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COPYRIGHT © 1996 CANON INC. CANON GP215/200 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
3. OPERATIONS AND TIMING
8
Checking the Photointerrupters
The photointerrupters may be checked either using a conventional tester or using service mode.
1. Using a Tester
1) Set the tester range to 12 VDC.
2) Connect the tester probe to GND (0 VDC) of the DC controller PCB.
3) Make checks as instructed.
2. Using Service Mode
1) Open the front door, and insert the door switch actuator into the door switch assembly; then, insert the
handle of the static eliminator cleaning brush into the fixing assembly releasing assembly.
2) Press the service switch.
3) Press the * key twice, and press ‘I/O DISPALY’ (*2*) to highlight; then, press the OK key.
4) Press the Page key to select the screen showing the desired address.
No.
Name
Tester probe
Service mode
Make checks; nor-
mal if as indicated.
Display reading
Tester reading
PS1
Scanner home posi-
tion sensor (SCHP)
J107-A2
—
Move the scanner
from home position
during standby.
PS2
Fixing film sensor
(FFD)
J109-3
DC PA0-bit0
Move the detecting
lever by hand dur-
ing standby.
PS3
Copyboard cover
open/closed sensor
(CBCC)
J113-B9
DC PA0-bit1
Open/close the
copyboard cover dur-
ing standby.
The scan-
ner is at
home
position.
—
about 5 V
The scan-
ner is not
at home
position.
—
about 0 V
The light-
blocking
plate is
present.
1
about 5 V
The light-
blocking
plate is
absent
0
about 0 V
The copy-
board
cover is
closed.
1
about 5 V
The copy-
board
cover is
opened.
0
about 0 V