Component Replacement And Adjustment Procedure - Sharp R-677W Service Manual

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;
Please refer to 'OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS', when carrying out any
of the following removal procedures:
To prevent an electric shock, take the following
manners.
1. Before wiring,
1) Disconnect the power supply.
2) Open the door and wedge the door open.
3) Discharge the high voltage capacitor and wait for
60 seconds.
2. Don't let the wire leads touch to the following parts;
1) High voltage parts:
Magnetron, High voltage transformer, High volt-
age capacitor and High voltage rectifier assem-
bly.
2) Hot parts:
Top heating element, Bottom heating element,
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 3 cm to free it from
retaining clips on the cavity face plate.
5. Lift the entire case from the oven.
(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 except for the terminal of high
voltage rectifier from the high voltage capacitor.
3. Remove one (1) screw holding capacitor holder and
high voltage rectifier earth terminal to the power angle.
4. Release the capacitor holder from the power angle.
5. Remove the capacitor from the capacitor holder.
6. Remove the terminal of high voltage rectifier from the
high voltage capacitor.
WARNING FOR WIRING
OUTER CASE REMOVAL
HIGH VOLTAGE COMPONENTS REMOVAL
R-677 - 24
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.
Oven lamp, Magnetron, High voltage transformer
and Oven cavity.
3) Sharp edge:
Bottom plate, Oven cavity, Weveguide flange,
Chassis support and other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Open lever, Open
button.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector fully until its pin is
locked. And make sure that the wire leads should 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.
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 CAPACI-
TOR BEFORE TOUCHING ANY OVEN
COMPONENT OR WIRING.
7. Now, the high voltage rectifier and the capacitor should
be free.
CAUTION: WHEN REPLACING HIGH VOLTAGE REC-
TIFIER, ENSURE THAT THE CATHODE
(EARTH) CONNECTION IS SECURELY
FIXED TO THE CAPACITOR HOLDER AND
POWER ANGLE WITH AN EARTHING
SCREW.