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5-17

No microwave oscillation.

Defective relay 2 of P.C.B.

Defective high voltage 
transformer.

Test procedure high voltage
transformer.

Test procedure relay 2 of
P.C.B.

Defective high voltage
capacitor.

Defective high voltage
diode.

Test procedure high voltage
diode.

Test procedure high voltage
capacitor.

Defective magnetron.

Low AC input voltage.

Use the microwave oven at
adequate line voltage.

Test procedure magnetron.

Open or loose wiring to
above components.

Blown fuse

Check and repair wiring.

Check fuse

Spark occurring.

Using metallic ware and
allowing it to touch the 
oven wall.

Ceramic ware trimmed in
gold or silver powder is used.

Do not use any type of cook
ware with metallic trimming.

Do not use metallic ware for
cooking except where noted
in the cookbook.

Grill rack is using in no load
condition.

Do not use the oven at
microwave and combination
mode with the grill rack
placed in the cavity when
the oven is empty.

5-18

Convection indicator lights
but oven does not go into
cook cycle when START key
is touched.

Temperature in the oven
cavity is lower or higher than
preset.

Defective circulation motor
wire ass'y.

Defective circulation
MOTOR.

Defective Relay 4, 8.

Defective relay 3, 4 or relay
8.

Defective convection heater
element.

Defective grill heater 
element.

Defective circulation Motor.

Defective or disconnected
thermistor.

Defective Solenoid

Defective Rectifire ASM

Defective DAMPER of
Airduct

Defective thermistor.

Test procedure thermistor.

Check and repair C-Motor wire
ass'y. (COM:YL, 24V:BN, 230V:BL)

Check and replace
C-Motor.

Test procedure relay 4, 8 of
P.C.B.

Test procedure relay 3, 4 or
relay 8 of P.C.B.

Test procedure convection
heater.

Test procedure grill heater.

Check the rotating of 
circulation fan.

Test or replace thermistor.

Test or Replace Solenoid

Check Diode(4pcs) or
Replace Rectifire ASM

Check or Repair Damper 
Pin and spring.

F1, F2, F5 is Fail display

Thermistor short (F1)

No sensing of 
thermistor (F2)

High initial temperature of
oven cavity. (F5)

Replace thermistor

Wait until low temperature of
oven cavity.

5-19

Grill indicator lights 
but oven does not go into
cook cycle when START key
is touched.

Temperature in the oven
cavity is lower or higher then
preset.

Defective relay 3 of P.C.B.

Open or loose wire 
connection to the above
components.

Check and repair wiring.

Test procedure relay 3 of
P.C.B.

Open or loose wire 
connection to P.C.B.

Check and repair wiring.

Defective relay 3 of P.C.B.

Defective grill heater 
element.

Test procedure grill heater.

Test procedure relay 3 of
P.C.B.

• MAKE SURE THE WIRE LEADS CORRECT POSITION.
• WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE TO GRASP THE CONNECTOR,

AND NOT THE WIRES.

• WHEN REMOVING THE MAGNETRON, BE SURE TO INSTALL THE MAGNETRON GASKET IN THE

CORRECT POSITION AND GOOD CONDITION.

• When you replace the magnetron, measure microwave

energy leakage before the out case is installed and
after all necessary components are replaced or
adjusted.
Special care should be taken in measuring the
following parts. (Shaded area of below Fig.)
— Around the magnetron
— The waveguide

• After all components, including the outer case, are fully

assembled, measure for microwave energy leakage
around the door viewing window, the exhaust opening
and air inlet openings.

• Microwave energy leakage must not exceed the values

prescribed below.

NOTES:
Leakage with the outer case removed - less than 
5 mW/cm

2

.

Leakage for a fully assembled oven (“Before the latch
switch (primary) is interrupted”) with the door in a slightly
opened position - less than 4 mW/cm

2

.

• Do not exceed meter full scale deflection.
• The test probe must be removed no faster than, 

1 inch/sec (2.5 cm/sec) along the shaded area,
otherwise a false reading may result.

• The test probe must be held with the grip portion of the

handle.
A false reading may result if the operator’s hand is
between the handle and the probe.

• When testing near a corner of the door, keep the probe

perpendicular to the surface making sure the probe
horizontally along the oven surface, this may possibly
cause probe damage.

• After adjustment and repair of any microwave energy

interruption or microwave energy blocking
device, record the measured values for future
reference. Also enter the information on the service
invoice.

• Should the microwave energy leakage not be more

than 4 mW/cm

2

after determining that all parts are in

good condition, functioning properly and genuine
replacement parts which are listed in this manual have
been used.

• At least once a year, have the electromagnetic energy

leakage monitor checked for calibration by its
manufacture.

5-2