Electrical Section - Sharp AR-SP3 (SPF) Service Manual

AR-SP3
[5] AR-PG1

1. Electrical section

A. GDI/USB PWB
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.)
2. Interface
A. PARALLEL INTERFACE
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.
18
36
Pin
Signal name
No.
1 STB
2 DATA1
3 DATA2
4 DATA3
5 DATA4
6 DATA5
7 DATA6
8 DATA7
9 DATA8
10 ACKNLG
11 BUSY
12 PE (Paper End)
13 SLTC
14 AUTO LF
15 (NC)
16 GND (0 V)
17 FG
18 +5 V
5 – 1
1
19
Pin
Signal name
No.
19 GND (STB RET)
20 GND (DATA1 RET)
21 GND (DATA2 RET)
22 GND (DATA3 RET)
23 GND (DATA4 RET)
24 GND (DATA5 RET)
25 GND (DATA6 RET)
26 GND (DATA7 RET)
27 GND (DATA8 RET)
GND
28
(ACKNLG RET)
29 GND (BUSY RET)
30 GND (PE RET)
31 INPRM
32 FAULT
33 (NC)
34 (NC)
35 +5 V
36 SLTC IN