Sharp AL-1215 Service Manual page 104

(8) Mirror motor control circuit, Duplex motor control circuit
Stepping motors are employed for the mirror motor, the SPF motor,
and the duplex motor. The driver for IC127 (for mirror motor) is the
bipolar drive L6219DS, and the driver for IC128 (for SPF) is the uni-
polar drive IC MTD1361F. For control, the SPF outputs the drive signal
from the CPU to the IC, and the mirror outputs the drive signal to the IC
with the ASIC. They drive each motor in 1-2 phase excitement or 2-
phase excitement.
Each motor switches the motor current value in each magnification
ratio.
• SPF motor drive circuit
5V
C217
+
47u/16V
PGND
R199 R200 R201 R202
300J 620J 1.2kJ 100J
(5-C2) MRPS_1
(5-C2) MRPS_2
PGND
(5-C2) MRPS_3
• Mirror motor drive circuit
(8-C3) OUT_A-
(8-C3) OUT_A+
(8-C3) OUT_B+
(8-C3) OUT_B-
(5-C1) MMref0
(5-C1) MMref1
(5-C1) MMref2
C215 OPEN
R196 R197 1J
750J
R198 2.4kJ
C219
+
C220
R203 2.4kJ
0.1u 47u/16V
R206 1J
PGND
C232 OPEN
PGND
(4-D2)
(4-D2)
(4-D2)
(4-D2)
R178
0.68J
1W
C202
PGND PGND 820p
(2-A3)
(2-A3)
5V
(2-A3) MM_PH_B
R181
1kJ
C203
820p
R184 R185 R186 C205
2kJ 1kJ 510J 0.1u
PGND
AL-1551CS ELECTRICAL SECTION 12 - 10
C211 2200p
R191 7.5kJ
R194 7.5kJ
C214 2200p
PGND
R195 C216
1kJ
OPEN
2W
IC128
C218 23
CrA
20
CrB
2200p 25
VsA
3
RsA
24
VrefA
19
VrefB
12
RsB
18
VsB
C222
26
In /A
2200p 27
In A
17
In /B
16
In B
2W
R207 C227
1kJ
MTD1361/F
OPEN
(SPMT2)
(SPMT0)
(SPMT3)
(SPMT1)
IC127
R180
1.5kJ 1
OUT 1A VS
2
OUT 2A SENSE 1
3
SENSE 2 COMP 1
4
COMP 2 OUT 1B
5
OUT 2B I01
6
GND GND
7
GND GND
8
MM_BI0
I02 I11
9
MM_BI1
I12 PHASE 1
10
PHASE 2 VREF 1
11
VREF 2 RC 1
12
RC 2 VSS
L6219DS
R182
30kJ
PGND
PGND
5V
+
C207 C206
0.1u 1u/16V
PGND
24VM
24VM
22
Vmm
1
OUT /A
4
OUT A
14
OUT /B
11
OUT B
15
PG
28
PG
¢ U T
PGND
R177
24VM
5V
0.68J
R179 1W
1.5kJ
24
23
22
21
20 C201
MM_AI0 (2-A3)
19 820p PGND
18
17
MM_AI1 (2-A3)
16
MM_PH_A (2-A3)
15
14
13
R183 C204
30kJ 820p
PGND
PGND
CP201
0603FA1.5A
24V
CP101
ICP-N38
+
C209 C210
0.1u/50V 0.1u/50V
PGND
SPMT_2 (9-E1)
SPMT_0 (9-D1)
SPMT_3 (9-D1)
SPMT_1 (9-E1)
PGND
CP202
0603FA1.5A
CP102
ICP-N38
24Vdup
C208
47u/35V