Lincoln Electric 10372 Service Manual page 117

F-53 TROUBLESHOOTING ND REP IR F-53
T CH FEEDB CK 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 determine if the tach unit is receiving the correct supply voltage from the
control board, and also if the tach unit is sending feedback information to the control
board.
This procedure takes approximately 7 minutes to perform.
M TERI LS NEEDED
3/8 in. nutdriver
Volt-Ohmmeter
POWER W VE 455/POWER FEED 10