Lincoln Electric INVERTEC IM465-B - Manual (Page 21)

E-3 TROUBLESHOOTING E-3
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
No output; fan operates.
No HF arcing; OCV present.
1. Perform steps 1 and 2 under heading on previous page of “No
output; fan does not operate”.
2. Check that the Invertec’s Meter Polarity Switch is in the correct
position for the electrode polarity being used.
3. Check that the RED LED on the control board is not illuminated.
If it is illuminated, replace the control board.
4. If solenoids engage when the arc start switch is closed, check
that the Invertec produces OCV:
a. If OCV is not present, check that the arc start switch has
continuity when closed and repair or replace to correct, or
replace the control board if the arc start switch is correct.
b. If OCV is present, see the heading below of “No HF arcing;
OCV present”.
1. If a welding arc can be started using the scratch start method:
a. Check leads 107 and 108 for proper connections and conti-
nuity.
b. Replace the HIGH FREQ FIRING BOARD.
c. Replace the CONTROL BOARD.
d. Replace the HIGH FREQ TRANSFORMER, T2.
2. If a welding arc cannot be started using the scratch start
method, check continuity of the work lead and torch and repair
or replace as needed. Check the continuity between both of the
DC TIG Starter’s torch connectors and the Invertec’s negative
output terminal: repair or replace the input cable assembly, the
HF transformer lead connections, or the HF transformer, T2, as
needed.