Lincoln LT-7 Troubleshooting Manual page 20

B-11
Troubleshooting Guide –
components. See Wiring Diagrams for troubleshooting of specific circuits.
PROBLEMS
(SYMPTOMS)
The wire feeds up with either inch
switch.
The wire feeds down with either
inch switch.
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. While pressing the inch down
switch observe light 2E on the
logic board. If light 2E does
NOT light the logic board may
be faulty.
2. If light 2E does light the control
board may be faulty.
1. With the LT7 at idle (not feeding
wire) observe light 2E on the
logic board. It should be off. If
light 2E is on the logic board
may be faulty.
2. If light 2E is off the control
board may be faulty.
LT-7 TRACTOR
RECOMMENDED SHOP
COURSE OF ACTION
1. Check the wiring to the inch
2. Check the wiring between the
1. Check the wiring to the inch up
2. Check the wiring between the
CAUTION
Observe Safety Guidelines
detailed in the beginning of this manual.
down switch. See wiring dia-
gram.
logic board and the control
board. See wiring diagram.
switch. See wiring diagram.
logic board and the control
board. See wiring diagram.
B-11