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Magnetron Does Not Work
1
2
1 - Red
2 - White
3 - Blue
4 - Black
3
4
2
Replace the HV transformer.
Does the magnetron work?
Replace the magnetron.
Replace the primary interlock switch or repair
faulty wiring between the HV transformer and
the primary interlock switch.
Does continuity exist between the HV
transformer black wire and power cord with
primary interlock closed (door closed)?
No
Yes
Does continuity exist between the HV
transformer blue wire and secondary interlock-2
blue wire thru HV transformer fuse?
Replace the HV transformer fuse or
repair faulty wiring.
No
Yes
No
Does continuity exist between the secondary
interlock-2 blue wire and power cord?
Repair faulty wiring.
No
Yes
Does continuity exist between the HV
transformer white wire to power cord thru
secondary interlock - 1 (door closed) and
monitor interlock switch open (door closed)?
Yes
Repair faulty wiring.
No
Replace the main control board.
Does the magnetron work?
No
Replace the HV capacitor.
Does the magnetron work?
No
