Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B Service Manual page 86

F-26
CAPACITOR DISCHARGE PROCEDURE (continued)
11. Check the voltage across terminals #9 and
#12 with the DC voltmeter. Terminal #9
has positive polarity and terminal #12 has
negative polarity. Voltage should be zero.
If any voltage remains, repeat this capaci-
tor discharge procedure.
TROUBLESHOOTING & REPAIR
FIGURE F.4 - RESISTOR WITH LEADS CONNECTED.
POWER WAVE 450
12. Repeat discharge procedure steps 9, 10,
and 11 for each of the other three switch
boards of the FET or IGBT switch board
assembly.
F-26