Lincoln Electric IM697 RED-D-ARC MX 300 - Manual (Page 23)

E-3 TROUBLESHOOTING E-3
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 Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
Meter turns on, input contactor
pulls in, thermal light is off.
Machine has no output:
Preset is not adjustable:
Note: Panel control is disabled if
Remote is plugged in.
Preset range is not right:
None of the meters comes on in
CC or CV settings:
Meter comes on in only one of the
CC or CV settings:
1. The output cable connections may
be faulty. Check (+) Electrode
and Work cable connections.
2. The connections at control box
plugs, chopper boards plugs, or
Analog Control Power Supply PCB
connectors may be faulty.
3. Inputs to Chopper PCB or
Chopper PCB may be faulty.
4. The Analog Control Supply PCB
may be faulty.
5. The connection at PCB connec-
tors inside the control box may be
faulty.
6. The Weld Control PCB may be
faulty.
1. The output control potentiometer
or its connections may be faulty.
2. The Weld Control board or its con-
nections may be faulty.
1. A faulty or missing plug P3 at con-
nector J3 of Weld Control PCB.
2. The Weld Control board or its con-
nections may be faulty.
1. The Analog Control Power Supply
PCB or its connections may be
faulty.
2. The Weld Control PCB or connec-
tions to meters may be faulty.
3. Faulty meters.
1. The Weld Control PCB or connec-
tions to meters may be faulty.
2. Faulty meters.
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Authorized
Field Service Facility.
RED-D-ARC MX350