3.33 Secondary Igbt (Q25-Q26) And Pcb18-Pcb19 - Thermal Arc ARCMASTER 300 AC/DC Service Manual

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.
3.33 Secondary IGBT (Q25-Q26) and PCB18-PCB19 
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.
1
2
3
3
2
1
1
CN1
CN1
12 – 32
12
300ACDC
D4
D7
D3
D6
D2
D5
2
MAINTENANCE