Canon Vizcam 1000, Service Manual

Page: 194 / 840

3. OPERATION AND TIMING
COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-150
Moving the Lifter Down
• The paper deck cover must be open, i.e., the cover open signal (STDO) is ‘1’.
• The lifter lower limit switch (SW11) must be off, i.e., the lifter lower limit signal (LFLM) is ‘1’.
As a result of the above conditions, the output signals from the combination circuit will be as follows:
• The lifter up signal (STMUP) will be ‘0’.
• The lifter down signal (STMDN) will be ‘1’.
whereupon the lifter starts to move down.
In Response to a Jam
When a jam occurs, the lifter up/down control signal by the CPU changes from ‘0’ to ‘1’.
The condition causes the lifter up signal (STMUP) to go ‘0’ and the lifter down signal to go ‘1’, thereby
lowering the lifter. At this time, the lifter will not move down to its lowest position but will stop when the top
surface of paper lowers a maximum of about 12 mm.
Figure 3-619
Paper deck motor
M8001
SW8001
PS8002
SW8002
SW8003
+5V
+5V
+5V
Paper deck lifter
upper limit switch
Paper deck lifter
position sensor
Paper deck lifter
lower limit switch
Paper deck cover
open/closed
detection switch
Motor drive IC
Combination
circuit
Over current
detection
circuit
CPU
DC controller PCB
Lifter up signal (STMUP)
Lifter down signal (STMDN)
Lifter position signal (LTP)
Lifter lower limit signal (LFLM)
Cover open signal (STDO)
Motor ON
control signal
Lifter up/down
control signal
J2223A
-4
-5
-8
-9
-10