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E-3
PROBLEMS
(SYMPTOMS)
Machine has maximum output but
not control.
Machine has minimum output and no
control.
Machine does not have maximum
output.
Variable or sluggish welding arc.
Machine has output but trips off
immediately when wire feed unit
start button is pressed.
Machine will not shut off.
Output control not functioning on the
machine
(1)
.
(1)
If connected to an LN-9 or NA-5, disconnect leads 73, 74, 75 before troubleshooting.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE
1. Output control switch (SW3) in wrong
position.
2. Output control switch faulty.
3. Open in feedback circuitry.
4. Faulty control or firing circuit P.C.
boards.
5. Output control potentiometer circuit
open (Lead 75).
1. Terminals 73, 74, 75, 76 or 77
grounded to positive output.
1. One input fuse blown.
2. One phase of main transformer open.
3. Faulty control or firing circuit P.C.
boards.
4. Output control potentiometer defec-
tive.
5. Output control potentiometer leads
open - 76, 77, 226, 236, 237, 238.
1. Machine has either an internal or
external short circuit on the output.
2. Faulty control P.C. board.
3. Terminals 73, 74, 75, 76, 77 ground-
ed to negative output terminal.
1. Poor work or electrode connection.
2. Welding leads too small.
3. Welding current or voltage too low.
4. Defective main SCR bridge.
1. Input contactor contacts frozen.
2. Faulty 2CR relay.
IDEALARC® DC-1000
CAUSE
1. Check position of switch.
2. Check switch and replace if faulty.
3. Check wiring and control and firing
4. All light emitting diodes must be lit,
5. Check and replace potentiometer if
1. Check 73, 74, 75, 76 or 77 for ground
1. Check and replace if blown after
2. Check for open and repair.
3. All light emitting diodes must be lit on
4. Check and replace if faulty.
5. Repair.
1. Check internally and externally for
2. Replace control board. See P.C.
3. Check for grounded 73, 74, 75, 76,
1. Check and clean all connections.
2. Check table in instruction manual.
3. Check procedures for recommended
4. Check and replace if defective.
1. Check and replace if necessary.
2. Check and replace if necessary.
CAUTION
RECOMMENDED
COURSE OF ACTION
circuit P.C. board wiring harness
plugs.
except LED4 on the control/fault
board. See P.C. board troubleshoot-
ing guide.
faulty. Check wiring of Lead #75.
to positive output circuit.
checking for reason for blown fuse.
both P.C. boards, except LED4 on
control/fault board. See P.C. board
troubleshooting guide.
any shorts and remove or repair.
board troubleshooting guide.
77.
settings.
E-3
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