Tweco 400 MST Arc Master - Manual (Page 61)

400MST
9
ADVANCED TROUBLESHOOTING
9 – 24
6) Remove five screws, three terminals, and five connectors from PCB2 (WK-5597).
7) Cut off one snap band. Remove two board supports and then remove PCB2 (WK-5597) and the insulat-
ing sheet.
2.4.3 PCB3 (WK-5548), PCB7 (WK-5689) 
1) Remove the side cover. [Reference page: 9-1]
2) Remove PCB4 (WK-4819). [Reference page: 9-26]
3) Remove PCB6 (WK-5688). [Reference page: 9-27]
4) Remove PCB5 (WK-5696). [Reference page: 9-26]
5) Disconnect 11 connectors from PCB3 (WK-5548).
CN2
CN4
CN1
CN3
CN5
CN23
CN11
CN3
CN2
CN1
CN9
CN22
CN21
CN20
CN7
CN8