Lincoln LN-742H manual Troubleshooting

Models: LN-742 LN-742H

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E-7

TROUBLESHOOTING

E-7

 

 

 

 

Observe all Safety Guidelines detailed throughout this manual

 

 

 

 

PROBLEMS

(SYMPTOMS)

POSSIBLE

CAUSE

RECOMMENDED

COURSE OF ACTION

The welding arc is variable or

1. Check the welding cables for

“hunting”.

 

loose or faulty connections.

 

2.

Make sure the wire feed speed,

 

 

voltage, polarity and shielding

 

 

gas are correct for the process

 

 

being used.

 

3.

Check for mechanical restric-

 

 

tions in the wire feed path.

 

4.

Make sure the welding power

 

 

source is functioning properly.

 

 

 

Poor arc striking with sticking or

1.

Make sure the wire feed speed,

“blast-offs”. The weld bead may be

 

voltage, polarity and shielding

ropy and narrow.

 

gas are correct for the process

 

 

being used.

 

2.

Make sure the welding power

 

 

source is functioning properly.

 

3.

Make certain the gas solenoid is

 

 

operating properly and the gas

 

 

flow rate is correct for the pro-

 

 

cedure.

 

4.

The welding gun may be faulty.

 

 

Check for gas leaks or replace

 

 

gun.

 

 

 

 

 

 

If all recommended possible areas of misadjustment have been checked and the problem persists, Contact your local Lincoln Authorized Field Service Facility.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

LN-742 & LN-742H

Page 40
Image 40
Lincoln LN-742H manual Troubleshooting