Sensor Detection Circuits - Sony OEP-4 Service Manual

5-5-2. Sensor Detection Circuits

The types of sensors used in this unit are as follows:
A transmission sensor can perform A/D conversion input and correspond to the change with the passage
of time in a sensor level.
Photointerrupter sensor
. Head position sensor
. Eject flap sensor
Mechanical sensor
. Front panel open detection sensor
. Interlock sensor
Transmission sensor
. Paper-in sensor
. Paper feed sensor (Front edge detection of paper)
. Jamming sensor (Back edge detection of paper)
. Ribbon cue-up detection sensor
Head position sensor
Type: Photointerrupter sensor
Function: Discriminates the position of a thermal head.
Level: Discriminated as shown below.
Head home Standby
Head down Paper feed
Head down Ribbon Y cue-up and paper cue-up
Head down Y print
Head up Ribbon M cue-up and paper return
Head down M print
Head up Ribbon C cue-up and paper return
Head down C print
+ 5V
R114
R116
R113
R115
TO
CN-803/MA-130
16 pin
Q101
GND
5V
+
IC301
R111 R112
C113
GND GND
MA-142G
OEP-4
Q102
C51
GND
C52 VDR51
NM
C114
MEC-24G
POSITION0 of POSITION1 of
IC301, pin 53 IC301, pin 53
L L
L H
L H
L H
L H
L H
L H
L H
R51
PH51
1 3
C53 VDR52
NM
2 4
R52
PH52
1 3
2 4
SE-746
5-13