Component Replacement And Adjustment Procedure - Sharp R-84ST Service Manual

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before
operating 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 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 oper-
ating 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 backplate.
4. Remove the screws from rear and along the side edge of
case.
5. Slide the entire case back about 3cm to free it from
retaining clips on the cavity face plate.
(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)
To remove the components, proceed as follows.
1. CARRY OUT 3D CHECKS
2. Disconnect all the leads and terminals of high voltage
rectifier assembly from the high voltage capacitor.
3. Remove one (1) screw holding earth side terminal of high
voltage rectifier assembly and remove capacitor holder.
4. Remove one (1) screw holding capacitor holder to oven
cavity.
5. Release the capacitor holder from the duct.
1. CARRY OUT 3D CHECKS
2. Disconnect the filament leads of high voltage transformer
from high voltage capacitor and the magnetron.
3. Disconnect the H.V. wire A from the high voltage
transformer.
4. Disconnect the main wire harness from the high voltage
transformer.
1. CARRY OUT 3D CHECKS
2. Remove outer wrap.
3. Disconnect wiring panel.
OUTER CASE REMOVAL
HIGH VOLTAGE COMPONENTS REMOVAL
HIGH VOLTAGE TRANSFORMER REMOVAL
CONTROL PANEL REMOVAL
R-84ST -
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1. 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 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. Lift the entire case from the oven.
7. Discharge the H.V. capacitor before carrying out any
further work.
8. Do not operate the oven with the outer case removed.
N.B.; Step 1, 2 and 6 form the basis of the 3D checks.
CAUTION: DISCHARGE HIGH VOLTAGE CAPACITOR
BEFORE TOUCHING ANY OVEN COMPONENT OR
WIRING.
6. Remove the capacitor from the capacitor holder.
7. Now high voltage rectifier assembly and capacitor should
be free.
CAUTION: WHEN REPLACING HIGH VOLTAGE
RECTIFIER ASSEMBLY, ENSURE THAT
THE CATHODE (EARTH) CONNECTION IS
SECURELY FIXED TO THE CAPACITOR
HOLDER WITH AN EARTHING SCREW.
5. Remove the two (2) screws and one (1) washer holding
the transformer to base plate.
6. Remove the transformer.
7. Now the high voltage transformer is free.
4. Lift up the control panel assembly and pull it forward. Now
the control panel assembly is free.