Read Sharp AL-840 (serv.man10) Service Manual online
Signal
name
Device
Pin
No.
No.
Input/
Output
Content
Remark
RAMA0
ASIC
(ICU)
(ICU)
34
OUT
DRAM address bus
RAMA1
ASIC
(ICU)
(ICU)
33
OUT
DRAM address bus
RAMA2
ASIC
(ICU)
(ICU)
32
OUT
DRAM address bus
RAMA3
ASIC
(ICU)
(ICU)
31
OUT
DRAM addrress bus
RAMA4
ASIC
(ICU)
(ICU)
30
OUT
DRAM address bus
RAMA5
ASIC
(ICU)
(ICU)
29
OUT
DRAM address bus
RAMA6
ASIC
(ICU)
(ICU)
28
OUT
DRAM address bus
RAMA7
ASIC
(ICU)
(ICU)
26
OUT
DRAM address bus
RAMA8
ASIC
(ICU)
(ICU)
25
OUT
DRAM address bus
RAMA9
ASIC
(ICU)
(ICU)
35
OUT
DRAM address bus
RAMD1
ASIC
(ICU)
(ICU)
43
IN/OUT DRAM data bus
RAMD2
ASIC
(ICU)
(ICU)
42
IN/OUT DRAM data bus
RAMD3
ASIC
(ICU)
(ICU)
41
IN/OUT DRAM data bus
RAMD4
ASIC
(ICU)
(ICU)
40
IN/OUT DRAM data bus
RAMD5
ASIC
(ICU)
(ICU)
23
IN/OUT DRAM data bus
RAMD6
ASIC
(ICU)
(ICU)
22
IN/OUT DRAM data bus
RAMD7
ASIC
(ICU)
(ICU)
21
IN/OUT DRAM data bus
RAMD8
ASIC
(ICU)
(ICU)
20
IN/OUT DRAM data bus
RAMWR_
ASIC
(ICU)
(ICU)
39
OUT
Write signal
RAS_
ASIC
(ICU)
(ICU)
38
OUT
Low address select
RAS0
ASIC
40
OUT
DRAM (page memory) RAS
signal 0
signal 0
RAS1
ASIC
41
OUT
DRAM (page memory) RAS
signal 1
signal 1
RAS16
ASIC
45
OUT
(NC)
RAS2
ASIC
42
OUT
DRAM (page memory) RAS
signal 2
signal 2
RAS64
ASIC
43
OUT
(NC)
RD
CPU
91
OUT
Read signal
RES-
CPU
81
IN
Reset
RESERR
CPU
109
IN
Engine error cancel request
from ICU
from ICU
RESERR_
ASIC
(ICU)
(ICU)
9
OUT
Reset error. Driven to LOW
when requesting the engine
for error cancel.
when requesting the engine
for error cancel.
RESET
ASIC
17
IN
Reset signal
RESET_
ASIC
(ICU)
(ICU)
4
IN
System reset
RESET-ICU
ASIC
206
OUT
ICU RESET signal
REV
ASIC
112
OUT
(NC)
ROMTEST
ASIC
(ICU)
(ICU)
136
–
Test signal. At HIGH, enters
the test mode. Usually LOW.
the test mode. Usually LOW.
RS
ASIC
173
OUT
CCD drive signal reset pulse
RTH
CPU
105
AIN
Fusing thermistor
SAD0
ASIC
154
OUT
Address line to SRAM
before area separation
before area separation
SAD1
ASIC
155
OUT
Address line to SRAM
before area separation
before area separation
SAD10
ASIC
165
OUT
Address line to SRAM
before area separation
before area separation
Signal
name
Device
Pin
No.
No.
Input/
Output
Content
Remark
SAD11
ASIC
166
OUT
Address line to SRAM
before area separation
before area separation
SAD12
ASIC
167
OUT
Address line to SRAM
before area separation
before area separation
SAD13
ASIC
168
OUT
Address line to SRAM
before area separation
before area separation
SAD2
ASIC
156
OUT
Address line to SRAM
before area separation
before area separation
SAD3
ASIC
157
OUT
Address line to SRAM
before area separation
before area separation
SAD4
ASIC
158
OUT
Address line to SRAM
before area separation
before area separation
SAD5
ASIC
159
OUT
Address line to SRAM
before area separation
before area separation
SAD6
ASIC
160
OUT
Address line to SRAM
before area separation
before area separation
SAD7
ASIC
161
OUT
Address line to SRAM
before area separation
before area separation
SAD8
ASIC
163
OUT
Address line to SRAM
before area separation
before area separation
SAD9
ASIC
164
OUT
Address line to SRAM
before area separation
before area separation
SAMP
ASIC
214
OUT
APC circuit sampling signal
(laser power sampling)
(laser power sampling)
SCANSP
ASIC
1
IN
Scanner process interrupt
signal
signal
SCANSP-
ASIC
211
OUT
Scan stop signal
SCANST
ASIC
256
IN
Scanner process start signal
SCANST-
ASIC
212
OUT
Scan start signal
SCLK-
ASIC
201
OUT
VIDEO I/F serial
communication sync clock
communication sync clock
SCLK_
ASIC
(ICU)
(ICU)
12
IN
Serial transfer clock
SCS0
ASIC
143
OUT
Chip select line to SRAM
before area separation
before area separation
SCS1
ASIC
140
OUT
Chip select line to SRAM
before area separation
before area separation
SD00
ASIC
144
IN/OUT Data line to SRAM before
area separation
SD01
ASIC
145
IN/OUT Data line to SRAM before
area separation
SD02
ASIC
147
IN/OUT Data line to SRAM before
area separation
SD03
ASIC
148
IN/OUT Data line to SRAM before
area separation
SD04
ASIC
150
IN/OUT Data line to SRAM before
area separation
SD05
ASIC
151
IN/OUT Data line to SRAM before
area separation
SD06
ASIC
152
IN/OUT Data line to SRAM before
area separation
SD07
ASIC
153
IN/OUT Data line to SRAM before
area separation
SD10
ASIC
128
IN/OUT Data line to SRAM before
area separation
SD11
ASIC
129
IN/OUT Data line to SRAM before
area separation
SD12
ASIC
130
IN/OUT Data line to SRAM before
area separation
SD13
ASIC
131
IN/OUT Data line to SRAM before
area separation
SD14
ASIC
132
IN/OUT Data line to SRAM before
area separation
SD15
ASIC
134
IN/OUT Data line to SRAM before
area separation
SD16
ASIC
135
IN/OUT Data line to SRAM before
area separation
SD17
ASIC
137
IN/OUT Data line to SRAM before
area separation
SDA
ASIC
(ICU)
(ICU)
140
IN/OUT
11 – 5
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