Sharp R-410FW Service Manual - Page 21

DESCRIPTION OF LSI LSI The I/O signal of the LSI is detailed in the following table. R-410FK R-410FW Pin No. Signal 1-2 VL2-VL1 I/O Description IN Power source voltage input terminal. Standard voltage for LCD. 3-6 AN7-AN4 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. 7 P63 OUT Terminal not used. 8 AN2 IN Input terminal to judge the model. The one of signals P20 - P27 will be input into AN2 through one of G1 - G8 lines on key matrix. The LSI will judge the model by this signal. 9 AN1 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). 10 AN0 IN Input terminal to judge the model. Connected to GND through the pull-down resistor. 11 P57 OUT Back light circuit (Light emitting diodes) driving signal. 12-13 P56-P55 OUT Terminal not used. 14 CNTR0 OUT Signal to sound buzzer (2.0 kHz). 0.1 sec. A: key touch sound. B: Completion sound. A 2.0 sec. B H : GND L : -5V H : GND L : -5V 15 P53 OUT Oven lamp, fan motor and turntable motor driving signal To turn on and off shut off relay (RY1). The 16.7 msec. square waveform voltage is delivered to the RY1 driving circuit and RY2 control circuit. H : GND During cooking 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 OFF H : GND 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. Maximum output ON OFF 70% of maximum 24 sec. output ON OFF 8 sec. L : -5V H : GND L : -5V 17-18 19 20 21 22-23 24 P51-P50 P47 P46 P45 P44-P43 INT0 OUT IN OUT IN IN IN Terminal not used. Signal coming from touch key. When either G12 line on key matrix is touched, a corresponding signal out of P20 P27 will be input into P47. When no key is touched, the signal is held at "H" level. Terminal not used. Signal similar to P47. When either G11 line on key matrix is touched, a corresponding signal will be input into P45. Terminal not used. Signal synchronized with commercial power source frequency. This is the basic timing for time processing of LSI. H : GND 16.7 msec. L : -5V 25 P41 IN Signal similar to P47. When either G10 line on key matrix is touched, a corresponding signal will be input into P41. 26 P40 IN Connected to GND through the pull-down resistor R90. 19