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F-26

TROUBLESHOOTING & REPAIR

F-26

 

Observe all Safety Guidelines detailed throughout this manual

 

 

 

 

 

 

 

 

 

 

PROBLEMS

 

 

POSSIBLE AREAS OF

 

RECOMMENDED

 

 

(SYMPTOMS)

 

 

MISADJUSTMENTS(S)

 

COURSE OF ACTION

 

 

 

 

 

 

 

 

 

 

 

 

FUNCTION PROBLEMS

 

 

 

 

 

 

 

 

 

 

The set speed is adjustable and

1.

Check that the jumper plug is

1.

Remove the drive motor end cap

 

steady. The actual speed reading is

 

installed securely in the harness

 

and the tach cover plate from the

 

incorrect and or erratic.

 

 

receptacle near the voltage

 

end of the wire drive motor.

 

 

 

 

 

board. Codes below 8300 only.

 

Check to make sure the slotted

 

 

 

 

 

 

disc is secure and aligned and

 

 

 

2.

Check for loose or faulty connec-

 

rotates freely through the center

 

 

 

 

tions on leads #510A, #525A and

 

of the module pick-up.

 

 

 

 

 

#555 between the tach receptacle

 

 

 

 

 

 

 

and the control board.

2.

Perform the Tach Board

 

 

 

 

 

 

 

Feedback Test.

 

 

 

 

3. Check the tach cable from the

 

 

 

 

 

 

 

tach board to the tach receptacle.

3.

If the Tach Board Feedback

 

 

 

 

The shield in the cable should

 

Test is OK the control board may

 

 

 

 

NOT be grounded to the case.

 

be faulty. Replace.

 

 

 

 

 

 

 

 

 

 

 

 

 

1.

Check the voltage sensing leads

 

The set volts and actual volts read-

1.

Put the Lincoln power source in

 

for continuity. (zero ohms). #21

 

ings match within a few tenths of a

 

the machine control mode.

 

should have continuity to the

 

volt while welding. However both

 

Check to see if the power supply

 

work piece and #67 should have

 

readings are inaccurate.

 

 

can be set for the arc voltage

 

continuity to the wire feed head

 

 

 

 

required for the process. If not,

 

assembly. See wiring diagram.

 

 

 

 

the power source may be faulty.

 

 

 

 

 

 

 

 

2.

Perform the Voltmeter Accuracy

 

 

 

2.

The control cable may be faulty.

 

Test.

 

 

 

 

 

Check or replace.

 

 

 

 

 

 

 

 

3.

Perform the Meter Circuit

 

 

 

 

 

 

 

Accuracy Test.

 

 

 

 

 

 

4.

The voltage board may be faulty.

 

 

 

 

 

 

 

 

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.

NA-5

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Lincoln Electric NA-5SF, NA-5NF service manual Feedback Test, If the Tach Board Feedback, Perform the Voltmeter Accuracy

NA-5S, NA-5N, NA-5SF, NA-5NF specifications

The Lincoln Electric NA-5NF, NA-5SF, NA-5N, and NA-5S are advanced welding helmets that are pivotal in enhancing the safety and efficiency of welders in various applications. These models are designed to provide exceptional protection and visibility, making them indispensable tools in the welding industry.

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