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F-4

TROUBLESHOOTING & REPAIR

F-4

TROUBLESHOOTING GUIDE

 

 

Observe Safety Guidelines

 

 

 

detailed in the beginning of this manual.

 

 

 

 

 

 

PROBLEMS

 

POSSIBLE AREAS OF

RECOMMENDED

 

 

(SYMPTOMS)

 

MISADJUSTMENT(S)

COURSE OF ACTION

 

 

 

 

 

 

 

 

 

 

FEEDING PROBLEMS

 

 

 

 

 

 

 

Major physical or electrical damage

1. Contact your local authorized

1. Contact the Lincoln Electric

is evident when the sheet metal

Lincoln

Electric Field Service

Service Department,

 

 

cover(s) are removed.

 

Facility for assistance.

1-888-935-3877.

 

 

 

 

 

 

 

 

 

 

 

 

The LN-15 does not “power-up”

1. Make sure the correct input volt-

1. Check the on/off switch.

See

 

when the on/off switch is turned to

age is being applied (15 to

the wiring diagram.

 

 

the ”ON”position.

 

110VDC).

See Specifications

2. Check the input rectifier bridge.

 

 

Pages.

 

 

 

 

See the wiring diagram.

 

 

 

 

 

 

 

 

 

 

2. Make certain the “Work Clip” is

3. Perform the Boost Power

 

 

attached securely to the work

Supply Board Test.

 

 

 

 

piece.

 

4. The control board may be faulty.

 

 

 

 

 

 

 

 

5. If the Display Board is not lit

 

 

 

 

check the input voltages to the

 

 

 

 

Display Board. See the Wiring

 

 

 

 

Diagram.

 

 

 

 

 

 

When the gun trigger is activated

1. Make sure the contactor is func-

1. Perform The Contactor Test.

the wire drive runs and electrode

tioning correctly.

 

 

 

wire feeds, but there is no welding

 

 

2. The Control Board may be faulty.

output.

 

2. Check the current carrying leads

 

 

 

 

 

at the contactor and between

 

 

 

 

 

the contactor and the feed plate

 

 

 

 

 

for loose or faulty connections.

 

 

 

 

 

See the Wiring Diagram.

 

 

 

 

 

3. Make sure the welding gun is

 

 

 

 

 

connected correctly and func-

 

 

 

 

 

tioning correctly.

 

 

 

 

 

4. Make certain the DC power

 

 

 

 

 

source is functioning correctly.

 

 

 

 

 

 

 

 

 

 

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.

LN-15

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Lincoln Electric SVM166-A service manual Feeding Problems