Sharp Carousel R-395NS 서비스 매뉴얼 - 페이지 7

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CHAPTER 5.

R395N(S)

OPERATION SEQUENCE

[1] OFF CONDITION

Closing the door activates all door interlock switches (1st. latch switch

and 2nd. interlock relay control switch).

MPORTANT

When the oven door is closed, the monitor switch contacts (COM-NC)

must be open. When the microwave oven is plugged in a wall outlet,

rated voltage is supplied to the noise filter and the control unit.

Figure O-1 on page 12-1

1. The display shows flashing "88:88".

2. To set any programmes or set the clock, you must first touch the

STOP/CLEAR pad.

3. "

" appears in the display.

NOTE: When the oven door is opened, the oven lamp comes on at

this time.

[2] MICROWAVE COOKING CONDITION

1. HIGH COOKING

Enter a desired cooking time with the touching NUMBER pad and start

the oven with touching START pad.

Function sequence

Figure O-2 on page 12-1

CONNECTED COMPONENTS

Oven lamp, Fan motor, Turntable motor

Power transformer

1. Rated voltage is supplied to the primary winding of the power trans-

former. The voltage is converted to about 3.3 volts A.C. output on

the filament winding and high voltage of approximately 2000 volts

A.C. on the secondary winding.

2. The filament winding voltage (3.3 volts) heats the magnetron fila-

ment and the high voltage (2000 volts) is sent to the voltage dou-

bling circuit, where it is doubled to negative voltage of

approximately 4000 volts D.C.

3. The 2450 MHz microwave energy produced in the magnetron gen-

erates a wave length of 12.24 cm. This energy is channelled

through the waveguide (transport channel) into the oven cavity,

where the food is placed to be cooked.

4. When the cooking time is up, a signal tone is heard and the relays

(RY1+RY2) go back to their home position. The circuits to the oven

lamp, power transformer, fan motor and turntable motor are cut off.

5. When the door is opened during a cook cycle, the switches come to

the following condition

SWITCH

CONTACT

1st. latch switch

COM-NO

2nd. interlock relay

COM-NO

control switch

Monitor switch

COM-NC

The circuits to the power transformer, fan motor and turntable motor

are cut off when the 1st. latch switch and 2nd. interlock relay control

switch are made open. The oven lamp remains on even if the oven

door is opened after the cooking cycle has been interrupted, because

the relay RY1 stays closed. Shown in the display is the remaining time.

6. MONITOR SWITCH CIRCUIT

The monitor switch is mechanically controlled by oven door, and

monitors the operation of the 1st. latch switch and 2nd. interlock

relay.

RELAY

RY1

RY2

CONDITION

DURING

DOOR OPEN

COOKING

(NO COOKING)

Closed

Open

Closed

Open

Closed

1) When the oven door is opened during or after the cycle of a

cooking program, the 1st. latch switch and 2nd. interlock relay

control switch must open their contacts first. After that the con-

tacts (COM-NC) of the monitor switch can be closed.

2) When the oven door is closed, the contacts (COM-NC) of the

monitor switch must be opened. After that the contacts of the

1st. latch switch and 2nd. interlock relay control switch are

closed.

3) When the oven door is opened and the contacts of the 1st. latch

switch and 2nd. interlock relay remain closed. The fuse F10A

will blow, because the monitor switch is closed and a short cir-

cuit is caused.

2. MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW

COOKING

When the microwave oven is preset for variable cooking power, rated

voltage is supplied to the power transformer intermittently within a 32-

second time base through the relay contact which is coupled with the

current-limiting relay. The following levels of microwave power are

given.

SETTING;

32 sec. ON

100P

24 sec. ON

70P

18 sec. ON

50P

12 sec. ON

30P

6 sec. ON

10P

NOTE: The ON/OFF time ratio does not exactly correspond to the

percentage of microwave power, because approx. 3 seconds

are needed for heating up the magnetron filament.

[3] POWER OUTPUT REDUCTION

After 100% power cooking mode is carried out for more than 40 min-

utes, the power out-put is automatically reduced to 70%.

5 – 1

R395N(S)

100%

8 sec. OFF

Approx. 70%

14 sec. OFF

Approx. 50%

20 sec. OFF

Approx. 30%

26 sec. OFF

Approx. 10%