Lincoln Electric POWER FEED 25M Service Manual page 83

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Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The purge switch does not activate
the gas solenoid, but gun trigger
closure in the MIG or pulse modes
does activate the solenoid. The
LEDs are steady green on the
power source, and wire drive unit.
The COLD INCH/GAS PURGE
switch does not turn on the wire
drive motor but gun trigger closure
in the MIG or Pulse modes does
activate the wire drive motor.
The LEDs are steady green on the
power source, and wire drive unit.
The voltmeter on the wire feeder
does not function properly even
though the STATUS LEDS are
steady green.
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 technical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
All manuals and user guides at all-guides.com
TROUBLESHOOTING AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
FUNCTION PROBLEMS
1. Make certain the COLD
INCH/GAS PURGE switch is
operating properly.
2. Check for loose or faulty leeds
between COLD INCH/GAS
PURGE switch and the feedhead
board. See wiring diagram.
1. Make certain the COLD
INCH/GAS PURGE switch is
operating properly.
2. Check for loose or faulty leeds
between the COLD INCH/GAS
PURGE switch and the feedhead
board. See wiring diagram.
1. Make sure the DIP switches are
configured correctly for the weld-
ing polarity being used.
Setting Dip Switches in the Wire
Drive in the Installation section
of this manual.
2. Check the #67 lead on the wire
drive unit. Make sure it is connect-
ed to the motor gear box and also
the voltage sense PC board.
3.Check the work sensing leads on
the POWER FEED® 25M power
source. Check leads #202 (Neg.
output terminal) and #206 (pos.
output terminal).
FEED® 25M wiring diagram.
external voltage sensing is utilized,
Check the #21 lead between the 4-
pin receptacle on the front of the
POWERWAVE® and the work-
place.
CAUTION
POWER FEED® 25M
RECOMMENDED
COURSE OF ACTION
1. If the COLD INCH/GAS PURGE
switch is operating correctly and
the associated leeds are OK.
The feedhead board may be
faulty.
1. If the COLD INCH/GAS PURGE
switch is operating correctly and
the associated leads are OK.
The feedhead board may be
faulty.
1. Check leads #513 and #514 from
J85 on the feedhead board to the
See voltage sense PC board. Verify
placement in proper cavities.
2. Perform the Voltage Sense
Board Test.
3. The display board may be faulty.
4. The feedhead control board may
be faulty.
5. The Control Box control board
may be faulty.
See POWER
If
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