Olympus OEP-3 Service Manual page 137

5. Head motor drive circuit
Motor drive circuit IC608 on the SE-539 board is controlled by the control signals at pins 93 and 94 of
IC5 (CPU) on the PRT-13 board.
SE-539
HED_MTR0 HED_MTR1
TP600 TP601
CN604
CL602
1P
2P
CL603
RY601
SL1
SL2
CL610
6. Platen motor drive circuit
The platen is driven from a stepping motor through a belt.
The excitation system of the stepping motor is based on one-/two- phase excitation. The control signals
of each phase (A, A, B, and B) are output at pins 2 to 5 of IC5 (CPU). Drive circuit IC602 on the SE-539
board drives the stepping motor by chopper drive.
By switching the control signals at pins 7 and 8 on the PRT-13 board, the reference voltage input to pins 3
and 14 of IC602 on the SE-539 board changes to control the torque of a motor.
SE-539
+24V
PLT_MTR
CN601
1P
CL604
2P
CL605
3P
CL606
4P
CL607
12 7
SLA7024M
5P
CL608
VSB VSA
6P 8 6
CL609
OUTA INA
1 5
OUTA INA
18 17
OUTB INB
11 16
OUTB INB
+5V
9
RSA
R605
47k 3
R602
REFA
47k
14
REFB
2
TDA
13 10
TDB RSB
GNDB GNDA
C602
C600
C603 C604
47uF 47uF 15 4
470pF
470pF
35V 35V
+24GND GND
OEP-3 V1 (UC)
HEAD_POSITION_MOTOR_BLOCK
+24V C609 C645
47uF 47uF
35V 35V
C606
0.1uF
50V
+24GND
D1
MA111-TX
2 4
7
C634
0.1uF
50V
6 8 3 1 5
10 14
OUTA MODE
7
PHASE
GND
15 8
OUTB ENABLE
1
IC608
CL611
BRAKE
A3952SB
11
R603
SENSE
1
R601
1
3 2
RC REF
R600
1
C636
0.001uF
50V
R607
100k
+24GND
PLATEN_MOTOR_BLOCK
IC603
SN74LV74ANSR
+5V
IC602
R621
4.7k
Q606
2SB798-T1-DLDK
R623
1k
R620
+5V
820
C613
R613
0.0022uF 1
REF
R617
TP605 390
Q607
R614
2.2k
2SC1623-T1-L5L6
+24GND
R619
CL615
82
R622
1k
R615
2.2k
R618
82
+5V
C614
R616
GND GND
0.0022uF 1
+24GND
R624 R625 R626
R627
4.7k 4.7k
4.7k
4.7k
+5V
C639
100uF R637
25V 10k
C638
R636
0.1uF 10k
R609
0
GND
14
NM
3 VCC 1
TP625
1Y 1A
2
1B
6 4
TP626
2Y 2A
5
2B
8 9
TP627
3Y 3A
R610
10
0
3B
11 12
4Y 4A
13
4B
GND R639
10k
7
C610
IC613
C607
100uF
0.1uF SN74LV32ANSR
25V
GND
IC604 +5V
SN74LV161ANSR
16
14
VCC 9
(3/7) C616
IC605
QA LD
0.1uF
SN74LV04ANSR 13
3
QB A
12
4
+5V
QC B
11
5
QD C
6
D
14
VCC GND
4 2
1SD CLK
5 2
1Q 1D
3 7
1CP ENP
6 1 15 10
1Q 1CD RCO ENT
10 6 5 1
2SD CLR
9 12 GND
2Q 2D
11 8
2CP
8 13
GND
2Q 2CD
GND C615
0.1uF
7
GND
PLT_A
TP606
IC601 (3/9)
CL616
SN74LV541ANSR
16 4 IC601 (4/9)
CL617
SN74LV541ANSR
15 5
CL618 TP607
IC601 (5/9)
SN74LV541ANSR
14 6
CL619
13
7
IC601 (6/9)
PLT_B
SN74LV541ANSR
PRT-13
CN610 CN601
IC5
2P 29P
93P
94P
3P 28P
IC9
4P 27P
8P
PRT-13
PWUP
TP608
CN610 CN601
IC5
CL624
11P 20P
12P 19P
PWDWN
13P 18P
TP609
14P 17P
CL625
PLT_A
TP610
TP611
15P 16P
16P 15P
PLT_B
2P
3P
4P
5P
6P
7P
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