Sharp R-212 Service Manual download pdf (Page 16)

R-212B

CONTROL PANEL ASSEMBLY

OUTLINE OF CONTROL PANEL

5) Buzzer Circuit

The buzzer is responsive to signals from the LSI to emit

audible sounds (key touch sound and completion

sound).

6) Door Sensing Switch (Stop Switch)

A switch to "tell" the LSI if the door is open or closed.

7) Relay Circuit

To drive the magnetron, fan motor, turntable motor and

light the oven lamp.

8) Encoder

The encoder generates the pulse signal, and the pulse

signal is sent to the LSI.

9) Indicator Circuit

Indicator elements are the Light-emitting diodes (LD1-

LD24).

This circuit consists of 4-digits and 6 segments.

10) Potentiometer Circuit

The circuit makes setting of the power level by variable

resistance.

Control Unit

Control unit consists of LSI, power source circuit, synchro-

nizing signal circuit, ACL circuit, buzzer circuit, encoder

circuit, indicator circuit and potentiometer circuit.

1) LSI

This LSI controls the encoder signal, potentiometer

signal, relay driving signal for oven function, buzzer

signal and LED signal.

2) Power Source Circuit

This circuit generates voltage necessary in the control

unit.

Symbol Voltage Application

VC -5.0V LSI(I-1)

3) Synchronizing Signal Circuit

The power source synchronizing signal is available in

order to compose a basic standard time in the clock

circuit. It accompanies a very small error because it

works on commercial frequency.

4) ACL

A circuit to generate a signals which resets the LSI to

the initial state when power is supplied.

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Sharp R-212 Service Manual Page 16

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