Lincoln Electric LN-15 WIRE FEEDER SVM166-A Service Manual page 54

F-16
TROUBLESHOOTING AND REPAIR
LEADS 552 &553
TEST PROCEDURE
1. Remove power to the LN-15 machine.
2. Perform the Cover and Spindle
Mount removal procedure.
3. Locate and remove the two solenoid
leads 552 & 553 from the solenoid
valve. See Figure F.4.
4. Make sure the gas supply for the
solenoid is hooked up, and then apply
12 VDC to the gas solenoid.
5. If the solenoid activates and allows
gas flow, then the solenoid valve is
good.
NOTE: There should not be any gas flow
until the solenoid is activated.
GAS SOLENOID VALVE TEST
(continued)
FIGURE F.4 – LEADS 552 & 553
LN-15
GAS SOLENOID
6. If the solenoid does not activate and
allow gas to flow, then the solenoid is
faulty. Replace.
7. The normal solenoid resistance is
approximately 20 to 21 ohms.
8. Normal voltage (with gun trigger
activated) measured at the solenoid
is 6.5 VDC (leads 552 & 553).
9. If the voltage is not present at leads
552 & 553 the feed head control
board may be faulty.
F-16