Olympus OEP-3 Service Manual page 139

1. Platen home position sensor
Route: SE-540 to SE-539 to PRT-13
TP: TP558/PRT-13 board
Function: Discriminates the home position of a platen.
Level: H Home position
L Positions other than home position
SE-540
1 3
C2 C1
0.01uF
0.01uF
PH1
NM
NM
RPI-352
2 4
2. Ribbon take-up FG sensor
Route: SE-545 to SE-539 to PRT-13
TP: TP513/PRT-13 board
Function: Detects the number of rotations on the take-up side of a ribbon.
Level: Rectangular wave output
SE-545
1 3
C14 C13
PH7
0.01uF
0.01uF
RPI-325
NM
NM
2 4
3. Ribbon supply FG sensor
Route: SE-546 to SE-539 to PRT-13
TP: TP514/PRT-13 board
Function: Detects the number of rotations on the supply side of a ribbon.
Level: Rectangular wave output
SE-546
1 3
C15
C16
PH8 0.01uF
0.01uF
NM
RPI-352 NM
2 4
OEP-3 V1 (UC)
SE-539 PRT-13
+5V
R152
150
CN1 CN101
1P 1P CN150 CN401
2P 2P 6P 25P
3P 3P
GND
SE-539 PRT-13
+5V
R153
150
CN6 CN101
1P 4P CN150 CN401
2P 5P 13P 18P
3P 6P
GND
SE-539 PRT-13
+5V
+5V
R157
150
CN7 CN102
1P 6P CN150 CN401
2P 7P 14P 17P
3P 8P
GND
+5V
R566
10k
IC9
9 11
37P
IC452 (6/9)
SN74LV541ANSR
+5V
R527
10k
IC5
5 6
87P
IC4 (3/7)
SN74LV14ANSR
R528
10k
IC5
9
8
88P
IC4 (4/7)
SN74LV14ANSR
PLT_POS
RBN_TKUP_FG
RBN_SPLY_FG
4-31