Mirror Motor Control Circuit, Duplex Motor Control Circuit; Mirror Motor Drive Circuit; I/F Circuit; Usb Circuit - Sharp AR-M207 Service Manual

(9) Mirror motor control circuit, Duplex motor control circuit

Stepping motors are employed for the mirror motor and the duplex motor. The driver for IC32 (for mirror motor) is the bipolar drive L6219DS.
For control, the ASIC outputs the drive signal to the IC. They drive each motor in 1-2 phase excitement or 2-phase excitement.
Each motor switches the motor current value in each magnification ratio.

Mirror motor drive circuit

OUT_A-
OUT_A+
OUT_B+
OUT_B-
R126
13kF
MMref0
MMref1
MMref2

(10)I/F circuit

a. General
The I/F circuit is composed of the USB driver and the IEEE1284 driver, and performs hard interface with the ASIC (MCU PWB).
b. USB circuit
With the USB driver, the differential signals (analog) of USB are
converted into digital signal, which are sent to the ASIC. In the reverse
procedure, interface between the ASIC (engine) and the host is
performed.
USB driver
IC401
ASIC
OE, RCV, VP, VM
Suspend, VMO
VPO
R120
0.68J/1W
R122
1.5kJ
T443
C148
PGND 820p
MM_BI0
T444
MM_BI1
5V
T446
MM_PH_B
R123
1kF
C149 R124
820p 30kJ
R127 R128
3kF 910F
PGND
C152 C153
0.1u 0.1u
PGND
D+
D -
AR-M207 M165 M162 ELECTRICAL SECTION 13-6
CP1
0603FA1.5A
24VM
24VM
5V
T437
IC32
1 24
OUT 1A VS
2 23
OUT 2A SENSE 1
3 22
SENSE 2 COMP 1
4 21
COMP 2 OUT 1B
5 20
OUT 2B I01
6 19
GND GND
7 18
GND GND
8 17
I02 I11
T445
9 16
I12 PHASE 1
10 15
PHASE 2 VREF 1
11 14
VREF 2 RC 1
12 13
RC 2 VSS
L6219DS013TR
R125
30kJ
PGND PGND
5V
C151
+
10u/16V
PGND
c. IEEE1284 circuit
The IEEE1284 driver is used to perform interface between the ASIC
(engine) and the host.
ASIC
USB
connector
24V
CP2
*0603FA1.5A
C143 C144 C142
+
47u/35V
0.1u 0.1u
R119
0.68J/1W
R121
1.5kJ
T442
C147
MM_AI0
820p
MM_AI1
MM_PH_A
C150
820p
PGND
IEEE1284
driver
IC403
24Vdup
PGND
PGND
Centronics
connector