Sharp R-9H58 Service Manual download pdf (Page 8)

R-9H58

MICROWAVE

2. Heat potatoes. Moisture and humidity is emitted rapidly.

You can smell the aroma as it cooks. ;

MICROWAVE

AH SENSOR

3. Sensor detects moisture and humidity and calculates

cooking time and variable power.

AH SENSOR COOKING SEQUENCE

1. In case the AH sensor cooking condition is started, the

coil of shut-off relays (RY1+RY6) are energized, the

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

power transformer is not turned on.

NOTE: The oven should not be operated on AH SENSOR

COOKING immediately after plugging in the unit.

Wait five minutes before cooking on AH SENSOR

COOKING CONDITION.

2. After about 16 seconds, the cook relay (RY2) 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 vapour from the oven cavity and sensor.

(Figure O-2)

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

touch STOP/CLEAR pad.

3. The oven will go to the Mix Cooking Condition at the

2nd. or 3rd. stage when Reheat pie, Casseroles or

Desserts has been chosen. (Figure O-4)

4. When the sensor detects the vapour 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.

NOTE: In case where a small quantity of food is cooked,

the oven will stop without displaying the remaining

cooking time.

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

The shut-off relay (RY1+RY6) and cook relay (RY2)

are de-energized and the power transformer, oven

lamp, etc. are turned off.

6. 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.

MULTI COOK

MULTI COOK will automatically compute the oven tem-

perature, microwave power and cooking time for baking

and roasting. Set the desired program by touching the

MULTI COOK 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 Microwave

Symbol and/or 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, RY3, RY5 and RY6) are

energized, turning on the oven lamp, turntable motor,

cooling fan motor and convection motor. The power

supply voltage is added to the convection heater.

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

5. When the oven temperature has reached the

programmed convection temperature, the oven goes

into the programmed cooking mode.

6. At the end of the MULTI COOK cycle, 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.

EASY DEFROST COOKING

The EASY DEFROST key is a special function key to

defrost meats and poultry faster and better.

EASY DEFROST key has 4 defrost stages.

EASY DEFROST automatically defrosts roast beef, etc.

When EASY DEFROST is selected and the food weight is

entered by using the number pads, the oven will cook

according to the special cooking sequence. (Figure O-2)

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 accomplished by the LSI repeatedly measures the

voltage across the temperature measurement circuit (ther-

mistor) during it's 32-seconds time base comparing the

obtained voltage measurements. If the most recent volt-

age measured is 300mV grater than the previous voltage

measured, the LSI judges it as a fire in the oven cavity and

switches 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. 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

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.

2. The above procedure is repeated. If the difference

between 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.

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

programmed cooking cycle may be resumed by

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

pressing the "CLEAR" pad.

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Sharp R-9H58 Service Manual Page 8

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