Lincoln Electric IDEALARC DC-1500 Service Manual page 45

F-11
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Poor arc starting when the DC-
1500 is in the CV Sub-Arc or CV
Innershield Modes.
Poor arc characteristics in all
processes.
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 AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. Make sure the proper welding
procedures are being used
(wire feed speed, arc voltage
and wire size).
2. Check weld cables for loose
or faulty connections.
1. Check for the correct input
voltages on the three phase
input lines at the DC-1500.
2. Make sure the proper welding
procedures are being used
(wire feed speed, arc voltage
and wire size).
3. Check the welding cables for
loose or faulty connections.
CAUTION
IDEALARC® DC-1500
RECOMMENDED
COURSE OF ACTION
1. Check the 4CR reed switch.
The voltage from lead #210
to lead #220 should be 8
VDC when the DC-1500 is in
an idle condition (on but not
welding). When the machine
is producing welding current,
the reed switch
should close and the voltage
from #210 to #220 should
drop to zero. Note: Check
7CR on Code 8146-8293.
2. Perform the Firing Board
Test.
3 Perform the SCR Output
Bridge Test.
4. The control board may be
faulty - Replace.
1. Check the Mode Switch
(SW5) and the associated
wiring for loose or faulty con-
nections. See wiring dia-
gram.
2. Check the 4CR reed switch.
The voltage from lead #210
to lead #220 should be 8
VDC when the DC-1500 is in
an idle condition. When the
machine is producing weld-
ing current, the reed switch
(4CR) should close and the
voltage from #210 to #220
should drop to zero.
3. Perform the Firing Board
Test.
4. Perform the SCR Output
Bridge Test.
5. The control board may be
faulty - Replace.
F-11
(4CR)