Lincoln Electric IDEALARC CV-300 Service Manual page 81

F-42
SCR REMOVAL AND REPLACEMENT (CONTINUED)
PROCEDURE FOR CLAMPING
1/4-28 BOLTS.
Note: This procedure can only be used
with 1/4-28 bolts.
Do not use bolts with any other type
thread or new SCR will be damaged.
Do not over tighten cap screws. The
leaf spring will apply the required
clamping force to the SCR.
1. Do not turn the nuts. While holding
nuts stationary, turn the cap screws
only with the following procedure.
2. Tighten first cap screw 1/4 turn.
3. Tighten second cap screw 1/2 turn.
4. Tighten first cap screw 1/2 turn.
5. Tighten second cap screw 1/2 turn.
6. Tighten first cap screw 1/2 turn.
7. Tighten second cap screw 1/4 turn.
8. Assembly now has the proper
clamping force.
9. Perform Active SCR Test.
CLAMPING PROCEDURE FOR
1/4-20 BOLTS.
Note: This procedure can only be used
with 1/4-20 bolts.
Do not use bolts with any other type
thread or new SCR will be damaged.
Do not over tighten cap screws. The
leaf spring will apply the required
clamping force to the SCR.
1. Do not turn the nuts. While holding
the nuts stationary, turn the cap
screws only with the following pro-
cedures.
2. Tighten first cap screw 1/4 turn.
TROUBLESHOOTING & REPAIR
IDEALARC CV-300
3 Tighten second cap screw 1/2 turn.
4. Tighten the first cap screw 1/2 turn.
5. Tighten the second cap screw 1/4
turn.
6. Tighten the first cap screw 1/8 turn.
7. Tighten the second cap screw 1/8
turn.
8. Assembly now has the proper
clamping force.
9. Perform the Active SCR Test.
F-42