Lincoln Electric CITOTIG 315DC Service Manual page 52

HF BOARD TEST - W05X1615 (continued)
J71
to Input
control Board
TEST PROCEDURE
Use always electrically insulate gloves during this test procedure
1. Carefully apply 400Vac +/- 15% or 230Vac-3ph +/-15% to the
2. Turn the machine input switch to ON position and wait till the power LED on front panel is steady green.
3. Set the machine to TIG DC or AC HF welding mode and connect the TIG torch to the machine.
4. Check between J71 pin 2 & pin 4 for 24Vdc always present
5. Check between HV-RTN and cathode of diode D10 for 1000V +/- 40V
6. Press the trigger and check between J71 pin 3 & pin 4 for 15Vdc (only for 3 seconds)
7. When 15Vdc are present between J71 pin 3 & pin 4 check waveform, as indicated on the figure below, between
cathode and anode of D12. NOTE: HV and HV-RTN have to be connected to the HF transformer during this test.
Diode D9
Figure 19 – W05X1615 HF board test points
CITOTIG 315DC or 415DC
53
HV
(to the HF transformer)
HV-RTN
(to the HF transformer)