CIGWELD TRANSTIG 300 AC/DC, Service Manual, Page: 110 / 134

1
4
MAINTENANCE
5 ) Remove the 12 screws and then detach the secondary diodes (D2, D3, D4, D5, D6, D7).
Do not have the wrong direction of the diodes when reinstalling.
Before installing a new diodes, apply a uniform coat of silicone compound (Shinetsu Silicone G-747 or
equivalent) on the base.
14.
3.33 Secondary IGBT (Q25-Q26) and PCB18-PCB19
UV\
1 ) Remove the Side Panel. [Reference page : 11-1]
2 ) Remove the PCB16 (WK-5569). [Reference page : 12-16]
3 ) Remove the PCB20 (WK-5499). [Reference page : 12-17]
4 ) Remove the PCB17 (WK-5570). [Reference page : 12-16]
5 ) Remove the hall current sensor (HCT1). [Reference page : 12 -29]
6 ) Remove the one screw and one post, remove the bus bar.
7 ) Remove the two connectors and four screws. Remove the two secondary IGBT (Q25, Q26).
Before installing a new IGBT, apply a uniform coat of silicone compound (Shinetsu Silicone G-747 or
equivalent) on the base.
D2
D3
D4
D5
D6
D7
2
1
1
1
2
2
3
3
CN1
CN1
SERVICE MANUAL TRANSTIG 300 AC/DC
14-32 June 30, 2008