Microwave High-Voltage Diode - GE ZEK957 Series Technical Service Manual

Microwave High-Voltage Diode

The microwave must be removed from the oven to
service the high-voltage diode.
WARNING: Discharge the high-voltage capacitor before
touching any oven components or wiring.
The high-voltage diode is connected to the high-voltage
capacitor and is grounded to the chassis.
High-Voltage Diode Test
To test diode for a short:
1. Isolate the diode from the circuit.
2. Set ohmmeter to diode setting.
Note: Reading may differ with various types and brands
of meters.
3. Measure the resistance across the diode. An infinity
or +OL reading should appear.
To test diode forward bias:
1. Set ohmmeter to highest ohm setting.
2. Connect the lead from the positive side of the ohm-
meter to the negative terminal of a 9 volt battery.
3. Connect the positive diode terminal to the positive
terminal of the battery.
4. Connect the common lead of the ohmmeter to the
diode ground terminal.
Note: Reading may differ with various types and brands
of meters.
Ohmmeter reading should be approximately 1.400
ohms.
To test reverse bias:
1. Set ohmmeter to highest ohm setting.
2. Connect the lead from the positive side of the ohm-
meter to the negative terminal of a 9 volt battery.
3. Connect the negative diode terminal to the positive
terminal of the battery.
4. Connect the common lead of the ohmmeter to the
positive diode terminal.
Note: Reading may differ with various types and brands
of meters.
Ohmmeter should read OL.
If a short is indicated in both directions, or if an infinite
resistance is read in both directions, replace the diode.
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GEA01178
GEA01179
GEA01180