Lincoln Electric INVERTEC SVM129-B Service Manual page 62

F-24
T4 AUXILIARY TRANSFORMER TEST (continued)
TEST POINTS
PLUG J13 PINS 5 TO 6
PLUG J13 PINS 2 TO 3
PLUG J22 PINS 1 TO 2
(LEADS 240 TO 241)
PLUG J22 PINS 2 TO 9
(LEADS 241 TO 242)
PLUG J22 PINS 3 TO 4
(LEADS 243 TO 244)
PLUG J22 PINS 12 TO 13
(LEADS 245 TO 246)
13. Check the secondary AC voltages accord-
ing to Table F.2.
14. With the correct 115VAC applied to the pri-
mary winding (#32 to #33), if any or all of
the secondary voltages are missing or low,
the T4 auxiliary transformer may be faulty.
Replace the T4 auxiliary transformer.
TROUBLESHOOTING & REPAIR
TABLE F.2 – T4 AUXILIARY TRANSFORMER VOLTAGES
INVERTEC STT
NORMAL VOLTAGES
6VAC
10VAC
18VAC
18VAC
18VAC
18VAC
15. After all tests are completed, reconnect the
following:
Leads #32A, #32B, #33A, #33B to the
T4 transformer tabs
Plug J13 to the IGBT drive board
Plug J22 to the wiring harness
Reinstall lower tray assembly using
7/16" wrench and 5 bolts
Plug J1 to the control PC board
Reconnect lead splice from the output
choke to the IGBT module. Reposition
insulating sleeve.
16. Install the case wraparound cover.
F-24