Read Sharp R-750AM (serv.man2) Service Manual online
8
750A -
29
R42
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay
(RY3). In 100% POWER opera-
tion, 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 rep-
etition according to the power
level.
(RY3). In 100% POWER opera-
tion, 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 rep-
etition according to the power
level.
30
R43
OUT
Oven lamp, fan motor and turntable motor driving signal.
To turn on and off shut off relay (RY1). The
square waveform voltage is delivered to
the RY1 driving circuit.
square waveform voltage is delivered to
the RY1 driving circuit.
31
R50
IN
Signal coming from touch key.
When any one of G-1 line keys on key matrix is touched, a corresponding signal from
R60, R61, R62, R63, R72 and R73 will be input into R50. When no key is touched,
the signal is held at "H" level.
When any one of G-1 line keys on key matrix is touched, a corresponding signal from
R60, R61, R62, R63, R72 and R73 will be input into R50. When no key is touched,
the signal is held at "H" level.
32
R51
IN
Signal similar to R50.
When any one of G-2 line keys on key matrix is touched, a corresponding signal will
be input into R51.
When any one of G-2 line keys on key matrix is touched, a corresponding signal will
be input into R51.
33
R52
IN
Signal similar to R50.
When any one of G-3 line keys on key matrix is touched, a corresponding signal will
be input into R52.
When any one of G-3 line keys on key matrix is touched, a corresponding signal will
be input into R52.
34
R53
IN
Signal similar to R50.
When any one of G-4 line keys on key matrix is touched, a corresponding signal will
be input into R53.
When any one of G-4 line keys on key matrix is touched, a corresponding signal will
be input into R53.
35
R60
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R50 - R53 terminal
while one of G5 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to R50 - R53 terminal
while one of G5 line keys on key matrix is touched.
36
R61
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R50 - R53 terminal
while one of G6 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to R50 - R53 terminal
while one of G6 line keys on key matrix is touched.
37
R62
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R50 - R53 terminal
while one of G7 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to R50 - R53 terminal
while one of G7 line keys on key matrix is touched.
38
R63
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R50 - R53 terminal
while one of G8 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to R50 - R53 terminal
while one of G8 line keys on key matrix is touched.
39-40
R70-R71
OUT
Terminal not used.
41
R72
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R50 - R53 terminal
while one of G10 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to R50 - R53 terminal
while one of G10 line keys on key matrix is touched.
42
R73
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R50 - R53 terminal
while one of G9 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to R50 - R53 terminal
while one of G9 line keys on key matrix is touched.
Pin No.
Signal
I/O
Description
ON/OFF time ratio in
Micro cooking
(a. 48second time base)
Micro cooking
(a. 48second time base)
ON/OFF time ratio in
Micro cooking
(a. 32second time base)
Micro cooking
(a. 32second time base)
MICRO
ON
OFF
COOK
100%
100%
32sec.
0sec.
70%
24sec.
8sec.
50%
18sec.
14sec.
30%
12sec.
20sec.
10%
6sec.
26sec.
MICRO
ON
OFF
COOK
100%
100%
48sec.
0sec.
70%
36sec.
12sec.
50%
26sec.
22sec.
30%
16sec.
32sec.
10%
8sec.
40sec.
20.0 msec
During cooking
H : +5V
L : 0V
TOUCH CONTROL ASSEMBLY/ DESCRIPTION OF LSI
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