Sharp Carousel R-930CS Servicehandleiding - Pagina 10

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R-930CS

An example of how sensor works:

1. Potatoes at room temperature.

Vapor is emitted very slowly.

2. Heat potatoes. Moisture and

humidity is emitted rapidly.

You can smell the aroma as it

cooks.

3. Sensor detects moisture and

humidity and calculates

cooking time and variable

power.

Cooking Sequence.

1. Touch SENSOR COOK pad.

NOTE: The oven should not be operated on SENSOR

COOK immediately after plugging in the unit. Wait

two minutes before cooking on SENSOR COOK.

2. Select desired Sensor setting.

3. Touch START pad.

The coil of shut-off relay (RY1, RY6) is energized, the

oven lamp and cooling fan motor are turned on, but the

power transformer is not turned on.

4. After about 16 seconds, the cook relay (RY-2) is

energized. The power transformer is turned on,

microwave energy is produced and first stage is started.

The 16 seconds is the cooling time required to remove

any vapor from the oven cavity and sensor.

NOTE: During this first stage, do not open the door or touch

STOP/CLEAR pad.

5. When the sensor detects the vapor emitted from the

food, the display switches over to the remaining cooking

time and the timer counts down to zero. At this time, the

door may be opened to stir food, turn it or season, etc.

6. When the timer reaches zero, an audible signal sounds.

The shut-off relay and cook relay are de-energized and

the power transformer, oven lamp, etc. are turned off.

7. Opening the door or touching the STOP/CLEAR pad, the

time of day will reappear on the display and the oven will

revert to an OFF condition.

COMPU BROIL/ COMPU ROAST/ COMPU BAKE

COMPU BROIL/ ROAST/ BAKE will automatically compute

the oven temperature, microwave power and cooking time for

baking, roasting and broiling. Set the desired program by

touching the COMPU BROIL/ ROAST/ BAKE pad, and number

pad. Enter the weight by touching the Number pads. When the

START pad is touched, the following operations occur:

1. The COOK indicator will light and the Convection Fan

Symbol will rotate.

2. The cooking time will appear on the display and start

counting down to zero. The cooking time is adjusted

automatically according to the weight of the food.

3. The shut-off relays (RY1, RY5 and RY6) are energized,

turning on the oven lamp, turntable motor, cooling fan

motor and convection motor. The power supply voltage

is applied to the heating element.

4. Now, the oven is in the convection cooking mode.

5. When the oven temperature has reached the programmed

6. At the end of the COMPU BROIL/ ROAST/ BAKE cycle,

COMPU DEFROST COOKING

The COMPU DEFROST key is a special function key to

defrost meats and poultry faster and better. COMPU DE-

AH SENSOR

FROST automatically defrosts roast beef, etc.. When the

COMPU DEFROST is selected and the food weight is

entered by using the COMPU DEFROST pad, the oven will

cook according to the special cooking sequence.

FIRE SENSING FEATURE (MICROWAVE MODE)

This model incorporates a sensing feature which will stop

the oven's operation if there is a fire in the oven cavity during

microwave cooking. This is accomplished by the LSI repeat-

edly measuring the voltage across the temperature meas-

urement circuit (thermistor) during it's 32-seconds time

base comparing the obtained voltage measurements. If the

most recent voltage measured is 300mV greater than the

previous voltage measured, the LSI judges it as a fire in the

oven cavity and switches off the relays to the power trans-

former, fan motor and convection motor. The LSI also stops

counting down and closes the damper door so that no fresh

air will enter the oven cavity. Please refer to the following

section for a more detailed description.

Operation

Please refer to the timing diagrams below.

1. The thermistor operates within a 32-seconds time base

2. The above procedure is repeated. If the difference between

3. Once the fire sensor feature has shut the unit down, the

convection temperature, the oven goes into the

programmed cooking mode.

the damper is returned to the open position and the oven

will go to the off condition. The cooling fan will remain on

until the oven has cooled.

and it is energized for three (3) seconds and off for 29

seconds.

Two (2) seconds after the thermistor is

energized, the voltage across the temperature

measurement circuit is sampled by the LSI and twenty

one (21) seconds after the thermistor is cut off the LSI

turns on the cooling fan for six (6) seconds.

the first voltage measured (in step 1) and the voltage

measured when the procedure is repeated (step 2) is

greater than 300mV the LSI makes the judgment that there

is a fire in the oven cavity and will switch off the relays to the

power transformer, fan motor and convection motor. The

LSI also stops counting down and closes the damper door

so that no fresh air will enter the oven cavity.

programmed cooking cycle may be resumed by pressing

the "START" pad or the unit may be reset by pressing the

"CLEAR" pad.

0 2

6 sec.

CONVECTION

MOTOR

OFF

3 sec.

THERMISTOR

OFF

Sensing

Voltage

OFF

Sensing the voltage across the temperature measurement circuit.

32 (sec.)

64 (sec.)