Service manual

R-21HT
R-21HV
19
1 VCC IN Power source voltage: +5V.
VC voltage of power source circuit input.
2/3 VEE/AVSS IN Connected to GND
4 VREF IN Connected to VC. (+5V)
5-6 AN7-AN6 IN Terminal not used.
7-8 AN5-AN4 IN Terminal to change functions according to the model.
Signal in accordance with the model in operation is applied to set up its function.
9-10 AN3-AN2 IN Terminal not used.
11 AN1 IN Input signal which communicates the door open/close information to LSI.
Door closed; "L" level signal (0V).
Door opened; "H" level signal (+5V).
12 AN0 IN Terminal not used.
13 P55 OUT Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay. In 100% power level operation, "H" level during
cooking; "L" level otherwise. In other power level operation (90,80,70,60,50,40,30,20,10
or 0%), "H" and "L" level is repeated according to power level.
Power level ON OFF Power level ON OFF
100% 32sec. 0sec. 40% 16sec. 16sec.
90% 30sec. 2sec. 30% 12sec. 20sec.
80% 26sec. 6sec. 20% 8sec. 24sec.
70% 24sec. 8sec. 10% 6sec. 26sec.
60% 22sec. 10sec. 0% 0sec. 32sec.
50% 18sec. 14sec.
14-15 P54-P53 OUT Terminal not used.
16-18 P52-P50 IN Terminal not used.
19 P47 OUT Signal to sound buzzer.
This signal is to control the 2.5kHz
continuous signal through IC3.
A: key touch sound.
B: Guidance sound.
C: Completion sound.
20 P46 OUT Oven lamp, Fan motor and Antenna motor driving signal. (Square Waveform :
60Hz)
To turn on and off the shut-off relay (RY3). The
Square waveform voltage is delivered to the
RY3 driving circuit and relays(RY2, COOK
RELAY) control circuit.
21 P45 OUT Digit selection signal.
The relation between digit signal and digit are
as follows:
Digit signal Digit
P42................. 1st.
P43................ 2nd.
P44................. 3rd.
P45................. 4th.
Normally, one pulse is output in every ß period,
and input to the grid of the light-emitting diode.
H
L
+5V
ß(60Hz)
P42
P43
P44
P45
GND
Pin No. Signal I/O Description
DESCRIPTION OF LSI
LSI(IZA897DR)
The I/O signal of the LSI(IZA897DR) is detailed in the following table.
+5V
GND
32 sec.
ON
OFF
H
L
16.7 msec
During cooking
A
0.1 sec
2 sec
1 sec
+5V
GND
T
200µsec.
200µsec.
1 sec
B
+5V
GND
C
+5V
GND