R-774M (serv.man2). Part 1 Text (1-30) - Sharp Home Appliance Service Manual (repair manual). Page 8

R-774M - 8

generated by magnetron.

5. Now, the food is cooked by microwave and top grill

simultaneously.

Programme the desired cooking time by touching the
TIME keys. Touch the DUAL GRILL three twice. Select the
microwave power level by touching the MICROWAVE
POWER LEVEL key. When the STARTkey is touched, the
following operations occur:

1. The numbers on the digital readout start the count

down to zero.

2. The oven lamp, cooling fan motor and turntable motor

are energized.

3. The relay RY4 is energized and the mains supply

voltage is applied to the bottom grill heating element.

4. The relay RY2 is energized and microwave energy is

generated by magnetron.

5. Now, the food is cooked by microwave and bottom grill

simultaneously.

Following table shows each power setting of the top
heating element, bottom heating element, magnetron and
fan motor on Oven cooking mode and Oven preheating
mode.

In grill cooking, oven cooking or dual cooking, the top
heater, bottom heater or magnetron operate whithin a 48
second time base. The following table is the ON / OFF time
ratio at each power output of the top heaters, bottom
heater or magnetron.

POWER OUTPUT

ON TIME

OFF TIME

100%

48 sec.

0 sec.

90%

44 sec.

4 sec.

80%

40 sec.

8 sec.

70%

36 sec.

12 sec.

60%

32 sec.

16 sec.

50%

26 sec.

22 sec.

40%

22 sec.

26 sec.

30%

16 sec.

32 sec.

20%

12 sec.

36 sec.

10%

8 sec.

40 sec.

200˚C

100%

100%

100%

100%

100%

100%

180˚C

100%

100%

100%

100%

100%

100%

160˚C

100%

100%

100%

100%

100%

100%

130˚C

100%

100%

100%

100%

100%

100%

100˚C

100%

100%

100%

100%

100%

100%

70˚C

100%

100%

100%

100%

100%

100%

40˚C

100%

100%

100%

100%

100%

100%

NOTE:
1. In case of Automatic operations, the limitations of

power output are not carried out.

2. In case that the stop key is touched or the oven door is

opened during cooking, the limitations of power output
are not carried out after the total cooking time beyond
the specified cooking time.

3. In case of the two or more same cooking modes  are

carried out,  the limitations of power output are not
carried out after the total cooking time beyond the
specified cooking time.

4. In case of the two or more different cooking modes  are

carried out,  the specified cooking time is started to
count from the point when the cooking mode is changed.

5. If the cooking mode has the power level display, the

power level is also displayed when the limitations of
power output are carried out.

Specified cooking

Limited power

Time base

Cooking mode

time (minutes)

output (%)

(seconds)

Microwave (100%)

20

70

32

Top grill

30

50

48

Bottom grill

45

50

48

Top grill and

15 (Top)

50

48

Bottom grill

15(Bottom)

50

48

Micro. (100%)

20 (Micro.)

70

48

+ Top grill

15 (Grill)

50

48

Micro. (100%)

20 (Micro.)

70

48

+ Bottom grill

15 (Heater)

50

48

D

U

A

L

CHILLED READY MEALS
FROZEN READY MEALS
CHICKEN QUARTERS
CRISPY CRUMB FOODS
OVEN CHIPS
BAKED POTATOES
Above functions are automatic cooking. They automati-
cally work out the correct cooking mode and cooking time
and/or cooking temperature. They will cook according to
the special cooking sequence.

After the same cooking mode is carried out for more than
the specified cooking time, the power output is automati-
cally reduced by turning the control relays on and off
intermittently, as shown in the table below. This is to
protect the oven door against temperature rising.