Lincoln Electric PRECISION TIG IM936 - Manual (Page 33)

E-2 TROUBLESHOOTING E-2
PRECISION TIG 375
Observe all Safety Guidelines detailed throughout this manual
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.
CAUTION
OUTPUT PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS
RECOMMENDED
COURSE OF ACTION
Thermal light comes on
Meter doesn’t light up
Has output in No gas & no hi-freq
Stick mode
but no output
in Tig mode
Gas & hi-freq are o.k.
No output in both Stick and Tig
modes
1. Thermal shut down. Dirt and dust
may have clogged the cooling
channels inside machine; air
intake and exhaust louvers may
be blocked.; welding application
may exceed recommended duty
cycle. Wait until machine cool
down and thermal light goes out.
Blow out machine with clean, dry
low pressure air; check air intake
and louvers; stay within recom-
mended duty cycle.
2. Bad thermostat or its connections
1. Losing AC supply to Control PC
board
2. Loosing input to machine
3. Faulty Control PC board
1. Faulty trigger or hand/foot Amptrol
or connections.
2. Faulty Protection PC board or
bad connection to Control PC
board
3. Losing trigger supply to Control
PC board
1. Faulty Control PC board
1. Bad connection at P4 of Control
PC board
2. Faulty Control PC board
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field Service Facility.