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TROUBLESHOOTING AND REPAIR
SCR BRIDGE ASSEMBLY
REMOVAL AND REPLACEMENT PROCEDURE (Continued)
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PROCEDURE
1.Remove input power to the TIG 185 machine.
2.Using the 3/8” nutdriver remove the case
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.
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FIGURE F.7 CASE BACK MOUNTING SCREWS
REAR PANEL
MOUNTING
SCREWS
