Sharp R-1880LS Service Manual page 35

Pin No. Signal I/O
18 P50 OUT
19 P47 OUT
0 P46 OUT
1 P45 OUT
 P44 OUT
3 P43 OUT
4 P4 IN
5 INT1 IN
6 P40 IN
7 RST IN
8 P71 OUT
9 P70 OUT
30 XIN IN
31 XOUT OUT
Convection motor driving signal.
To turn on and off shut-off relay(RY7). "L" level during
CONVECTION; "H" level otherwise.
Hood lamp driving signal.
To turn on and off relay(RY8). "L" level: During Hood
lamp ON. "H" level: During Hood lamp OFF.
Hood motor driving signal.
To turn on and off relay(RY9). "L" level: During Hood
motor ON. "H" level: During Hood motor OFF.
Hood motor high / low driving signal.
To turn on and off relay(RY10). "L" level: During Hood
motor high. "H" level: During Hood motor low.
Timing signal output terminal for temperature measurement(OVEN).
"L" level (GND): Thermistor OPEN timing.
"H" level (-5V): Temperature measuring timing. (Convection cooking)
Signal to sound buzzer.
A: key touch sound.
B: Completion sound.
C: When the temperature of the oven cavity reaches the
preset temperature in the preheating mode, or when the
preheating hold time (30 minutes) is elapsed.
Input signal which communicates the damper open/close information to LSI.
Damper opened; "L" level signal(0V:GND).
Damper closed; "H" level signal(-5V).
Signal to synchronize LSI with commercial power source freqency.
This is the basic timing for all real time processing of LSI.
Connected to VC.
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily set to "L"
level the moment power is applied, at this time the LSI is reset. Thereafter set at "H" level.
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay(RY).
In P-HI operation, the signals holds "L"
level during microwave cooking and
"H" level while not cooking. In other
cooking modes (P-90,P-80,P-70,P-
60,P-50,P-40,P-30,P-0,P-10,P-0) the
signal turns to "H" level and "L" level
in repetition according to the power
level.
Heating element driving signal.
To turn on and off shut-off relay(RY3). "L" level during convection cooking; "H" level other-
wise. During convection cooking, the signal becomes
"H" level when the temperature of the oven cavity exceeds
the predetermined temperature.
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect
to XOUT terminal.
Internal clock oscillation frequency control output.
35
Description
ON
A
B
1 sec
C
VARI-MODE
P-HI (100% power)
P-90 (approx. 90% power)
P-80 (approx. 80% power)
P-70 (approx. 70% power)
P-60 (approx. 60% power)
P-50 (approx. 50% power)
P-40 (approx. 40% power)
P-30 (approx. 30% power)
P-0 (approx. 0% power)
P-10 (approx. 10% power)
P-0 (0% power)
R-1880LS/LST
H. GND
During
OFF
cooking
(Convection)
L
H : GND
OFF
ON L
H : GND
OFF
ON L
H : GND
OFF
L
ON
0.1 sec
2 sec
1 sec
H: GND
L
H : GND
L (-5V)
16.7 msec
ON TIME OFF TIME
3 sec. 0 sec.
30 sec.  sec.
6 sec. 6 sec.
4 sec. 8 sec.
 sec. 10 sec.
18 sec. 14 sec.
16 sec. 16 sec.
1 sec. 0 sec.
8 sec. 4 sec.
6 sec. 6 sec.
0 sec. 3 sec.
H. GND
During
OFF
cooking
(Convection)
ON
L