Ricoh Aficio SP C231, Service Manual, Page: 73 / 247

DRUM
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SM C231
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2.5.6 DETECTION OF MASTERS ON THE DRUM
The drum master sensor [B] detects whether a master is on the drum.
When there is a master on the drum, the black patch [A] is covered and the sensor
detects the light reflected from the master. Printing starts when the start key is
pressed. (If a new original is set, the master ejecting cycle is performed before
making a new master.)
When there is no master on the drum, the black patch [A] is exposed. The black
patch does not reflect light back to the sensor. Because of this, the master eject
process is skipped when a new master is made.
C231D571.WMF
[A]
[B]