Lincoln Electric IDEALARC SP-255 Service Manual page 61

F-8
TROUBLESHOOTING GUIDE - Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
No control of wire feed speed.
Other machine functions are normal.
There is no wire feed when gun trig-
ger is pulled. Normal open circuit
voltage is present.
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 1-888-935-3877.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
WIRE FEEDING PROBLEMS
1. The thumb switch circuit in the
gun may be faulty. Check or re-
place.
1. If the drive rolls are turning then
check for a mechanical restriction
in the wire feed path, or improper
drive roll pressure.
2. The gun liner may be clogged.
Check or replace.
3. If the drive rolls are NOT turning
when the gun trigger is pulled
then contact your local Lincoln
Electric Authorized Field Service
Facility.
CAUTION
IDEALARC
COURSE OF ACTION
1. Perform the Wire Drive Motor
and Tach Feedback Test.
2. The control board may be faulty.
- Replace.
1. Perform the Wire Drive Motor
and Tach Feedback Test.
2. The control board may be faulty.
- Replace.
SP-255
®
F-8
RECOMMENDED