Keypad Resistance Test - Lincoln LN-742 Service Manual

F-18 F-18
TROUBLESHOOTING AND REPAIR

KEYPAD RESISTANCE TEST

WARNING
Service and repair should only be performed by 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 technical troubleshooting assistance before you proceed. Call 216-383-2531
or 1-800-833-9353(WELD).
TEST DESCRIPTION
This test will determine if any key is not functioning properly.
MATERIALS NEEDED
5/16" Nutdriver
Analog Volt/Ohmmeter
Flat Blade Screwdriver
LN-742 & LN-742H