Olympus OEP-3 Service Manual page 140

4. Ribbon cartridge sensor
Route: SE-544 to SE-539 to PRT-13
TP: TP510/PRT-13 board
Function: Discriminates whether a ribbon cassette is inserted into the mechanical unit.
Level: H A ribbon cassette is set.
L A ribbon cassette is not set.
SE-544
CN5
D2
PH6
GL480
C12
PT480F C10
0.01uF 0.01uF
NM NM
5. Head position sensor
SE-547
1 3 1 3
PH10
PH9
RPI-352
RPI-352
C20
0.01uF
NM
2 4 2 4
1 3 1 3
PH12
PH11
RPI-352
RPI-352
C24
0.01uF
2 4 2 4
NM
Route: SE-547 to SE-539 to PRT-13
TP: TP555, TP556, TP560, and TP561/PRT-13 board
Function: Discriminates the thermal head position.
Level:
Sensor position
PRINT
PFEED
FF2
FF1
HOME
CHUCK
4-32
SE-539 PRT-13
+5V
+5V
R156
220
CN102
2P 2P
CN150 CN401
4P 4P 9P 22P
IC406
SN74LV541ANSR
5P 5P
GND
CN8
1P
2P
C19 C18 C17
3P
0.01uF 0.01uF 0.01uF
NM
NM NM 4P
5P
6P
7P
8P
9P
C23 C22 C21
0.01uF 0.01uF 0.01uF
NM
NM NM
10P
HED_POS0 HED_POS1
(IC9, pin 43) (IC9, pin 42)
L L
L L
L H
L H
H L
H L
R524
10k
IC9
3 17
36P
(2/9)
SE-539
+5V +5V +5V +5V
R163 R166
R164 R165
150 150
150 150
CN105
1P CN150
2P 2P
3P 3P
4P 4P
5P 5P
6P
7P
8P
9P
10P
GND
HED_POS3 HED_POS3
(IC9, pin 41) (IC9, pin 40)
L L
H L
L L
H L
L L
H L
RBN_CST
PRT-13
+5V +5V +5V
R566 R569 R571
10k 10k 10k
(1/9)
IC452
SN74LV541ANSR
IC452 (2/9)
SN74LV541ANSR
CN401
IC9
29P 3 17
43P
28P 8
12
42P
27P 7
13
41P
26P 6
14
40P
IC452 (3/9)
SN74LV541ANSR
R572
IC452 (7/9)
10k
SN74LV541ANSR
+5V
HED_POS
OEP-3 V1 (UC)