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PRECISION TIG 185
F-40 F-40
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TROUBLESHOOTING AND REPAIR
SCR BRIDGE ASSEMBLY
REMOVAL AND REPLACEMENT PROCEDURE (Continued)
PROCEDURE
1. Remove input power to the TIG 185
machine.
2. Using the 3/8” nutdriver remove the
case wrap-around cover.
3. With the slot head screwdriver
loosen the input cable strain relief to
allow movement of case back.
4. Using the 3/8” nutdriver remove the
two lower screws from the case back.
See Figure F.7.
5. With the 5/16” nutdriver remove the
two screws holding the case back to
the internal divider panel. See Figure
F.7.
6. Remove the gas hose from the gas
solenoid valve.
7. Carefully pull the case back and fan
assembly away to allow access to
the SCR Bridge Assembly. Support
the case back so as not to stress the
fan motor leads. It is not necessary
to disconnect the fan motor leads.
8. Using the 5/16” nutdriver remove the
two screws holding the front panel
assembly to the base. See Figure
F.8.
FIGURE F.7 CASE BACK MOUNTING SCREWS
REAR PANEL
MOUNTING
SCREWS