7
R - 2 2 A T
R-23AM
R - 2 4 A T
cavity, the oven temperature fuse will open at 120˚C,
causing the oven to shut down. The defective temperature
fuse must be replaced with new rated one.
BLOWER MOTOR TEMPERATURE FUSE TF3
This temperature fuse TF3 protects the blower motor
against overheating. If its temperature goes above 120˚C
because the blower motor is stalled or the ventilation
openings 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 BM
The blower motor BM 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 SM
The upper and lower stirrer motors SM drive stirrer anten-
nas to stir the microwave radiation from the upper and
lower waveguides.
OVEN LAMP OL
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.
TROUBLESHOOTING GUIDE
When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks.
Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure
letter which will be found in the “Test Procedure”section.
IMPORTANT: If the oven becomes inoperative because of a blown fuse F2 F6.3A in the 1st latch switch SW1 - monitor
switch SW4 - monitor resisitor R1 circuit, check the 1st latch switch SW1, monitor switch SW4 and monitor
resistor R1 before replacing the fuse F2 F6.3A
