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PRECISION TIG 185
TROUBLESHOOTING & REPAIR
F-54 F-54
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MAIN TRANSFORMER AND OUTPUT CHOKE ASSEMBLY
REMOVAL AND REPLACEMENT PROCEDURE (Continued)
REMOVAL PROCEDURE
1. Remove input power to the TIG 185
machine.
2. Perform the SCR Bridge Assembly
Removal Procedure.
3. Unsolder the two 115VAC leads and
leads B231 and B232 from the main
transformer leads. Label leads for
reassembly. See wiring diagram.
4. Unsolder leads W201 and W204
from the main transformer leads.
Label leads for reassembly. See
wiring diagram.
5. Unsolder leads R209 and U210 from
the main transformer leads. Label
leads for reassembly. See wiring dia-
gram.
6. Using the 1/2” wrench remove the
shunt assembly from the choke lead.
7. With the 3/8” wrench remove the H1,
H2 or H3 lead from the input power
switch. See wiring diagram. Label
the leads and connection points for
reassembly. Cut any necessary
cable ties.
8. Remove plug J3 from the control
board and push through the interior
divider panel.
9. Using the 1/2” wrench remove the
choke lead from the polarity switch.
See wiring diagram. Label lead and
connection point for reassembly.
10. With the 1/2” wrench remove the X1
secondary lead from the polarity
switch. See wiring diagram. Label
lead and connection point for
reassembly.
11. With the 1/2” wrench remove the
four nuts and lock washers from the
transformer mounting bolts at the
base of the machine.
12. Carefully hoist the transformer/
choke assembly clear of the base.
Clear all leads.