Component Replacement And Adjustment Procedure - Sharp R-27STM Service Manual

R-27STM

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in se -
vere, possibly fatal, electric shock.
(Example)
High Voltage Capacitor, High Voltage Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage fuse, High Voltage
Harness etc..
WARNING:
1. Disconnect the power supply cord.
Visually check the door and cavity face plate for damage
2.
(dents, cracks, signs of arcing etc.).
Carry out any remedial work that is necessary before operat -
ing the oven.
Do not operate the oven if any of the following conditions exist;
Door does not close firmly.
1.
Door hinge, support or latch hook is damaged.
2.
The door gasket or seal is damaged.
3.
4. The door is bent or warped.
To prevent an electric shock, take the following manners.
1. Before wiring,
1) Disconnect the power supply cord.
Open the door and block it open.
2)
3) Discharge the high voltage capacitor and wait for 60
seconds.
1. Don't let the wire leads touch to the following parts;
1) High voltage parts:
Magnetron, High voltage transformer, High voltage ca -
pacitor, High voltage rectifier assembly and High volt -
age fuse.
2) Hot parts:
Oven lamp, Magnetron, High voltage transformer and
Please refer to `OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS', when carrying out any of the following
removal procedures:
To remove the outer case, procedure as follows.
1. Disconnect the oven from power supply.
2. Open the oven door and wedge it open.
3. Remove the two (2) screws from right side of the outer case
cabinet.
4. Remove the five (5) screws from rear and along the side
edge of case.
Slide the entire case back about 3cm to free it from retaining
5.
R27STM.indd 14
WARNING AGAINST HIGH VOLTAGE:
Avoid possible exposure to microwave energy. Please follow the instructions
below before operating the oven.
WARNING FOR WIRING
REMEMBER TO CHECK 3D
1) Disconnect the supply.
2) Door opened, and wedged open.
3) Discharge high voltage capacitor.
OUTER CASE REMOVAL
14
There are defective parts in the door interlock system.
5.
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:
Without the RF gasket (Magnetron).
1.
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
If the outer case (cabinet) is not fitted.
4.
Oven cavity.
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange and other
metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Turntable motor and Switch.
1. Do not catch the wire leads in the outer case cabinet.
Insert the positive lock connector certainly until its pin is
2.
locked and make sure that the wire leads do not come off
even if the wire leads are pulled.
3. To prevent an error function, connect the wire leads cor -
rectly, referring to the Pictorial Diagram.
clips on the cavity face plate.
6. Lift the entire case from the oven.
7. Discharge the H. V. capacitor before carrying out any further
work.
8. Do not operate the oven with the outer case removed.
NOTE: Step 1, 2 and 7 form the basis of the 3D checks.
CAUTION: DISCONNECT OVEN FROM POWER SUPPLY BE -
FORE REMOVING OUTER CASE.
11/3/08 2:04:27 PM