Troubleshooting & repair, Scr removal and replacement (continued) – Lincoln Electric IDEALARC R3R-500 User Manual
Page 84
TROUBLESHOOTING & REPAIR
F-50
F-50
IDEALARC R3R
SCR REMOVAL AND REPLACEMENT (continued)
PROCEDURE FOR THE
5/8 INCH WIDE SPRING
1. Place a piece of sleeving around each cap
screw.
2. Insert cap screws through the leaf spring.
The leaf spring is flat so the orientation of the
leaf spring does not matter.
3. Place the steel pressure pad in the housing
with the 1/8 inch wide standoff facing up.
See Figure F.31.
4. Insert cap screws and leaf spring into plastic
housing being sure that the steel pressure
pad remains in position. Pressing on the cap
screw heads should produce a rocking action
of the spring in its housing.
5. Insert the clamp assembly through the heat
sinks. Install nuts. Tighten the clamp nuts
equally on the cap screws until finger tight.
Be sure that the leaf spring is not cocked in
the housing. See Figure F.32. Heat sinks
may not be exactly as pictured.
6. Reinspect the SCR for proper seating.
FIGURE F.31 – HOUSING AND PRESSURE PAD FOR 5/8” WIDE LEAF SPRING
FIGURE F.32 – CLAMP ASSEMBLY
HEX NUT
HEAT SINK
SCR
HEAT SINK
HOUSING
LEAF SPRING
CAP SCREW
STEEL PRESSURE PAD
HOUSING