Read Sharp AL-840 (serv.man10) Service Manual online
Signal
name
Device
Pin
No.
No.
Input/
Output
Content
Remark
MEM1
ASIC
(ICU)
(ICU)
129
IN
Used to set the DRAM size.
MEN-
ASIC
227
OUT
Main motor drive signal
MHPS
CPU
38
IN
Mirror home position sensor
MMT0
CPU
118
OUT
Main motor drive signal 1
MMT1
CPU
117
OUT
Main motor drive signal 2
MODE
ASIC
(ICU)
(ICU)
120
IN
At HIGH, IET-processed
video data is outputted. At
LOW, video data is
outputted by bypassing the
IET circuit.
video data is outputted. At
LOW, video data is
outputted by bypassing the
IET circuit.
MODE
CPU
106
AIN
Power monitoring
NC
MRMT0
CPU
122
OUT
Mirror motor control signal 1
MRMT1
CPU
121
OUT
Mirror motor control signal 2
MRMT2
CPU
120
OUT
Mirror motor control signal 3
MRMT3
CPU
119
OUT
Mirror motor control signal 4
MRPS1
CPU
116
OUT
Mirror motor power save 1
MRPS2
CPU
115
OUT
Mirror motor power save 2
nAck1
ASIC
(ICU)
(ICU)
104
OUT
Acknowledge
signal/Handshake signal in
the reverse mode
signal/Handshake signal in
the reverse mode
nAck2
ASIC
(ICU)
(ICU)
79
OUT
Acknowledge
signal/Handshake signal in
the reverse mode
signal/Handshake signal in
the reverse mode
nAck3
ASIC
(ICU)
(ICU)
55
OUT
Acknowledge
signal/Handshake signal in
the reverse mode
signal/Handshake signal in
the reverse mode
nAutoFd1
ASIC
(ICU)
(ICU)
98
IN
Auto feed signal/Handshake
signal in the reverse
mode/Command data
identification signal
signal in the reverse
mode/Command data
identification signal
nAutoFd2
ASIC
(ICU)
(ICU)
74
IN
Auto feed signal/Handshake
signal in the reverse
mode/Command data
identification signal
signal in the reverse
mode/Command data
identification signal
nAutoFd3
ASIC
(ICU)
(ICU)
48
IN
Auto feed signal/Handshake
signal in the reverse
mode/Command data
identification signal
signal in the reverse
mode/Command data
identification signal
nFault1
ASIC
(ICU)
(ICU)
95
OUT
Printer’s communication
request signal to the host
request signal to the host
NC
nFault2
ASIC
(ICU)
(ICU)
70
OUT
Printer’s communication
request signal to the host
request signal to the host
NC
nFault3
ASIC
(ICU)
(ICU)
46
OUT
Printer’s communication
request signal to the host
request signal to the host
NC
nInit1
ASIC
(ICU)
(ICU)
97
IN
Data direction
(reverse/forward) signal
(reverse/forward) signal
nInit2
ASIC
(ICU)
(ICU)
71
IN
Data direction
(reverse/forward) signal
(reverse/forward) signal
nlint3
ASIC
(ICU)
(ICU)
47
IN
Data direction
(reverse/forward) signal
(reverse/forward) signal
NC
NM-
CPU
82
IN
Pull up
nSelectIn1
ASIC
(ICU)
(ICU)
94
IN
LOW when in the
compatible mode
compatible mode
nSelectIn2
ASIC
(ICU)
(ICU)
69
IN
LOW when in the
compatible mode
compatible mode
nSelectIn3
ASIC
(ICU)
(ICU)
45
IN
LOW when in the
compatible mode
compatible mode
NStrobe1
ASIC
(ICU)
(ICU)
118
IN
LOW during forward data
transmission (Indicates that
the transmitted data are
effective.)
transmission (Indicates that
the transmitted data are
effective.)
nStrobe2
ASIC
(ICU)
(ICU)
93
IN
LOW during forward data
transmission (Indicates that
the transmitted data are
effective.)
transmission (Indicates that
the transmitted data are
effective.)
nStrobe3
ASIC
(ICU)
(ICU)
68
IN
LOW during forward data
transmission (Indicates that
the transmitted data are
effective.)
transmission (Indicates that
the transmitted data are
effective.)
OE
ASIC
63
OUT
DRAM (page memory) read
enable signal
enable signal
Signal
name
Device
Pin
No.
No.
Input/
Output
Content
Remark
OP_CLK
CPU
63
OUT
Clock signal to the operation
panel
panel
OP_DATA
CPU
59
OUT
Data signal to the operation
panel
panel
OP_KIN1
CPU
70
IN
Key input 1
OP_KIN2
CPU
71
IN
Key input 2
OP_LATCH
ASIC
199
OUT
Panel data latch signal
OP_PSW
CPU
69
IN
PRINT SWITCH
OP_RXD
CPU
61
OUT
Operation panel reception
buffer
buffer
NC
OPIRQ-
CPU
30
IN
Operation panel
NC
OSCSEL
ASIC
(ICU)
(ICU)
141
IN
Fixed. (HIGH)
OUTD0
ASIC
65
OUT
(NC)
OUTD1
ASIC
66
OUT
(NC)
OUTD10
ASIC
78
OUT
(NC)
OUTD11
ASIC
77
OUT
(NC)
OUTD12
ASIC
79
OUT
(NC)
OUTD13
ASIC
80
OUT
(NC)
OUTD14
ASIC
81
OUT
(NC)
OUTD15
ASIC
82
OUT
(NC)
OUTD2
ASIC
67
OUT
(NC)
OUTD3
ASIC
68
OUT
((NC)
OUTD4
ASIC
70
OUT
(NC)
OUTD5
ASIC
71
OUT
(NC)
OUTD6
ASIC
73
OUT
(NC)
OUTD7
ASIC
74
OUT
(NC)
OUTD8
ASIC
75
OUT
(NC)
OUTD9
ASIC
76
OUT
(NC)
PARAD0
ASIC
102
IN/OUT (NC)
PARAD1
ASIC
103
IN/OUT (NC)
PARAD2
ASIC
104
IN/OUT (NC)
PARAD3
ASIC
105
IN/OUT (NC)
PARAD4
ASIC
106
IN/OUT (NC)
PARAD5
ASIC
107
IN/OUT (NC)
PARAD6
ASIC
109
IN/OUT (NC)
PARAD7
ASIC
110
IN/OUT (NC)
PCLACK
ASIC
86
IN
(NC)
PCLCS
ASIC
87
IN
(NC)
PCLPRD
ASIC
84
IN
(NC)
PCLREQ
ASIC
85
OUT
(NC)
PE
ASIC
119
OUT
(NC)
PEMP
CPU
32
IN
Paper empty sensor
PError1
ASIC
(ICU)
(ICU)
100
OUT
Identification signal of nInit
signal which shows data
direction (reverse/forward)
signal which shows data
direction (reverse/forward)
PError2
ASIC
(ICU)
(ICU)
76
OUT
Identification signal of nInit
signal which shows data
direction (reverse/forward)
signal which shows data
direction (reverse/forward)
PError3
ASIC
(ICU)
(ICU)
52
OUT
Identification signal of nInit
signal which shows data
direction (reverse/forward)
signal which shows data
direction (reverse/forward)
PFCLK
ASIC
125
IN
Write clock
PIN-
CPU
97
IN
Paper feed sensor
PMCLK
CPU
75
OUT
Polygon motor clock signal
PMD-
ASIC
217
OUT
Polygon motor drive signal
POUT-
CPU
98
IN
Paper exit sensor
PR
ASIC
221
OUT
Power relay control
PRSTART
ASIC
2
IN
Print start trigger signal
PRSTART-
ASIC
209
OUT
Print start signal
PRSTT
ASIC
207
OUT
Pritn start
PRSTT
ASIC
(ICU)
(ICU)
3
IN
Print start
PSIZE
CPU
127
IN
Paper size sensor
PUS
ASIC
228
OUT
Pickup solenoid
PWMCL
CPU
74
OUT
Copy lamp PWM control
NC
PWMSIN
CPU
73
OUT
Sine waveform overlapping
MC
MC
11 – 4
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