PRECISION TIG 275

Return to Section TOC Return to Master TOC

Return to Section TOC Return to Master TOC

Return to Section TOC Return to Master TOC

 

F-14

TROUBLESHOOTING & REPAIR

F-14

 

Observe Safety Guidelines

 

 

TROUBLESHOOTING GUIDE

 

detailed in the beginning of this manual.

 

 

 

PROBLEMS

 

POSSIBLE AREAS OF

RECOMMENDED

 

 

(SYMPTOMS)

 

MISADJUSTMENT(S)

COURSE OF ACTION

 

 

 

 

STICK WELDING PROBLEMS

 

 

 

The stick electrode “blasts-off”

1. Welding current may be too high

1. Perform the SCR Bridge Test.

 

when touched to the work piece.

for the electrode size. Reduce

2. The control board may be faulty.

 

 

 

current control setting or use a

 

NOTE: BEFORE REPLACING A

larger diameter electrode.

 

 

 

 

 

 

 

CONTROL BOARD

 

 

 

 

If an Advanced Control Panel is

 

 

 

 

installed, remove it and replace

 

 

 

 

the Jumper in connector J-3. If

 

 

 

 

the machine functions normally,

 

 

 

 

the Advanced Process panel or

 

 

 

 

harness is defective.

 

 

 

 

Variable or sluggish welding arc 1.

Check the work and electrode

1.

Check the polarity switch for

when welding in the Stick mode.

cables for loose or poor connec-

 

excessive wear or faulty connec-

2.

tions.

2.

tions.

The welding cables may be too

Check the interior heavy current

 

small or too long to permit the

 

carrying leads and connections.

3.

desired current to flow.

 

 

The welding current may be set

 

 

 

too low.

 

 

Return to Section TOC Return to Master TOC

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.

Page 60
Image 60
Lincoln Electric SVM162-B service manual Stick Welding Problems, Stick electrode blasts-off Welding current may be too high