Lincoln Electric RANGER 305G EFI Service Manual page 19

LINCOLN ELECTRIC
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The machine welds normally in
all modes and the range of
weld output seems normal, but
one or both of the front panel
displays is blank. The machine
displays an obviously incorrect
value or only segments of
numbers are illuminated.
A control cable type wire
feeder does not function when
connected to the 14 pin
Amphenol receptacle. Machine
operates normally in CC-STICK
mode and has normal AC
auxiliary output.
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 1-888-935-3877.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
WELD OUTPUT PROBLEMS
1. It is normal for one of the
displays to be off when there is
no load across the weld output
terminals. In CV-WIRE mode,
only the "VOLTS" display will be
illuminated, in all other modes
only the "AMPS" display will be
illuminated.
1. Check associated circuit
breaker for the 120 VAC and 42
VAC supplies.
2. Check the Amphenol
receptacle for damaged,
corroded or dirty contact pins.
3. The wire feeder control
cable may be defective.
4. The wire feeder may be
defective.
Ranger® 305G EFI Service Manual
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. NOTE: Both the "AMPS" and
the "VOLTS" front panel
displays use the same part
numbered display unit. If one
of the digital displays appears
to be functioning normally, it
can be used to test the weld
control board output to the
malfunctioning display.
2. If the known good display
functions normally while in
place of the malfunctioning
display, the weld control board
is good and only the
malfunctioning display unit
should be replaced.
3. If the known good display
exhibits the same type of
problem as the malfunctioning
display, the weld control board
is defective and should be
replaced.
1. Use a voltmeter to check for
the presence of supply voltage
at the 14 pin Amphenol
receptacle. 115-120 VAC
power is supplied through pins
A and J, 42 VAC power is
supplied through pins I and K.
2. NOTE: Be careful that meter
probes do not deform or
damage the contact pins in the
Amphenol receptacle.
3. Perform the Stator Voltage
Test Procedure.
14