Tweco 51 with SL100SV CutMaster - Manual (Page 87)

Manual 0-4640 5-23 SERVICE
5
F. Gas flows; No arc in torch; AC , GAS , and DC indicators ON; TEMP indicator off
1. Faulty IGBT
a. Measure between the following points on the Main PC Board:
• E4 to E10
• E10 to E20
Voltage should be approximately 20 vdc before the start signal is active. If voltage measures greater than 100 vdc
when the start signal is active, replace the IGBT.
Art #A-04220
IGBT
Output
Diode
E4
E20 E10
Main PC Board Layout (IGBT Test Points)