TurboChef ENCORE Service Manual page 61

Energize the mag-
netron circuit from
Test Mode (page 19).
Are there 10+ amps
present on the cur-
rent transformer wire,
located on the control
board?
YES
run test cook
cycles to see if YES
fault repeats
(page 10). If
not, clear faults.
No
Did fault repeat?
remove and inspect the
magnetrons for discolored
antennas or waveguide
contaminants. Were any
defects found?
YES
No
reinstall all
replace
parts and
affected
place the
parts.
oven back in
service.
Energize the magnetron
circuit from Test Mode
(page 19) and test for
control voltage on the
K2 anode relay. Is 24
VDC present on
terminals A+b?
YES
Is voltage leaving the K2
anode relay on terminals
4+6?
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
open/blown?
Are 10+ amps present
during the F3 fault
alarm?
YES
Energize the mag-
netron circuit
from Test Mode
(page 19) and test
for control voltage
to the K2 anode
relay. Is 24 VDC
present on pins
b-17 and C-14 on
the control board?
YES No
replace the
control board.
Inspect/replace wir-
ing between b-17,
No
C-14 of the control
board and terminals
A+b of the K2 relay.
Inspect/replace wiring between terminal 4 (K2) and
T1-1 (HV transformer), and between terminal 6
(K2) and T2-3 (HV transformer; uS 240 VAC) /
T2-2 (HV transformer; uS 208 VAC or Intl.).
YES
No replace the K2 anode relay.
u.S.
replace the F3 fuse and
YES
fuse. Is it
verify the operation of the
switches (page 25, section
"Interlock Switches").
No
Is primary voltage present at the
high-voltage transformers (page
No
28)? NEVEr TEST SECoNDArY
replace the
VoLTAGES
control board.
Test the high-voltage transformers
for primary and secondary winding
resistance (page 28). Are they
functioning properly?
YES
Test the filament transformers
(page 28). Are they functioning
properly?
YES
Test the capacitors (page 27).
Are they functioning properly?
YES
Test the high-voltage
diodes (page 29). Are
they functioning and
wired properly?
Is the K6 mechanical
relay in good working
order?
YES
No YES
replace the
No high-voltage
transformers.
replace the
No
filament
transformers.
replace the
No
capacitor(s).
replace the
high-voltage
No
diode(s).
replace the
YES
magnetron(s).
39
No
replace
K6 relay.