Sharp R-880B Service Manual page 24

R-880B
Pin No. Signal
25 P41 OUT
26 P40 OUT
27 P77 OUT
28 P76 OUT
29 P75 OUT
30 P74 OUT
31 P73 OUT
32 P72 OUT
33 P71 OUT
34 P70
35 RESET
36 P81 OUT
37 P80 OUT
I/O
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal
while one of G8 line key on matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal
while one of G7 line key on matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal
while one of G6 line key on matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal
while one of G5 line key on matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal
while one of G4 line key on matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal
while one of G3 line key on matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal
while one of G2 line key on matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal
while one of G1 line key on matrix is touched.
Oven lamp and turntable motor driving signal(Square Waveform : 50Hz).
To turn on and off shut-off relay
(RY6). The square waveform voltage
is delivered to the relay (RY6) driving
circuit.
IN Connected to VC.
IN 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 (RY2). In 100%
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.
Grill heaters (TOP HEATER) driving signal.
To turn on and off the grill heaters
relay (RY3). "L" level during grill
(TOP GRILL, TOP AND
BOTTOM) cooking, Convection
cooking or Mix top grill cooking,
"H" level otherwise.
The heater relay turns on and off
within a 48 second time base in
accordance with the special
program in LSI.
Description
ON/OFF time ratio in Mi-
cro cooking
(a. 32second time base)
MICRO ON
COOK
100% 32 sec.
70% 24 sec.
50% 18 sec. 14 sec.
30% 12 sec. 20 sec.
10% 6 sec. 26 sec.
Power output
100 %
90 %
80 %
70 %
60 %
50 %
40 %
30 %
20 %
10 %
22
20 msec.
H
L
During cooking
ON/OFF time ratio in Mi-
cro cooking
(a. 48second time base)
OFF MICRO ON OFF
COOK
100% 48 sec. 0 sec.
0 sec.
70% 36 sec. 12 sec.
8 sec.
50% 26 sec. 22 sec.
30% 16 sec. 32 sec.
10% 8 sec. 40 sec.
ON time OFF time
48 sec. 0 sec.
44 sec. 4 sec.
40 sec. 8 sec.
36 sec. 12 sec.
32 sec. 16 sec.
26 sec. 22 sec.
22 sec. 26 sec.
16 sec. 32 sec.
12 sec. 36 sec.
8 sec. 40 sec.