Lincoln Electric IDEALARC DC-600 Service Manual page 51

F-7
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Machine has maximum weld output
and no control.
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. If remote control is being used
set OUTPUT
SWITCH (SW3) in "OUTPUT
CONTROL AT DC600" position
and control weld output with the
OUTPUT CONTROL POTEN-
TIOMETER (R1) at DC600. If
the problem is solved check the
remote control unit (or wire
feeder) and associated control
cable.
CAUTION
IDEALARC
COURSE OF ACTION
1. Check OUTPUT CONTROL
CONTROL SWITCH (SW3) and associat-
ed wiring.
2. Check feedback leads #222
(negative
#215, and #210 (output shunt)
for loose or faulty connections.
See wiring diagram.
3. Check the #75 lead for continu-
ity (zero ohms) from the OUT-
PUT
TIOMETER (R1) to the control
board plug 2J1.
diagram.
4. Perform Firing Board Test.
5. Perform Control Board Test.
6. Perform SCR Output Bridge
Test.
® DC-600
F-7
RECOMMENDED
output terminal),
CONTROL POTEN-
See wiring