Section 3 Troubleshooting And Testing; Troubleshooting Guide Chart - Frigidaire CGMV173KB Servicing

Troubleshooting Guide
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.
CAUTION
If oven becomes inoperative because of a blown C/T fuse, check monitor switch, relay (RY1),
secondary interlock relay (RY2), stop switch (door sensing switch), primary interlock switch and
third door switch before replacing C/T fuse. If C/T fuse is replaced, the monitor switch must also be
replaced.
WARNING
Whenever troubleshooting is performed with the power supply cord disconnected. It may in, some
cases, be necessary to connect the power supply cord after the outer case has been removed, in this
event:
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. To discharge high voltage capacitor, 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.
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.
WARNING
When the testing is completed:
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. To discharge high voltage capacitor, 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.
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.
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 then 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 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.

Section 3 Troubleshooting and Testing

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