Lincoln Electric INVERTEC V300-PRO SVM105-B Service Manual page 50

F-20
PROTECTION BOARD OUTPUT TEST(cont.)
306
275F
TEST PROCEDURE
12. Open S4 and Turn Power OFF
13. Move probes to test between leads 306 (+) and
275 (-). (See Figure F.6)
14. Turn Power ON and close S4. If voltage is less
than 1 VDC, Protection Board is OK. If voltage is
greater than 14 VDC, Protection Board may be
defective.See Overvoltage Protection DC
Trigger Circuit test, Step11.
TROUBLESHOOTING & REPAIR
FIGURE F.6 - INSERTING PROBES
L7915
PROTECTION
313
J8
311
V300-PRO
F-20
J15