Sc 4Xx (Image Transfer And Transfer Error); Sc 5Xx (Motor And Fusing Error) - Ricoh M156 Service Manual

Service Call

SC 4xx (Image Transfer and Transfer Error)

Bias leak
An error signal is detected for 0.2 seconds when changing the development unit.
491

Defective transfer roller

Defective HVP pack
1. Turn the machine's main power off, and then on.

SC 5xx (Motor and Fusing Error)

Main motor error
The machine does not detect a main motor lock signal within 2sec after the main
motor started to rotate.
-or-
The machine does not release a main motor lock signal within 2sec after the main
motor switched off.
-or-
The machine detects a main motor lock signal every 100ms for seven times
500
consecutively, after the main motor started to rotate stably.

Overload of

Torque load overload

Defective main motor

Disconnect or defective motor harness
1. Turn the machine's main power off, and then on.
2. Check or replace the main motor if the torque load is normal.
3. Replace the motor harness.
Exhaust fun Error
The FAN lock signal – High for 10 seconds, after the fan motor started to rotate.
530

Disconnected or defective motor harness.
1. Turn the machine's main power off, and then on.
541 Fuser thermistor error
M156/M157/M176/M177 6-4 SM