Lincoln Electric LN-25 Service Manual page 47

F-10
GAS SOLENOID VALVE AND SOLENOID PC BOARD TEST
POLARITY
SWITCH
SOLENOID PC BOARD
1. Apply at least 25 VDC but no more
than 100 VDC to the LN-25 from the
electrode cable to the work sensing
lead. Make sure the polarity switch is
set to match the polarity of the
electrode cable. For example, if the
electrode cable is positive and the
work sensing lead is negative, set the
polarity switch to positive. See
Figure F.3.
TROUBLESHOOTING AND REPAIR
(continued)
FIGURE F.3 Ð APPLIED VOL TAGE POLARITY .
WORK
SENSING LEAD
ELECTRODE CABLE
LN-25
F-10