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TROUBLESHOOTING & REPAIR
F-5 F-5
INVERTEC STT
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
1-888-935-3877
.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
Machine has no welding output (no
open circuit voltage), and the wire
feeder does not feed wire when the
gun trigger is pulled.
1. The 42VAC circuit breaker CB1
may be tripped. Reset if neces-
sary.
2. Check the 4 amp slow blow fuse
located on the reconnect panel.
Replace if faulty.
3. Put a jumper between pins "A"
and "C" on the 5 pin amphenol
located on the LN-742 wire
feeder. If wire feeds, check the
gun trigger. Repair or replace if
necessary.
4. Check for the presence of
42VAC at pins "K" and "I" on the
14 pin amphenol. If the 42VAC
is present and the feeder does
not work, the problem is in the
feeder control cable or the wire
feeder.
1. If 42VAC is NOT present at pins
"K" and "I" on the 14 pin amphe-
nol, perform the T1 Auxiliary
Transformer Test.
2. Check leads #43 and #212C for
loose or faulty connections
between the T1 auxiliary trans-
former and the remote protec-
tion board. See the Wiring
Diagram. Also check the conti-
nuity through the remote protec-
tion board to the 14 pin amphe-
nol. See the Remote Protection
Board Schematic.