Lincoln Electric IDEALARC DC-600 Service Manual page 100

F-56
REMOVAL AND REPLACEMENT PROCEDURE (continued)
5. Remove the bolt that connects the Shunt
Assembly (heavy copper) lead to the SCR
Bridge Assembly. The Shunt Assembly con-
nects the positive Weld Output Terminal to the
SCR Bridge Assembly.
6. Remove the small snubber lead from the left
hand (facing the front of the machine) rear
heat sink mounting bolt using a 1/2" socket
wrench.
7. Clear all leads from any obstructions.
TROUBLESHOOTING AND REPAIR
SCR / SCR OUTPUT BRIDGE
IDEALARC
8. Lift the SCR Bridge Assembly straight up and
out of the machine being sure that no leads
become tangled or hooked on the other
machine parts.
a. Be sure to locate the SCR Bridge
Assembly on a stable work surface capa-
ble of holding the weight of the assembly.
9. Remove individual SCR Heat Sinks following
the procedure described in A above.
10. Replace all insulating materials, including the
insulators on the frame rail and all insulating
tubes, when installing the SCR Output Bridge
Assembly.
11. The Output Bridge assembly should be electri-
cally isolated from ground. Check with an ana-
log ohm meter. Minimum resistance is
500,000 ohms to ground.
® DC-600
F-56