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E-3
TROUBLESHOOTING
E-3
DC-655
Observe all Safety Guidelines detailed throughout this manual
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.
CAUTION
PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Machine has output, but no control.
Machine does not have maximum
output.
Poor arc striking with semiautomatic
or automatic wire feeders.
1. Check the Local/Remote output
switch (SW3) and associated
leads. See wiring diagram.
2. Make sure the remote control
leads #75, #76 and /or #77 are
NOT grounded to either welding
output.
3. Make sure control cable to feeder
(if used) is connected properly.
4. The output control potentiometer
may be faulty.
5. Control board transformer may be
faulty
6. The control or firing board may
be faulty.
1. Make sure the correct three-
phase input is applied to the DC-
655 machine.
2. The output control potentiometer
may be faulty.
3. The control or firing board may
be faulty.
1. Make sure the mode switch is in
the proper position for the
process.
2. Make sure the welding cables
and connections are secure.
3. Check for correct welding proce-
dures.
Contact your Local Lincoln Authorized
Field Service Facility for technical
troubleshooting assistance.