Sharp R-450C, Service Manual

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16
R-450C
23 P24 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.
24 P25 OUT Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). The
signals holds "L" level during microwave cook-
ing 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.
(ON and OFF times for other power level.)
25-26 P26-P27 OUT Terminal not used.
27-34 P30-P37 OUT Terminal not used.
35 CVCC IN Connected to GND.
36 VSS IN Power source voltage: -5.0V.
The power source voltage to the LSI is input to VSS terminal. Connected to VC.
37-38 V3-V2 IN Terminal not used.
39-40 V1-V0 IN
Power source voltage input terminal.
Standard voltage for LCD. Connected to GND.
41 VCC IN Power source voltage: GND (0V).
The power source voltage to drive the LSI is input to VCC terminal.
42-45
COM4-COM1
OUT Terminal not used.
46-65
SEG1-SEG20
OUT Terminal not used.
66-79 P74-P91 OUT Data output terminal to LCD driver IC3.
80-85
SEG35-SEG40
OUT Terminal not used.
86 P40 OUT Terminal not used.
87 P41 IN Signal similar to AN10.
When either G13 line on key matrix is touched, a corresponding signal will be input into P41.
88 P42 IN Signal similar to AN10.
When either G12 line on key matrix is touched, a corresponding signal will be input into P42.
89 IRQ0 IN Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
90 AVCC IN A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI. Connected to GND.
91-92 AN0-AN1 IN Connected to GND through resistor.
93 AN2 IN To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door open "L" level signal (-5V).
94 AN3 IN Connected to VC through resistor.
95-98 AN4-AN7 IN 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.
99 AN8 IN Input terminal to judge the model.
The signal out of P17 will be input into AN8 through G1 line on key matrix. The LSI will judge
the model by this signal.
100 AN9 IN Signal similar to AN10.
When either G11 line on key matrix is touched, a corresponding signal will be input into AN9.
Pin No. Signal I/O Description
20.0 msec.
During cooking
H : GND
L : -5V
P-HI
H : GND
L : -5V
H : GND
L : -5V
P-70
ON
ON
OFF
OFF OFF
24 sec.
8 sec.
20.0 msec.
H : GND
L : -5V