Sharp R-480J service manual Component Replacement and Adjustment Procedure, Outer Case Removal

R-480J

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven.

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;

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:

WARNING FOR WIRING

To prevent an electric shock, take the following			and Oven cavity.
manners.			3) Sharp edge:
1. Before wiring,			Bottom plate, Oven cavity, Waveguide flange,
1)	Disconnect the power supply.		Chassis support and other metallic plate.
2)	Open the door and wedge the door open.		4) Movable parts (to prevent a fault)
3)	Discharge the high voltage capacitor and wait for		Fan blade, Fan motor, Switch, Switch lever,
	60 seconds.		Open button.
2. Don't let the wire leads touch to the following parts;		3.	Do not catch the wire leads in the outer case cabinet.
1)	High voltage parts:	4.	Insert the positive lock connector certainly until its
	Magnetron, High voltage transformer, High		pin is locked. And make sure that the wire leads
	voltage capacitor, High voltage rectifier assembly		should not come off even if the wire leads is pulled.
	and High voltage fuse.	5.	To prevent an error function, connect the wire leads
2)	Hot parts:		correctly, referring to the Pictorial Diagram.
	Oven lamp, Magnetron, High voltage transformer

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.

POWER TRANSFORMER REMOVAL

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

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.

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