Detection Of Masters On The Drum - Ricoh C231 Service Manual

6.8.6 DETECTION OF MASTERS ON THE DRUM

[C]
[A]: Drum master sensor
[B]: Black patch on the screen
[C]: Black patch on the clamper
• The drum master sensor [A] detects whether there is a master on the drum.
• When there is a master on the drum, the black patch [B] is covered and the
sensor detects the light reflected from the master. When there is no master on
the drum, the black patch [B] is exposed. The black patch does not reflect light
back to the sensor. Because of this, the master eject process can be skipped
when a new master is being made, if no master is detected on the drum.
• There is a black patch [C] on the clamper. If a master covers this black patch,
there was an error during cutting, and because of this error the master is double-
wrapped around the drum.
SM
C267D945.WMF
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DRUM
[B]
[A]
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