Sharp R-212 Service Manual download pdf (Page 18)

R-212B

Pin No. Signal I/O Description

ON/OFF time ratio in Mi-

cro cooking

(a. 32second time base)

MICRO ON OFF

COOK

100% 32sec. 0sec.

70% 24sec. 8sec.

50% 18sec. 14sec.

30% 12sec. 20sec.

10% 6sec. 26sec.

20 msec

H : GND

L (-5V)

H: GND

L: -5V

2.4 sec

20 msec

During cooking

23 D6 OUT Magnetron high-voltage circuit driving signal.

To turn on and off the cook relay (RY2). In

100% POWER operation, the signals hold

"L" level during microwave cooking and

"H" level while not cooking. In other cook-

ing modes (70%, 50%, 30%, 10%) the

signal turns to "H" level and "L" level in

repetition according to the power level.

24 D7 IN/OUT Terminal not used.

25 D8 OUT Oven lamp, turntable motor and fan motor driving signal(Square Waveform

: 50Hz).

To turn on and off shut-off relay

(RY1). The square waveform volt-

age is delivered to the relay (RY1)

driving circuit and relay(RY2) con-

trol circuit.

26 NC No connection terminal.

27 F0 IN Input signal which communicates the door open/close information to LSI.

Door closed; "H" level signal.

Door opened; "L" level signal.

28 F1 Terminal not used.

29 F2 IN Signal to synchronize LSI with commercial power source frequency.

This is basic timing for all real time process-

ing of LSI.

30 F3 IN Signal coming from encoder.

Signal similar to INT. Pulse signals are input into F3.

31-32 NC No connection terminal.

33 XOUT OUT Internal clock oscillation frequency control output.

Output to control oscillation input of XOUT.

34 XIN IN Internal clock oscillation frequency input setting.

The internal clock frequency is set by inserting the ceramic filter oscillation circuit

with respect to XIN terminal.

35 CNTR OUT Signal to sound buzzer.

A: Completion sound.

36 VDD IN Power source voltage: 0V.

The power source voltage to drive the LSI is input to VDD terminal.

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 35 36

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Sharp R-212 Service Manual Page 18

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