Read Sharp R-246 (serv.man2) Service Manual online
14
R-246(G)
R-246(SL)
R-246(W)
R-246(SL)
R-246(W)
Pin No.
Signal
I/O
Description
24
K00
IN
Signal similar to K02.
When either G8 line on key matrix is touched, a corresponding signal will be input
into K00.
When either G8 line on key matrix is touched, a corresponding signal will be input
into K00.
25
K01
IN
Signal similar to K02.
When either G9 line on key matrix is touched, a corresponding signal will be input
into K01.
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.
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.
processing of LSI.
28
COM0
OUT
Common data signal.
Connected to LCD (Pin No. C1)
Connected to LCD (Pin No. C1)
29
COM1
OUT
Common data signal.
Connected to LCD (Pin No. C2)
Connected to LCD (Pin No. C2)
30
COM2
OUT
Common data signal.
Connected to LCD (Pin No. C3)
Connected to LCD (Pin No. C3)
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
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.
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.
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.
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:
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) .......................... S12
SEG 14 (46) ............................ S6
SEG 9 (41) .......................... S11
SEG 15 (47) ............................ S5
SEG 10 (42) .......................... S10
SEG 16 (48) ............................ S4
SEG 11 (43) ............................ S9
SEG 17 (49) ............................ S3
SEG 12 (44) ............................ S8
SEG 18 (50) ............................ S2
SEG 13 (45) ............................ S7
SEG 19 (51) ............................ S1
52-53
VC1-VC2
IN
Power source voltage input terminal.
Standard voltage for LCD.
Standard voltage for LCD.
54
VC3
OUT
Terminal not used.
H : GND
L : -5V
OFF
ON
ON
OFF
OFF
H : GND
L : -5V
100P
70P
24 sec.
8 sec.
During cooking
L : -5V
H : GND
20.0 msec.
GND
-5V
20.0 msec.
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