Main Heater Over Heat Failure - Panasonic DP-C321 Service Handbook

• Use of paper out of spec (Refer to Spec. Chapter 1
Specifications.)
3-65

010-348 MAIN HEATER OVER HEAT FAILURE

Description The FRONT THERMISTOR detected abnormal
high temperature.
To clear this fault, clear the value of DC131 [744-
003] to "0".
BSD on : CH10.1 CH10.8
Procedure
Turn Off the power, remove the FUSER ASSY, and allow it to
cool down.
Measure the resistance between the FUSER ASSY Connectors
P600-4 (+) and P600-6 (-).
Is the resistance between 30 and 190 k Ohm?
Y N
Check the FRONT THERMISTOR in the FUSER ASSY
for an open circuit and poor contact. If no problems are
found, replace the FUSER ASSY.(PL7.1)
Reinstall the FUSER ASSY, turn On the power, and run DC140
[010-100].
Is the monitor value between 900 and 1000?
Y N
Turn Off the power and check the wire between the MCU
PWB J404-11 and the FRONT THERMISTOR J211-1 for
an open circuit and poor contact.
Is the open circuit or poor contact found?
Y N
Check the wire between the MCU PWB J404-12 and
the FRONT THERMISTOR J211-2 for an open
circuit and poor contact.
Is the open circuit or poor contact found?
Y N
Replace the MCU PWB. (PL13.1)
Repair the open circuit or poor contact.
Repair the open circuit or poor contact.
Measure the voltage between the MCU PWB J404-5 (+) and
GND (-)?
Is +5 VDC measured before a failure occurs?
Y N
Measure the voltage between the AC DRIVE PWB J590-5
(+) and GND (-).
Is +5 VDC measured before a failure occurs?
Y N
Replace the AC DRIVE PWB. (PL9.2)
Check for an open circuit and poor contact.
Replace the MCU PWB. (PL13.1)
Chapter 3 Troubleshooting