Lincoln Electric INVERTEC V300-PRO SVM105-B - Manual (Page 69)

V300-PRO
TROUBLESHOOTING & REPAIR
TEST PROCEDURE
1. Turn main power OFF.
2. Perform Input Filter Capacitor Discharge proce-
dure detailed in Maintenance section.
3. Detach the following PC boards so you can gain
access to and have ample room to perform the
tests: (Do not disconnect from wiring harness.)
• Control Board
• Protection Board
• Power Board
NOTE: Do not disconnect any wires. The machine
must be functional to perform tests.
4. Arrange the PC boards and wiring so you can easi-
ly perform the tests.
NOTE: Do not allow live connections to touch each
other.
5. Turn main power ON.
6. Move the Output Terminal Switch S4 to the ON posi-
tion (closed).
F-39 F-39
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OVERVOLTAGE PROTECTION DC TRIGGER CIRCUIT TEST (cont.)
FIGURE F.16 - PC BOARDS REMOVED