Lincoln Electric SVM189-B Service Manual page 59

F-5
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The machine has output, wire
feed, gas flow but NO fan.
The machine has output, gas
flow and fan but does not have
wire drive.
No wire feed when gun trigger is
pulled. Fan runs, gas flows and
machine has correct open circuit
voltage. ( 33 vdc maximum) -
weld output.
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.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT/FEEDING PROBLEMS
1. Possible faulty fan motor.
2. Possible faulty Control P.C.
Board.
1. Possible bad drive motor.
2. Possible bad Control P.C.
Board.
1. If the wire drive motor is
running, make sure that the
correct drive roll and wire
guide is installed in the
machine.
2. Check for clogged cable liner
or contact tip.
3. Check for proper size cable
liner and contact tip.
CAUTION
COMPACT WIRE WELDERS
RECOMMENDED
COURSE OF ACTION
1. Perform the Fan Motor Test.
2. Check for continuity between
#6 to Fan or #1 to Fan on
Control P.C. Board. Replace.
1. Perform the Wire Drive Test.
2. If 3 - 30 vdc is not at the drive
motor check for OCV at the
board on pins 1 and 10 on J3.
If OCV is present possible
faulty Control P.C Board.
Replace. If OCV is not
present check continuity of
wires CAP- and CAP+.
1. Perform the Wire Drive Test.
2. If wire drive test is OK, then
check for OCV at CAP- and
CAP+ on the control board. If
correct voltage is present,
possible faulty Control P.C.
Board. Replace.
3. If open circuit voltage is not
present at CAP- and CAP+ on
control board check continuity
of leads.
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