R-770AM - Sharp Home Appliance Service Manual (repair manual). Page 5

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4
770AM -
MICROWAVE COOKING CONDITION
100% (HIGH) COOKING
70% (MEDIUM HIGH), 50% (MEDIUM),
30% (MEDIUM LOW), 10% (LOW COOKING)
The following levels of microwave power are given.
SETTING
100%
32 sec. ON
Approx. 100%
70%
24 sec. ON
8 sec. OFF
Approx. 70%
50%
18 sec. ON
14 sec. OFF
Approx. 50%
30%
12 sec. ON
20 sec. OFF
Approx. 30%
10%
6 sec. ON
26 sec. OFF
Approx. 10%
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.
DUAL COOKING CONDITION
Power level
ON time
OFF time
100%
48 sec.
0 sec.
70%
36 sec.
12 sec
50%
26 sec.
22 sec.
30%
16 sec.
32 sec
10%
8 sec.
40 sec
Power level 0% can not be programmed in Dual Cooking
condition.
LIMITATIONS OF POWER OUTPUT IN MANUAL
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.
Specified cooking
Limited power
Time base
Cooking mode
time (minutes)
output (%)
(seconds)
Microwave
20
70
32
Top grill
30
50
48
Bottom heater
45
50
48
Top grill and Bottom
15 (Top)
50
48
heater or Oven cooking
15 (Bottom)
50
48
Micro. + Top
20 (Micro.)
70
48
grill heater
15 (Grill)
50
48
Microwave +
20 (Micro.)
70
48
bottom heater
15 (Heater)
50
48
NOTE:
1. In case of Automatic operations, the limitations of
power output are not carried out.
2. In case that the stop key is pressed or the oven door is
opened during cooking, the limitations of power output
are 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 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.
OPERATION SEQUENCE
D
U
A
L
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