Lincoln LT-7 Troubleshooting Manual page 17

B-8
Troubleshooting Guide –
components. See Wiring Diagrams for troubleshooting of specific circuits.
PROBLEMS
(SYMPTOMS)
The wire will NOT inch down but
inches up properly. When the start
switch is pressed the wire does not
feed.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln
Electric Service Department for electrical technical troubleshooting assistance before you proceed.Call 216-383-2531 or 1-800-
833-9353
TROUBLESHOOTING AND REPAIR
See Wiring Diagrams for location of specified
FIELD
COURSE OF ACTION
FUNCTIONAL PROBLEMS
1. Press the inch down switch and
observe light 1B on the control
board. If light 1B is lit and the
motor does not activate the control
board may be faulty.
LT-7 TRACTOR
RECOMMENDED SHOP
COURSE OF ACTION
1. If light 1B does NOT light,
CAUTION
Observe Safety Guidelines
detailed in the beginning of this manual.
when the inch down switch is
pressed, measure the DC volt-
age from lead #586 to lead
#539 while pressing the inch
down switch. Normal voltage
is 12 to 15VDC.
•If normal voltage is indicated
the control board may be
faulty.
•If normal voltage is not pre-
sent the logic board may be
faulty.
B-8