Service manual

20
R-201FK/W
R-203FW
R-205FW
R-206FW
Pin No. Signal I/O Description
25 K01 IN
Signal similar to K02.
When either G9 line on key matrix is touched, a corresponding signal will be input into
K01.
26 K02 IN
Signal coming from touch key.
When either G10 line on key matrix is touched, a corresponding signal out of R00, R01,
R02, R03, P20 and P21 will be input into K02. When no key is touched, the signal is
held at “H” level.
27 K03 IN Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
28 COM0 OUT Common data signal.
Connected to LCD (Pin No. COM1)
29 COM1 OUT
Common data signal.
Connected to LCD (Pin No. COM2)
30 COM2 OUT Common data signal.
Connected to LCD (Pin No. COM3)
31 COM3 OUT Terminal not used.
32-33 SEG0-SEG1 OUT Terminal not used.
34 SEG2 OUT Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2).
The signals holds “L” level during micro-
wave cooking 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.
35 SEG3 OUT Terminal not used.
36 SEG4 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.
37-39 SEG5-SEG7 OUT Terminal not used.
40-51 SEG8-SEG19 OUT Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.) LCD segment LSI signal (Pin No.) LCD segment
SEG 8 (40)
....................
SEG 12 SEG 14 (46)
.....................
SEG 6
SEG 9 (41)
....................
SEG 11 SEG 15 (47)
.....................
SEG 5
SEG 10 (42)
....................
SEG 10 SEG 16 (48)
.....................
SEG 4
SEG 11 (43)
....................
SEG 9 SEG 17 (49)
.....................
SEG 3
SEG 12 (44)
....................
SEG 8 SEG 18 (50)
.....................
SEG 2
SEG 13 (45)
....................
SEG 7 SEG 19 (51)
.....................
SEG 1
52-53 VC1-VC2 IN Power source voltage input terminal.
Standard voltage for LCD.
54 VC3 OUT Terminal not used.
H : GND
L (-5V)
16.7 msec.
Maximaum
output
70% of maximaum
output
H : GND
L : -5V
H : GND
L : -5V
ON
ON
OFF
OFF OFF
24 sec.
8 sec.
16.7 msec.
During cooking
H : GND
L : -5V