Sharp R-520LK ユーザーズマニュアル

3

Microwave ovens contain circuitry capable of pro-
ducing very high voltage and current, contact with
following  parts

  may  result  in  a  severe,  possibly

fatal, electrical shock.
(Example)
High  Voltage  Capacitor,  High  Voltage  Power
Transformer,  Magnetron,  High  Voltage  Rectifier
Assembly, High Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.

1.  Disconnect the power supply cord

,  and  then

remove outer case.

.  Open the door and block it open.
3.  Discharge high voltage capacitor.

The  high-voltage  capacitor  remains  charged  about  60
seconds after the oven has been switched off. Wait for
60 seconds and then short-circuit the connection of the
high-voltage capacitor (that is the connecting lead of the
high-voltage rectifier) against the chassis with the use of
an insulated screwdriver.

Whenever troubleshooting is performed the power supply
must be disconnected. It may, in some cases, be necessary
to connect the power supply after the outer case has been
removed, in this event:
1.  Disconnect  the  power  supply  cord,  and  then  remove

outer case.

.  Open the door and block it open.
3.  Discharge high voltage capacitor.
4.  Disconnect  the  leads  to  the  primary  of  the  power

transformer.

5.  Ensure  that  the  leads  remain  isolated  from  other

components  and  oven  chassis  by  using  insulation
tape.

6.  After that procedure, reconnect the power supply cord.

When the testing is completed,
1.  Disconnect  the  power  supply  cord,  and  then  remove

outer case.

.  Open the door and block it open.
3.  Discharge high voltage capacitor.
4.  Reconnect  the  leads  to  the  primary  of  the  power

transformer.

5.  Reinstall the outer case (cabinet).
6.  Reconnect the power supply cord after the outer case

is installed.

7.  Run the oven and check all functions.

1.  Reconnect all leads removed from components during

testing.

.  Reinstall the outer case (cabinet).
3.  Reconnect the power supply cord after the outer case

is installed.

4.  Run the oven and check all functions.

Microwave ovens should not be operated empty. To test for
the presence of microwave energy within a cavity, place a
cup of cold water on the oven turntable, close the door and
set the power to HIGH and set the microwave timer for two
() minutes. When the two minutes has elapsed (timer at
zero) carefully check that the water is now hot. If the water
remains cold carry out

Before Servicing procedure and re-

examine the connections to the component being tested.

When all service work is completed and the oven is fully
assembled, the microwave power output should be checked
and a microwave leakage test should be carried out.