Ricoh D072 Service Manual page 296

No.
Definition
Transfer roller leak error (positive electrode)
401 B
The feedback voltage of the transfer
roller is insufficient.
Transfer roller leak error (negative electrode)
402 B
The feedback voltage of the transfer
roller is insufficient.
Main motor error
The main motor does not reach its
operation speed within 0.7 second.
500 B
Or, the main motor remains out of its
operation speed for 0.7 second after
reaching the operation speed.
Fusing thermistor open error
The fusing temperature remains
541 A
lower than the specified temperature
by 20 degrees Celsius.
SM Appendix
Symptom
3-41
SC Tables (Basic: D067/D072)
Possible Cause
Defective high voltage supply
board
Loose connection of the PCU
Incorrect installation of the
transfer unit or the separation
unit
Defective transfer roller
Defective high voltage supply
board
Loose connection of the PCU
Incorrect installation of the
transfer unit or the separation
unit
Defective transfer roller
Overload
Defective main motor
Defective thermistor
Incorrect installation of the
thermistor
Defective power supply unit
Loose connectors
D067/D068/D069/D072