Theory of Operation
Drawer Microwave
(Models MWD24-2 / MWD30-2)
3-19
#813632 - Revision B - December, 2009
Pin No.
27
28
29 - 31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
COM0
VL3
P27- P25
SEG20
P23
P22
P21
P20
P17
P16
P15
P14
P13
P12
P11
P10
P07
P06
OUT
IN
OUT
OUT
IN
IN
IN
IN
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
Common Data Signal:
Connected to LCD signal C4.
Connected VC (+5V).
Terminal not used.
Segment Data Signal:
Connected to LCD segment S24.
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.
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.
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.
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.
Signal
I/O
Description
ON
OFF
L: GN D
H: +5V
ON
OFF
L: GN D
H: +5V
