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TROUBLESHOOTING & REPAIR
F-7 F-7
COMMANDER 300
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely,
contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FUNCTION PROBLEMS
The output control on the
Commander 300 does not work
properly.
1. Make sure the Remote/Local
switch is in the “Local” position.
2. The output control (R1) may be
defective.
1. Check the Remote/Local switch
and associated wiring. See the
Wiring Diagram. (leads #75,
#76 and #77)
2. Perform the Power Supply
Test.
3. Perform the Control Input
Test.
4. Perform the Feedback Input
Test.
5. Perform the PWM Output Test.
6. Perform the Power Module
Test.
The remote output control does not
function properly.
1. Make sure the Remote/Local
switch is in the “Remote” posi-
tion.
2. The remote control unit may be
faulty. Repair or replace.
1. Check the Remote/Local switch
and associated leads. See the
Wiring Diagram.
2. Check the amphenols and
associated leads. See the
Wiring Diagram.
3. Perform the RF Bypass Board
Resistance Test.