Vacuum Unit Drive Mechanism - Ricoh VT3500 Service Manual

1 December 1993

7.3 VACUUM UNIT DRIVE MECHANISM

[G]
The vacuum fan [E] holds the paper against the transport belts [D]. The
transport belts move the paper to the delivery table.
Wing guides [C] at each end of the vacuum unit helps keep the back side of
the printing paper clean.
When the main motor turns on, the gear [G] mounted on the main motor shaft
drives a drive shaft [F] through gears and belts. This drive shaft turns the
transport belts.
The first and second paper exit sensors [A] and [B] check for paper jams.
The paper exit jam check is done when printing pressure is applied and the
printing pressure sensor is interrupted.
Jam Condition
Delivery Misfeed 2nd paper exit sensor is still on when the 2nd drum
Paper Wrap
Paper Wrap
[F]
position sensor turns on.
1st paper exit sensor fails to turn on even though the
drum has rotated 20° after activating the 2nd drum
position sensor.
2nd paper exit sensor fails to turn on even though the
drum has rotated 25° after activating the 1st drum
position sensor.
2-80
[E]
Sensor Status
[A]
[B]
[C]
[D]