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50 MFP unit explanation ENWW
PS309 (original size/2), PS310
(original size/1), and VR301 (original
size).
2 Platen mode
When the ADF is closed and PS51
(APS timing) turns on, L1 (exposure
lamp) turns on and the CCD detects
the reflected light to detect the
original size in the main scanning
direction. Since ADF is still open at
this time, the black level of the sky
shot (outside the original) and the
white level of the original (inside the
original) are detected according to
whether an original is present. At this
time, the original size in the
sub-scanning direction is detected
using PS63 to PS65 (APS/1 to
APS/3). When the ADF is closed
completely and PS311 (ADF
open/close) turns on, CCD reads the
white level of the platen cover and the
black level in the original. Among the
two original sizes detected as
discussed above, the larger size is
determined as the original size in the
main scanning direction.
2 Signals
a Input signals
1 APS_TIM (PS51 to SCDB)
ADF open/close detection signal
[L]: ADF is closed.
[H]: ADF is open.
2 APS.1/APS.1_SIG (PS63 to SCDB to
ICB)
Paper size detection signal
[L]: Paper is detected.
[H]: Paper is not detected.
3 APS.2/APS.2_SIG (PS64 to SCDB to
ICB)
Paper size detection signal
[L]: Paper is detected.
[H]: Paper is not detected.
4 APS3/APS.3_SIG (PS65 to SCDB to
ICB)
Paper size detection signal
[L]: Paper is detected.
[H]: Paper is not detected.
5 SIZE_PS_L (PS309 to SCDB to ICB)
Paper size detection signal
[L]: Paper is detected.
[H]: Paper is not detected.
6 SIZE_PS_S (PS310 to SCDB to ICB)
Paper size detection signal
[L]: Paper is detected.
[H]: Paper is not detected.
7 SIZE_ANA (PS301 to SCDB to ICB)
Paper size detection signal
[L]: Paper is detected.
[H]: Paper is not detected.
8 COVER_SIG (SCDB to ICB)
Same as APS TIM signal.
9 APS_TIMING (SCDB to PRCB)
Same as APS TIM signal.
b Output signals
1 APS_CONT
This signal controls on/off states of
APS_5V power for driving PS63,
PS64, and PS65 (APS1 to APS3).
[L]: APS_5V off
[H]: APS_5V on