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TROUBLESHOOTING & REPAIR
F-6 F-6
COMMANDER 300
Observe Safety Guidelines
TROUBLESHOOTING GUIDE
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
OUTPUT PROBLEMS
The machine has welding output
but no control of output. The auxil-
iary power is normal.
1. If a remote control unit is NOT
connected to the machine,
make sure the LOCAL/
REMOTE switch is in the
“LOCAL” position.
2. If a remote control unit IS con-
nected and the machine oper-
ates normally when the switch is
in the “Local” position, the
remote control cable or unit may
be faulty. Check or replace.
1. If the machine operates normal-
ly in the “LOCAL” position but
not in the “remote” position, per-
form the RF Bypass Board
Resistance Test.
2. Check the Remote/Local switch
and associated wiring. See the
Wiring Diagram. (leads #75,
#76 and #77)
3. Perform the Power Module
Test.
4. Perform the Control Input Test.
5. Perform the Feedback Input
Test.
6. Perform the PWM Output Test.
7. The Control Board may be faulty.
The machine has low welding out-
put and low auxiliary output.
1. Check the brushes for wear and
proper contact to the slip rings.
2. The engine RPM may be low.
1. If the engine high idle speed is
low, perform the Throttle Ad-
justment Test.
2. Perform the Rotor Resistance
Test.
3. Perform the Rotor Voltage
Test. If the rotor voltage is low,
the field capacitor or field bridge
may be faulty. Test and replace
if necessary. See the Wiring
Diagram.
4. If the engine high idle RPM is
OK, then the engine may have
lost horsepower and be in need
of major repair.