Canon CLC1000 Service Manual page 106

The pattern reading assembly is equipped with a shutter (Figure 3-428) to prevent soiling with toner.
The shutter is driven by the shutter drive motor, and the open/closed positions detected by the shutter
open/closed sensor.
See Figure 3-429 for the sequence of operations. In sync with the image position correction movement,
the shutter drive motor remains on for 5 set to move the shutter to the open position. After reading eight
sets of patterns, the shutter drive motor remains on for 5 set once again to move the shutter to the closed
position.
If the shutter open sensor dose not detect the light-blocking plate when the shutter must open while the
motor is at rest, 'E194-0001' will be indicated on the control panel. If the shutter must close, 'E194-0002'
will be indicated on the control panel.
Figure 3-428
Y
1 St se1
Figure 3-429
CANON CLClOOO REV.1 MAY 1987 PRINTED IN JAPAN (IMPRIME AU JAPON)
3. OPERATIONS AND TIMING -
Shutter closed sensor /
Y
8th set