Cooking Sequence; Oven Schematic-Off Condition - Sharp R-310AK Supplemental Service Manual

cooked without figuring time, power level or quantity. When
the oven senses enough steam from the food, it relays the
information to its microprocessor which will calculate the
remaining cooking time and power level needed for best
results. When the food is cooked, water vapor is developed.
The sensor "senses" the vapor and its resistance increases
gradually. When the resistance reaches the value set ac-
cording to the menu, supplementary cooking is started.
The time of supplementary cooking is determined by experi-
ment with each food category and inputted into the LSI.
An example of how sensor works: (SOUP)
1. Soup at room temperature. Vapor is emitted very slowly.
2. Heat Soup. Moisture and humidity is emitted rapidly. You
can smell the aroma as it cooks.
SENSOR
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
OUTER CASE
SWITCH
120V AC
60 Hz
OUTER CASE
SWITCH
THERMAL
MONITOR THERMAL
CUT-OUT (OVEN)
FUSE CUT-OUT (MG.)
(RY-1)
A3
CONTROL UNIT
TTM
OL FM
TURN-
OVEN
FAN
TABLE
LAMP
MOTOR
MOTOR
SECONDARY
INTERLOCK
SWITCH
Figure O-1. Oven Schematic-Off Condition
3. Sensor detects moisture and humidity and calculates
cooking time and variable power.

Cooking Sequence.

1. Touch one of the INSTANT SENSOR pads.
NOTE: The oven should not be operated on INSTANT
SENSOR immediately after plugging in the unit.
Wait five minutes before cooking on INSTANT
SENSOR.
2. The coil of shut-off relay (RY-1) is energized, the turntable
motor, oven lamp and cooling fan motor are turned on,
but the power transformer is not turned on.
3. 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.
4. 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, turn, or
season food.
5. 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.
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.
This Circuit is only for R-330AK and R-330AW.
These outer case switches will be used from Oct.
1996 production.
COM.
N.O.
(RY-2)
PRIMARY
INTERLOCK
RELAY
B A
DOOR
SENSING
MONITOR
SWITCH
SWITCH
7
POWER
TRANSFORMER
CAPACITOR
0.94µF
RECTIFIER
MAGNETRON
R-310AK
R-330AK
R-330AW