Toner End Sensor Circuit - Ricoh M5 Service Manual

8. Toner End Sensor Circuit

The CPU monitors the toner end sensor to determine whether a toner end condition exists. If
CN103-8 drops to LOW three of more times during machine cycle, the CPU stops the copier and
lights the Add Toner indicator.
– Service Call Condition –
The CPU also monitors the toner end sensor to detect malfunctions in the development unit. if
CN103-8 stays LOW during the start of the machine cycle, either the development unit is not installed
or the toner end sensor is defective.
Main Board
The CPU stops the copier and lights self-diagnostic code E3.
3 - 4 0
May, 25, 1985