Lincoln Electric 10372 Service Manual page 89

F-25 TROUBLESHOOTING ND REP IR F-25
SWITCH BO RD TEST
W RNING
Service and repair should only be performed by Lincoln Electric factory trained
personnel. Unauthorized repairs performed on this equipment may result in dan-
ger to the technician or machine operator and will invalidate your factory war-
ranty. 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 per-
form the test/repairs safely, contact the Lincoln Electric service department for
technical troubleshooting assistance before you proceed. Call 216-383-2531 or
1-888-935-3877.
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TEST DESCRIPTION
This test will help determine if the "power section" of the switch boards are function-
ing correctly. This test will NOT indicate if the entire PC board is functional. This
resistance test is preferable to a voltage test with the machine energized because
these boards can be damaged easily. In addition, it is dangerous to work on these
boards with the machine energized.
This procedure takes approximately 20 minutes to perform.
M TERI LS NEEDED
3/8 in. nutdriver
3/8 in. wrench
Analog Volt-Ohmmeter
POWER W VE 455/POWER FEED 10