Gas Solenoid Test Procedure - Lincoln Electric LN-25x Service Manual

LINCOLN ELECTRIC

GAS SOLENOID TEST PROCEDURE

Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized
repairs performed on this equipment may result in danger to the technician or machine operator and will
invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety
notes and precautions detailed throughout this manual. If for any reason you do not understand the test
procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department
for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
TEST DESCRIPTION
This procedure will help determine if the Gas Solenoid is functioning properly.
MATERIALS NEEDED
Volt/Ohmmeter
12 VDC External Power Supply
Wiring Diagram
TEST PROCEDURE
1. Remove the input power to the LN-25x wire feeder.
2. Perform the Wire Drive Assembly And Control Box Cover Removal Procedure.
3. Locate the gas solenoid, on the rear of the machine. See Figure F.10. See Wiring Diagram.
4. Label and disconnect the solenoid coil leads #690 and #691 from the gas solenoid. See Figure F.11.
See Wiring Diagram.
5. Using a volt/ohmmeter, measure the resistance of the solenoid coil. The resistance should be
approximately 20 ohms. See Wiring Diagram.
6. Using a 12 VDC external power supply, apply 12 VDC to the solenoid's terminals. See Wiring
Diagram. The solenoid should activate with a "click".
7. If the solenoid passes the above tests, replace any previously disconnected leads and perform the
Wire Drive Assembly And Control Box Cover Replacement Procedure.
8. If any of the tests fail, the gas solenoid may be faulty.
9. If faulty, perform the Gas Solenoid Removal and Replacement Procedure.
LN-25x™ Service Manual
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