Lincoln Electric IDEALARC DC-1500 Service Manual page 44

F-10
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The weld output terminals are
always electrically "hot".
Machine trips off with high
current procedures upon starting.
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. Remove any external leads
hooked to #2 and #4 on the
terminal strip. If the problem
disappears, the fault is in the
control cable or wire feeder.
2. If some open circuit voltage is
present (over 3 VDC.) after
performing Step #1, then the
problem is within the DC-
1500.
1. OCV setting is too high.
2. Defective control board.
CAUTION
IDEALARC® DC-1500
RECOMMENDED
COURSE OF ACTION
1. Check for an internal short
between leads #2 and #4.
See wiring diagram.
2. The Pilot Relay (6CR) may
be stuck closed. Check or
replace.
3. Perform Firing Board Test.
4. Perform Control
Test.
5. Perform the SCR Output
Bridge Test.
6. The SCR Snubber(s) may
be "leaky". Check or replace.
See wiring diagram.
1. Reduce OCV setting.
2. Perform Control Board Test.
Replace if needed.
F-10
Board