Ricoh SP 3710DN - SC 4 Xx (Image Transfer and Transfer Errors); SC 5 Xx (Motor and Fusing Errors)

6.Troubleshooting
173
No.
Type
Error Name/Error Condition/Major Cause/Solution
SC268
D
Laser unit thermistor error
 The laser unit thermistor detected a temperature lower than -30°C for more than
4 sec.
 The laser unit thermistor detected a temperature higher than 105°C for more
than 1 sec.
 Thermistor disconnected (causes an extremely low temperature reading)
 Defective harness
 Defective main board
1. Turn the power OFF and ON.
2. Replace the laser unit thermistor.
SC 4xx (Image Transfer and Transfer Errors)
No.
Type
Error Name/Error Condition/Major Cause/Solution
SC491
D
Bias leak
An error signal is detected for 0.2 seconds when changing the development unit.
 HVP harness damaged and short circuited
 Defective the HVP
 AIO terminal damaged and short circuited
1. Turn the power OFF and ON.
2. Replace the main board.
3. Replace the transfer roller.
4. Replace the interface harness of the HVP.
5. Replace the HVP.
SC 5xx (Motor and Fusing Errors)
No.
Type
Error Name/Error Condition/Major Cause/Solution
SC520
D
Main motor error
 The machine does not detect a main motor lock signal within 2 seconds after
the main motor started to rotate.
 The machine does not release a main motor lock signal within 2 seconds after
the main motor switched off.
 The machine detects a main motor lock signal every 100 msec. for seven times
consecutively, after the main motor started to rotate stably.
 Torque overload