Service manual

READ SECTION
2-C-6
2 UNIT EXPLANATION
(2) Platen mode
The paper size is detected according to the com-
bination of ON/OFF states of PS62 (APS 1),
PS63 (APS 2), PS64 (APS 3), PS65 (APS 4),
PS66 (APS 5), PS67 (APS 6), and PS68 (APS
7).
The APS sensor consists of LEDs and photosen-
sors. Lights emitted from the LEDs is reflected by
the original and received by photosensors.
Relationships between sensors and original
sizes are as follows:
z ON
OFF
b. APS detection timing
The APS detection timing differs between the
platen mode and DF mode.
(1) DF mode
When the DF mode is selected or original is set
on the RADF original feed tray, APS detection
takes place using PS302 (original size detection
1), PS303 (original size detection 2), and VR301
(original size detection).
(2) Platen mode
When RADF is closed and PS315 (APS timing)
turns ON, APS detection takes place using PS62
to PS68.
2. Signals
a. Input signals
(1) PS62 (PS62 to ICB IFB)
Paper size detection signal.
[L]: Paper is detected.
[H]:Paper is not detected.
(2) PS63 (PS63 to ICB IFB)
Paper size detection signal.
[L]: Paper is detected.
[H]:Paper is not detected.
(3) PS64 (PS64 to ICB IFB)
Paper size detection signal.
[L]: Paper is detected.
[H]:Paper is not detected.
(4) PS65 (PS65 to ICB IFB)
Paper size detection signal.
[L]: Paper is detected.
[H]:Paper is not detected.
(5) PS66 (PS66 to ICB IFB)
Paper size detection signal.
[L]: Paper is detected.
[H]:Paper is not detected.
(6) PS67 (PS67 to ICB IFB)
Paper size detection signal.
[L]: Paper is detected.
[H]:Paper is not detected.
(7) PS68 (PS68 to ICB IFB)
Paper size detection signal.
[L]: Paper is detected.
[H]:Paper is not detected.
Sensor
Paper
size
PS62 PS63 PS64 PS65 PS66 PS67 PS68
B5R
z
B5
zzz
B4
zzzzz
A4R
zzz
A4
zzzzz
A3
zzzzzzz
8.5 x 11R
zz
8.5 x 11
zzzz
8.5 x 14
zz z z
11 x 17
zzz zzz
Min. size
PS63 PS62 PS68
PS66
PS64
PS67
PS65
Paper exit side
Photo sensor
LED
Di850g.book6ページ２００２年７月１２日 金曜日 午前８時３６分