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E-3
PROBLEMS
(SYMPTOMS)
ELECTRICAL FAILURES
Machine fails to come on
(Power LED off)
Thermal overload
(Thermal LED on)
The fan works, but the output current
is unstable and can not be controlled
by the potentiometer while welding is
carried out.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE
1. No Input Voltage.
2. Faulty supply plug or cable.
3. Supply fuse blown or breaker
tripped.
1. Unit has been operated beyond its
capacity rating.
2. Airflow through machine is restrict-
ed or fan has failed.
1. Check the output current poten-
tiometer, and replace it if neces-
sary.
2. Verify output cables are attached
to the welder and tightly connect-
ed.
AUTOPRO™ 155S
CAUSE
If all recommended possible areas of
misadjustment have been checked
and the problem persists, Contact
your local Authorized Field
Service Facility.
CAUTION
RECOMMENDED
COURSE OF ACTION
E-3
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