Sharp R-770B Wartungshandbuch PDF herunterladen (Seite 7)

R-770B

TOP HEATER MODE

In this mode, the food is cooked by the top heaters. Press

the GRILL pad once and then enter the cooking time by

pressing the number pads. When the START pad is

pressed, the following operations occur:

Figure O-3(a) on page 27

1. The relay RY3 + RY5 + RY6 are energized.

2. The numbers of the digital read-out start the count

down to zero.

3. Then the top heaters, turntable motor, oven lamp and

fan motor are energized.

4. Now, the food is grilled by the top heaters.

5. Upon completion of the selected cooking time, audible

signal sounds and the contacts of relays RY3 + RY6

are opened, then the top heaters, turntable motor and

oven lamp are de-energized. But the relay RY5 stays

closed and the fan motor operates for 5 minutes. But if

the cooking time is less than 2 minutes the relay RY5

will not stay close.

BOTTOM HEATER MODE

In this mode, the food is cooked by the bottom heater.

Press the GRILL pad twice and then enter the cooking time

by pressing the number pads. When the START pad is

pressed, the following operations occur:

Figure O-3(b) on page 28

1. The relay RY4 + RY5 + RY6 are energized.

2. The numbers of the digital read-out start the count

down to zero.

3. Then the bottom heater, turntable motor, oven lamp

and fan motor are energized.

4. Now, the food is grilled by the bottom heater.

5. Upon completion of the selected cooking time, audible

signal sounds and the contacts of relays RY4 + RY6

are opened, then the bottom heating elements, turnta-

ble motor and oven lamp are de-energized. But the

relay RY5 stays closed and the fan motor operates for

5 minutes. But if the cooking time is less than 2 minutes

the relay RY5 will not stay close.

TOP AND BOTTOM HEATER MODE

In this mode, the food is cooked by both the top heaters

and bottom heater. Press the GRILL pad three times and

then enter the cooking time by pressing the number pads.

When the START pad is pressed, the following operations

occur:

Figure O-3(c) on page 28

1. The relay RY3 + RY4 + RY5 + RY6 are energized.

2. The numbers of the digital read-out start the count

down to zero.

3. Then the top heaters, bottom heater, turntable motor,

oven lamp and fan motor are energized.

4. Now, the food is grilled by the top heaters and the

bottom heater.

5. Upon completion of the selected cooking time, audible

signal sounds and the contacts of relays RY3 + RY4 +

RY6 are opened, then the top heating elements, bot-

tom heating element, turntable motor and oven lamp

are de-energized. But the relay RY5 stays closed and

the fan motor operates for 5 minutes. But if the cooking

time is less than 2 minutes the relay RY5 will not stay

closed.

GRILL MIX COOKING CONDITION

The oven will cook food by supplying grill heaters (top

heaters or Bottom heater) and microwave energy alter-

nately within a 48 seconds time base. And the oven has

four programmed cooking mode.

GRILL MIX HIGH WITH TOP HEATER MODE AND

GRILL MIX LOW WITH TOP HEATER MODE

In these modes, the food is cooked by the top heaters and

the microwave energy. Press the GRILL MIX pad once for

GRILL MIX HIGH with TOP HEATER mode. Press the

GRILL MIX pad twice for GRILL MIX LOW with TOP

HEATER mode. And then enter the cooking time by

pressing the number pads. When the START pad is

pressed, the following operations occur:

Figure O-4(a) on page 29

1. The relay RY5 + RY6 are energized.

2. The numbers of the digital read-out start the count

down to zero.

3. The turntable motor, oven lamp and fan motor are

energized.

4. The relay RY2 + RY3 are energized alternately within

a 48 seconds time base by the control unit.

5. The top heaters operate through the relay RY3 is

energized. And the high voltage transformer operates

through the relay RY2 is energized.

6. The relationship between the top heating elements and

magnetron operations are as follows.

Note: The On/Off time ratio does not exactly correspond

to the percentage of microwave power, because

approx. 2 seconds are needed for heating up the

magnetron filament.

7. Upon completion of the selected cooking time, audible

signal sounds and the contacts of relays RY2 + RY3 +

RY6 are opened, then the top heaters, high voltage

transformer, turntable motor and oven lamp are de-

energized. But the relay RY5 stays closed and the fan

motor operates for 5 minutes. But if the cooking time is

less than 2 minutes the relay RY5 will not stay close.

GRILL MIX HIGH WITH BOTTOM HEATER MODE AND

GRILL MIX LOW WITH BOTTOM HEATER MODE

IIn these modes, the food is cooked by the bottom heater

and the microwave energy. Press the GRILL MIX pad

three (3) times for GRILL MIX HIGH with BOTTOM

HEATER mode. Press the GRILL MIX pad four (4) times

for GRILL MIXLOW with BOTTOM HEATER mode. And

then enter the cooking time by pressing the number pads.

26 SEC. 22 SEC.

GRILL MIX LOW with TOP HEATER mode

GRILL MIX HIGH with TOP HEATER mode

MICROWAVE POWER

= APPROX. 50%

MICROWAVE POWER

= APPROX. 10%

40 SEC.8 SEC.

OFF

(MICRO.)

TOP

HEATERS

TOP 

HEATERS

1 2 3 4 5 6 7 8 9 10 11 12 ... 39 40

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