Ricoh DD 4450 Service Manual page 181

Component
Interlock Switch
SM
Condition
The "Lower Master Tray is Open" indicator
OFF
is lit.
Can operate the Vacuum fan, clamper,
ON Blower fan motor, Eject roller, Pressure
plate and drum if there is no Eject box.
An SC is displayed for the clamper,
OFF pressure plate, or drum when the main
switch is turned on.
6-17
Electrical Component Defects
Symptom
C279