AR-M165-207 (serv.man17). Service Manual - Sharp Copying Equipment Service Manual (repair manual). Page 123

AR-M207 M165 M162 ELECTRICAL SECTION 13-6

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.

The IEEE1284 driver is used to perform interface between the ASIC

(engine) and the host.

USB driver
IC401

USB  

connector

 

D -

D+

OE, RCV, VP, VM
Suspend, VMO
VPO

 

 

 

ASIC

Centronics 

connector 

IEEE1284  

driver  

 

IC403  

ASIC

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

The I/F circuit is composed of the USB driver and the IEEE1284 driver, and performs hard interface with the ASIC (MCU PWB).

MM_PH_A

OUT_A-

MM_AI0

MM_PH_B

MM_BI0
MM_BI1

MM_AI1

OUT_A+

OUT_B-

MMref0
MMref1
MMref2

OUT_B+

5V

24VM

5V

PGND

PGND

PGND

PGND

PGND

PGND

PGND

PGND

5V

R121
1.5kJ

R119

0.68J/1W

C147
820p

T445

1

R124
30kJ

R122
1.5kJ

C153
0.1u

R120

0.68J/1W

C149
820p

R123
1kF

T437

1

R125
30kJ

C148
820p

T443

1

C150
820p

R128
910F

T442

1

R127
3kF

+

C151
10u/16V

C152
0.1u

R126
13kF

IC32

L6219DS013TR

2
3
4
5
6
7
8
9

10
11
12

13

14

15

16

17

18

19

20

21

22

23

24

1

OUT 2A
SENSE 2
COMP 2
OUT 2B
GND
GND
I02
I12
PHASE 2
VREF 2
RC 2

VSS

RC 1

VREF 1

PHASE 1

I11

GND

GND

I01

OUT 1B

COMP 1

SENSE 1

VS

OUT 1A

T446

1

T444

1

24V

24VM

PGND

24Vdup

C143
0.1u

CP2

*0603FA1.5A

+

C142
47u/35V

C144
0.1u

CP1
0603FA1.5A

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