Read Sharp AL-1622 (serv.man16) Service Manual online
AL-1611/AL-1622
ELECTRICAL SECTION
13 – 5
C. IMAGE ASIC (HG73C039FD)
(1) Outline
The following figure 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.
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
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.
112
DA1
DA1
OUT
Analog output 1
CCD reference
−
side
113
AVSS
POW
Analog ground pin
114
VSS
POW
Ground pin
115
TCLKD
LFTCLK
IN
Timer clock external input
Separator motor step count
Separator motor clock input
116
TIOCA2
TMCLK
OUT
Timer clock external output
Toner motor clock
960Hz clock output
117
TCLKC
SFTCLK
IN
Timer clock external input
Shifter motor step count
Shifter motor clock input
118
TIOCA1
PMCLK
OUT
Timer clock external output
Polygon motor clock
2078.74Hz clock output
119
TCLKB
SPFCLK
IN
Timer clock external input
SPF motor step count
SPF motor clock input
120
TCLKA
MIRCLK
IN
Timer clock external input
Mirror motor step count
Mirror motor clock input
121
/DACK1
OUT
DMAC channel 1 acknowl-
edge
edge
(Not used)
L: Acknowledge effective
122
/DACK0
OUT
DMAC channel 0 acknowl-
edge
edge
(Not used)
L: Acknowledge effective
123
MD0
IN
Operation mode setting pin
0
0
O p e r a t i o n m o d e s e t t i n g
(MODE 4)
(MODE 4)
Operation mode 4
124
MD1
IN
Operation mode setting pin
1
1
O p e r a t i o n m o d e s e t t i n g
(MODE 4)
(MODE 4)
Operation mode 4
125
MD2
IN
Operation mode setting pin
2
2
O p e r a t i o n m o d e s e t t i n g
(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 e x te n s i o n A S IC c h i p
select
select
L: Select effective
128
/CS2
/CS2
OUT
Area 2 chip select
Image ASIC chip select
L: Select effective
Pin No.
Pin name
Signal name
I/O
Function
Purpose
Descriptions
(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
Scan start
CCD
PWB
PWB
S
h
a
di
n
g
CCD
d
rive
AE
SRAM control
SRAM
32KB
x 2
32KB
x 2
Resolution conversion,
Zooming, lmage
process circuit
Zooming, lmage
process circuit
Print data process circuit
DRAM control
PRINT control
IEEE1284 control
DRAM
6MB or 4MB
6MB or 4MB
LSU
HSYNC
VSYNC
To CPU bus
TO PCI/F
PWB
PWB
ASIC
Image process section
I/F section
Print control section
ASIC control resistor
(Only for models
withthe printer
function)
withthe printer
function)
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