Sony UP-55MD Service Manual page 69

Jamming sensor (Back edge detection of paper)
Type: Transmission sensor
Function: Detects that paper is not clogged inside a mechanical block in the standby mode.
Detects the paper in each timing during paper load and return.
Level: IC301, pin 87 on the MA-142 board
H (Analog level) = Paper provided
L (Analog level) = Paper not provided
+5V
R114
Q102
R116
R113
R115
TO
CN803/MA-142
16 pin
Q101
GND
MA-142
_
PP_F_EDGE
+
(IC301 174pin)
_
PP_B_EDGE
+
(IC301 87pin)
_
RBN_MARK
+
(IC301 43pin)
_
PP_IN
+
(IC301 175pin)
UP-55MD
MEC-24
+2.5V
R714
C91
Q91 D81
GND
+2.5V
R715
C131
Q131 D121
GND
+2.5V
R716
C61
Q61 D71
GND
+2.5V
R717
C101
Q101 D161
GND
R81
C81
SE-750/749
GND
R121
C121
SE-754/753
GND
R71
C71
SE-747/748
GND
R161
C161
SE-751/762
GND
5-17