Read Sharp AL-840 (serv.man10) Service Manual online
Signal
name
Device
Pin
No.
No.
Input/
Output
Content
Remark
D8
CPU
49
IN/OUT Data bus
D9
CPU
50
IN/OUT Data bus
DAH
CPU
111
IN
CCD reference voltage
(High)
(High)
DAL
CPU
112
IN
CCD reference voltage
(LOW)
(LOW)
Data11
ASIC
(ICU)
(ICU)
116
IN/OUT Data bus.
Data12
ASIC
(ICU)
(ICU)
115
IN/OUT Data bus.
Data13
ASIC
(ICU)
(ICU)
114
IN/OUT Data bus.
Data14
ASIC
(ICU)
(ICU)
111
IN/OUT Data bus.
Data15
ASIC
(ICU)
(ICU)
110
IN/OUT Data bus.
Data16
ASIC
(ICU)
(ICU)
107
IN/OUT Data bus.
Data17
ASIC
(ICU)
(ICU)
106
IN/OUT Data bus.
Data18
ASIC
(ICU)
(ICU)
105
IN/OUT Data bus.
Data21
ASIC
(ICU)
(ICU)
92
IN/OUT Data bus.
Data22
ASIC
(ICU)
(ICU)
89
IN/OUT Data bus.
Data23
ASIC
(ICU)
(ICU)
88
IN/OUT Data bus.
Data24
ASIC
(ICU)
(ICU)
86
IN/OUT Data bus.
Data25
ASIC
(ICU)
(ICU)
85
IN/OUT Data bus.
Data26
ASIC
(ICU)
(ICU)
84
IN/OUT Data bus.
Data27
ASIC
(ICU)
(ICU)
81
IN/OUT Data bus.
Data28
ASIC
(ICU)
(ICU)
80
IN/OUT Data bus.
Data31
ASIC
(ICU)
(ICU)
66
IN/OUT Data bus.
Data32
ASIC
(ICU)
(ICU)
65
IN/OUT Data bus.
Data33
ASIC
(ICU)
(ICU)
64
IN/OUT Data bus.
Data34
ASIC
(ICU)
(ICU)
62
IN/OUT Data bus.
Data35
ASIC
(ICU)
(ICU)
61
IN/OUT Data bus.
Data36
ASIC
(ICU)
(ICU)
60
IN/OUT Data bus.
Data37
ASIC
(ICU)
(ICU)
57
IN/OUT Data bus.
Data38
ASIC
(ICU)
(ICU)
56
IN/OUT Data bus.
DCRDY-
ASIC
203
OUT
Serial communication
request
request
DCRDY_
ASIC
(ICU)
(ICU)
6
IN
Command ready. Sends a
command to the PCU at
LOW.
command to the PCU at
LOW.
DDATA
ASIC
(ICU)
(ICU)
17
OUT
Video data
DOP-
CPU
108
IN
Door open sensor
DPAGE-
CPU
110
IN
Print request signal from ICU
DPAGE_
ASIC
(ICU)
(ICU)
11
OUT
Page. Driven to LOW when
requesting the engine for
printing.
requesting the engine for
printing.
DPRIM-
CPU
33
IN
Communication port
initialize signal from ICU
initialize signal from ICU
DPRIM_
ASIC
(ICU)
(ICU)
14
OUT
DREADY-
ASIC
204
OUT
Engine ready
Signal
name
Device
Pin
No.
No.
Input/
Output
Content
Remark
DREADY_
ASIC
(ICU)
(ICU)
5
IN
Engine ready. Shows the
print enable state at LOW.
Turns HIGH during printing
or in case of an print error.
print enable state at LOW.
Turns HIGH during printing
or in case of an print error.
DSRDY-
CPU
101
IN
Serial communication
request from controller
request from controller
DSRDY_
ASIC
(ICU)
(ICU)
8
OUT
Status ready. At LOW, the
PCU can send a status
signal.
PCU can send a status
signal.
EEPCK
CPU
95
OUT
Serial clock output
EEPD
CPU
96
OUT
Serial data I/O
ERROR
ASIC
205
OUT
Engine error to ICU
ERROR
ASIC
(ICU)
(ICU)
7
IN
Error. Turns HIGH in case
of an engine error.
of an engine error.
ESACK
ASIC
100
IN
(NC)
ESCS
ASIC
101
IN
(NC)
ESPRD
ASIC
97
IN
(NC)
ESREQ
ASIC
99
OUT
(NC)
EXTAL
CPU
86
Clock
F_RXD
CPU
62
IN
FAX&PRINTER recpetion
buffer
buffer
NC
F_TXD
CPU
60
OUT
FAX&PRINTER send enable NC
f1
ASIC
169
OUT
CCD drive signal transfer
clock (First phase)
clock (First phase)
f2
ASIC
170
OUT
CCD drive signal transfer
clock (Second phase)
clock (Second phase)
FAULT
ASIC
120
OUT
(NC)
FAXACK
ASIC
94
IN
(NC)
FAXCS
ASIC
96
IN
(NC)
FAXPRD
ASIC
92
IN
(NC)
FAXREQ
ASIC
93
OUT
(NC)
FIRQ-
CPU
31
IN
FAXPRINTER
NC
FORATFD
ASIC
(ICU)
(ICU)
130
IN
Fixed. (HIGH)
FORID1
ASIC
(ICU)
(ICU)
123
IN
ID ROM select (machine ID
No.)
No.)
FORID2
ASIC
(ICU)
(ICU)
124
IN
ID ROM select (machine ID
No.)
No.)
FORTEST
ASIC
(ICU)
(ICU)
121
IN
FORTEST
ASIC
(ICU)
(ICU)
122
IN
GND
ASIC
8
Power
GND
ASIC
19
Power
GND
ASIC
21
Power
GND
ASIC
34
Power
GND
ASIC
47
Power
GND
ASIC
60
Power
GND
ASIC
72
Power
GND
ASIC
89
Power
GND
ASIC
91
Power
GND
ASIC
98
Power
GND
ASIC
111
Power
GND
ASIC
124
Power
GND
ASIC
136
Power
GND
ASIC
149
Power
GND
ASIC
162
Power
GND
ASIC
175
Power
GND
ASIC
188
Power
GND
ASIC
239
Power
GND
ASIC
252
Power
GND
ASIC
254
Power
GND
ASIC
(ICU)
(ICU)
10
–
GND
GND
ASIC
(ICU)
(ICU)
18
–
GND
GND
ASIC
(ICU)
(ICU)
27
–
GND
11 – 2
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