Lincoln Electric IDEALARC CV-300 Service Manual page 79

F-40
SCR REMOVAL AND REPLACEMENT (CONTINUED)
CLAMPING PROCEDURE FOR
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
the nuts stationary, turn the cap
screws only with the following pro-
cedure.
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 1/4 turn.
7. Assembly now has proper clamping
force.
8. Perform the 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-
cedure.
2. Tighten first cap screw 1/4 turn.
TROUBLESHOOTING & REPAIR
IDEALARC CV-300
3. Tighten second cap screw 1/2 turn.
4. Tighten first cap screw 1/2 turn.
5. Tighten second cap screw 1/4 turn.
STOP.
6. Assembly now has the proper
clamping force.
7. Perform the Active SCR Test.
F-40