Service manual

21
R-320HK
R-320HQ
R-320HW
Pin No. Signal I/O Description
9 AN1 IN AH sensor input.
This input is an analog input terminal from the AH sensor circuit, and connected to the A/D
converter built into the LSI.
10 AN0 IN Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is an
analog input terminal from the AH sensor circuit, and connected to the A/D converter built into
the LSI.
11-13 P57-P55 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor).
14 CNTR0 OUT
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
15 P53 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor).
16 P52 OUT
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.
17 P51 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor).
18 P50 OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). The
signals holds “L” level during microwave cook-
ing 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.
19 P47 IN
Signal similar to AN3.
When either G13 line on key matrix is touched, a corresponding signal will be input into P46.
20 P46 OUT Terminal not used.
21 P45 IN
Signal similar to AN3.
When either G12 line on key matrix is touched, a corresponding signal will be input into P45.
22-23 P44-P43 OUT Terminal not used.
24 INT0 IN
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
25 P41 IN Signal similar to AN3.
When either G11 line on key matrix is touched, a corresponding signal will be input into P41.
26 P40 IN Connected to GND through the pull-down resistor.
27 RESET IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied.
28 P71 IN
Signal similar to AN3.
When either G10 line on key matrix is touched, a corresponding signal will be input into P71.
29 P70 IN
Signal similar to ANI3.
When either G9 line on key matrix is touched, a corresponding signal will be input into P70.
30 XIN IN
Internal clock oscillation frequency control input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect
to XOUT terminal.
31 XOUT OUT
Internal clock oscillation output.
Output to control oscillation input to XIN.
32 VSS IN
Power source voltage : -5.0V.
The power source voltage to the drive LSI is input to VSS terminal. Connected to VC.
A
B
0.1 sec.
2.0 sec.
H : GND
L : -5V
H : GND
L : -5V
16.7 msec.
During cooking
H : GND
L : -5V
Maximum
output
70% of maximum
output
H : GND
L : -5V
H : GND
L : -5V
ON
ON
OFF
OFF OFF
24 sec.
8 sec.
16.7 msec.
H : GND
L : -5V