Canon iR8500 Service Manual page 677

SERVICE MODE
COPIER>I/O
<R-CON (2/3)>
Address bit
IO-P04 0 DDI-SPO (0)
1 DDI-SPO (1)
2 DDI-SPO (2)
3 not used
4 not used
5 not used
6 original sensor 3 signal (AB input)
7 original sensor 4 signal (Inch input)
IO-P05 0 DDI-SPRTST
1 serial data to CCD
2 clock to CCD
3 output to RING2
IO-P06 0 not used
1 PCB check mode (for factory)
2 scanning lamp (LOW/HI) switch signal
3 CS output to EEPROM
4 scanner HP sensor signal
5 ADF-ITOP (image leading edge) signal
6 copyboard cover sensor (used as interrupt)
7 copyboard cover sensor
IO-P07 0 WATCH-DOG pulse output
1 output to analog processor
2 DO signal from EEPROM
3-7 not used
IO-P08 0-7 not used
IO-P09 0 not used
1 not used
2 not used
3 not used
4 scanner motor drive control 2
5 scanner motor drive control 3
6 scanner motor drive control 4
7 scanner motor drive control (RETURN)
S-34
Description
COPYRIGHT© 2001 CANON INC.
Notation
not used
not used
not used
PS43 0: original present
PS43 0: original present
0: DDI-SPRTST signal ON
DATA area
when 0→1→0, data
transmitted
when 0→1→0, data
transmitted
0: check mode
LA2 not used
1: CP
PS39 1:HP
0: ADF original image
leading edge interrupt
PS40 1:ADF (copyboard) closed
PS40 1:ADF (copyboard) closed
normal clock
when 0
transmitted
Data area
M3 default setting
M3 default setting
M3 default setting
M3 default setting
2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001
Remarks
→1 → 0, data