Tweco 400 MST Arc Master User Manual
Page 62
400MST
9
ADVANCED TROUBLESHOOTING
9 – 25
6) Loosen two screws. Rotate the resistors (R2 and R3) to expose two screws on PCB3 (WK-5548).
7) Remove one screw and three ground terminals. Remove four screws and remove PCB3 and PCB7. Dis-
connect five connectors from PCB7 (WK-5689).
8) Disconnect one connector and remove two screws and then remove PCB7 (WK-5689) from PCB3 (WK-
5548). Remove one screw and one ground terminal from PCB7 (WK-5689).
1
2
CN16
3
CN1
CN2
CN15
CN13
1
2
CN20
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