R-884 (serv.man3) - Sharp Home Appliance Service Manual (repair manual). Page 7

R-884M - 7

TOP GRILL (Figure O-3a)
In this condition the food is cooked by the top grill heating
element . Programme the desired cooking time by touch-
ing the TIME keys and touch the GRILL key once. When
the START key is touched, the following operations occur:
1. The numbers on the digital read-out start the count

down to zero.

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

are energized.

3. The relay RY3 is energized and the main supply

voltage is applied to the top grill heating element .

4. Now, the food is cooked by the top grill heating ele-

ment.

BOTTOM GRILL (Figure O-3b)
In this condition the food is cooked by bottom grill heating
element energy. Programme the desired cooking time by
touching the TIME keys and touch the GRILL key twice.
When the START key is touched, the following operations
occur:
1. The numbers on the digital read-out 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. Now, the food is cooked by the bottom grill heating

element .

TOP AND BOTTOM GRILL (Figure O-3c)
In this condition the food is cooked by top and bottom grill
heating elements energy. Programme the desired cook-
ing time by touching the TIME keys and touch the GRILL
key three times. When the START key is touched, the
following operations occur:
1. The numbers on the digital read-out 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 RY3 is energized and the main supply

voltage is applied to the top grill heating element.

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

heating elements.

PRE-HEATING (Figure O-4)
Programme the desired convection temperature by touch-
ing CONVECTION TEMPERATURE key. When the
START key is touched, the following operations occur:
1. The coil shut-off relays RY1  and RY6 are energized,

the oven lamp, cooling fan motor and turntable motor
are turned on.

2. The coil shut-off relays RY3  RY 7 and RY4 are

energized by control unit and the main supply voltage
is added to the top and bottom heating elements and
convection motor.

3. When the oven temperature reaches the selected pre-

heat temperature,  the following operations occur:

3-1. The coil shut-off relays RY3  and RY4 are energized

by control unit temperature circuit and thermistor,
opening the circuit to the top and bottom grill heating
elements and convection motor.

3-2. The oven will continue to function for 30 minutes,

turning the top and bottom heating elements on and
off, as needed to maintain the selected pre-heat
temperature. The oven will shutdown completely af-
ter 30 minutes.

NOTE: The fan motor will be turned on and off at

preheating. And the convection motor will be turned
off at  preheating. See "Power setting" on page 9.

CONVECTION COOKING (Figure O-4)
When the pre-heat temperature is reached, a beep signal
will sound indicating that the holding the temperature has
been reached in the oven cavity. Open the door and place
the food to cooked in the oven. Program desired cooking
time by touching the TIME keys and program convection
temperature by touching the CONVECTION TEMPERA-
TURE key . When the START key is touched, the following
operations occur:
1. The numbers on the digital read-out start the count

down to zero.

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

convection motor are energized.

NOTE: When the convection temperature 40˚C is se-

lected, the convection motor is not energized.

3. The relays RY3  and RY4 are energized (if the cavity

temperature is lower than selected temperature) and
the main supply voltage is applied to the top and
bottom heating elements to return to the selected
cooking temperature.

4. Upon completion of the cooking time, the audible sig-

nal will sound, and the oven lamp, turntable motor,
cooling fan motor, convection motor, top and bottom
heating elements are de-energized. At the end of con-
vection cycle, if the cavity air temperature rise above
120˚C, the circuit to the relay RY6 will be maintained
(by the thermistor circuit) to continue operation of the
cooling fan motor until temperature drops below 105˚C,
at that time the relay RY6 will be de-energized, turning
off the fan motor.

MICROWAVE AND CONVECTION  (Figure O-5a)
Programme the desired cooking time by touching the
TIME keys. Touch the DUAL CONVECTION/GRILL key
once. Select the microwave power level by touching the
MICROWAVE POWER LEVEL key. And select the con-
vection temperature by touching the CONVECTION TEM-
PERATURE key.

NOTE: The microwave power level can be selected from

90W, 270W and 450W.

When the START key is touched, the following operations
occur:
1. The numbers on the digital read-out start the count

down to zero.

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

convection motor are energized.

3. The relay RY3 will be energized and the main supply

voltage is applied to the top grill heater.

4. The relay RY4 is energized (if the cavity temperature is

lower than selected temperature) and the main supply
voltage is applied to the bottom heating element.

5. The relay RY2 is energized and the microwave energy

is generated by magnetron.

6. Now, the food is cooked by microwave and convection

energy simultaneously.

MICROWAVE AND TOP GRILL  (Figure O-5b)
Programme the desired cooking time by touching the