Lincoln Electric IDEALARC SP-255 Service Manual page 59

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 trigger
is pulled. Wire feeds and weld volt-
age is present. The display functions
properly.
No readable message on the display.
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, 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)
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.- Re-
place.
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 re-
connect panel.
2. Turn the line switch (S1) off. Wait
a minute and turn power on. If
problem is not resolved contact
your local Lincoln Electric Author-
ized Field Service Facility.
CAUTION
IDEALARC
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 pres-
ent then the audio 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 Plug J21 and
applying a 12VDC external sup-
ply to the gas solenoid. If the so-
lenoid does NOT activate then
it may be faulty. - Replace.
2. Check wiring to Plugs J20 and
J21 (see wiring diagram). Make
sure Jumper Plug is in place
3. The control board may be faulty.-
Replace.
1. The display board may be faulty.
Replace.
2. The control board may be faulty.
Replace.
SP-255
®
F-6
RECOMMENDED