Sharp R-202EW Service Manual page 22

R-202EW
R-203EW
Pin No. Signal
24 K00
25 K01
26 K02
27 K03
28 COM0
29 COM1
30 COM2
31 COM3
32-33
SEG0-SEG1
34 SEG2
35 SEG3
36 SEG4
37-39
SEG5-SEG7
40-51
SEG8-SEG19
52-53 VC1-VC2
54 VC3
I/O
IN Signal similar to K02.
When either G8 line on key matrix is touched, a corresponding signal will be input into
K00.
IN Signal similar to K02.
When either G9 line on key matrix is touched, a corresponding signal will be input into
K01.
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.
IN Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
OUT Common data signal: COM0.
Connected to LCD (Pin No. COM1)
OUT Common data signal: COM1.
Connected to LCD (Pin No. COM2)
OUT Common data signal: COM2.
Connected to LCD (Pin No. COM3)
OUT Terminal not used.
OUT Terminal not used.
OUT Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). The
signals holds "L" level during microwave
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.
OUT Terminal not used.
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.
OUT Terminal not used.
OUT Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.)
SEG 8 (40) .................... SEG 12
SEG 9 (41) .................... SEG 11
SEG 10 (42) .................... SEG 10
SEG 11 (43) .................... SEG 9
SEG 12 (44) .................... SEG 8
SEG 13 (45) .................... SEG 7
IN Power source voltage input terminal.
Standard voltage for LCD.
OUT Terminal not used.
Description
100P
70P
LCD segment LSI signal (Pin No.)
SEG 14 (46) ..................... SEG 6
SEG 15 (47) ..................... SEG 5
SEG 16 (48) ..................... SEG 4
SEG 17 (49) ..................... SEG 3
SEG 18 (50) ..................... SEG 2
SEG 19 (51) ..................... SEG 1
20
H : GND
L (-5V)
16.7 msec.
OFF
H : GND
ON
L : -5V
OFF OFF
H : GND
24 sec.
8 sec.
ON
L : -5V
16.7 msec.
H : GND
During cooking
LCD segment
L : -5V