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TROUBLESHOOTING & REPAIR | |||
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SCR REMOVAL AND AND REPLACEMENT (continued)
FIGURE F.30 – HOUSING AND PRESSURE PAD FOR 5/8” WIDE LEAF SPRING
Steel Pressure Pad
Housing
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B. PROCEDURE FOR THE 5/8 INCH WIDE SPRING:
1)Place a piece of sleeving around each cap screw.
2)Insert the 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” wide standoff facing up. See Figure 30.
4)Insert the cap screws and leaf spring into the plastic housing. Be sure that the steel pressure pad remains in position. Pressing on the cap screw heads should pro- duce a rocking action of the spring in its housing.
5)Insert the clamp assembly through the heat sinks. Install the 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 31.
6)
7)Clamp the cap screws. Use the procedure for
Clamping procedure for
a.Do not turn the nuts. While holding the nuts stationary, turn the cap screws only with the following procedure.
b.Tighten first cap screw 1/4 turn.
c.Tighten second cap screw 1/2 turn.
d.Tighten first cap screw 1/2 turn.
e.Tighten second cap screw 1/2 turn.
f.Tighten first cap screw 1/2 turn.
g.Tighten second cap screw 1/4 turn. Stop. The assembly now has the proper clamping force.
SQUARE WAVE TIG 355
