Component Replacement And Adjustment Procedure - Sharp R-1750 Service Manual

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may
result in severe, possibly fatal, electric shock.
(Example)
Inverter unit that includes High Voltage Capacitor, Power Transformer, High Voltage Rectifier and Heat sink etc., and
Magnetron, High Voltage Harness etc..
Avoid possible exposure to microwave energy. Please follow the instructions below before
WARNING:
operating the oven.
1. Disconnect the power supply cord.
2. 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 is damaged.
To prevent an electric shock, take the following pre-
cautions.
1. Before wiring,
1) Disconnect the power supply cord.
2) Open the door block it open.
3) To discharge high voltage capacitor, wait for 60
seconds.
2. Don't let the wire leads touch to the followiong parts;
1) High voltage parts:
Magnetron, Inverter unit.
2) Hot parts:
Oven lamp, Magnetron, Inverter unit and Oven cavity.
Please refer to 'OVEN PARTS, CABINET PARTS, CONTROL PANAL PARTS, DOOR PARTS', when carrying out any of
the following removal procedures:
THE FOLLOWING ADJUSTMENTS OR COMPONENT REPLACEMENT CAN BE PERFORMED
1. Hood lamps, sockets and grease filter.
2. Oven lamp, base cover and hood lamp glass assembly.
3. Turntable motor.
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. Remove the one (1) screw holding the hood exhaust
louver to the oven cavity with the outer case cabinet.
4. Pull the hood exhaust louver from the oven cavity by
pushing the right and left tabs of the hood exhaust louver
to remove.
WARNING AGAINST HIGH VOLTAGE:
WARNING FOR WIRING
WITHOUT REMOVING THE OVEN FROM THE WALL
HOOD EXHAUST LOUVER REMOVAL
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.
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange,
Chassis support and other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Stirrer motor, Stirrer
fan.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector until its pin is locked
and make sure that the wire leads do not come off even
if the wire leads are pulled.
5. To prevent an error function, connect the wire leads
correctly, referring to the Pictorial Diagram.
4. Hood exhaust louver.
5. Control panel assembly or components
6. Stirrer cover and stirrer fan.
5. Now, the hood exhaust louver is free.
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R-1750
R-1751
R-1752
R-1754
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