Lincoln Electric IM664 Multi-Weld 350 Arc Converter - Manual (Page 25)

E-4 TROUBLESHOOTING E-4
MULTI-WELD 350
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
The meter is not accurate:
Fan does not run when turning
machine on:
Fan does not run when welding:
No control, very high output cur-
rent:
No control, maximum output cur-
rent stays around 200A:
No control :
1. The Analog Control Power Supply
PCB or its connections may be
faulty.
2. The Weld Control PCB may be
faulty.
1. Fan does not normally run until
machine is welding. See
Instruction Manual.
1. Faulty Supply voltage to fan.
2. Faulty fan
3. The Weld Control PCB may be
faulty.
1. Input shorts to output.
2. Faulty shunt lead connection.
3. Faulty output control potentiome-
ter or its connections.
4. Faulty Weld Control PCB.
1.Output shorted
2. Faulty voltage feedback connec-
tion.
3. Faulty Weld Control PCB.
1. Faulty output control potentiome-
ter or its connections.
2. Faulty connections at Weld
Control PCB connectors.
3. Faulty Weld Control PCB.
If all recommended possible areas of
misadjustment have been checked
and the problem persists, Contact
your local Lincoln Authorized
Field Service Facility.