Filter
Top Products
Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC
Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC
TROUBLESHOOTING & REPAIR
F-9 F-9
LN-9 GMA Wire Feeder
TROUBLESHOOTING GUIDE Observe Safety Guidelines
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 erratic or not
adjustable over entire range of con-
trol. The actual speed is also errat-
ic like the SET speed.
1. Check for loose or faulty con-
nections on leads #631, #632,
and #633 between the speed
control potentiometer (R2) and
the control PC board.
1. Remove power to the LN-9
GMA and disconnect the plug to
the control PC board. Check
the resistance of the speed con-
trol potentiometer (R2). When
measured from the wiper (lead
#632) to lead #633, the resis-
tance should vary smoothly
from 0 to 10,000 ohms when the
shaft is rotated. See the Wiring
Diagram.
2. The control PC board may be
faulty. Replace.
The wire continues to feed with the
gun trigger open, and the wire is
electrically "hot." The interlock
switch is in the "OFF" position.
1. Disconnect the gun trigger cable.
If the problem is resolved, the
gun trigger or cable is faulty.
Repair or replace.
1. Disconnect lead #530 from the
trigger PC board. See the
Wiring Diagram. If the problem
is resolved, the trigger board is
faulty. Replace.
2. Relay 1CR may be stuck
closed. Check or replace.
3. The power PC board may be
faulty. Replace.