Canon PC800 Series Service Handbook page 57

5. Checking the Photointerrupters
1) Set the meter range to 12 VDC.
2) Connect the - probe to GND (CPGND1) on the DC controller PCB.
3) Make checks as instructed.
Reference:
The photointerrupers other than those shown in Table 2-8 are connected in a matrix, hence the
omission from the table.
Sensor
PS1
Scanner home position
sensor (SCHP)
PS2
Lens home position sen-
sor (LHP)
PS4
Vertical path roller pa-
per sensor (PDP)
Q751
Pre-registration roller
paper sensor (RPD)
CHAPTER 2 STANDARDS AND ADJUSTMENTS
VR104 VR105
VR106
VR107
Figure 2-71
Connector
J101-3 During standby, move
the scanner by hand.
J109-10 During standby, move
the lens mount by
hand.
J132-5 During standby, move
the detecting lever by
hand.
J108-3 During standby, move
the detecting lever by
hand.
Table 2-8
GND
Checks
When the light-block-
ing plate is at PS1,
When the light-block-
ing plate is not at PS1,
When the light-block-
ing plate is at PS2,
When the light-block-
ing plate is not at PS2,
When the light-block-
ing plate is at PS4,
When the light-block-
ing plate is not at PS4,
When the light-block-
ing plate is at Q751,
When the light-
blocking plate is not at
Q751,
Voltage
(approx.)
5V
0V
5V
0V
5V
0V
0V
5V
2-43