Troubleshooting & repair, Warning caution – Lincoln Electric PRECISION TIG 275 SVM162-B User Manual
Page 57
F-11
F-11
PRECISION TIG 275
TROUBLESHOOTING & REPAIR
TROUBLESHOOTING GUIDE
Observe Safety Guidelines
detailed in the beginning of this manual.
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
TIG WELDING PROBLEMS
No high frequency. The machine is
in the TIG mode and has normal
output.
NOTE: BEFORE REPLACING A
CONTROL BOARD
If an Advanced Control Panel is
installed, remove it and replace
the Jumper in connector J-3. If
the machine functions normally,
the Advanced Process panel or
harness is defective.
1. If the machine is in a dirty envi-
ronment with conductive contam-
inants, check and clean the
spark gap with a low pressure air
stream per the maintenance
instructions.
2. Check the spark gap operations
and setting. Normal is (0.015”).
Refer to the
of this manual.
3. Check circuit breaker CB1.
Reset if necessary.
4. Check connection J12 on the
control board.
1. Check the high voltage trans-
former (T2). The normal resis-
tance of the secondary winding is
12.5k ohms.
ELECTRIC SHOCK
CAN KILL. When
115 VAC is applied
to T2, a very high
voltage is devel-
oped on the secondary winding. For
assistance, call the Lincoln Electric
Service Department. 1-888-935-
3877.
2. Check R5, C6, C7, L2 and L3.
Replace if defective.
3. The control board may be faulty.
The High frequency is on continu-
ously in DC TIG or shuts off in AC
TIG.
1. None
1. Check plug J11 on the control
board. See the Wiring Diagram.
2. Check micro-switch S2A for
proper operation. See the Wiring
Diagram.
3. The control board may be faulty.
WARNING
CAUTION