On/Off Time Ratio; Auto Power Control Operation - Sharp R-890SLM Service Manual

3. MICROWAVE AND BOTTOM GRILL (Figure O-5c)
Press MIX button 3 times. And enter the desired cooking time
by rotating the ENCODER dial. And press MICRO POWER
button to set the desired microwave power. When the INSTANT
COOK/START button 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 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 simul-
taneously.

[7] AUTO POWER CONTROL OPERATION

The magnetron, top or bottom heating elements, the fan motor or the convection motor will operate in accordance with following
specification.
1. OUTPUT POWER CONTROL (MANUAL COOK)
OPERATION MODE
MICROWAVE (100%)
SINGLE OPERATION
TOP GRILL (100%)
SINGLE OPERATION
BOTTOM GRILL (100%)
SINGLE OPERATION
TOP(100%)/BOTTOM(100%)
COMBI OPERATION
MICRO(100%)/TOP GRILL(100%)
COMBI OPERATION
MICRO(70 - 10%)/TOP GRILL(100%)
COMBI OPERATION
MICRO(100%)/BOTTOM GRILL(100%)
COMBI OPERATION
MICRO(70 - 10%)/BOTTOM GRILL(100%)
COMBI OPERATION
Repeat Cook
2. OUTPUT POWER CONTROL (AUTO COOK)
OPERATION MODE
Repeat Auto Cook
Service_R-890SLM.indd 9

[6] ON/OFF TIME RATIO

In grill cooking, convection cooking or combi cooking, the top
heater, bottom heater or magnetron operate within a 54 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
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
DEVICE
Microwave 100% 20min, then 70%
Top heater 100% 15min, then 50%
Bottom heater 100% 15min, then 50%
Top heater 100% 6min then 70% and 70% 9min then 50%
Bottom heater 100% 6min then 70% and 70% 9min then 50%
Microwave 100% 20min, then 70%
Top heater 100% 15min, then 50%
Microwave -
Top heater 100% 15min, then 50%
Microwave 100% 20min, then 70%
Bottom heater 100% 15min, then 50%
Microwave -
Bottom heater 100% 15min, then 50%
Microwave In case same cooking mode is repeated within 1min 15sec
Top heater (including stop, end), oven calculates total cooking time and
Bottom heater reduce the power level.
DEVICE
The power level is not reduced 1 time cooking. But only in
case same menu is repeated within 1min 15sec, the power
level of micro and grill is reduced from 100% to 70% in 20mins
after starting of last cooking. (Even if the time of the last cook-
ing is longer than 20mins, the power level isn't reduced on the
last cooking, and it is reduced from the beginning of the next
Microwave
cooking.) However, in time calculated from the start of the 1st
cooking, even if the Cook mode changed, when repetition
cooking of the menu with which 100% of top & bottom heaters
continues are performed, as shown in the following table, the
power down of the cooking of the 2nd henceforth is carried
out. (The 1st cooking is not applied)
5 - 3
ON TIME OFF TIME
54 sec. 0 sec.
49 sec. 5 sec.
45 sec. 9 sec.
40 sec. 14 sec.
36 sec. 18 sec.
29 sec. 25 sec.
24 sec. 30 sec.
18 sec. 36 sec.
13 sec. 41 sec.
9 sec. 45 sec.
POWER CONTROL
POWER CONTROL
R-890SLM
4/25/09 10:54:57 AM