Tweco 400 MST Arc Master - Manual (Page 68)

400MST
9
ADVANCED TROUBLESHOOTING
9 – 31
6) Remove two screws from PCB1 (WK-5477) and disconnect three terminals. Cut off two snap bands and
slide the insulating tube. Remove two screws, two nuts, and four terminals.
7) Remove four screws from the bottom and disconnect one terminal. Remove two screws from the rear
side and remove PCB14 (WK-5594) by pulling it out. Remove four screws and detach the bus bar.
2.4.12 PCB15 (WK-5606) 
1) Remove the side cover. [Reference page: 9-1]
2) Remove PCB17 (WK-5699). [Reference page: 9-33]
3) Remove the sheet and remove eight screws. Remove two board supports and remove PCB15 (WK-
5606).
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