AL-840 (serv.man10). AL800 840 Service Manual-Signal List - Sharp Copying Equipment Service Manual (repair manual). Page 3

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Signal
name
Device
Pin
No.
Input/
Output
Content
Remark
GND
ASIC
(ICU)
36
GND
GND
ASIC
(ICU)
44
GND
GND
ASIC
(ICU)
50
GND
GND
ASIC
(ICU)
54
GND
GND
ASIC
(ICU)
59
GND
GND
ASIC
(ICU)
63
GND
GND
ASIC
(ICU)
67
GND
GND
ASIC
(ICU)
72
GND
GND
ASIC
(ICU)
78
GND
GND
ASIC
(ICU)
83
GND
GND
ASIC
(ICU)
87
GND
GND
ASIC
(ICU)
91
GND
GND
ASIC
(ICU)
96
GND
GND
ASIC
(ICU)
102
GND
GND
ASIC
(ICU)
108
GND
GND
ASIC
(ICU)
112
GND
GND
ASIC
(ICU)
117
GND
GND
ASIC
(ICU)
127
GND
GND
ASIC
(ICU)
131
GND
GND
ASIC
(ICU)
135
IN
GND
GND
ASIC
(ICU)
138
GND
GND
ASIC
(ICU)
144
GND
HLON
CPU
72
OUT
Heater lamp control 
HSYNC
ASIC
83
OUT
(NC)
HWR
CPU
92
OUT
Write signal (High address)
I/O
ASIC
(ICU)
119
OUT
IDIN0
ASIC
178
IN
Image scan data (after 8 bit
A/D conversion)
IDIN1
ASIC
179
IN
Image scan data (after 8 bit
A/D conversion)
IDIN2
ASIC
180
IN
Image readign data (10 bit
A/D conversion)
IDIN3
ASIC
181
IN
Image scan data (after 11
bit A/D conversion)
IDIN4
ASIC
182
IN
Image scan data (after 12
bit A/D conversion)
IDIN5
ASIC
183
IN
Image scan data (after 13
bit A/D conversion)
IDIN6
ASIC
184
IN
Image scan data (after 14
bit A/D conversion)
IDIN7
ASIC
186
IN
Image reading data (16 bit
A/D conversion)
IETON_
ASIC
(ICU)
137
IN
IET circuit operation switch
INIT
ASIC
113
IN
(NC)
INTR
ASIC
15
OUT
Interrupt request signal
NC
INTROM
ASIC
(ICU)
142
IN
Signal
name
Device
Pin
No.
Input/
Output
Content
Remark
LD
ASIC
192
OUT
Laser drive signal
LDATAEN
ASIC
198
OUT
Laser enable (ON/OFF)
signal
LEND
ASIC
193
OUT
Laser APC signal
LEND-
ASIC
216
OUT
Line end signal
LEND_
ASIC
(ICU)
15
IN
Line end. When HIGH is
inputted, VDD is driven to
HIGH.
LWR
CPU
93
OUT
Write signal (Low address)
MAD0
ASIC
46
OUT
DRAM (page memory)
address bus
MAD1
ASIC
48
OUT
DRAM (page memory)
address bus
MAD10
ASIC
58
OUT
DRAM (page memory)
address bus
MAD11
ASIC
59
OUT
DRAM (page memory)
address bus
MAD2
ASIC
49
OUT
DRAM (page memory)
address bus
MAD3
ASIC
50
OUT
DRAM (page memory)
address bus
MAD4
ASIC
51
OUT
DRAM (page memory)
address bus
MAD5
ASIC
52
OUT
DRAM (page memory)
address bus
MAD6
ASIC
53
OUT
DRAM (page memory)
address bus
MAD7
ASIC
54
OUT
DRAM (page memory)
address bus
MAD8
ASIC
55
OUT
DRAM (page memory)
address bus
MAD9
ASIC
56
OUT
DRAM (page memory)
address bus
MASK_PEL
ASIC
(ICU)
125
IN
Parity_error of the status
register bit 11 is masked.
MCON
ASIC
218
OUT
Main charger ON
MDATA0
ASIC
39
IN/OUT DRAM (page memory) data
bus
MDATA1
ASIC
38
IN/OUT DRAM (page memory) data
bus
MDATA10
ASIC
27
IN/OUT DRAM (page memory) data
bus
MDATA11
ASIC
26
IN/OUT DRAM (page memory) data
bus
MDATA12
ASIC
25
IN/OUT DRAM (page memory) data
bus
MDATA13
ASIC
24
IN/OUT DRAM (page memory) data
bus
MDATA14
ASIC
23
IN/OUT DRAM (page memory) data
bus
MDATA15
ASIC
22
IN/OUT DRAM (page memory) data
bus
MDATA2
ASIC
37
IN/OUT DRAM (page memory) data
bus
MDATA3
ASIC
36
IN/OUT DRAM (page memory) data
bus
MDATA4
ASIC
35
IN/OUT DRAM (page memory) data
bus
MDATA5
ASIC
33
IN/OUT DRAM (page memory) data
bus
MDATA6
ASIC
32
IN/OUT DRAM (page memory) data
bus
MDATA7
ASIC
30
IN/OUT DRAM (page memory) data
bus
MDATA8
ASIC
29
IN/OUT DRAM (page memory) data
bus
MDATA9
ASIC
28
IN/OUT DRAM (page memory) data
bus
MEM0
ASIC
(ICU)
128
IN
Used to set the DRAM size.
11 – 3
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