SHARP R-348C
Manual de Servicio

R-348C

LSI(IZA968DR) The I/O signal of the LSI(IZA968DR) is detailed in the following table. Pin No. 1-2 3-6 Signal VL2-VL1 AN7-AN4 I/O IN IN Description Power source voltage input terminal. Standard voltage for LCD. 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. Terminal not used. Signal coming from touch key. When either G13 line on key matrix is touched, a corresponding signal out of P20 - P27 will be input into AN2. When no key is touched, the signal is held at "H" level. To input signal which communicates the door open/close information to LSI. Door close "H" level signal (0V). Door open "L" level signal (-5V). Input terminal to judge the model. The one of signals P20-P27 will be input into AN0 through one of G1-G8 lines on key matrix. The LSI will judge the model by this signal. Terminal not used. Signal to sound buzzer (2.0 kHz). 0.12 sec. H : GND A: key touch sound. A B: Completion sound. L : -5V 2.4 sec.
H : GND B L : -5V

7 8

P63 AN2

OUT IN

9 10

AN1 AN0

IN IN

11-13 14

P57-P55 CNTR0

OUT OUT

15

P53

OUT

Oven lamp, fan motor and turntable motor driving signal To turn on and off shut off relay (RY1). The 20.0 msec. square waveform voltage is delivered to the RY1 driving circuit and RY2 control circuit.
During cooking

H : GND

L : -5V

16

P52

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.

OFF

H : GND
ON

P-HI
OFF

L : -5V
OFF 24 sec. ON 8 sec.

H : GND L : -5V

P-70

(ON and OFF times for other power level.) 17-18 19-20 21 P51-P50 P47-P46 P45 OUT OUT IN Terminal not used. Terminal not used. Signal similar to AN2. When either G12 line on key matrix is touched, a corresponding signal will be input into P45. Signal similar to AN2. When either G11 line on key matrix is touched, a corresponding signal will be input into P44. Signal similar to AN2. When either G10 line on key matrix is touched, a corresponding signal will be input into P43. Signal synchronized with commercial power source frequency. This is the basic timing for time processing of LSI. H : GND
L : -5V 20.0 msec.

22

P44

IN

23

P43

IN

24

INT0

IN

25 26 27

P41 P40 RESET

IN IN IN

28-29

P71-P70

OUT

Signal similar to AN2. When either G9 line on key matrix is touched, a corresponding signal will be input into P41. Connected to GND through the pull-down resistor R90. Auto clear terminal. Signal is input to reset the LSI to the initial state when power is applied. Temporarily set "L" level the moment power is applied, at this time the LSI is reset. Thereafter set at "H" level. Terminal not used.
15