Lincoln Electric NA-5NF, NA-5SF service manual Return to Section Return to Section TOC

Models: NA-5S NA-5N NA-5SF NA-5NF

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F-44

TROUBLESHOOTING & REPAIR

F-44

 

 

T1 and T2 TRANSFORMER TEST (Continued)

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7.Check for approximately 22VAC at the blue secondary leads. The blue secondary leads are connected to the logic board. See wiring diagram.

8.Check for approximately 18VAC at the white to red leads. The white and red leads are connected to the power board. See wiring diagram.

9.Check for approximately 36VAC at the red to red leads. Both red leads are also connected to the power board. See wiring diagram.

10.If all the secondary voltages are correct the T1 transformer is func- tioning properly.

11.If any or all of the secondary volt- ages are low or not present the T1 transformer may be faulty.

12.Using the 115VAC supply carefully apply 115VAC to the T2 primary leads #531B and #532.

13.Check for approximately 115VAC at the orange secondary leads. The orange leads are connected to the power board. See wiring dia- gram.

14.Check for approximately 24VAC at the brown secondary leads. See wiring diagram.

15.If all the secondary voltages are correct the T2 transformer is func- tioning properly.

16.If any or all of the secondary volt- ages are low or not present the T2 transformer may be faulty.

17.Reconnect the primary leads (#531B and #532) to the TS2 termi- nal strip.

18.Close and secure the access door.

NA-5

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Lincoln Electric NA-5NF, NA-5SF service manual Return to Section Return to Section TOC