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TROUBLESHOOTING & REPAIR
F-8 F-8
LN-9 Wire Feeder
Observe Safety Guidelines TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
216-383-2531 or 1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FUNCTION PROBLEMS
The SET speed is adjustable and
steady. The actual speed is uncon-
trollable. The meter displays the
actual speed correctly or reads
"EEE."
1. Contact your local Lincoln
Authorized Field Service
Facility.
1. While the motor is running,
carefully unplug the 15 pin
molex plug from the control
board.
If the motor continues to run,
the power PC board may be
faulty. Replace.
If the motor stops, the control
PC board may be faulty.
Replace.
2. Perform the
Wire Drive Motor
Test.
The SET speed is adjustable and
steady. The actual speed reading
is incorrect, erratic, or zero.
1. Check for loose or faulty con-
nections on leads #510, #525,
and #555 between the tach
board and the control PC board.
1. Check to make sure the slotted
disc in the tach housing is
secure and aligned.
2. Perform the
Tach Board
Feedback Test.
3. If the
Tach Board Feedback
Test
is OK, the control PC
board may be faulty. Replace.