Ricoh SP 3710DN - Page 188

6.Troubleshooting
176
No.
Type
Error Name/Error Condition/Major Cause/Solution
 Deformed thermistor
 Thermistor not in the correct position
 Defective fusing lamp
1. Reset the SC.
2. Replace the fusing unit.
3. Replace the drawer harness.
4. Replace the PSU.
No.
Type
Error Name/Error Condition/Major Cause/Solution
SC546
D
Unstable fusing thermistor temperature
While the machine is warming-up or printing, the detected temperature stays at
100℃ or less than the target temperature for 5.2 seconds, and this consecutively
occurs 104 times.
Unstable connector contact of fusing thermistor
None
No.
Type
Error Name/Error Condition/Major Cause/Solution
SC547
D
Zero cross error
 The zero cross signal is detected 3 times even though the fusing lamp relay is
off when turning on the main power.
 The number of zero cross signal interrupts do not reach a specified value during
frequency detection.
 The zero cross signal is not detected for 3 seconds even though the fusing lamp
relay is on.
 Defective fusing relay
 Defective fusing relay circuit
 Unstable frequency of the power supply line
1. Check the power supply source.
2. Replace the PSU
No.
Type
Error Name/Error Condition/Major Cause/Solution
SC551
A
Non-contact thermistor error
The thermistor output is less than 0°C for 5 seconds after the fusing lamp turns ON.
Disconnected or defective non-contact thermistor
1. Reset the SC.
2. Replace the fusing unit.
3. Replace the drawer harness.