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TROUBLESHOOTING
41
Troubleshooting:
F3: MAG CURR (Magnetron Current Low)
Replace K6 relay
(see pages A-5
through A-6).
YES
Run test cook
cycles to see if fault
repeats (page 10).
If not, clear faults.
Did fault repeat?
NO
Are the F3 and F4 fuses
functioning properly?
YES
Replace the F3
and/or F4 fuse (see
pages A-5 through
A-6) and verify the
operation of the
interlock switches
(page 26).
Check the condition of the
F3 and F4 fuses (pages 42,
A-5 through A-6). Are they
12-amps?
YES
Replace the
diode(s). See page
A-7 through A-8.
Replace the
capacitor(s).
See page A-7
through A-8.
NO
YES
NO
Replace the
magnetron(s).
See page A-12
through A-13.
YES
NO
Replace the HV
transformers(s).
See page A-7
through A-8.
Test the high-voltage diodes
(page 30). Are the diodes
functioning properly?
NO
Replace the filament
transformers(s). See
page A-7 through A-8.
YES
Replace the
control board.
See page A-8.
Test the filament transformers
(page 30). Are the filament trans-
formers functioning properly?
U.S.
Intl.
Is the K6 mechanical
relay in good working
order?
YES
YES
NO
Is control board
detecting 10A or
more current? Test
for 24 VDC on pin
2 of J7 connector
(page 51).
NO
Is amperage present at the
current transformer even
if the control board is not
detecting it?
YES
Replace the
control board.
See page A-8.
Test the high-voltage
transformers (page 30). Are the
high voltage transformers
functioning properly?
Test the magnetron for an
open/shorted filament (page
32). Are the filaments
functioning properly?
Is the oven U.S. or International?
NO
NO
YES
YES
NO
Test the capacitors (page 29).
Are the capacitors
functioning properly?