Read Sharp R-90GCK (serv.man17) Service Manual online
48
R-90GCK
SERVICING
REMEMBER TO CHECK 3D
1) Disconnect the supply.
2) Door opened, and wedged open.
3) To discharge the high voltage capacitor, wait for 60
2) Door opened, and wedged open.
3) To discharge the high voltage capacitor, wait for 60
seconds.
WARNING: AGAINST THE CHARGE OF THE
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, of
the connecting lead of the high-voltage rectifier)
against the chassis with the use of an insulated
screwdriver.
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, of
the connecting lead of the high-voltage rectifier)
against the chassis with the use of an insulated
screwdriver.
Sharp recommend that wherever possible fault-finding
is carried out with the supply disconnected. It may, in
some cases, be necessary to connect the supply after
the outer case has been removed, in this event carry
out 3D checks and then disconnect the leads to the
primary of the power transformer. Ensure that these
leads remain isolated from other components and the
oven chassis. (Use insulation tape if necessary.) When
the testing is completed carry out 3D checks and
reconnect the leads to the primary of the power trans-
former.
is carried out with the supply disconnected. It may, in
some cases, be necessary to connect the supply after
the outer case has been removed, in this event carry
out 3D checks and then disconnect the leads to the
primary of the power transformer. Ensure that these
leads remain isolated from other components and the
oven chassis. (Use insulation tape if necessary.) When
the testing is completed carry out 3D checks and
reconnect the leads to the primary of the power trans-
former.
REMEMBER TO CHECK 4R
1) Reconnect all leads removed from components
during testing.
2) Replace the outer case (cabinet) and back plate.
3) Reconnect the supply.
4) Run the oven. Check all functions.
3) Reconnect the supply.
4) Run the oven. Check all functions.
Microwave ovens should not be run 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 level to HIGH. And set the
microwave timer for two (2) 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 3D checks and re-examine the connections to the
component being tested.
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 level to HIGH. And set the
microwave timer for two (2) 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 3D checks 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.
checked and microwave leakage test should be carried out.
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts
of the high voltage circuit will result in electrocution. High voltage capacitor, High voltage transformer, Magnetron,
High voltage rectifier assembly, High voltage fuse, High voltage harness.
of the high voltage circuit will result in electrocution. High voltage capacitor, High voltage transformer, Magnetron,
High voltage rectifier assembly, High voltage fuse, High voltage harness.
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