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Theory of Operation
Pin No.
Signal
27
COM0
OUT
28
VL3
29 - 31
P27- P25
OUT
32
SEG20
OUT
33
P23
34
P22
35
P21
36
P20
37
P17
OUT
38
P16
OUT
39
P15
OUT
40
P14
OUT
41
P13
OUT
42
P12
OUT
43
P11
OUT
44
P10
OUT
45
P07
OUT
46
P06
OUT
Drawer Microwave
I/O
Common data signal.
Connected to LCD signal C4.
IN
Connected VC (+5V).
Terminal not used.
Segment data signal.
Connected to LCD segment S24.
IN
Signal coming from touch key.
When any one of J-4 line keys on key matrix is touched, a corresponding signal from P10-
P17 will be input into P23. When no key is touched, the signal is held at "L" level.
IN
Signal similar to P23.
When any one of J-3 line keys on key matrix is touched, a corresponding signal will be
input into P22.
IN
Signal similar to P23.
When any one of J-2 line keys on key matrix is touched, a corresponding signal will be
input into P21.
IN
Signal similar to P23.
When any one of J-1 line keys on key matrix is touched, a corresponding signal will be
input into P20.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P20 - P23 terminal while
one of J-12 line key on matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P20 - P23 terminal while
one of J-11 line key on matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P20 - P23 terminal while
one of J-10 line key on matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P20 - P23 terminal while
one of J-9 line key on matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P20 - P23 terminal while
one of J-8 line key on matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P20 - P23 terminal while
one of J-7 line key on matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P20 - P23 terminal while
one of J-6 line key on matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P20 - P23 terminal while
one of J-5 line key on matrix is touched.
Fan motor (Drawer) driving signal.
To turn on and off relay(RY4).
"H" level: During fan motor ON.
"L" level: During fan motor OFF.
Stirrer motor driving signal.
To turn on and off relay(RY3).
"H" level: During fan motor ON.
"L" level: During fan motor OFF.
Description
ON
ON
3-12
H: +5V
L: GND
OFF
H: +5V
L: GND
OFF
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