Description Of Lsi - Sharp R-203BW Service Manual

LSI(IZA868DR)
The I/O signal of the LSI(IZA868DR) are detailed in the following table.
Pin No. Signal
1-12
SEG0-SEG11
13 R60
14 R61
15 R62
16 R63
17 AIN0
18-20 AIN1-AIN3
21 VSS
22 R70
23 PULSE
24 R72
25 R73

DESCRIPTION OF LSI

I/O
OUT Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.)
SEG 0 (1) .............................. S12
SEG 1 (2) .............................. S11
SEG 2 (3) .............................. S10
SEG 3 (4) ................................ S9
SEG 4 (5) ................................ S8
SEG 5 (6) ................................ S7
IN Signal coming from touch key.
When either G10 line on key matrix is touched, a corresponding signal out of R81 -
R83 and R90 - R92 will be input into R60. When no key is touched, the signal is held
at "H" level.
IN Signal similar to R60.
When either G9 line on key matrix is touched, a corresponding signal will be input into
R60.
IN Signal similar to R60.
When either G8 line on key matrix is touched, a corresponding signal will be input into
R60.
IN Signal similar to R60.
When either G7 line on key matrix is touched, a corresponding signal will be input into
R60.
IN To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door open "L" level (-5V).
IN Terminal to change functions 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 function.
IN Power source voltage: -5V.
VSS voltage of power source circuit input.
OUT Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2).
The signals holds "L" level during micro-
wave cooking and "H" level while not
cooking. In other cooking modes (vari-
able cooking) the signal turns to "H" level
and "L" level in repetition according to
the power level.
OUT Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
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.
Description
LCD (Pin No.) LSI signal (Pin No.)
SEG 6 (7) ................................. S6
SEG 7 (8) ................................. S5
SEG 8 (9) ................................. S4
SEG 9 (10) ............................... S3
SEG 10 (11) ............................. S2
SEG 11 (12) ............................. S1
P-HI
P-70
19
LCD (Pin No.)
OFF
H : GND
ON
L : -5V
OFF
OFF
H : GND
24 sec. 8 sec.
ON
L : -5V
0.1 sec.
H : GND
A
L : -5V
2 sec.
H : GND
B
L : -5V
16.7 msec.
During cooking
R-203BW
R-209BK
R-220BW
H : GND
L : -5V