Component Replacement And Adjustment Procedure - Sharp R-3S56 Service Manual

R-3S56

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
1. Disconnect oven from 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:
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 eight (8) screws from rear and along the
side edge of case.
4. Slide the entire case back about 3cm to free it from
retaining clips on the cavity face plate.
5. Lift the entire case from the unit.
(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)
To remove the components, proceed as follows.
1. CARRY OUT 3D CHECKS.
2. Lift up the HVC cover.
3. Disconnect the H.V. wire of the H.V. rectifier assembly
from the power tramsformer.
4. Disconnect the filament lead of the power transformer
from the H.V. capacitor.
5. Remove one (1) screw holding capacitor holder to rear
cabinet.
6. Remove one (1) screw holding earth side terminal of high
voltage rectifier assembly, and remove capacitor holder.
7. Disconnect all the leads and terminals of high voltage
rectifier assembly from high voltage capacitor.
8. Disconnect the H.V. wire A from the H.V. rectifier, assy.
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads (main wire harness and H.V.
wire) from power transformer.
3. Release the lead of the power transformer from the wire
holder.
4. Disconnect the lead from magnetron filament.
OUTER CASE REMOVAL
HIGH VOLTAGE COMPONENTS REMOVAL
POWER TRANSFORMER REMOVAL
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.
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 7 form the basis of the 3D checks.
CAUTION: DISCHARGE HIGH VOLTAGE CAPACITOR
BEFORE TOUCHING ANY OVEN COMPONENT
OR WIRING.
CAUTION: WHEN REPLACING HIGH VOLTAGE
RECTIFIER ASSEMBLY, ENSURE THAT THE
CATHODE (EARTH) CONNECTION IS
SECURELY FIXED TO THE CAPACITOR
HOLDER WITH AN EARTHING SCREW.
CAUTION: DO NOT REPLACE ONLY HIGH VOLTAGE
RECTIFIER. WHEN REPLACING IT,
REPLACE HIGH VOLTAGE RECTIFIER
ASSEMBLY.
9. Now H.V. rectifier assy. and H.V. copacitor. Should be
free.
5. Disconnect the lead of the power transformer from high
voltage capacitor.
6. Remove the four (4) screws holding the transformer to
bottom plate.
7. Remove the transformer.
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