Sharp R930AK Service Manual - Page 25

R-930AK R-930AW Pin No. Signal 17 P51 I/O OUT 18 P50 OUT 19 P47 OUT 20-21 22 P46-P45 P44 OUT OUT 23 P43 OUT 24 P42 OUT 25 INT1 IN 26 P40 IN 27 RST IN 28/29 XCIN/XCOUT OUT 30 XIN IN 31 XOUT OUT 32 VSS IN 33 P27 IN Description Magnetron high-voltage circuit driving signal. To turn on and off the cook relay(RY2). In P-HI operation, the signals holds "L" level during microwave cooking and "H" level while not cooking. In other cooking modes (P-90, P-80, P-70, P-60, P-60, P-50, P-40, P-30, P-20, P-10, P-0) the signal turns to "H" level and "L" level in repetition according to the power level. VARI MODE P-HI (100% power) P-90 (approx. 90% power) P-80 (approx. 80% power) P-70 (approx. 70% power) P-60 (approx. 60% power) P-50 (approx. 50% power) P-40 (approx. 40% power) P-30 (approx. 30% power) P-20 (approx. 20% power) P-10 (approx. 10% power) P-0 (0% power) ON TIME 32 sec. 30 sec. 26 sec. 24 sec. 22 sec. 18 sec. 16 sec. 12 sec. 8 sec. 6 sec. 0 sec. OFF TIME 0 sec. 2 sec. 6 sec. 8 sec. 10 sec. 14 sec. 16 sec. 20 sec. 24 sec. 26 sec. 32 sec. Damper motor relay driving signal. To turn on and off shut-off relay(RY4). OFF H : GND ON L Heating element driving signal. To turn on and off shut-off relay(RY3). "L" level during convection cooking; "H" level otherwise. During convection cooking, the signal becomes "H" level when the temperature of the oven cavity exceeds the predetermined temperature. During cooking (Convection) ON OFF H. GND L Terminal not used. Timing signal output terminal for temperature measurement(OVEN THERMISTOR). "H" level (GND) : Thermistor OPEN timing. "L" level (-5V) : Temperature measuring timing.(Convection cooking) Signal to sound buzzer. 0.1 sec A: key touch sound. B: Completion sound. C: When the temperature of the oven cavity reaches the preset temperature in the preheating mode, or when the preheating hold time (30 minutes) is elapsed. A 2.0 sec B 1.0 sec C 1.0 sec H: GND L Timing signal output terminal for temperature measurement(OVEN). "H" level (GND) : Ttermistor OPEN timing. "L" level (-5V) : Temperature measuring timing.(Convection cooking) Signal to synchronize LSI with commercial power source freqency. This is the basic timing for all real time processing of LSI. H : GND L (-5V) 16.7 msec. Connected to GND. Auto clear terminal. Signal is input to reset the LSI to the initial state when power is applied. Temporarily set to "L" level the moment power is applied, at this time the LSI is reset. Thereafter set at "H" level. Terminal not used. Internal clock oscillation frequency setting input. The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to XOUT terminal. Internal clock oscillation frequency control output. Output to control oscillation input of XIN. Power source voltage: -5V. VC voltage of power source circuit input. Signal coming from touch key. When any one of G-1 line keys on key matrix is touched, a corresponding signal from P17 - P17 will be input into P27. When no key is touched, the signal is held at "L" level. 23