Sharp R-9H56, Service Manual

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R-9H56
27
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 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:
OUTER CASE REMOVAL
To remove the outer case, proceed as follows.
1. Disconnect the 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 (3cm) 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 carring out any
further work.
7. Do not operate the oven with the outer case removed.
N.B.; Step1, 2 and 6 from the basis of the 3D checks.
CAUTION: DISCHARGE HIGH VOLTAGE CAPACITOR
BEFORE TOUCHING ANY OVEN COMPO-
NENTS OR WIRING.
REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads from power transformer.
3. Disconnect the filament leads of the power transformer
from the megnetron and high voltage capacitor.
4. Disconnect the high voltage leads of capacitor from the
transformer.
5. Remove the two (2) screws and one (1) washer holding
the transformer to the base cabinet.
6. Remove the transformer.
RE-INSTALL
1. Rest the transformer on the base cabinet with its primary
terminals toward rear cabinet.
2. Insert the two edges of the transformer into two metal
tabs of the base cabinet.
POWER TRANSFORMER REPLACEMENT
3. Make sure the transformer is mounted correctly to the
corners underneath those tabs.
4. After re-installing the transformer, secure the transformer
with two screws to the bace cabint, one is with outertooth
washer and the other is without outer-tooth washer.
5. Re-connect the wire leads (primary and high voltage)
and high voltage lead to the transformer and filament
leads of transformer to the magnetron and capacitor,
referring to the “Pictorial Diagram”.
6. Re-install the outer case and check that the oven is
operating properly.
NOTE: LIVE(ORANGE) WIRE MUST BE CONNECTED
TO THE CABINET-SIDE OF THE POWER
TRANSFORMER.
1. CARRY OUT 3D CHECKS
2. Disconnect filament lead of transfomer and high voltage
wire lead from magnetron.
3. Take off three (3) screws secured the chassis support to
oven cavity and waveguide.
4. Remove the cooling fan assembly refer to “Cooling Fan
Removal”
5. Carefully remove four (4) mounting screws holding the
magnetron and magnetron air guide to waveguide. When
removing the screws hold the magnetron and magnetron
air guide to prevent it from falling.
6. Remove the magnetron from the waveguide with care so
the magnetron antenna should not hit by any metal
object around the antenna
CAUTION: WHEN REPLACING THE MAGNETRON, BE
SURE THE R.F. GASKET IS IN PLACE AND
THE MAGNETRON MOUNTING SCREWS
ARE TIGHTENED SECURELY.
MAGNETRON REMOVAL