20
R-4A56
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal or damaged.
4. The door is bent or warped.
5. There are defective parts in the door interlock system.
6. There are defective parts in the microwave generating
and transmission assembly.
7. There is visible damage to the oven.
Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
1. Disconnect the oven from the power supply.
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 leads 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.).
Carry out any remedial work that is necessary before
operating the oven.
Do not operate the oven if any of the following conditions
exist;
Please refer to ‘OVEN PARTS, CABINET PARTS, DOOR PARTS’, when carrying out any of the following removal
procedures:
1. CARRY OUT 3D CHECKS.
2. Remove the fan motor assembly from the oven referring
to “FAN MOTOR REPLACEMENT”.
3. Disconnect the filament lead of the power transformer
from high voltage capacitor.
4. Disconnect the filament lead of the power transformer
from the magnetron.
OUTER CASE REMOVAL
To remove the outer case, proceed as follows.
1. Disconnect oven from power supply.
2. Open the oven door and wedge it open.
3. Remove the screws from rear and along the side edge of
case.
4. Slide the entire case back about 1 inch (3 cm) to free it
from retaining clips on the cavity face plate.
5. Lift the entire case from the oven.
6. Discharge the H.V. capacitor before carrying out any
further work.
7. Do not operate the oven with the outer case removed.
N.B.; Step 1,2 and 6 from the basis of the 3D checks.
CAUTION: DISCHARGE HIGH VOLTAGE CAPACITOR
BEFORE TOUCHING ANY OVEN COMPO-
NENTS OR WIRING.
POWER TRANSFORMER REMOVAL
5. Disconnect the high voltage wire of H.V. rectifier assembly
from the power transformer.
6. Remove the one (1) screw from under side and two (2)
screws from upper side holding the transformer to bottom
plate.
7. Remove the transformer.
HIGH VOLTAGE COMPONENTS REMOVAL
(High Voltage Capacitor and High Voltage Rectifier Assembly)
from the high voltage capacitor.
7. Disconnect high voltage wire A and terminals of high
voltage rectifier assembly from high voltage capacitor.
8. Now high voltage rectifier assembly and capacitor
should be free.
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTI-
FIER ASSEMBLY, ENSURE THAT THE CATH-
ODE (EARTH) CONNECTION IS SECURELY
FIXED TO THE CAPACITOR HOLDER WITH
AN EARTHING SCREW.
To remove the components, proceed as follows.
1. CARRY OUT 3D CHECKS.
2. Disconnect the high voltage wire A from the magnetron.
3. Disconnect the filament lead (shorter one) of the power
transformer.
4. Disconnect the high voltage wire of the H.V. rectifier
assembly from the 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
1. CARRY OUT 3D CHECKS.
2. Disconnect the H.V. wire A and filament lead (longer
MAGNETRON REMOVAL
one) of the transformer from the magnetron.
3. Release the main harness from the tabs of the air duct.
Summary of Contents for R-4A56
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