AL-1566 (serv.man15). Electrical section - Sharp Copying Equipment Service Manual (repair manual). Page 4

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AL-1556/1566  ELECTRICAL SECTION  12 - 4
b. ASIC (Signal table)
PIN 
No.
Signal Name
IN/OUT Connected to
Description
1
cpudata7
IN/OUT CPU
CPU data bus
2
cpudata6
IN/OUT CPU
CPU data bus
3
cpudata5
IN/OUT CPU
CPU data bus
4
cpudata4
IN/OUT CPU
CPU data bus
5
VCC_AC
Power
6
cpudata3
IN/OUT CPU
CPU data bus
7
cpudata2
IN/OUT CPU
CPU data bus
8
cpudata1
IN/OUT CPU
CPU data bus
9
cpudata0
IN/OUT CPU
CPU data bus
10
GND_AC
Power
11
mircnt
OUT
Buffer IC
SPF scanner select 
signal 
12
cpusync
OUT
CPU
CPU SYNC signal
13
mem_intr
Not used
14
arb_intr
OUT
CPU
INTR signal
15
VCC_core
Power
16
cpu_ad8
IN
CPU
CPU address bus
17
cpu_ad7
IN
CPU
CPU address bus
18
cpu_ad6
IN
CPU
CPU address bus
19
cpu_ad5
IN
CPU
CPU address bus
20
GND_core
Power
21
ram_clk_in
IN
ASIC
SDRAM clock on the 
board
22
cpu_ad4
IN
CPU
CPU address bus
23
cpu_ad3
IN
CPU
CPU address bus
24
cpu_ad2
IN
CPU
CPU address bus
25
cpu_ad1
IN
CPU
CPU address bus
26
cpu_ad0
IN
CPU
CPU address bus
27
xcpucs
IN
CPU
CS signal
28
sfclk
IN
Oscillator
Clock
29
GND_core
Power
30
xcpuwr
IN
CPU
CPU write signal
31
xcpurd
IN
CPU
CPU read signal
32
nrst
IN
SYSTEM 
RESET
SYSTEM RESET
33
VCC_core
Power
34
pfclk2
IN
Not used
35
clock_sw
IN
Pull up
36
GND_core
Power
37
pfclk1_xout
OUT
X-tal units
VIDEO clock
38
pfclk1
IN
X-tal units
VIDEO clock
39
VSSPLL2
Pull up
40
VDDPLL2
Pull up
41
VSS2
Pull up
42
VDDI2
Pull up
43
tm2_15m
Pull up
44
xsync
IN
LSU
Horizontal sync 
signal from LSU 
(/SYNC)
45
GND_AC
Power
46
xld
OUT
LSU
Laser drive signal 
47
xlend
OUT
LSU
Laser APC signal 
48
VCC_AC
Power
49
mmd
OUT
Tr array IC
Main motor control 
signal. "H": Main 
motor ON
50
pmd
OUT
I/O
Polygon motor drive
51
tc
OUT
Tr array IC
 Transfer charger 
control signal. "H":ON
52
gridl
OUT
Tr array IC
Main charger grid 
control signal. "H": L 
output
53
mc
OUT
Tr array IC
Main charger control 
signal. "H": ON
54
bias
OUT
I/O
HV bias drive
55
NC
OUT
I/O
Not used
56
vfmcnt
OUT
Tr array IC
Ventilation fan 
rotation speed control 
signal. "H": High 
speed, "L": Low 
speed
57
VCC_core
Power
58
vfm
OUT
Tr  array IC
Ventilation fan control 
signal. "H": Fan ON
59
/FPOFF
OUT
I/O
FAX poff signal
60
GND_core
Power
61
DEV DIR
OUT
I/O
CRUM bus control
62
spfclh
OUT
Tr array IC
SPF/RSPF resist 
roller clutch control 
signal "H":ON
63
spfrsol
OUT
Tr array IC
SPF/RSPF document 
feed solenoid control 
signal "H":ON
64
spfgsol
OUT
Tr array IC
SPF/RSPF gate 
solenoid control 
signal "H":ON
65
spfpsol
OUT
Tr array IC
SPF/RSPF document 
transport solenoid 
control signal "H":ON
66
VCC_core
Power
67
bias
OUT
Tr array IC
DV bias control 
signal. "H":ON
68
lden
OUT
Tr array IC
Laser circuit control 
signal. "H": Laser 
circuit ON
69
GND_AC
Power
70
MRPS1
OUT
I/O
SPF current control
71
MRPS2
OUT
I/O
SPF current control
72
MRPS3
OUT
I/O
SPF current control
73
CPFS1
OUT
I/O
1st cassette pick up 
solenoid
74
VCC_AC
Power
75
CPFS2
OUT
I/O
2nd cassette pick up 
solenoid
76
pr
OUT
I/O
Power relay control
77
hl
OUT
Tr array IC
Heater lamp control 
signal. "H":ON
78
GND_core
Power
79
MPFS
OUT
I/O
Multi-bypass solenoid
80
miron
OUT
Buffer IC
SPF scanner select 
signal 
81
spfon
OUT
Buffer IC
SPF ON signal
82
KEYSC1
OUT
I/O
Key sense control
83
KEYSC2
OUT
I/O
Key sense control
84
KEYSC3
OUT
I/O
Key sense control
85
IMC ready
OUT
I/O
IMC control
86
VCC_core
Power
87
tmx
OUT
Buffer IC
Toner motor control 
signal 
88
tm
OUT
Buffer IC
Toner motor control 
signal 
89
op_data
OUT
Tr array IC
Operation circuit data 
signal
90
ope_latch
OUT
Tr array IC
Operation circuit latch 
signal. Data take-in at 
"L"
91
GND_AC
Power
PIN 
No.
Signal Name
IN/OUT Connected to
Description
Display
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