Canon PC300 Service Manual page 39

OPERATIONS AND TIMING &
2. Controlling the Copyboard Drive
The copyboard is controlied for forward,
reverse, and stop operations by the copy-
board drive solenoid (SL2) and forward/
reverse switching mechanism.
A photosensor (Q902) is provided on the
copyboard drive assembly to monitor the
position of the copyboard; as the copyboard
moves, the cam found under the copyboard
pushes the copyboard sensor lever to turn
the photosensor ON or OFF.
J201 Copyboard drive gear
~10
Copyboard position sensor signal
J201
-9
DC controller/
DC power
supply PCB
J201
4
Copyboard drive solenoid drive command |
Main motor drive command (MMD)
'E2' is displayed if the copyboard fails to
complete its movement within a specific peri-
od of time.
In response to the signal from Q902, the
DC controller controls the timing for paper
transport and the movement (forward,
reverse, stop) of the copyboard; see Table 3-
2
Start position cam
Registration cam
Forward
Copyboard drive
solenoid
Hl
Forward\ Forward/Reverse Reverse'
gear Switching — gear
Figure 3-11 Front View
COPYRIGHT © 1904 CANON INC. CANON PC900/920/925, FC210/290 REV.0. JULY 1994 PRINTED IN JAPAN (IMPRIME AU JAPON)