Lincoln Electric INVERTEC SVM101-B Service Manual page 69

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OVERVOLTAGE PROTECTION DC TRIGGER CIRCUIT TEST (cont.)
TEST PROCEDURE
1. Turn main power OFF.
2. Perform Input Filter Capacitor Discharge procedure
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.
TROUBLESHOOTING & REPAIR
FIGURE F.16 - PC BOARDS REMOVED
V300-I
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