R-2398G. Complete - Sharp Home Appliance Service Manual (repair manual). Page 9

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7
R-2398
BLOWER MOTOR TEMPERATURE FUSE
This temperature fuse protects the blower motor against
overheating. If its temperature goes above 120˚C be-
cause the blower motor is stalled or the ventilation open-
ings are blocked, the contacts of the temperature fuse will
open. The line voltage to the control unit will be cut off and
the operation of the oven will be stopped. The defective
temperature fuse must be replaced with a new one.
OVEN THERMISTOR (1)
The thermistor is a negative temperature coefficient type.
The temperature in the exhaust duct is detected through
the resistance of the thermistor.
If the temperature is high, the control panel will display
“EE7” and the oven will stop to avoid overheating and
catching fire.
If the thermistor is open, the control panel will display
"EE6" and the oven will stop.
OVEN THERMISTOR (2)
This thermistor detects temperature of the oven cavity
bottom plate. The thermistor is a negative temperature
coefficient type. The temperature is detected through the
resistance of the thermistor.
If the temperature is high, the control will display “EE17”
and the oven will stop.
MAGNETRON THERMISTOR
The thermistor is a negative temperature coefficient type.
The air temperature around the upper magnetron is de-
tected through the resistance of the thermistor.
If the temperature is high, the control panel will display
"EE17" and the oven will stop to protect the lower magn-
etron against overheat.
If the oven thermistor (2) and the magnetron thermistor are
open at the same time, the control panel will display
"EE16" and the oven will stop.
BLOWER MOTOR
The blower motor drives a blade which draws external cool
air into the oven. This cool air is directed through the air
vanes surrounding the magnetrons and cools the
magnetrons. This air is channelled through the oven cavity
to remove steam and vapours given off from the heating
foods. It is then exhausted through the exhausting air
vents at the oven cavity.
STIRRER MOTORS
The upper and lower stirrer motors drive stirrer antennas
to stir the microwave radiation from the upper and lower
waveguides.
OVEN LAMP
The oven cavity light illuminates the interior of the oven so
that food being cooked can be examined visually through
the door window without having to open the door. The
oven lamp is on during the cooking cycle and idle condi-
tion.
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