20
R-763 -
Pin No. Signal I/O Description
28 R41 OUT Grill heating element driving signsl.
To turn on and off the grill heating element
relay (RY2). "L" level during grill cooking or
dual cooking; "H" level otherwise.
(Grill or dual)
ON
OFF
During
cooking
L
GND
H.
DESCRIPTION OF LSI
ON/OFF time ratio in Mi-
cro cooking
(a. 48second time base)
ON/OFF time ratio in Mi-
cro cooking
(a. 32second 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 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 repetition
according to the power level.
30 R43 OUT Oven lamp, fan motor and turntable motor driving signal.
31 R50 IN Signal coming from tact switch.
When tact switches SW1 is touched, a signal out of R61 will be input into R50. When
no tact switch is touched, the signal is held at "H" level.
32 R51 IN
Signal coming from tact switch.
When either of tact switches SW2 and SW5 is touched, a corresponding signal out
of R60 and R61 will be input into R51. When no tact switch is touched, the signal is
held at "H" level.
33 R52 IN
Signal coming from tact switch.
When either of tact switches SW3 and SW6 is touched, a corresponding signal out
of R60 and R61 will be input into R52. When no tact switch is touched, the signal is
held at "H" level.
34 R53 IN
Signal coming from tact switch.
When either of tact switches SW4 and SW7 is touched, a corresponding signal out
of R60 and R61 will be input into R53. When no tact switch is touched, the signal is
held at "H" level.
35 R60 OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to R51, R52 or R53
terminal while the tact switch SW5, SW6 or SW7 is touched.
36 R61 OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to R50, R51, R52 or R53
terminal while the tact switch SW1, SW2, SW3 or SW4 is touched.
37-38 R62-R63 OUT Terminal not used.
39-42 R70-R73 OUT Terminal not used.
43-54 SEG0 - OUT
Segment data signal.
SEG11 Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.) LCD (Pin No.) LSI signal (Pin No.) LCD (Pin No.)
SEG 0 (1) ............................. S12(4) SEG 6 (7) .......................... S6(10)
SEG 1 (2) ............................. S11(5) SEG 7 (8) .......................... S5(11)
SEG 2 (3) ............................. S10(6) SEG 8 (9) .......................... S4(12)
SEG 3 (4) ............................... S9(7) SEG 9 (10) ........................ S3(13)
SEG 4 (5) ............................... S8(8) SEG 10 (11) ...................... S2(14)
SEG 5 (6) ............................... S7(9) SEG 11 (12) ...................... S1(15)
55-57 SEG12- OUT Terminal not used.
SEG14
58 VDD IN
Power source voltage input terminal.
Connected to GND.
59-64 SEG15- OUT Terminal not used.
SEG20
20.0 msec
During cooking
H : +5V
L : 0V
To turn on and off shut off relay(RY1)
The square waveform voltage is delivered
to RY1 driving circuit.
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