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POLARITY SWITCH
REMOVAL AND REPLACEMENT PROCEDURE (continued)
REPLACEMENT PROCEDURE
1. Carefully position the new polarity switch in
position on the front panel. Make certain the
micro-switch is assembled to the polarity switch
correctly.
2. Solder leads #311 and #312 to the micro -
switch.
3. Assemble and tighten the two nuts and washers
that hold the polarity switch to the front panel.
4. Assemble the X1 secondary lead to the polarity
switch. Make certain washers are in place and
the nut is tight.
5. Assemble the choke lead to the polarity switch.
Make certain washers are in place and the nut
is tight.
6. Assemble the flat copper leads to the polarity
switch. Make certain they are connected to the
proper terminals and the nuts are tightened.
7. Assemble the flex lead from diode D1 to the
rear gang of the polarity switch. Make certain
washers are in place and the nut is tight.
8. Assemble the flex lead from the AC bridge
plate to the polarity switch. Make certain
washers are in place and the nut is tight.
9. Assemble the “positive” flex lead to the polarity
switch. Make certain washers are in place and
the nut is tight.
10. Clear the leads and check for “shorted” or
“grounded” leads.
11. Position the name plate and fasten to the front
with the previously removed snap rivets.
12. Assemble the polarity switch handle in place
with the Phillips head screw and check for cor-
rect switch operation.
13. Using the Allen type wrench replace the output
control knob.
14. Replace the case wrap-around cover.
TROUBLESHOOTING AND REPAIR
F-47 F-47
PRECISION TIG® 225
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