Tweco 400 MST Arc Master - Manual (Page 64)

400MST
9
ADVANCED TROUBLESHOOTING
9 – 27
2.4.6 PCB6 (WK-5688) 
1) Remove the side cover. [Reference page: 9-1]
2) Disconnect five connectors.
3) Remove three screws and disconnect six connectors, and then remove PCB6 (WK-5688).
2.4.7 PCB8 (WK-5479) and PCB9 (WK-5479) 
1) Remove the side cover. [Reference page: 9-1]
2) Remove eight screws and four component clips. Disconnect four connectors and remove six screws,
and then remove PCB8 (WK-5479) and PCB9 (WK-5479).
 When reinstalling, remember to install new silicon rubber sheets.
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Silicone Rubber Sheet