Servicing; Warning To Service Personnel; General Information - Electrolux MC1751E Service Manual

WARNING TO SERVICE PERSONNEL

Microwave ovens contain circuitry capable of producing very high voltage and current.
Contact with the following parts will result in electrocution
High voltage capacitor, High Voltage transformer, Magnetron, High voltage rectifier assembly,
High voltage wires.
REMEMBER TO CHECK 3D
1) Disconnect the supply.
2) Door opened, and wedged open.
3) Discharge high voltage capacitor.
WARNING AGAINST THE CHARGE OF THE
HIGH VOLTAGE CAPACITOR
The high-voltage capacitor remains charged about
60seconds 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.
It is recommended 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 transformer.
When troubleshooting the microwave oven, it is
helpful to follow the Sequence of Operation in
performing the checks.
Many of the possible causes of trouble will require
that a specific test be performed. These tests are
given a procedure letter which will be found in the
"Test Procedure" section.
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING
CODE:
As part of our policy of continuous improvement, we reserve the right to
alter design and specifications without notice
SOI 01.05 FV

SERVICING

GENERAL INFORMATION

WARNING
THIS APPLIANCE MUST BE EARTHED
IMPORTANT
GREEN-AND-YELLOW
BLUE
BROWN
REMEMBER TO CHECK 4R
1) Reconnect all leads removed from components
during testing.
2) Replace the outer case (cabinet).
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 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 a microwave leakage test carried
out.
IMPORTANT: If the oven becomes inoperative
because of a blown fuse F1 in the
monitored latch switch - monitor
switch - circuit, check the
monitored latch switch and monitor
switch and before replacing the
fuse F1.
: EARTH
: NEUTRAL
: LIVE
5/33 599 36 78-06