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E-4
TROUBLESHOOTING
E-4
CV-400-I
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
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
Thermal Protection Indicator light is
on.
Machine does not have maximum
output
Machine will not shut off.
Variable or sluggish welding arc.
Digital meters do not light
- or -
Digital meter display is incorrect.
1. Thermostat circuit has opened.
2. Faulty Control PC Board.
1. Faulty Control PC Board.
2. Voltage Adjust potentiometer
defective.
3. Voltage Adjust potentiometer
leads open.
1. Defective power switch.
1. Poor work or electrode
connection.
2. Welding leads too small.
3. Welding current or voltage
too low.
4. Defective SCR bridge.
1. Faulty Meter PC board.
2. Faulty Control PC Board.
1. Allow machine to cool. Be sure to
provide adequate ventilation for
machine.
2. See PC Board Troubleshooting
Procedure.
1. See PC Board Troubleshooting
Procedure.
2. Check and replace if faulty.
3. Check and repair broken leads.
1. Replace.
1. Check and clean all connections.
2. Check table in this manual.
3. Check procedures for recommended
settings.
4. Check and replace if defective.
1. See PC Board Troubleshooting
Procedure.
2. See PC Board Troubleshooting
Procedure.