Lincoln Electric IDEALARC SP-255 Service Manual page 58

F-5
TROUBLESHOOTING GUIDE - Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
The output voltage and wire feed is
present continuously or pulsing when
gun trigger is NOT activated.
Output settings (voltage and/or wire
feed speed) are being changed even
though gun thumb switch or keypad
keys are not being activated.
No wire feed or open circuit voltage
when gun trigger is pulled. The dis-
play lights up but the audio alarm and
the display do not function properly.
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)
OUTPUT PROBLEMS
1. Remove the gun. If the problem
is resolved the gun trigger circuit
is faulty. Repair or replace.
2. If the problem is not resolved
then contact your Local Lincoln
Electric Authorized Field Service
Facility.
1. Remove the gun. If the problem
is resolved the gun thumb switch
circuit may be faulty. Repair or
replace.
2. If the problem persists after gun
removal then the keypad may be
faulty. Check for burned or dam-
aged areas on the keypad.
1. Check the input voltage at the
machine. Input voltage must
match the rating plate and the re-
connect panel - High or Low Line
message may be displayed.
2. Remove the gun. If the problem
is resolved the gun is faulty.- Re-
place.
CAUTION
IDEALARC
COURSE OF ACTION
1. Check the machine's internal trig-
ger leads for grounds or shorts.
See Wiring Diagram.
2. The control board may be faulty.
Replace.
1. Check leads #326 and #327 for
grounds or shorts. See Wiring
Diagram.
2. The Keypad may be faulty. Per-
form the Keypad Test.
3. The control board may be faulty.
Replace.
1. Perform the Keypad Test.
2. Perform the Main Transformer
Test.
3. The control board may be faulty.-
Replace.
4. The LCD display may be faulty. -
Replace.
SP-255
®
F-5
RECOMMENDED