TurboChef i3 Service Manual page 61

Energize the mag-
netron circuit from
Test Mode (page 16).
Are there 10+ amps
present on the current
transformer wire,
located on the control
board?
YES
Run test cook
cycles to see if fault
repeats (page 10).
If not, clear faults.
Did fault repeat?
YES
NO
NO
Remove and inspect the
magnetrons for discolored
antennas or waveguide
contaminants.
Any defects found?
Energize the magnetron circuit
from Test Mode (page 16) and
test for control voltage to the
anode relay. Is 24 VDC present
on pins C-17 and C-14 on the
control board?
Energize the magnetron circuit
from Test Mode (page 16) and
test for control voltage on the
K2 anode relay. Is 24VDC
present on terminals A+B?
Inspect/Replace
wiring between C-17,
C-14 of the control
board and terminals
A+B of the K2 relay.
Troubleshooting:
F3: MAG CURR (Magnetron Current Low)
Intl.
Is the oven International or U.S.?
Confirm the F3 fuse is a
NO
20-amp ATMR fuse. Is it
open/blown?
YES
Are 10+ amps present
during the F3 fault
alarm?
YES
Replace affected
components.
Reinstall all
components and
place the oven
back in service.
Replace the
control board.
NO
YES
Is voltage leaving the K2
anode relays on terminals
YES
4+6?
NO
Inspect/Replace wiring between
K2 relay terminal 4 and T1-1
and between K2 relay terminal
6 and T2-3 (U.S.) / T2-2
(International) on the high-
voltage transformers.
Replace the F3 fuse and
verify the operation of
YES
the interlock switches
(page 24).
NO
Is primary voltage present at the
high-voltage transformers (page 28)?
NO
Replace the
control board.
Replace the
high-voltage
NO
transformer(s).
NO
Replace the
filament
transformer(s).
NO
Replace the
capacitor(s).
NO
Replace the
high-voltage
diode(s).
NO
YES
NO
Is the K6 mechanical
relay in good working
U.S.
order?
YES
NEVER TEST SECONDARY
VOLTAGES
YES
Test the high-voltage transformers
(page 28). Are the transformers
functioning properly?
YES
Test the filament transformers
(page 28). Are the filament
functioning properly?
YES
Test the capacitors (page 27). Are
the capacitors functioning properly?
YES
Test the high-voltage diodes (page
29). Are the high-voltage diodes
functioning properly?
Replace the K2
Replace the
anode relay.
magnetron(s).
39
NO
Replace K6
relay.
YES