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V350-PRO
TROUBLESHOOTING & REPAIR
F-4 F-4
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, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-800-833-9353(WELD).
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
Major physical or electrical dam-
age is evident when the sheet
metal cover is removed.
1. Contact your local authorized
Lincoln Electric Field Service
Facility for technical assis
tance.
1. Contact the Lincoln Electric
Service Department,
1-800-833-9353(WELD).
The machine is dead—no out-
put—no displays.
1. Make sure the input line/
breaker switch is in the ON
position.
2. Check the main input line fuses.
If open , replace.
3. Check the 2 amp circuit breaker
(CB2). Reset if tripped.
4. Make sure the reconnect switch
and jumper lead is configured
correctly for the applied input
voltage.
5. If the machine is being operat-
ed with single phase input volt-
age make sure the red lead is
not connected. See the
Installation Section.
1. Perform the Auxiliary
Transformer Test.
2. Perform the Power Board Test.
3. The control rectifier and or
associated filter capacitor (C5)
may be faulty. Check and
replace as necessary.
4. Perform The SPI Cable
Resistance and Voltage Test.
5. The Control Board may be
faulty.
The main input fuses (or breaker)
repeatedly fail.
1. Make certain the fuses or
breakers are sized properly.
2. Make sure the reconnect switch
and jumper lead is configured
correctly for the applied input
voltage.
3. The welding procedure may be
drawing too much input
current or the duty cycle may
be too high. Reduce the
welding current and /or reduce
the duty cycle.
1. Check the reconnect switches
and associated wiring. See the
wiring diagram.
2. Perform the Input Rectifier
Test.
3. Perform the Main Switch
Board Test.
4. Perform the Output Diode
Module Test.
5. The Input Filter Capacitors
may be faulty. Check, and if
any are faulty replace all four.