Troubleshooting & repair, Scr output bridge replacement – Lincoln Electric IDEALARC DC 1000 SVM123-A User Manual
Page 94
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TROUBLESHOOTING & REPAIR
7.
Using a 3/8” socket wrench, attach
the two screws (one on each side)
holding the SCR assembly rails to
the front panel assembly. See
Figure F-23.
NOTE: It may have been necessary to
move or remove the output choke to
gain access to the bottom anode leads.
For access to the bottom middle screw,
nut, and associated washers, a long
handled flat ratchet is recommended.
8.
Using a 1/2” socket and open-end
wrench, attach the secondary leads
that connect the anodes of the SCR
heat sink assemblies to the six
transformer secondary (heavy alu-
minum) leads as labeled during dis-
assembly.
9.
Using a 5/16” socket attach the
small reed switch lead (#210) to the
left, top rear SCR heat sink using
the screw previously removed.
10. Using a 9/16” socket and open-end
wrench, attach the two bolts and
nuts holding the shunt assembly to
the two positive buss leads con-
nected to the SCR bridge.
11. Feed the J4 gate lead Molex plug
up through the hole in bottom of the
PC board compartment. Attach the
plug onto the firing board.
12. Secure any cable ties removed pre-
viously to allow for the SCR bridge
assembly removal.
13. Using a 5/16 (8mm) nut driver or
flat head screw driver, attach 20
screws (ten per side) to attach the
case sides. Attach the top using 2
similar screws.
14. Raise the front control panel into
position, and, using a 5/16 (8mm)
nut driver or flat head screw driver,
secure in position using 6 screws.
SCR OUTPUT BRIDGE REPLACEMENT
IDEALARC DC-1000
F-54