Lincoln Electric IM465 INVERTEC DC TIG STARTER - Manual (Page 23)

E-5 TROUBLESHOOTING E-5
INVERTEC DC TIG STARTER
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
PROBLEMS
(SYMPTOMS)
RECOMMENDED
COURSE OF ACTION
Postflow Time does not vary with knob; 15
seconds always.
Downslope does not vary with knob.
Current Limit does not vary with knob.
1. Check leads and connections for the postflow adjustment poten-
tiometer, R1.
2. Check that there is approximately 15 VDC between leads 13 and
15 and that the voltage between leads 16 and 15 varies from 0.1
to approximately 15 VDC when the postflow knob is rotated
throughout its full range. Repair or replace R1 and/or the associ-
ated leads as needed.
3. Replace the control board.
NOTE: If the postflow adjustment becomes disabled, the control
board will use a preset of 15 seconds for postflow timing.
1. Check leads and connections for the downslope adjustment
potentiometer, R2.
2. Check that there is approximately 15 VDC between leads 13
and 17 and that the voltage between leads 8 and 17 varies from
0.1 to approximately 15 VDC when the downslope knob is rated
throughout its full range. Repair or replace R2 and/or the associ-
ated leads as needed.
3. Replace the control board.
1. Check leads and connections for the current limit vary adjust-
ment potentiometer, R3.
2. Check that there is approximately 15 VDC between leads F and
19 and that the voltage between leads A and 19 varies from 0.1
to approximately 15 VDC when the current limit knob is rotated
throughout its full range. Repair or replace R3 and/or the associ-
ated leads as needed.
3. Replace the control board.