R -4A52
R-4E52
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below
before oDerating the oven.
1. CARRY OUT 3D CHECKS.
2. Make sure that a definite “click” can be heard when
the microwave oven door is unlatched. (Hold the
door in a closed position with one hand, then push
the door open button with the other, this causes the
latch heads to rise, it is then possible to hear a
“click” as the door switches operate.)
3. Visually check the door and cavity face plate for
damage (dents, cracks, signs of arcing etc.).
I. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal is damaged.
4. The door is bent or warped.
5. There are defective parts in the door interlock sys-
tem.
6. There are defective parts in the microwave generat-
ing and transmission assembly.
7. There is visible damage to the oven.
Carry out any remedial work that is necessary before
operating the oven.
Do not operate the oven:
I. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
Do not operate the oven if any of the following con-
3. If the door is not closed.
ditions exist;
4. If the outer case (cabinet) is not fitted.
Please refer to ‘OVEN PARTS, CABINET PARTS, DOOR PARTS’, when carrying out any of the following removal
procedures:
OUTER CASE REMOVAL
3. Remove the screws from rear and .along the side
To remove the outer case, proceed as follows.
edge of case.
1. Disconnect oven from power supply.
4. Slide the entire case back about 1 inch (3cm) to
2. Open the oven door and wedge it open.
free it from retaining clips on the cavity face plate.
5. Lift the entire case from the oven.
moved.
6. Discharge the HV capacitor before carring out any
N.B.; Step I,2 and 6 form the basis of the 3D checks.
further work.
CAUTION: DISCHARGE
7. Do not operate the oven with the outer case re-
HIGH VOLTAGE
CAPACITOR BEFORE TOUCHING ANY
OVEN COMPONENTS OR WIRING.
HIGH VOLTAGE COMPONENTS REMOVAL
(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)
To remove the components, proceed as follows.
1. CARRY OUT 3iJ CHECKS
2. Disconnect the high voltage wire A from the
7. Disconnect high voltage wire A and terminals of
high voltage rectifier assembly from high voltage
capacitor.
magnetron.
3. Disconnect the filament lead(shorter one) of the
8. Now high voltage rectifier assembly and capacitor
power transformer.
should be free.
I
4. Disconnect the high voltage wire of the H.V.
rectifier assembly fromt he high’voltage capacitor.
5. Remove one (1) screw holding capacitor holder to
the oven cavity.
6. Remove one (1) screw holding earth side terminal
of high voltage rectifier assembly, and remove
capacitor holder from the high voltage capacitor,
CAUTION: W-HEN REPLACING HIGH VOLTAGE
RECTIFIER ASSEMBLY, ENSURE THAT
THE CATHODE (EARTH) CONNECTION
IS SECURELY FIXED TO THE
CAPACITOR HOLDER WITH A EARTH-
ING SCREW.
POWER TRANSFORMER REMOVAL
1. CARRY OUT3JCHECKS
4. Disconnect the high voltage wire of H.V. rectifier
2. Remove the fan motor assembly from the oven re- assembly from the power assembly.
ferring to “FAN MOTOR ASSEMBLY”.
5. Remove the two (2) screws holding the transformer
3. Disconnect the the filament lead of the power
to bottom plate right.
transformer from high voltage capacitor.
6. Remove the transformer from the bottom plate right.
7. Now, the power transformer is free.
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