See figure, Troubleshooting and repair, Warning – Lincoln Electric POWER MIG 11521 User Manual
Page 56
TEST FOR FEEDBACK VOLTAGE TO
CONTROL BOARD
1. Disconnect the main AC input power to the
machine.
2. Locate plug J4 and the tach leads. See
Figure F.5.
3. Connect main input power to the machine.
4. Make the following voltage tests:
a. Turn the machine OFF between each
test.
b. Carefully insert the meter probes into
the lead side of plug J4. See Figure
F.5.
c. Turn the machine ON and pull the gun
trigger to conduct the voltage test.
5. If the 3.0 to 4.0 VDC is present, the tachometer
circuit is sending the correct feedback signal
to the control PC board. Check the leads
and plug J5. See the Wiring Diagram.
6. If the 3.0 to 4.0 VDC is NOT present or NOT
correct, the control PC board is not receiving
the proper feedback voltage from the
tachometer circuit.
7. If the leads are okay, the tachometer circuit
may be faulty, replace the tachometer circuit.
8. Replace the tool tray.
WIRE DRIVE MOTOR AND TACHOMETER FEEDBACK TEST (continued)
TROUBLESHOOTING AND REPAIR
F-18
F-18
Power MIG® 215XT
FIGURE F.5 – PLUG J4
Black
Tach
J11
J11
Black
Arm
White
Arm
Blue
Tach
Red
Tach
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts such
as output terminals or internal wiring.
• All input power must be electrically dis-
connected before proceeding.
WARNING
FROM LEAD
TO LEAD
EXPECTED
VOLTAGE
Black (-)
BLUE (+)
3.0 TO 4.0
VDC