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TROUBLESHOOTING & REPAIR
F-57 F-57
SQUARE WAVE TIG 275
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MAIN TRANSFORMER AND OUTPUT CHOKE ASSEMBLY
REMOVAL AND REPLACEMENT (continued)
20. Using the 3/8” wrench, remove the two
screws holding the left side panel to the base
of the machine. See
Figure F.18.
21. With the 1/2” wrench, disconnect the shunt
assembly from the choke lead.
22. Carefully slide the panel away from the
transformer about two inches.
23. Remove the left side choke glastic baffle.
24. Remove leads #314 and #316 from the
choke thermostat. See the Wiring Diagram.
25. Remove lead #315 and #316 from the X1
secondary lead thermostat. See the Wiring
Diagram.
26. Disconnect the primary thermostat lead
splices #313 and #315. See the Wiring
Diagram.
27. With the 9/16” wrench, remove the four nuts
from the transformer mounting studs. See
Figure F.18.
28. Carefully lift the transformer and choke
assembly from the machine base. Clear all
leads.
FIGURE F.19 – POLARITY SWITCH CONNECTIONS
253
X1
MICRO SWITCH
LEADS
B
POS
NEG
CHOKE