Lincoln Electric Power MIG 300, Руководство по обслуживанию, Страница: 49 / 126

Retur
n to Section TOC
Retur
n to Section TOC
Retur
n to Section TOC
Retur
n to Section TOC
Retur
n to Master TOC
Retur
n to Master TOC
Retur
n to Master TOC
Retur
n to Master TOC
TROUBLESHOOTING & REPAIR
F-5 F-5
POWER MIG 300
TROUBLESHOOTING GUIDE
Observe Safety Guidelines
detailed in the beginning of this manual.
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely,
contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-800-833-9353.
PROBLEMS
(SYMPTOMS) POSSIBLE AREAS OF
MISADJUSTMENT(S) RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
No welding output but wire feeds
normally when gun trigger is pulled. 1. Check the input voltage at the
machine. Input voltage must
match the rating plate and the
reconnect panel.
2. The gun may be faulty. Check for
continuity.
3. Check continuity through the
work lead.
1. Check for loose or broken con-
nections at the output terminals,
the choke and all heavy current
carrying leads. See the Machine
Schematic.
2. Make sure that the transformer
secondary leads are securely
connected to the Output Rectifier
assembly.
3. Check for OCV at output studs
when trigger is pulled. If OCV is
present, the gun may be faulty.
Replace.
4. Check for 57VAC at the input of
output rectifier. If reading is not
correct Perform
Main
Transformer Tests . If you mea-
sure approximately 57 VAC,
check for 80VDC at the output of
the output rectifier. If reading is
not correct perform the
Output
Rectifier Assembly Tests. If
80VDC is there Perform
Chopper Board Test.
5. Check for 15VDC input to the
Control Board at leads 12J4
(412) to 10J4 (410), -15VDC at
leads 11J4 (411) to 10J4 (410),
5VDC at leads 8J4 (408) to 10J4
(410). If missing a voltage check
wiring back to Digital Power
Supply PCB. If voltage is ok, the
Control Board may be faulty.
Replace.
CAUTION