Tweco 400 MST Arc Master - Manual (Page 70)

400MST
9
ADVANCED TROUBLESHOOTING
9 – 33
5) Remove the three screws and the bus bar from the PCB16 (WK-4917).
2.4.14 PCB17 (WK-5699) 
1) Remove the side cover. [Reference page: 9-1]
2) Disconnect 11 connectors and remove one terminal. Remove four screws and remove PCB17 (WK-
5699).
2.4.15 PCB18 (WK-5499) 
1) Remove the side cover. [Reference page: 9-1]
2) Remove PCB17 (WK-5699). [Reference page: 9-33]
3) Remove one screw and one terminal. Remove one bolt, one toothed washer, one washer, and one ter-
minal. Disconnect one connector. Remove one screw and one nut and detach the bus bar.
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