ms.
Defective main
PWB.
Turn the main power switch off/on to restart
the machine. If the error is not resolved,
replace main PWB (see page 1-5-18).
Code Contents Causes
Check procedures/
corrective measures
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