Lincoln Electric LN-742 LN-742 Operator's Manual page 35

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PROBLEMS
(SYMPTOMS)
The display is blank. No wire feed
when the gun trigger is activated.
No wire feed when the gun trigger
is activated. The solenoid does not
function. No arc voltage present.
The display board indicates the
LN-742 has input power applied.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE
1. Make sure the control cable is
connected to the welding power
source correctly.
2. Make sure the welding power
source is turned on and func-
tioning properly.
3. Check the 42 VAC fuse or cir-
cuit breaker in the welding
power source.
1. Check or replace the gun trigger
switch.
2. Check the gun trigger recepta-
cle. Check for loose or faulty
connections.
LN-742 & LN-742H
CAUSE
If all recommended possible areas of
misadjustment have been checked
and the problem persists, Contact
your local Lincoln Authorized
Field Service Facility.
CAUTION
RECOMMENDED
COURSE OF ACTION
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