GE JKP18 Series, Technical Service Manual

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Microwave High-Voltage Transformer
WARNING: Discharge the high-voltage capacitor
before touching any oven components or wiring.
The microwave must be removed from the oven to
service the high-voltage transformer.
The high-voltage transformer is mounted to the
microwave baseplate with 4 Phillips screws.
High-Voltage Transformer Test
1. Disconnect the primary input terminals (white
and black wires) and measure the resistance
of the transformer with an ohmmeter. Resis-
tance should be less than 1 ohm.
2. Measure the resistance on the high-voltage
side of the transformer (terminal 5 to chassis
ground).
a. Disconnect red/black wire from capacitor.
b. Connect ohmmeter between red/black wire
and chassis ground.
c. Resistance should be between 70 to 110
ohms.
3. Measure the resistance of the filament wind-
ings (terminal 4 to 3).
a. Disconnect connector from magnetron.
b. Connect ohmmeter between terminals of
connector.
c. Resistance should be less than 1 ohm.
Microwave Magnetron
The microwave must be removed from the oven to
replace the magnetron.
WARNING: When replacing the magnetron, be
certain the R.F. gasket is in place and mounting
screws are tightened securely to the waveguide.
Failure to do so can result in hazardous levels of
microwave leakage. Perform microwave leakage
test.
WARNING: High voltages are present during the
cook cycle, extreme caution should be observed.
Disconnect oven from power supply and dis-
charge the high-voltage capacitor before touching
any oven components or wiring.
The magnetron is mounted in the component
compartment with 4 Phillips screws.
Magnetron Fan
Magnetron
Connector
Transformer
Primary
Input
Terminals
Terminal 5
(red/black wire)
Chassis
Ground
Terminal 3
Terminal 4
High-Voltage
Transformer
High-Voltage Capacitor