Ricoh P C300W Field Service Manual page 226

6.Troubleshooting
SC No. Type
4.
5.
SC No. Type
SC572- D No reload temperature of the pressure roller thermistor (end) (TH4): Low voltage
12
After turning the fusing lamp ON, the pressure roller thermistor (end) has failed to
reach -40 °C continuously for 30 seconds. AND the power supply voltage is lower
than specified voltage.
•
•
•
•
Check if the SC occurs by turning the power OFF then ON. If the SC occurs again,
do the following steps. Check if the SC reoccurs by cycling the power after each
step.
1.
2.
3.
4.
5.
6.
SC No. Type
SC573- A High-temperature software error (pressure roller thermistor (end) (TH4))
00
After turning the fusing relay ON, the pressure roller thermistor (end) has detected
over 248 °C continuously for 1 second.
•
•
•
Enter the SP mode and execute fuser SC reset. Then turn the machine OFF and
ON.
If the SC occurs again, do the following steps. Check if the SC reoccurs by cycling
the power after each step.
1.
2.
3.
214
Error Name/Error Condition/Major Cause/Solution
Replace the fusing unit.
Replace the EGB (PCB1) or/and the PSU (PCB4).
Error Name/Error Condition/Major Cause/Solution
Thermistor is deformed or not in contact
Power supply voltage low
Overheating protection device triggered (blown fusing thermostat)
Fusing drive non-rotation
Check the input power source and reconnect the cable to the outlet.
Replace the pressure roller thermistor (end) (TH4).
Replace the fusing thermostat (TH1).
Replace the fusing unit.
Replace the EGB (PCB1) or/and the PSU (PCB4).
If the problem is low voltage, ask the client to connect the machine directly to
a rated power source and to refrain from using extension cords.
Error Name/Error Condition/Major Cause/Solution
TRIAC short
EGB (PCB1) defective
Pressure roller thermistor (end) (TH4) defective
If TRIAC damaged, replace PSU (PCB4).
Replace the EGB (PCB1).
Replace the Pressure roller thermistor (end) (TH4).