Read Sharp R-772M (serv.man2) Service Manual online
7
down to zero.
2. The oven lamp, cooling fan motor and turntable motor
are energized.
3. The relay RY4 is energized and the main supply
voltage is applied to the bottom grill heating element.
4. The relay RY2 is energized and the microwave energy
is generated by magnetron.
5. Now, the food is cooked by microwave and bottom grill
simultaneously.
POWER SETTING
The power setting of the top heating element, bottom
heating element and fan motor in the Oven cooking mode
and Oven preheating mode is 100%.
heating element and fan motor in the Oven cooking mode
and Oven preheating mode is 100%.
ON/OFF TIME RATIO
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.
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.
NOTE:
1. In case of Automatic operations, the limitations of
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.
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.
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.
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.
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
AUTOMATIC COOKING
PIZZA
BREAKFAST
INSTANT COOK
AUTO COOK
AUTO DEFROST
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.
BREAKFAST
INSTANT COOK
AUTO COOK
AUTO DEFROST
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.
LIMITATIONS OF POWER OUTPUT IN MANUAL
OPERATION
OPERATION
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.
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.
OPERATION SEQUENCE
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