Service manual

22
DMO2420B
DMO2420R
DMO2420S
LSI(IXA098DR)
The I/O signal of the LSI(IXA098DR) is detailed in the following table.
Pin No. Signal I/O Description
1 COM5 OUT
Common data signal : COM11.
Connected to LCD signal COM11.
2 COM4 OUT Common data signal : COM12.
Connected to LCD signal COM12.
3 COM3 OUT
Common data signal : COM13.
Connected to LCD signal COM13.
4 COM2 OUT
Common data signal : COM14.
Connected to LCD signal COM14.
5 COM1 OUT Common data signal : COM15.
Connected to LCD signal COM15.
6 COM0 OUT Common data signal : COM16.
Connected to LCD signal COM16.
7-10 VL1-VL4 IN Power source voltage input terminal.
Standard voltage for LCD.
11 VL5 IN Power source voltage input terminal.
Standard voltage for LCD. Connected to GND.
12-14 C3-C1 IN Terminal not used.
15 VLIN IN Terminal not used.
16 VREG OUT Terminal not used.
17 NC
_
Terminal not used.
18 VSS IN Power source voltage : -5.0V.
The power source voltage to the LSI is input to VSS terminal. Connected to VC.
19-21 P27-P25 OUT Terminal not used.
22-26 P24-P20 IN Used for initial balancing of the bridge circuit (absolute humidity sensor).
27 P47 IN To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door open "L" level signal (-5V).
28 P46 OUT Terminal not used.
29 P45 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.
30 P44 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.
(ON and OFF times for other power level.)
31 P43 OUT Terminal not used.
32 CNTR0 OUT Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
33 P41 OUT Terminal not used.
16.7 msec.
During cooking
H : GND
L : -5V
100
PERCENT
70
PERCENT
H : GND
L : -5V
H : GND
L : -5V
ON
ON
OFF
OFF OFF
24 sec.
8 sec.
A
B
0.1 sec.
2.0 sec.
H : GND
L : -5V
H : GND
L : -5V