E-3
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility
for technical troubleshooting assistance before you proceed.
CAUTION
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Machine does not have maximum output.
Poor welding characteristics. Poor arc
striking with sticking or “blast-offs”,weld
porosity, narrow and ropey looking bead,
or electrode stubbing into the plate.
1.
Voltage adjust potentiometer leads
open.
2.
Voltage adjust potentiometer defective.
3.
Faulty P.C. Board.
1.
Poor work or electrode connection.
2.
Improper settings for wire feed speed
and volts.
3.
Capacitor Bank Contactor not working.
4.
Capacitors in power source output cir-
cuit failed. A failure is indicated if the
small vent plug on the top of a capaci-
tor is raised or blown out.
5.
Opening in feedback circuit.
6.
Faulty P.C. Board.
1.
Check and repair broken leads.
2.
Refer to procedure for checking
Voltage Control Potentiometer on
Machine.
3.
Refer to Procedure for Replacing P.C.
Boards.
1.
Check and clean all connections.
2.
Refer to a welding procedures guide
for proper settings.
3.
Refer to the procedure for Checking the
Capacitor Bank Contactor CR3.
4.
Replace entire bank of capacitors,
observe correct polarity. Do not
replace individual capacitors.
WARNING: The liquid electrolyte in
these capacitors is toxic. Avoid contact
with any portion of your body. Clean
up vented electrolyte using rubber
gloves and a water dampened cloth.
Any electrolyte which gets on skin,
clean with soap and water.
5.
Check wiring and P.C. Board wiring
harness plugs. Pay special attention to
leads 667 and 621.
6.
Refer to procedure for replacing P.C.
Board.
WIRE FEED MODULE™
