Ricoh D131 Service Manual page 491

SC400: Image Development 2
SC495-00 D
SC496-00 D
D131/D132/D133
Toner recycling unit error
Encoder pulse does not change for 3 s after the main motor
switches on.

Waste toner transport has stopped due to motor overload

Toner end sensor detective, disconnected
Toner collection bottle error
The toner collection bottle set switch remains off when the front
door is closed.

No toner collection bottle set

Poor connection of the switch connector
2-24 SM Appendix