Sharp R-420DK Service Manual page 24

R - 4 2 0 D K
R-420DW
Pin No. Signal
12 RESET
13 INTP0
14 INTP1
15 P02 OUT
16 P03 OUT
17 P04 OUT
18 P05 OUT
19 P110 OUT
20 P111 OUT
21 P112 OUT
22 P113 OUT
I/O
IN Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily
set "L" level the moment power is applied, at this time the LSI is reset. Thereafter set
at "H" level.
IN Connected to VC.
IN Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
Terminal not used.
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). The
signals holds "L" level during microwave
cooking and "H" level while not cooking. In
other cooking modes (variable cooking) the
signal turns to "H" level and "L" level in
repetition according to the power level.
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 and RY2 control circuit.
Terminal not used.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102
and P103 terminal while one of G8 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to ANI6, ANI7, P100,
P101, P102 and P103 terminal while one of G7 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102
and P103 terminal while one of G6 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102
and P103 terminal while one of G5 line keys on key matrix is touched.
Description
(ON and OFF times for other power level.)
22
16.7 msec.
OFF
H : GND
P-HI
ON
L : -5V
OFF OFF
H : GND
24 sec.
P-70
8 sec.
ON
L : -5V
16.7 msec.
During cooking
H : GND
L : -5V
H : GND
L : -5V