Sharp R-15AM Service Manual page 19

Pin No. Signal I/O
29 R42 OUT
30 R43 OUT
31-33 R50-R52 OUT
34 R53
35 R60 OUT
36 R61 OUT
37 R62 OUT
38 R63 OUT
39-42 R70-R73 OUT
43-54 SEG0 - OUT
SEG11
55-57 SEG12- OUT
SEG14
58 VDD
59-64 SEG15- OUT
SEG20
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY3).
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.
Oven lamp, fan motor and antenna motor driving signal.
To turn on and off shut off relay (RY1). The
square waveform voltage is delivered to
the RY1 driving circuit.
Terminal not used.
IN Signal coming from tact switch.
When either of tact switches SW60-SW63 is touched, a corresponding signal
out of R60, R61, R62 and R63 will be input into R53. When no key is touched,
the signal is held at "H" level.
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to R53 terminal
while the tact switch SW60 is touched.
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to R53 terminal
while the tact switch SW61 is touched.
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to R53 terminal
while the tact switch SW62 is touched.
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to R53 terminal
while the tact switch SW63 is touched.
Terminal not used.
Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.)
SEG 0 (43) ............................ S12
SEG 1 (44) ............................ S11
SEG 2 (45) ............................ S10
SEG 3 (46) .............................. S9
SEG 4 (47) .............................. S8
SEG 5 (48) .............................. S7
Terminal not used.
IN Power source voltage input terminal.
Connected to GND.
Terminal not used.
Description
LCD segment LSI signal (Pin No.) LCD segment
SEG 6 (49) ............................ S6
SEG 7 (50) ............................ S5
SEG 8 (51) ............................ S4
SEG 9 (52) ............................ S3
SEG 10 (53) .......................... S2
SEG 11 (54) .......................... S1
17
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.
20.0 msec
H : +5V
L : 0V
During cooking
R-15AM