AR-SP3 (serv.man2). ARSP3-Service Manual - Sharp Copying Equipment Service Manual (repair manual). Page 20

The GDI/USB PWB has two circuits; one for transmitting and receiving
IEEE1284 signals and the other for transmitting and receiving USB sig-
nals and converting USB signals into IEEE1284 signals.

IC601, 602 and 603 are connected between IEEE1284 an ASIC to con-
vert signals.

IC501 transmits and receives USB signals and converts USB signals
into IEEE1284 signals.

IC502 stores various setup data necessary for USB operation of IC501.

IC503 informs the CPU of connection of USB. It is connected with PC
via a USB cable. When 5V is inputted from PC to the IC’s input pin,
the output pin (signal name: USB-IN) is driven to HIGH to inform the
CPU of connection of USB.

IC504 detects connection with PC via a USB cable, supplies power to
the USB port signal line (signal name: DATA+) to enable USB com-
munication.

When USB is connected, the CPU enables USB and disables
IEEE1284.

(When USB is enabled, IE1284 is disabled.)

This printer uses a bi-directional parallel interface. Use the supplied in-
terface cable.

Connector
36-pin DDK 57LE-40360-730B (D29) female connector or equivalent
connector

Cable
Shielded type bi-directional parallel interface
For best results,, use a printer interface cable which is IEEE1284 com-
pliant.

Pin configuration
The pin numbers and signal names are listed in the following table.

Pin

No.

Signal name

Pin

No.

Signal name

1

STB

19

GND (STB RET)

2

DATA1

20

GND (DATA1 RET)

3

DATA2

21

GND (DATA2 RET)

4

DATA3

22

GND (DATA3 RET)

5

DATA4

23

GND (DATA4 RET)

6

DATA5

24

GND (DATA5 RET)

7

DATA6

25

GND (DATA6 RET)

8

DATA7

26

GND (DATA7 RET)

9

DATA8

27

GND (DATA8 RET)

10

ACKNLG

28

GND
(ACKNLG RET)

11

BUSY

29

GND (BUSY RET)

12

PE (Paper End)

30

GND (PE RET)

13

SLTC

31

INPRM

14

AUTO LF

32

FAULT

15

(NC)

33

(NC)

16

GND (0 V)

34

(NC)

17

FG

35

+5 V

18

+5 V

36

SLTC IN

IC10

IC601

PDATA0

7

PDATA0

7

/1284_EN

REV

/STB,/AUTOFD,

IC602

/SLCTIN,/INIT

/STB,/AUTOFD,/SLCTIN,/INIT

IEEE1284

/USB_EN

/ACK,BUSY,PE,

IC603

/FAULT,SLCT

/ACK,BUSY,PE,/FAULT,SLCT

IC504

IC113 74HC14

IC501

DATA+

DATA +

5V

USB

DATA -

RESET/DISABL

E

GND

IC9

IC503

USB-IN

5V

IC502

ASIC

CPU

74LS

245

74LS

244A

74LS

244B

74LS

244

USS-725

EEPR

OM

7SH08F

7SH08F

MCU PWB

GDI/USB PWB

Personal

Computer

Personal

Computer

1

18

36

19

AR-SP3

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