Sharp R-677W Service Manual page 21

LSI(IXA201DR)
The I/O signal of the LSI(IXA201DR) are detailed in the following table.
Pin No. Signal
12 P56
13 P55
14 P54
15 P53
16 P52
17 P51
18 P50
19 P47
20-22 P46-P44
23 INT1
24 INT0
25 P41
26 P40
DESCRIPTION OF LSI
I/O
OUT Oven lamp and turntable motor driving signal(Square Waveform : 50Hz).
To turn on and off shut-off relay (RY1).
The square waveform voltage is
delivered to the relay (RY1) driving
circuit .
OUT Terminal not used.
OUT Signal to sound buzzer.
A: key touch sound.
B: Completion sound.
OUT Touch control transformer driving signal.
To turn on and off the shut off relay ( RY6). If the oven has not been used for more
than 2 minutes, the relay RY6 will be turned off. The relay RY6 will be turned on
when the oven door is opened and closed.
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.
OUT Grill heater (TOP HEATER) driving signal.
To turn on and off the grill heater relay
(RY3). "L" level during grill (TOP GRILL,
TOP AND BOTTOM) cooking or dual
(MICRO+TOP) cooking. "H" level
otherwise.
OUT Bottom heater driving signal.
To turn on and off the bottom relay (RY4).
"L" level during grill (BOTTOM HEATER,
TOP AND BOTTOM) cooking or dual
(MICRO+BOTTOM) cooking. "H" level
otherwise.
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.
OUT Terminal not used.
IN Signal coming from encoder.
When the encoder is turned, the contacts of encoder make pluse signals. And
pulse signals are input into INT1.
IN Signal to synchronized LSI with commercial power source frequency
(50Hz).
This is basic timing for time processing of LSI.
IN Signal coming from encoder.
Signal similar to INT1. Pulse signals are input into P41.
IN Connected to VC.
CONT
Description
ON/OFF time ratio in Mi-
cro cooking
(a. 32second time base)
MICRO
COOK
100%
70%
50%
30%
10%
R-677 - 21
...
20 msec
During cooking
0.12 sec
A
2.4 sec
B
OFF
ON
During cooking, or for 5 minutes
after grill cooking, or dual cooking
During
cooking
(Grill or dual)
ON
During
cooking
(Grill or dual)
ON
ON/OFF time ratio in Mi-
cro cooking
(a. 48second time base)
ON OFF MICRO
COOK
32sec. 0sec. 100%
24sec. 8sec. 70%
18sec. 14sec. 50%
12sec. 20sec. 30%
6sec. 26sec. 10%
20 msec
H
L
H: GND
L
H: GND
L
H. GND
L
H. GND
OFF
L
H.
GND
OFF
L
ON OFF
48sec. 0sec.
36sec. 12sec.
26sec. 22sec.
16sec. 32sec.
8sec. 40sec.
H : GND
L (-5V)