TurboChef i3 Service Manual

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

TurboChef i3 Specifications

General

Model	i3
Cooking Chamber	Stainless Steel
Cavity Dimensions	14.5 x 16 x 10 inches
Power Requirements	208-240V, 30A
Control Type	Touchscreen