Tweco 400 MST Arc Master - Manual (Page 77)

400MST
9
ADVANCED TROUBLESHOOTING
9 – 40
2.4.24 Diode (D2, D3, D4, and D5) 
1) Remove the side cover. [Reference page: 9-1]
2) Remove PCB17 (WK-5699). [Reference page: 9-33]
3) Remove PCB15 (WK-5606). [Reference page: 9-31]
4) Remove one screw and one nut. Remove 20 screws and one terminal and detach the bus bar.
5) Remove eight screws and remove the diodes (D2, D3, D4, and D5).
 When replacing the diode with a new one, apply an oil compound (SHINETSU SILICONE G-747 or
equivalent) evenly to the base.
 Pay attention to the installation direction of the diode.
1
1
2
2
2
2
4
D3
D5
D2
D4