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TROUBLESHOOTING AND REPAIR
F-18F-18
POWER MIG 200
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WIRE DRIVE MOTOR AND TACHOMETER FEEDBACK TEST
(continued)
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 F5.
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.
FROM LEAD
TO LEAD
EXPECTED
VOLTAGE
Black (-)
BLUE (+)
3.0 TO 4.0
VDC
ELECTRIC SHOCK can kill.
• Do not touch electrically live
parts such as output terminals
or internal wiring.
• All input power must be electri-
cally disconnected before pro-
ceeding.
WARNING
Black
Tach
J11
Black
Arm
White
Arm
Blue
Tach
Red
Tach
FIGURE F.5. – PLUG J4