Read Sharp AR-161 (serv.man15) Service Manual online
Pin No.
Pin name
Signal name
I/O
Function
Purpose
Descriptions
124
MD1
—
IN
Operation mode setting pin 1
Operation mode setting
(MODE 4)
(MODE 4)
Operation mode 4
125
MD2
—
IN
Operation mode setting pin 2
Operation mode setting
(MODE 4)
(MODE 4)
Operation mode 4
126
PG0
RY/BY
IN
General port G0
Flash ROM busy signal
0: Busy state
127
/CS3
/CS3
OUT
Area 3 chip select
I/O extension ASIC chip select L: Select effective
128
/CS2
/CS2
OUT
Area 2 chip select
Image ASIC chip select
L: Select effective
(Pin descriptions) IN: Input pin OUT: Output pin BIDIR: Bi-directional pin ODN: Open drain output pin TR1: 3-state output pin POW: Power pin
(3) Image ASIC (HG73C039FD)
a. Outline
Fig. 4 shows the block diagram of the ASIC.
The ASIC is composed of the following three blocks; the image process section, the print control section, and the I/F section.
The image process section processes the image data from the CCD PWB according to the operation mode, such as shading, AE process,
resolution conversion. and zooming.
The print control section outputs the image-processed data during copying to the LSU (Laser unit) in synchronization with writing timing of the LSU.
The I/F section controls communication of interface (IEEE1284) with the host PC and controls DRAM of send/receive data buffer with the host PC.
(Only for models with the printer function)
The ASIC is controlled by the CPU which writes the operation mode and the set values necessary for each operation mode to the ASIC control
register.
The ASIC is composed of the following three blocks; the image process section, the print control section, and the I/F section.
The image process section processes the image data from the CCD PWB according to the operation mode, such as shading, AE process,
resolution conversion. and zooming.
The print control section outputs the image-processed data during copying to the LSU (Laser unit) in synchronization with writing timing of the LSU.
The I/F section controls communication of interface (IEEE1284) with the host PC and controls DRAM of send/receive data buffer with the host PC.
(Only for models with the printer function)
The ASIC is controlled by the CPU which writes the operation mode and the set values necessary for each operation mode to the ASIC control
register.
b. pin/signal table
PIN
No.
Signal name
IN/OUT
Description
1
/SCANSP
IN
Scanner process interrupt signal
2
/PRSTART
IN
Print start trigger signal
3
TMON
IN
Toner motor ON/OFF
4
TMCLK
IN
Toner motor reference clock
5
3.3V
Power
6
CPUAD7
IN
CPU address bus
7
CPUAD6
IN
8
GND
Power
9
CPUAD5
IN
CPU address bus
10
CPUAD4
IN
11
CPUAD3
IN
12
CPUAD2
IN
13
CPUAD1
IN
PIN
No.
Signal name
IN/OUT
Description
14
/CPUSYNC
OUT
Horizontal synchronization signal
15
/INTR
OUT
Interruption request signal
16
/CPUCS
IN
CPU chip select signal
17
/RESET
IN
Reset signal
18
5V
Power
19
GND
Power
20
3.3V
Power
21
GND
Power
22
MDATA15
IN/OUT
Data bus of DRAM (page memory)
23
MDATA14
IN/OUT
24
MDATA13
IN/OUT
25
MDATA12
IN/OUT
26
MDATA11
IN/OUT
AR-161
AR-160/161 FM/E [13] ELECTRICAL SECTION 12/1/1998
13 – 5
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