Oven Schematic - Sharp R-426LS Service Manual

R426LS
AH SENSOR
3. Sensor detects moisture and humidity and calculates cooking time
and variable power.
5.1. Cooking Sequence.
1. Operate the oven in sensor cooking mode by referring to the opera-
tion manual.
NOTE: The oven should not be operated on SENSOR immediately
after plugging in the unit. Wait two minutes before cooking on
SENSOR.

[2] OVEN SCHEMATIC

1. Off Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
H
GRN
C1
GND
120VAC
60Hz
N
C1: LINE CROSS CAPACITOR ------- 0.22uF/ AC250V
C2, C3: LINE BYPASS CAPACITOR ------ 0.033uF/ AC250V
C2
C3
(RY1)
OVEN LAMP
RELAY
NOISE
FILTER
Figure O-1. Oven Schematic-Off Condition
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 dis-
play 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 trans-
former, 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.
NOTE: " " indicates components with potentials above 250V
B2
DOOR
SENSING
SWITCH
B1
(RY2) F-3
SECONDARY
INTERLOCK
RELAY
F-2
CONTROL UNIT
F-1
MONITOR
SWITCH
TURN
OVEN FAN
FM
OL
TTM TABLE
LAMP MOTOR
MOTOR
COM. N.O.
PRIMARY INTERLOCK
SWITCH
6 – 2
POWER TRANSFORMER
HIGH
VOLTAGE
CAPACITOR
0.94uF/ AC2200V
N.C.
HIGH
VOLTAGE
RECTIFIER
COM.