Canon NP6621 Service Handbook page 36

STANDARDS AND ADJUSTMENTS
a. Copier
Notation
Name
(+) probe of meter
Service mode
Checks (normal if indi-
cated as right)
Display
Meter voltage reading
Notation
Name
(+) probe of meter
Service mode
Checks; normal if as
indicated.
Display
Meter measurements
2–22
PS1
Scanner home position sensor
(SCHP)
J315-B4
—
Move the scanner by hand while in
standby.
When the When the
scanner is at scanner is not at
home position home position
1
5 V (approx.) 0 V (approx.)
PS3
Blanking home position sensor
(BSHP)
J315-A5
No. 222 1-d
Remove the blank exposure
assembly. (Do not disconnect
J315). Move the blanking shutter.
When the light- When the light-
blocking plate is blocking plate is
present not present
1
5 V (approx.) 0 V (approx.)
Lens home position sensor (LHP)
No. 222 1-c
Move the lens mount by hand while
in standby.
When the light-
blocking plate is
present
0 1
5 V (approx.)
Cassette 1 paper sensor (CPD*)
No. 216 1-g
Slide out the cassette while in
standby.
When the
cassette is slid
out
0 0
—
PS2
J310-A2
When the light-
blocking plate is
not present
0
0 V (approx.)
PS4
J309-9
When paper is
placed in the
cassette and the
cassette is slid in
1
—