Lincoln Electric INVERTEC SVM129-B Service Manual page 58

F-20
T4 AUXILIARY TRANSFORMER TEST (continued)
FIGURE F.3 – OUTPUT CHOKE/IGBT MODULE SPLICED CONNECTION
LOWER
TRAY
AREA
TEST PROCEDURE
1. Turn off the Invertec STT and disconnect
main AC input power to the machine.
2. Using the 5/16" nut driver, remove the case
wraparound cover.
3. Perform the
Discharge
Maintenance section.
TROUBLESHOOTING & REPAIR
Input Filter Capacitor
See the
Procedure.
INVERTEC STT
OUTPUT CHOKE/
DARLINGTON MODULE
SPLICED CONNECTION
WARNING
ELECTRIC SHOCK can kill.
• Before continuing with
the test procedure, per-
form the capacitor dis-
charge
avoid electric shock.
4. Locate the lead connection splice from the
output choke to the IGBT module. Remove
the insulating sleeve. Cut any necessary
cable ties. Using the 7/16" wrench, discon-
nect the lead splice. Thread the lower lead
down into the lower tray assembly area.
See Figure F.3.
F-20
procedure to