AL-840 (serv.man10). AL800 840 Service Manual-Signal List - Sharp Copying Equipment Service Manual (repair manual). Page 6

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Signal
name
Device
Pin
No.
Input/
Output
Content
Remark
SDATA
ASIC
(ICU)
13
IN/OUT Serial data bus.
Bi-directional
SDATA-
CPU
94
IN/OUT Video I/F serial
communication data
SDCLK
ASIC
187
OUT
Effective image area signal
NC
Select1
ASIC
(ICU)
99
OUT
Used as the status and
request data signal line from
the printer.
Select2
ASIC
(ICU)
75
OUT
Used as the status and
request data signal line from
the printer.
Select3
ASIC
(ICU)
49
OUT
Used as the status and
request data signal line from
the printer.
SELIN1
ASIC
196
OUT
Input select 1
SELIN2
ASIC
195
OUT
Input select 2
SELIN3
ASIC
194
OUT
Input select 3
SERIAL
ASIC
(ICU)
139
IN
SFCLK
ASIC
189
IN
CCD drive clock (48MHz),
also used as internal clock
SH
ASIC
171
OUT
CCD drive signal shift pulse
SLCT
ASIC
122
OUT
(NC)
SLCTIN
ASIC
114
IN
(NC)
SOE1
ASIC
138
OUT
Read enable line to SRAM
before area separation
SP
ASIC
174
OUT
CCD drive signal sampling
hold pulse
SPFS
CPU
102
IN
Sensor for SPF
NC
SPMT_0
CPU
79
OUT
SPF motor drive signal 1
NC
SPMT_1
CPU
78
OUT
SPF motor drive signal 2
NC
SPMT_2
CPU
77
OUT
SPF motor drive signal 3
NC
SPMT_3
CPU
76
OUT
SPF motor drive signal 4
NC
STB
ASIC
116
IN
(NC)
STBY
CPU
83
IN
Pull up
SWE0
ASIC
142
OUT
Write enable line to SRAM
before area separation
SWE1
ASIC
139
OUT
Write enable line to SRAM
before area separation
SWOFF
CPU
126
OUT
Power SW OFF
NC
SYNC
ASIC
191
IN
Horizontal sync signal from
LSU (HSYNC)
SYNC_
ASIC
(ICU)
16
IN
Sync. Makes timing for
starting printing of each line.
SYNCEN
ASIC
127
OUT
Jitter adjustment IC trigger
signal
TC/BIASON
ASIC
219
OUT
Transfer charger,
developing bias ON
TESPIN1
ASIC
126
IN
High: Normal, Low: Test
TEST port 0
ASIC
190
IN
HIGH: Normal, LOW: Test
(NC)
TEST port 1
ASIC
255
IN
HIGH: Normal, LOW: Test
TESTPIN0
ASIC
123
IN
High: Normal, LOW: Test
TM
ASIC
229
OUT
Toner motor drive output (+)
NC
TM_
ASIC
230
OUT
Toner motor drive output (-)
NC
TMCLK
ASIC
4
IN
Tonr motor reference clock
NC
TMON
ASIC
3
IN
Toner motor ON/OFF
NC
TS
CPU
64
OUT
Toner sensor
TSTENB
ASIC
(ICU)
143
IN
Test signal. At HIGH, enters
the test mode. Usually LOW.
VCC
ASIC
(ICU)
1
+5V
VCC
ASIC
(ICU)
19
+5V
VCC
ASIC
(ICU)
37
+5V
VCC
ASIC
(ICU)
51
+5V
VCC
ASIC
(ICU)
58
+5V
Signal
name
Device
Pin
No.
Input/
Output
Content
Remark
VCC
ASIC
(ICU)
73
+5V
VCC
ASIC
(ICU)
82
+5V
VCC
ASIC
(ICU)
90
+5V
VCC
ASIC
(ICU)
103
+5V
VCC
ASIC
(ICU)
109
+5V
VCC
ASIC
(ICU)
113
+5V
VCC
ASIC
(ICU)
126
+5V
VCC
ASIC
(ICU)
133
+5V
VFM-
ASIC
208
OUT
FAN drive signal
NC
VFM_CNT
ASIC
222
OUT
FAN control signal
VSYNC
ASIC
(ICU)
2
IN
Vertical sync. Informs the
start position of one page at
the rising edge.
VSYNC-
ASIC
202
OUT
Paper lead edge sync signal
WDTOVF-
CPU
80
OUT
Watch dog timer
WE
ASIC
64
OUT
DRAM (page memory) write
enable signal
XBUSY3
ASIC
(ICU)
53
OUT
Busy signal/Command data
identification signal/Used to
control data transmission.
XTAL
CPU
85
Clock  
ZC
CPU
37
IN
Zero cross signal;
NC
ASIC
224
OUT
NC
ASIC
225
OUT
CPU
3
D-GND
CPU
4
D-GND
CPU
5
5V
CPU
10
OUT
D-GND
CPU
19
OUT
D-GND
CPU
28
D-GND
CPU
35
D-GND
CPU
36
D-GND
CPU
39
5V
CPU
44
D-GND
CPU
53
D-GND
CPU
58
5V
CPU
65
D-GND
CPU
67
D-GND
CPU
68
D-GND
CPU
84
5V
CPU
87
D-GND
CPU
89
5V
CPU
99
D-GND
CPU
100
D-GND
CPU
103
A5V
CPU
104
Analog reference voltage
CPU
113
AN-GND
CPU
114
D-GND
CPU
123
IN
GND
CPU
124
IN
GND
CPU
125
IN
Vcc
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