Welder starts but fails to generate
current.
Welding arc is loud and spatters
excessively.
Welding current too great or too
small compared to indication on
the dial.
1. Generator or exciter brushes
may be loose or missing.
2. Exciter may not be operating.
3. Field circuit of generator or
exciter may be open.
4. Exciter may have lost excita-
tion.
5. Series field and armature cir-
cuit may be open-circuited.
6. Faulty wiring or terminal con-
nections to control PCB, or
faulty control PCB.
1. Current setting may be too
high.
2. Polarity may be wrong.
1. Exciter output low causing low
output compared to dial indica-
tion.
2. Operating speed too low or too
high.
3. “Current Control” shaft and
handle may have turned slight-
ly in the insulated bushing of
the current control brush hold-
er, caused by turning handle
too hard against one of the
stops.
If all recommended possible areas of
misadjustment have been checked
and the problem persists,
Contact
your local Lincoln Authorized
Field Service Facility.
6. If auxiliary power is not present,
check connections to J12 (flashing).
Check wiring continuity per wiring
diagram. Swap out control PCB.
3. With current control against the
minimum stop, set pointer to
within 1/8” of the “N” in “MIN.”
E-3
TROUBLE SHOOTING
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.
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
SAE-300
®
MP
CAUTION
Summary of Contents for SAE-300 MP K4089-2
Page 22: ...D 3 MAINTENANCE SAE 300 MP ...
Page 34: ...F 2 DIAGRAMS SAE 300 MP ...
Page 35: ...F 3 NOTES SAE 300 MP ...
