R-22GT-F
R-22GV-F
10
TROUBLESHOOTING GUIDE
Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.
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 monitor fuse, check the monitor switches (1), (2),
primary interlock relays RY2, RY3, door sensing switch and secondary interlock switches (1), (2), before
replacing the monitor fuse. If monitor fuse is replaced, the monitor switch (1) and/or (2) must also be replaced.
Use part FFS-BA033WRKZ as an assembly.
IMPORTANT:
Whenever troubleshooting is performed with the power supply cord disconnected. It may, in some cases,
be necessary to connect the power supply cord after the outer case has been removed, in this event,
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge two high voltage capacitors.
4. Disconnect the leads to the primaries of the two power transformers.
5. Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.
6. After that procedure, reconnect the power supply cord.
When the testing is completed
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge two high voltage capacitors.
4. Reconnect the all leads removed from components during testing.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is installed.
7. Run the oven and check all functions.
OVEN THERMISTOR
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.
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 magnetron
against overheat.
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 MOTOR
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 condition.
NOISE FILTER
The noise filter prevents the radio frequency interference
that might flow back in the power circuit.
