Lincoln Electric SVM138-A Service Manual page 71

F-7
TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
The wire feeds when the gun trig-
ger is activated, but there is no arc
voltage.
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.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
FUNCTION PROBLEMS
1. Make sure the interlock switch
is in a "Wire Hot" position.
2. Check the welding cables for
loose or faulty connections.
3. Put a jumper wire from #2 to #4
on the power source terminal
strip. (Machines with 14 pin
amphenols: pin C to pin D.) If
the arc voltage is not present at
the output terminals, the power
source is faulty. If the arc volt-
age IS present, the problem is
in the wire feeder or control
cable.
4. Check the continuity of leads #2
and #4 through the control
cable. Replace if "open."
CAUTION
LN-9 GMA Wire Feeder
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. The 1CR relay, located on the
power PC board, may be faulty.
Check or replace.
2. If a burnback kit is installed,
remove and install the jumper
plug. If the problem is solved,
the burnback kit is faulty.
3. Check the #2 and #4 leads in
the LN-9 GMA wiring harness
for loose or faulty connections.
See the Wiring Diagram.
F-7