Tweco 400 MST Arc Master - Manual (Page 60)

400MST
9
ADVANCED TROUBLESHOOTING
9 – 23
2.4.2 PCB2 (WK-5597) 
1) Remove the side cover. [Reference page: 9-1]
2) Remove PCB6 (WK-5688). [Reference page: 9-27]
3) Remove one screw and three ground terminals. Disconnect 13 connectors.
4) Loosen two screws. Rotate the resistors (R2 and R3) to expose two screws on PCB3 (WK-5548).
5) Disconnect five connectors.
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