Lincoln Electric LN-25 Service Manual page 67

F-29
CONTACTOR & CONTACTOR PC BOARD TEST (continued)
621
J1
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.
All manuals and user guides at all-guides.com
TROUBLESHOOTING AND REPAIR
FIGURE F.16 CONTROL BOARD (L12253-[ ])
667
J3
555
J4
512
500
LN-25™
F-29
691
J14
J2
Contactor 690