18
R-4A68
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, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any of
the following removal procedures:
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 four (4) 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.
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from power transformer,
magnetron and capacitor terminals.
3. Remove four (4) screws holding transformer to bottom
plate.
4. Remove transformer from bottom plate.
Re-install
1. Rest transformer on the bottom plate with its primary
Removal
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from magnetron.
3. Remove the two (2) screws holding the magnetron air
duct to magnetron. And slide magnetron air duct slightly
so that two (2) screws at left hand side of magnetron
appear.
4. Carefully remove the four (4) screws holding magnetron
to waveguide flange.
5. Remove magnetron with care so that magnetron antenna
is not hit by any metal object around antenna.
6. Now, the magnetron is free.
Re-install
1. Re-install the magnetron to waveguide flange with care
POWER TRANSFORMER REMOVAL
terminals toward front side.
2. Secure the transformer with four (4) screws to bottom plate.
3. Re-connect wire leads (primary and high voltage) to
power transformer and filament leads of transformer to
magnetron and high voltage capacitor. Refer to
"PICTORIAL DIAGRAM".
4. Re-install outer case and check that oven is operating
properly.
MAGNETRON REMOVAL
so that magnetron antenna is not hit by any metal
object.
2. Secure the magnetron with four (4) screws.
3. Hold the magnetron air duct to the magnetron and
secure the magnetron air duct with two (2) screw.
4. Re-connect the wire leads to the magnetron. Refer to
"PICTORIAL DIAGRAM".
5. Re-install outer case and check that the oven is
operating properly.
CAUTION: WHEN REPLACING MAGNETRON, BE
SURE THE R.F. GASKET IS IN PLACE AND
MOUNTING SCREWS ARE TIGHTENED
SECURELY.
Summary of Contents for R-4A68
Page 2: ...R 4A68 ...
Page 36: ...34 R 4A68 96SHARP CORP 03U0 07E Printed in Japan ...
