Sharp R-203BW, Service Manual

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19
R-203BW
R-209BK
R-220BW
DESCRIPTION OF LSI
LSI(IZA868DR)
The I/O signal of the LSI(IZA868DR) are detailed in the following table.
Pin No. Signal I/O Description
A
B
0.1 sec.
2 sec.
H : GND
L : -5V
H : GND
L : -5V
During cooking
L : -5V
H : GND
16.7 msec.
H : GND
L : -5V
OFF
ON
ON
OFF
OFF
H : GND
L : -5V
P-HI
P-70
24 sec. 8 sec.
1-12
SEG0-SEG11
OUT Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.) LCD (Pin No.) LSI signal (Pin No.) LCD (Pin No.)
SEG 0 (1) .............................. S12 SEG 6 (7) ................................. S6
SEG 1 (2) .............................. S11 SEG 7 (8) ................................. S5
SEG 2 (3) .............................. S10 SEG 8 (9) ................................. S4
SEG 3 (4) ................................ S9 SEG 9 (10) ............................... S3
SEG 4 (5) ................................ S8 SEG 10 (11) ............................. S2
SEG 5 (6) ................................ S7 SEG 11 (12) ............................. S1
13 R60 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.
14 R61 IN Signal similar to R60.
When either G9 line on key matrix is touched, a corresponding signal will be input into
R60.
15 R62 IN Signal similar to R60.
When either G8 line on key matrix is touched, a corresponding signal will be input into
R60.
16 R63 IN Signal similar to R60.
When either G7 line on key matrix is touched, a corresponding signal will be input into
R60.
17 AIN0 IN To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door open "L" level (-5V).
18-20 AIN1-AIN3 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.
21 VSS IN Power source voltage: -5V.
VSS voltage of power source circuit input.
22 R70 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.
23 PULSE OUT Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
24 R72 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.
25 R73 OUT Terminal not used.