Warning To Service Personnel - Sharp R-1880LS Service Manual

R-1880LS/LST

WARNING TO SERVICE PERSONNEL

Microwave ovens contain circuitry capable of producing
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 Trans-
former, Magnetron, High Voltage Rectifier Assembly,
High Voltage Harness etc..
Read the Service Manual carefully and follow all in-
structions.
Before Servicing
1. Disconnect the power supply cord
remove outer case.
. Open the door and block it open.
3. Discharge high voltage capacitor.
WARNING: RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.
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 these 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.
, a n d t h e n 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.
After repairing
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 run empty. To test for the pres-
ence 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 microwave
leakage test should be carried out.
6
Don't Touch !
Danger High Voltage