R-951M - Sharp Home Appliance Service Manual (repair manual). Page 11

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R-951M  -  11
ON
OFF
During
cooking
L
GND
H.
(Grill or dual)
Pin No.
Signal
I/O
Description
ON/OFF time ratio in Micro
cooking
(a. 32second time base)
ON/OFF time ratio in Micro
cooking
(a. 48second time base)
MICRO
ON
OFF
COOK
100%
32sec.
0sec.
70%
24sec.
8sec.
50%
18sec.
14sec.
30%
12sec.
20sec.
10%
6sec.
26sec.
MICRO
ON
OFF
COOK
100%
48sec.
0sec.
70%
36sec.
12sec.
50%
26sec.
22sec.
30%
16sec.
32sec.
10%
8sec.
40sec.
29
P75
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook
relay (RY2). In 100%
POWER operation,  the
signals hold "L" level during
microwave cooking and "H"
level while not cooking. In
other cooking modes (70%,
50%, 30%, 10%) the signal
turns to "H" level and "L" level
in  repetition according to the
power level.
30
P74
OUT
Terminal not used.
31
P73
OUT
Damper motor relay driving signal.
To turn on and off shut-off relay (RY7).
32
P72
OUT
Fan motor driving signal.
To turn on and off the fan motor
relay RY5.  "L" level during cooking,
or for 5 minutes after grill cooking or
dual cooking. "H" level otherwise.
33
P71
IN
Convection motor driving signal.
To turn on and off shut-off relay
(RY6). "L" level during
CONVECTION; "H" level otherwise.
34
P70
IN
Connected to VC.
35
RESET
IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied.
Temporarily set to "L" level the moment power is applied, at this time the LSI
is reset. Thereafter set at "H" level.
36
XCIN
IN
Terminal not used.
37
XCOUT
OUT
Terminal not used.
38
XIN
IN
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation
circuit with respect to XIN terminal.
39
XOUT
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XOUT.
40
VSS
IN
Power source voltage: -5V.
VC voltage of power source circuit input.
41-44
P27-P24
IN/OUT
Terminal not used.
45
P23
IN
Signal coming from touch key.
When any one of G2 line keys on key matrix is touched, a corresponding
signal   from P11, P12, P13, P14, P15, P16 and P17 will be input into P23.
When no key is touched, the signal is held at "L" level.
46
P22
IN
Signal similar to P23.
When any one of G5 and G9 line keys on key matrix is touched, a
corresponding signal will be input into P22.
47
P21
IN
Signal similar to P23.
When any one of G7 line keys on key matrix is touched, a corresponding
signal will be input into P21.
48
P20
IN
Signal similar to P23.
When any one of G11 line keys on key matrix is touched, a corresponding
signal will be input into P20.
ON
OFF
L
GND
H.
ON
OFF
During cooking, or for 5 minutes or more
after grill cooking, convection cooking or 
dual cooking
L
GND
H.
ON
OFF
During
cooking
L
GND
H.
(Convection or dual)
28
P76
OUT
Grill heating element driving signal.
To turn on and off the bottom element
relay (RY4). "L" level during grill
cooking or dual  cooking, "H" level
otherwise.
TOUCH CONTROL 
CONT
...
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