Lincoln LT-7 Troubleshooting Manual page 24

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Troubleshooting Guide –
components. See Wiring Diagrams for troubleshooting of specific circuits.
PROBLEMS
(SYMPTOMS)
No control of power source output
from LT7 tractor. Power source
does have output.
The circuit breaker trips while the
LT7 is at idle (not feeding wire).
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. Check control cable leads for
proper connection to power
source.
2. Make sure the Lincoln power
source is in the remote control
mode.
1. Isolate the problem by unplug-
ing the printed circuit boards
one at a time and checking to
see if circuit breaker trips.
LT-7 TRACTOR
RECOMMENDED SHOP
COURSE OF ACTION
1. Check the continuity of leads
2. Check the resistance and oper-
3. Check the continuity of leads
1. If the problem is not in a printed
CAUTION
Observe Safety Guidelines
detailed in the beginning of this manual.
#75, #76 and #77 in the control
cable.
ation of the voltage control
rheostat (R2). Normal resis-
tance is 10,000 ohms.
#75, #76 and #77 from the con-
trol rheostat (R2) to the control
cable receptacle.
circuit board then check the
wiring harness for "shorts" or
grounded leads.
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