Sharp R-211A, Service Manual

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R-211A
13
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 dam-
age (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;
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 3cm to free it from
retaining clips on the cavity face plate.
5. Lift the entire case from 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.
Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any
of the following removal procedures:
OUTER CASE REMOVAL
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 form the basis of the 3D checks.
CAUTION: DISCHARGE HIGH VOLTAGE CAPACITOR
BEFORE TOUCHING ANY OVEN COMPO-
NENT OR WIRING.
HIGH VOLTAGE COMPONENTS REMOVAL
(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)
To remove the components, proceed as follows.
1. CARRY OUT 3D CHECKS.
2. Remove one (1) screw holding capacitor holder to rear
cabinet.
3. Disconnect the H.V. wire of the H.V. rectifier assembly
from the magnetron.
4. Disconnect the filament lead of the power transformer
from the H.V. capacitor.
5. Remove one (1) screw holding earth side terminal of
high voltage rectifier assembly, and remove capacitor
holder.
6. Disconnect all the leads and terminals of high voltage
rectifier assembly from high voltage capacitor.
7. Disconnect the H.V. wire B from the H.V. capacitor.
8. Now H.V. rectifier assembly and H.V. capacitor should
be free.
CAUTION: WHEN REPLACING HIGH VOLTAGE REC-
TIFIER ASSEMBLY, ENSURE THAT THE
CATHODE (EARTH) CONNECTION IS SE-
CURELY FIXED TO THE CAPACITOR
HOLDER WITH AN EARTHING SCREW.
CAUTION: DO NOT REPLACE ONLY HIGH VOLTAGE
RECTIFIER. WHEN REPLACING IT, RE-
PLACE HIGH VOLTAGE RECTIFIER AS-
SEMBLY.
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads (main wire harness and H.V.
wire) from power transformer.
3. Disconnect the lead from magnetron filament.
4. Remove one (1) screw holding capacitor holder to rear
cabinet.
5. Disconnect the lead of the power transformer from high
voltage capacitor.
6. Remove the two (2) screws holding the transformer to
bottom plate.
7. Remove the transformer.
POWER TRANSFORMER REMOVAL