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F-26
TROUBLESHOOTING & REPAIR
F-26
NA-5
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 the Lincoln Electric
Service Department for technical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.
CAUTION
FUNCTION PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
The set speed is adjustable and
steady. The actual speed reading is
incorrect and or erratic.
The set volts and actual volts read-
ings match within a few tenths of a
volt while welding. However both
readings are inaccurate.
1. Check that the jumper plug is
installed securely in the harness
receptacle near the voltage
board. Codes below 8300 only.
2. Check for loose or faulty connec-
tions on leads #510A, #525A and
#555 between the tach receptacle
and the control board.
3. Check the tach cable from the
tach board to the tach receptacle.
The shield in the cable should
NOT be grounded to the case.
1. Put the Lincoln power source in
the machine control mode.
Check to see if the power supply
can be set for the arc voltage
required for the process. If not,
the power source may be faulty.
2. The control cable may be faulty.
Check or replace.
1. Remove the drive motor end cap
and the tach cover plate from the
end of the wire drive motor.
Check to make sure the slotted
disc is secure and aligned and
rotates freely through the center
of the module pick-up.
2. Perform the
Tach Board
Feedback Test.
3. If the
Tach Board Feedback
Test
is OK the control board may
be faulty. Replace.
1. Check the voltage sensing leads
for continuity. (zero ohms). #21
should have continuity to the
work piece and #67 should have
continuity to the wire feed head
assembly. See wiring diagram.
2. Perform the
Voltmeter Accuracy
Test.
3. Perform the
Meter Circuit
Accuracy Test.
4. The voltage board may be faulty.
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