Lincoln Electric PRECISION TIG IM936 - Manual (Page 34)

E-3 TROUBLESHOOTING E-3
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
METER PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS
RECOMMENDED
COURSE OF ACTION
Meter does not light up
Meter does not display V (Volt) or
Min A (Minimum current)
No gas
No control on post flow time
Pre flow & Post flow time too long
1. Bad meter or its connection.
2. Bad connection at P8 of Control
PC board.
3. Faulty Control PC board.
1. Bad Display switch or its connec-
tion.
2. Bad connection at P9 of Control
PC board.
1. Circuit breaker CB1 open. Press
CB1 in to reset.
2. Bad connection at P12 of Control
PC board.
3. Faulty gas solenoid valve SV1 or
its connection.
4. Faulty Control PC board.
1. Faulty potentiometer R3 or its
connection.
2. Bad connection at P9 of Control
PC board.
1. For Postflow; the DIP switch set-
ting on the Advanced Control
PCB (if installed) may be set for
time x2.
2. For Preflow; Menu setting too
long.
3. Missing plug P3 on Control board
or bad connection at P3 when an
Advanced Control PC board is not
present.
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field Service Facility.
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field Service Facility.
GAS PROBLEMS