Lincoln Electric NA-5SF, NA-5NF service manual Perform the #21-#67 External, ResistanceTest

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

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F-10

TROUBLESHOOTING & REPAIR

F-10

 

Observe all Safety Guidelines detailed throughout this manual

 

 

 

 

 

 

 

 

 

PROBLEMS

 

 

POSSIBLE AREAS OF

 

RECOMMENDED

 

(SYMPTOMS)

 

 

MISADJUSTMENTS(S)

 

COURSE OF ACTION

 

 

 

 

 

 

 

 

 

 

WIRE FEEDING PROBLEMS

 

 

 

 

 

 

 

 

 

NA-5 units above code 8300 with

1.

Check the 1/8 amp fuse on the

1. Perform the #21-#67 External

 

“cold starting”.

 

 

voltage board. Replace if faulty.

 

ResistanceTest.

 

 

While pressing the inch down button

 

 

 

 

 

 

the wire does not stop when it touch-

2.

While pressing the inch down but-

2.

Check the continuity of leads

 

es the work.

 

 

ton with the wire touching the

 

#667 and #621 to the voltage

 

 

 

 

work piece, observe light 7G on

 

board. See wiring

diagram.

 

 

 

 

the logic board. If the light goes

 

 

 

 

 

 

 

on but the wire does NOT stop

3.

The logic board may be faulty.

 

 

 

 

feeding the logic board may be

 

 

 

 

 

 

 

faulty.

4.

The voltage board may be faulty.

 

 

 

 

 

 

 

The wire will NOT inch up but does

1.

With the unit at idle (no buttons

1.

Check the inch up switch (button)

 

inch down and weld properly.

 

pressed) observe lights 1D, on

 

for proper operation. Also check

 

 

 

 

the power board, and light 7E, on

 

associated leads for loose or

 

 

 

 

the logic board. 1D should be

 

faulty connections. See wiring

 

 

 

 

ON. 7E should be OFF.

 

diagram.

 

 

 

 

2.

If 1D is OFF replace the power

 

 

 

 

 

 

 

board.

 

 

 

 

 

 

3.

If 7E is ON replace the logic

 

 

 

 

 

 

 

board.

 

 

 

 

The wire feeds UP when either inch

1.

While pressing the inch down but-

1. Check the inch up and inch down

 

button is pressed.

 

 

ton observe light 7E on the logic

 

switches (buttons) for proper oper-

 

 

 

 

board. It should be ON.

 

ation and wiring. See wiring dia-

 

 

 

 

 

 

gram.

 

 

 

 

2.

If light 7E is ON, while the inch

 

 

 

 

 

 

 

down button is pressed, the

 

 

 

 

 

 

 

power board may be faulty.

 

 

 

 

 

 

 

Replace.

 

 

 

 

 

 

3.

If light 7E remains OFF, while

 

 

 

 

 

 

 

the inch down button is pressed,

 

 

 

 

 

 

 

the logic board may be faulty.

 

 

 

 

 

 

 

Replace.

 

 

 

 

 

 

 

 

 

 

 

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 Perform the #21-#67 External, ResistanceTest

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.

One of the main features of the NA-5 series is the auto-darkening filter technology. This feature allows the helmet to automatically adjust its shade based on the intensity of the arc. As the welder strikes an arc, the lens darkens instantaneously, shielding the eyes from harmful rays generated during the welding process. This functionality not only ensures safety but also enhances productivity, as welders do not need to manually flip the helmet up and down.

The helmets are equipped with a wide viewing area that allows for better visibility and precision while working. With a large lens, welders can easily monitor their work and surrounding environment, minimizing the risk of accidents. Additionally, the lightweight design of the NA-5NF, NA-5SF, NA-5N, and NA-5S provides comfort during extended periods of use, reducing neck strain and fatigue.

The NA-5 series is also well-regarded for its durability. Constructed from impact-resistant materials, these helmets can withstand the rigors of demanding work environments. This durability extends the lifespan of the helmet, making it a cost-effective investment for both professional and hobbyist welders.

Another notable characteristic is the adjustable sensitivity and delay settings found in certain models. These settings allow the user to customize the helmet based on their specific welding conditions. For instance, a welder can increase sensitivity for low-amperage tasks or adjust the delay to allow for a smoother transition from dark to light after completing a weld.

Furthermore, the helmets come with a reliable battery life, ensuring that they can be used for long periods without interruption. Some models also feature solar assist functionality, which helps recharge the auto-darkening filter, enhancing their overall efficiency.

In summary, the Lincoln Electric NA-5NF, NA-5SF, NA-5N, and NA-5S welding helmets represent a significant advancement in personal protective equipment for welders. Their combination of auto-darkening technology, wide viewing area, lightweight design, durability, and customizable settings makes them an excellent choice for anyone engaged in welding tasks. With these helmets, users can achieve greater safety and efficiency in their work, enabling them to focus on their craft with peace of mind.