Kyocera FS-6025MFP/B Service Manual page 139

Code Contents
6000/ Broken fuser heater wire
6020/ Abnormally high fuser
6030/ thermistor temperature
6050 Broken fuser thermistor
Com- wire
bined Abnormally low fuser
thermistor temperature
6400 Zero-cross signal error
While fuser heater control is
performed, the zero-cross sig-
nal is not input within 3 s.
7800 Broken external thermistor
wire
The thermistor output value is
0.3 V or less.
Causes
Deformed connec- If the I/F connector pins of the fuser unit and
tor pin. the main unit are deformed owing to foreign
matters, such as paper dusts, replace the
connectors or the units including the con-
nectors.
Defective triac. Remove the power cord and check that the
resistance between terminals T1 and T2 of
the triac TRA51 is of several Mega-Ohms
and not shorted (see figure 1-4-2). If failed,
replace the power source PWB (see page 1-
5-34).
T1
T2
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector. Power source PWB (YC4) and engine PWB
(YC21)
Defective power Replace the power source PWB or the
source PWB or engine PWB and check for correct operation
engine PWB. (see page 1-5-34).
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector. Temperature sensor and engine PWB
(YC21)
Defective tempera- Replace the temperature sensor.
ture sensor.
1-4-15
Check procedures/
corrective measures
TRA51
Power source PWB
Figure 1-4-2
2K3/2L3