Lincoln Electric LN-9 SVM127-A Service Manual page 94

F-36
VOLTMETER ACCURACY TEST (continued)
ELECTRIC SHOCK can kill.
TROUBLESHOOTING & REPAIR
WARNING
• With power applied, there
are high voltages inside
the wire feeder. Do not
reach into the wire feeder
or touch any internal part
of the wire feeder while
power is applied.
LN-9 Wire Feeder
3. With the LN-9 gun trigger closed or the gun
terminals jumpered together (see the Wiring
Diagram), the test meter reading should
match the LN-9 ACTUAL volts reading within
+/- 0.5 volts. If it does not, check the integri-
ty and placement of the voltage sensing leads
Perform the Meter Circuit
#21 and #67.
Accuracy Test.
4. Remove the test voltmeter and, while weld-
ing, compare the SET volts and ACTUAL volts
meter readings. Depending upon the arc volt-
age characteristics of the welding process
being used, the ACTUAL reading may vary
somewhat around an average value.
average ACTUAL reading should match the
SET reading within +/- 0.5 volts. If not, refer
to the Meter Circuit Accuracy Test.
5. If no further tests are required, remove the
jumper from the gun terminals (if used) and
close the left case side cover assembly.
F-36
The