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F-46

F-46

TROUBLESHOOTING & REPAIR

8.Check for the presence of +5 VDC on the control board.

a.LED2 should be lit when +5 VDC is pre- sent. See Figure F.14. See Control Board LED Definitions and Figure F.12, Low

Voltage Circuit Diagram.

9.Check for the presence of +15 VDC being applied to the display board from the control board. You may have to remove the display board to check it.

a.+15 VDC should be present at leads #216(+) to #219(-). See Figure F.15 and

Figure F.12, Low Voltage Circuit Diagram.

10.If any of the DC supply voltages are incorrect or missing, make certain the correct AC sup- ply voltages are being applied to the P.C. boards. See Figure F.12, Low Voltage Circuit Diagram and (T2) Auxiliary

Transformer Test.

11.When the test is complete, remove input power and replace the case wraparound cover.

PRO-CUT 55

Page 83
Image 83
Lincoln Electric SVM140-A service manual Figure F.12, Low Voltage Circuit Diagram