R-671M - Sharp Home Appliance Service Manual (repair manual). Page 7

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R-671M  -  7
In this mode, the food is cooked by the grill heating
element (top grill). Enter the cooking time by pressing the
TIME keys and select the TOP GRILL mode by pressing
the GRILL key once. When the START button is pressed,
the following operations occur:
Figure O-3(a) on page 30
1. The relay RY1 + RY3 + RY5 are energized.
2. The numbers of the digital readout start the count down
to zero.
3. Then the grill heating element (top), turntable motor,
oven lamp and fan motor are energized.
4. Now, the food is grilled by the grill heating element.
5. Upon completion of the selected cooking time, audible
signal sounds and the contacts of relays RY1 + RY3
are opened, then the grill heating element (top), turntable
motor and oven lamp are de-energized.
6. The relay RY5 stays closed for five (5) minutes, and the
fan motor operates.
BOTTOM GRILL MODE
In this mode, the food is cooked by the bottom heating
element. Enter the cooking time by pressing the TIME
keys and select the BOTTOM GRILL mode by pressing
the GRILL key twice. When the START key is pressed, the
following operations occur:
Figure O-3(b) on page 31
1. The relay RY1 + RY4 + RY5 are energized.
2. The numbers of the digital readout start the count down
to zero.
3. Then the bottom heating element, turntable motor,
oven lamp and fan motor are energized.
4. Now, the food is grilled by the bottom heating element.
5. Upon completion of the selected cooking time, audible
signal sounds and the contacts of relays RY1 + RY4
are opened, then the bottom heating element, turntable
motor and oven lamp are de-energized.
6. The relay RY5 stays closed for five (5) minutes, and the
fan motor operates.
TOP AND BOTTOM GRILL MODE
In this mode, the food is cooked by both the grill heating
element (top grill) and bottom heating element. Enter the
cooking time by pressing the TIME keys and select the
TOP AND BOTTOM GRILL mode by pressing the GRILL
key three times. When the START key is pressed, the
following operations occur:
Figure O-3(c) on page 31
1. The relay RY1 + RY3 + RY4 + RY5 are energized.
2. The numbers of the digital readout start the count down
to zero.
3. Then the grill heating element (top), bottom heating
element, turntable motor, oven lamp and fan motor are
energized.
4. Now, the food is grilled by the grill heating element (top)
and the bottom heating element.
5. Upon completion of the selected cooking time, audible
signal sounds and the contacts of relays RY1 + RY3 +
RY4 are opened, then the grill heating element (top),
bottom heating element, turntable motor and oven
lamp are de-energized.
6. The relay RY5 stays closed for five (5) minutes, and the
fan motor operates.
DUAL COOKING CONDITION
The oven has two dual cooking mode. One is MICROWAVE
AND TOP GRILL mode and the other one is MICROWAVE
AND BOTTOM  GRILL mode. In both modes, the relay
RY2 operates intermittently with in a 48 seconds time base
as shown below.
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
MICROWAVE AND TOP GRILL MODE
FIGURE 0-4(a) ON PAGE 32
In this mode, the food is cooked by microwave and the grill
heating element (top). Enter the cooking time by pressing
the TIME keys and select the MICROWAVE AND TOP
GRILL mode by pressing the DUAL GRILL cooking key
once. And select the power level by pressing the
MICROWAVE POWER LEVEL key. When the START
key is pressed, the following operations occur(Fig 0-4a):
1. The relay RY1 + RY2 + RY3 + RY5 are energized.
2. The numbers of the digital readout start the count down
to zero.
3. The grill heating element (top), high voltage transformer,
turntable motor, oven lamp and fan motor are energized.
4. Now, the food is cooked by the microwave and grill
heating element (top).
5. Upon completion of the selected cooking time, audible
signal sounds and the contacts of relays RY1 + RY2 +
RY3 are opened, then the grill heating element (top),
high voltage transformer, turntable motor and oven
lamp are de-energized.
6. The relay RY5 stays closed for five (5) minutes, and the
fan motor operates.
MICROWAVE AND BOTTOM GRILL MODE
FIGURE 0-4(b) ON PAGE 32
In this mode, the food is cooked by microwave and the
bottom heating element. Enter the cooking time by pressing
the TIME keys and select the MICROWAVE AND BOTTOM
GRILL mode by pressing the DUAL GRILL cooking key
twice. And select the power level by pressing the
MICROWAVE POWER LEVEL key. When the START
key is pressed, the following operations occur(Fig 0-4b):
1. The relay RY1 + RY2 + RY4 + RY5 are energized.
2. The numbers of the digital readout start the count down
to zero.
3. The bottom heating element, high voltage transformer,
turntable motor, oven lamp and fan motor are energized.
4. Now, the food is cooked by the microwave and bottom
heating element.
5. Upon completion of the selected cooking time, audible
signal sounds and the contacts of relays RY1 + RY2 +
RY4 are opened, then the bottom heating elements,
high voltage transformer, turntable motor and oven
lamp are de-energized.
TOP GRILL MODE
OPERATION SEQUENCE 
CONT
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