Sc 4Xx (Image Transfer And Transfer Error); Sc 5Xx (Motor And Fusing Error) - Ricoh M118 Service Manual

Laser Scanning Unit thermistor error
At power on, the temperature sensor in the optics unit detected a temperature
lower than -30°C for more than 4 sec.
-or-
It detected a temperature higher than 105°C for more than 1sec.
268

Thermistor disconnected (causes extremely low temperature reading)

Thermistor damaged and short circuited (causes extremely high temperature
reading)
1. Turn the machine's main power off, and then on.
2. Replace the thermistor.

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 high voltage power 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-
500
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
consecutively, after the main motor started to rotate stably.
SM 6-3
Service Call Conditions
M118/M119