Sharp R-84ST Service Manual page 10

CONVECTION COOKING CONDITION (Figure O-4)
When the preheat temperature is reached, a beep signal will
sound indicating that the holding temperature has been reached
in the oven cavity. Open the door and place the food to be
cooked in the oven. Program desired cooking time and convec-
tion temperature by touching the ˚C key, and using the 'TIME
keys' to set the time. When the START key is touched, the
following operations occur:
1. The numbers of the digital readout start the count down to
zero.
2. The oven lamp, cooling fan motor, turntable motor and
convection motor are energized.
3. Relays RY3 and RY4 are energized (if the cavity
temperature is lower than the selected temperature) and
the main supply voltage is applied to the top and bottom
heaters to return to the selected cooking temperature.
4. Upon completion of the cooking time, the audible signal
will sound, and oven lamp, turntable motor, cooling fan
motor and convection motor are de-energized. At the end
of convection cycle, if the cavity air temperature is above
104˚C, the circuit to RY6 will be maintained (by the
thermistor circuit) to continue operation of the cooling fan
motor until temperature drops below 104˚C, at that time
the relay will be de-energized, turning off the fan motor .
GRILL COOKING CONDITION
TOP GRILL (Figure O-3a)
In this condition the food is cooked by grill heating element
energy. Programme the desired cooking time and top grill mode
by pressing the 'GRILL MODE' key once, and the 'TIME' keys
to set the time. When the START key 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 RY3 is energized and the main supply voltage is
applied to the top grill heater.
4. Now the food is cooked by the top grill heater.
GRILL COOKING CONDITION
BOTTOM GRILL (Figure O-3b)
In this condition the food is cooked by bottom grill heating
element energy. Program the desired cooking time and
bottom grill mode by pressing the 'GRILL MODE' key twice,
and the'TIME' keys to set the time. When the START key 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 heater.
4. Now the food is cooked by the bottom grill heater.
GRILL COOKING CONDITION
TOP AND BOTTOM GRILL (Figure O-3c)
In this condition the food is cooked by the top and bottom grill
heating element energy. Program the desired cooking time
and top+bottom grill mode by pressing the 'GRILL MODE' key
3 times, and the 'TIME' keys to set the time . When the START
key 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.
OPERATION SEQUENCE
3. The relay RY4 is energized and the main supply voltage is
applied to the bottom grill heater.
4. The relay RY3 is energized and the main supply voltage is
applied to the top grill heater.
5. Now the food is cooked by the bottom grill heater.
DUAL COOKING CONDITION
MICROWAVE AND CONVECTION (Figure O-5a)
Programme the desired cooking time by touching the TIME
keys. Touch the DUAL key once. Select the microwave
power level by touching the MICROWAVE POWER LEVEL
key. And select the convection temperature by touching the
CONVECTION key.
NOTE: The microwave power level can be selected from
When the STARTkey 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, 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 heatier.
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 elementer.
5. The relay RY2 is energized and the microwave energy is
generated by the 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 TIME
keys. Touch the DUAL key twice. Select the microwave
power level by touching the MICROWAVE POWER LEVEL
key. When the STARTkey is touched, the following opera-
tions 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 RY3 is energized and the main supply voltage
is applied to the top grill heating element.
4. The relay RY2 is energized and the microwave energy is
generated by the magnetron.
5. Now, the food is cooked by microwave and top grill
simultaneously.
MICROWAVE AND BOTTOM GRILL (Figure O-5c)
Programme the desired cooking time by touching the TIME
keys. Touch the DUAL three times. Select the microwave
power level by touching the MICROWAVE POWER LEVEL
key. When the STARTkey is touched, the following opera-
tions 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 the magnetron.
5. Now, the food is cooked by microwave and bottom grill
simultaneously.
R-84ST -
10
90W, 270W and 450W.