Troubleshooting Guide - Lincoln Electric POWER MIG SVM165-A Service Manual

F-4
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Major physical or electrical damage
is evident.
Machine is dead - no welding out-
put and no wire feed when gun
trigger is pulled.
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
1-888-935-3877.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. Contact your local Lincoln
Authorized
Facility.
1. Make certain that the input
power switch is in the "ON" posi-
tion.
2. Check the input voltage at the
machine. Input voltage must
match the rating plate and the
reconnect panel.
3. Blown or missing fuses in the
input line.
4. Check for thermal light on case
front. Thermostats may be open
due to machine overheating. If
machine operates normally after
a cooling off period then check
for proper fan operation and ven-
tilation. Make certain that the
machine's duty cycle is not being
exceeded.
5. Remove the gun trigger connec-
tion and jump the two connec-
tions at the machine. If you
have a wirefeed gun, it may be
faulty. Replace.
CAUTION
POWER MIG 350MP

TROUBLESHOOTING GUIDE

RECOMMENDED
COURSE OF ACTION
1. Contact the Lincoln Electric
Field Service Service Department at 1-888-
935-3877.
1. Check for the correct input volt-
age at the line switch. (L1-L2)
See Wiring Diagram.
2. Check for loose or faulty con-
nections between the line
switch and the reconnect
panel.
3. Perform the Main Transformer
Test.
4. Check the red LED's (1 & 2) on
the digital power supply board.
They should be lit indicating
that DC voltage is being
applied to plugs J42 and J43.
See Wiring Diagram.
If LED's 1 & 2 are not lit check
for the presence of 42 VDC at
plug J41 pin 2(+) and pin 1(-).
If the 42 VDC is present and
LED's 1 & 2 are not lit the digi-
tal power supply board may be
faulty.
If the 42 VDC is not present at
plug J41 perform the Control
Rectifier Test.
F-4