Lincoln Electric IDEALARC SP-250 Service Manual page 53

F-6
TROUBLESHOOTING GUIDE - Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
The audio alarm does NOT sound
when a key is pressed, but display
changes.
The audio alarm does not sound
when a key is pressed, and the dis-
play does NOT change.
There is no gas flow when gun trig-
ger is pulled. Wire feeds and weld
voltage is present. The display func-
tions properly.
No readable message on the dis-
play. Backlight is lit indicating there
is power to the machine.
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. The background noise may be
too loud for user to hear beeper.
1. Remove the gun. If the problem
is resolved the gun is faulty.-
Replace.
1. Make certain that a process is
selected that requires gas flow.
2. Check gas source and hoses for
leaks or kinks.
1. Check the input voltage at the
machine. The input voltage
must match the rating plate and
the reconnect panel.
2. Turn the line switch (S1) off.
Wait a minute and turn power
on. If problem is not resolved
contact your
Electric Authorized Field Service
Facility.
CAUTION
IDEALARC SP-250
RECOMMENDED
COURSE OF ACTION
1. Check the voltage across pins
1J7 (+) to 2J7 (-) on the control
board. When the keys are
pressed there should be a brief
indication, or pulse, of a DC volt-
age. If the voltage "pulse" is pre-
sent then the Piezo alarm may
be defective.- Replace.
If the DC voltage pulse is NOT
present when the keys are
pressed then the control board
may be defective.-Replace.
1. Perform the Keypad Test.
2. The control board may be faulty.
- Replace.
3. The LCD Display may be faulty.-
Replace.
1. Check the gas solenoid by dis-
connecting it from the control
board (Plug J8) and applying a
12VDC external supply to the
gas solenoid.
does NOT activate then it may
be faulty. - Replace.
2. The control board may be faulty.-
Replace.
1. The display board may be faulty.
Replace.
2. The control board may be faulty.
Replace.
local Lincoln
F-6
If the solenoid