Minolta Di850 Service Manual page 51

READ SECTION
(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:
Sensor
PS62 PS63 PS64 PS65 PS66 PS67 PS68
Paper
size
B5R
B5
B4
A4R
A4
A3
8.5 x 11R
8.5 x 11
8.5 x 14
11 x 17
Min. size
PS63 PS62 PS68
PS66
PS64
PS67
PS65
Photo sensor
LED
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.
2-C-6