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PRECISION TIG 185
F-41 F-41
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TROUBLESHOOTING AND REPAIR
SCR BRIDGE ASSEMBLY
REMOVAL AND REPLACEMENT PROCEDURE (Continued)
9. Remove plug J2 from the control
board. (See Figure F.9.) Also
remove plug and lead harness from
internal divider panel.
10. Carefully slide the internal divider
panel away a few inches to allow
access to the SCR bridge assem-
bly.
11. Using the 7/16” wrench disconnect
the diode pigtail connection from the
polarity switch lead. See Figure
F.10. Cut any necessary cable ties
and remove insulating sleeving.
Note placement of sleeving and cable
ties for reassembly.
12. Using the 7/16” wrench remove the
X2 secondary transformer lead from
the left side AC SCR heat sink.
13. With the 7/16” wrench remove the
shunt from the SCR bridge left side
negative heat sink.
14. Using the 7/16” wrench remove the
polarity switch lead from the right
side AC SCR heat sink.
15. Using the 7/16” wrench remove the
positive lead from the right side
positive heat sink.
FIGURE F.8 FRONT PANEL MOUNTING SCREWS
FRONT PANEL
MOUNTING
SCREWS