R-895M (serv.man5). Operation sequence and function of important components - Sharp Home Appliance Service Manual (repair manual). Page 2

R-895M - 7

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 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 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 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 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
STARTkey 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  and RY4 are energized by

control unit and the main supply voltage is added to the
top and bottom heating elements.

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.

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 shut-down completely
after 30 minutes.

CONVECTION COOKING (Figure O-4)
When the pre-heat 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 by touching the TIME keys and program

convection temperature by touching the CONVECTION
TEMPERATURE key . 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, 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
convection cycle, if the cavity air temperature rises
above 120˚C, the circuit to the relay RY6 will be main-
tained (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.
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 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 CONVECTION/GRILL key
twice. Select the microwave power level by touching the
MICROWAVE POWER LEVEL key. 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 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 magnetron.

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

simultaneously.