Lincoln Electric IDEALARC SP-250 Service Manual page 54

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TROUBLESHOOTING GUIDE - Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
The display backlight does not func-
tion.
The machine stops feeding wire
while welding and the MOTOR
OVERLOAD message appears on
the display.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, con-
tact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call 216-
383-2531 or 1-800-833-9353
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
FUNCTION PROBLEMS
1. Check the input voltage at the
machine. Input voltage must
match the machine rating plate
and the reconnect panel.
1. Check for mechanical restric-
tions in the wire feeding path.
The gun cable may be clogged.
CAUTION
IDEALARC SP-250
RECOMMENDED
COURSE OF ACTION
1. With the display board discon-
nected test for 12VDC from pins
1J1(+) to 2J1(-). If the 12VDC is
present and the display board
backlight does NOT function
then replace the display board.
See Wiring Diagram.
2. If the 12VDC is not present at
pins 1J1 to 2J1 then perform the
Main Transformer Test.
3. The control board may be faulty.
Replace.
1. Check the motor armature cur-
rent. Normal armature current is
1.5 - 2.5 amps.
If the motor armature current is
normal the control board may be
faulty.-Replace.
2. If the motor armature current is
high (over 3 amps) and there are
NO restrictions in the wire feed-
ing path then the motor or gear
box may be defective.-Replace.
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