See figure f.16, Troubleshooting and repair, Contactor & contactor pc board test (continued) – Lincoln Electric LN-25 SVM114-C User Manual
Page 67: F-29, J2 j3 j1, J4 j14, Ln-25
TROUBLESHOOTING AND REPAIR
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L12253-4
CONTROL
J2
J3
J1
667
621
J4
J14
512
500
691
690
555
Contactor
FIGURE F.16 CONTROL BOARD (L12253-[ ])
CONTACTOR & CONTACTOR PC BOARD TEST (continued)
1. Check to be sure that plug P14 is connected to the
Control Board and is secure.
2. Apply at least 25vdc but no more than 100vdc to the
LN-25™ from the Electrode cable to the Work
Sensing Lead.
Observe the polarity and set the
Polarity Switch accordingly.
3.
Check for the applied voltage at Plug J1 pins 1 and
3 (leads 667+ and 621-). See Figure F.16.
4. With the Trigger closed and a normally operating
contactor connectedthe voltag measured at Pins 1
and 9 of J14 should be approximately 1.0VDC.
If
not, the Control Board may be defective.