Sharp R-239 Service Manual page 19

Pin No. Signal I/O
25 COM3 OUT Terminal not used.
26-37 SEG0-SEG11 OUT
38-40 SEG12-SEG14 OUT
41 P70 OUT
42 P71 OUT
43 P72 OUT
44 AVDD IN
45-48 AIN5-AIN2 IN
49-50 AIN1-AIN0 IN
51 AVSS IN
52 P11 IN
53 P10 OUT
54 P33 OUT
55 P32 IN
56 P31 IN
57 INTP0 IN
58 P26 OUT
59 P25 OUT
60 P24 OUT
61 P23 OUT
62 P22 OUT
63 BZO90 OUT
64 P20 OUT
Segment data signal.
Connected to LCD.The relation between signals are as follows:
LSI signal (Pin No.) LCD (segment)
SEG 0 (26) ----------------- S 1
SEG 1 (27) ----------------- S 2
SEG 2 (28) ----------------- S 3
SEG 3 (29) ----------------- S 4
SEG 4 (30) ----------------- S 5
SEG 5 (31) ----------------- S 6
Terminal not used.
Oven lamp, fan motor and turntable motor driving signal
To turn on and off shut off relay (RY1). The square wave-
form voltage is delivered to the RY1 driving circuit and
RY2 control circuit.
Terminal not used.
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.
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI. Connected to GND.
Terminal to change cooking input according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model in operation is
applied to set up its cooking constant.
This is the terminal to detect the voltage of the signal coming from the touch key.
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI.
To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door open "L" level signal (-5V)
Terminal not used.
Switch unit strobe signal.
Signal applied to switch unit section. A pulse signal is input to P50 and P52 terminal while one of H8 line button
on switch unit matrix is touched.
Signal coming from encoder (SW100).
When the encoder is turned, the contacts of encoder make pulse signals. And pulse signals are input into P32.
Signal coming from encoder.
Signal similar to P32. Pulse signals are input into P31.
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
Terminal not used.
Switch unit strobe signal.
Signal applied to switch unit section. A pulse signal is input to P50 and P52 terminal while one of H7 line button
on switch unit matrix is touched.
Terminal not used.
Terminal not used.
Terminal not used.
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
Terminal not used.
Description
LSI signal (Pin No.)
SEG 6 (32) ----------------- S 7
SEG 7 (33) ----------------- S 8
SEG 8 (34) ----------------- S 9
SEG 9 (35) ----------------- S10
SEG 10 (36) ---------------- S11
SEG 11 (37) ---------------- S12
Maximum
output
70% of maximum
output
9 – 2
R239(W)
LCD (segment)
20 msec.
During cooking
OFF
H : GND
ON
L : -5V
OFF OFF
H : GND
24 sec.
8 sec.
ON
L : -5V
20 msec.
0.1 sec.
A
2.0 sec.
B
H : GND
L : -5V
H : GND
L : -5V
H : GND
L : -5V
H : GND
L : -5V