Lincoln Electric 11937 Service Manual page 30

F-16
P2
1 2
3 4
PROCEDURE
NOTE: POLARITY MUST BE OBSERVED FOR
THESE TESTS.
Test for correct wire drive motor armature voltage.
1. Disconnect main input power to the machine.
2. Perform the Case Cover Removal Procedure.
3. Locate plug P3 on the wiring harness. See
Wiring Diagram. Plug P3 is inserted into J2 and
J3 on the Control Board.
4. Locate leads 315 and 309 on Plug P3. See
Figure F.3.
5. Make the following voltage tests:
WARNING
ELECTRIC SHOCK can kill.
• Have an electrician install and
service this equipment. Turn the
input power OFF at the fuse box
before working on equipment. Do
not touch electrically hot parts.
TROUBLESHOOTING AND REPAIR
WIRE DRIVE MOTOR TEST (continued)
FIGURE F.3 – PLUGS P2 AND P3
1
9
309
WIRE FEEDER WELDER (180 MODEL)
P3
A. Turn the machine off between each test.
B. Carefully insert the meter probes into the
lead side of plug P3. See Figure F.3.
C. Turn the machine ON and pull the gun trig-
ger to conduct the voltage test.
FROM LEAD TO LEAD
315 309
6. If the voltage to the wire drive motor armature
is zero, check the wires between plug P3 and
the wire drive motor.
7. If the leads and connections are good to the
board, verify the correct supply voltage 18 -
32 VDC at pins 7 and 10 at P3 on the control
board.
8. If voltage is correct at P3, the control board
may be faulty. Replace the control board.
F-16
8
16
315
1.5 to 10.5 VDC