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Lit. No. 94-30-006B
MAGNETRON
CAUTION: DISCHARGE THE HIGH VOLT-
AGE CAPACITOR BEFORE TESTING THE
MAGNETRON. REFER TO PAGE 18 FOR
THE PROCEDURE.
Refer to Page 22 to access the magnetron. To
test the magnetron, perform the following steps.
1.
Turn off the electrical power to the oven.
2.
Set the ohmmeter to the R x 1 scale.
3.
Disconnect the leads from the filament
terminals of the magnetron.
4.
Touch the test leads to the primary termi-
nals. The meter should indicate less than
1 Ω.
MAGNETRON THERMAL
CUTOUT (TCO)
Terminals
Filament
Terminals
CAUTION: DISCHARGE THE HIGH VOLT-
AGE CAPACITOR BEFORE TESTING THE
MAGNETRON THERMAL CUTOUT. RE-
FER TO PAGE 18 FOR THE PROCEDURE.
Refer to Page 27 to access the magnetron ther-
mal cutout (TCO). To test the TCO, perform
the following steps.
1.
Turn off the electrical power to the oven.
2.
Set the ohmmeter to the R x 1 scale.
3.
Disconnect one of the leads from the mag-
netron TCO terminals.
4.
Touch the test leads to the normally-closed
terminals. The meter should indicate a
short circuit (0 Ω). NOTE: If the meter
indicates an open circuit, (infinite resis-
tance), press the reset button on the TCO
and check it again. If it remains open,
replace the TCO.
Page 53
CM Oven Service Manual
Reset Button
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