Lincoln Electric POWER FEED 10M SINGLE/DUAL SVM172-A Service Manual page 122

F-18
VOLTAGE SENSE PC BOARD TEST (continued)
J2
2 3
J1
4 5
TEST PROCEDURE
1. Remove input power from the wire feed
unit.
2. Using the 3/8 in. nut driver, remove the
cover from the wire feeder.
3. Locate the voltage sense PC board and
plugs J1 and J2. Do not remove the
plugs from the voltage sense pc board.
Refer to Figure F.1.
4. Apply the correct input power (from the
Power Wave 455 control cable) to the
wire feeder. With the gun trigger activat-
ed, check for approximately 12 VDC at
plug J1 pin 1 (+) to pin 4 (-). If the 12
VDC is NOT present, the feedhead
board may be faulty. Also check for
loose or faulty wires and connections
between the feedhead board (plug J85
and plug J1 on the voltage sense PC
board.
TROUBLESHOOTING & REPAIR
FIGURE F.1 – VOLTAGE SENSING BOARD TEST
2
POWER FEED 10M SINGLE/DUAL
NOTE: Inspect the molex plug con-
nector pins on the Voltage Sense
Board. If any of them are gold plat-
ed the P.C. board should be
replaced.
5. With the gun trigger activated and arc
voltage present at the conductor block,
check for arc voltage from plug J1 pin 3
(lead 67) to the workpiece. If actual arc
voltage is NOT present, check the conti-
nuity of lead 67 from the conductor block
to plug J1 pin 3 on the voltage sense PC
board.
6. If the actual arc voltage IS present at
plug J1 pin 3 (lead 67), then check for
arc voltage from plug J2 pin 2 (lead 67B)
to the workpiece. See wiring diagram.
7. If the 12 VDC IS present in step #4 and
the arc voltage IS present in step #5 but
the arc voltage is NOT present in step
#6 (lead 67A), the voltage sense PC
board may be faulty.
8. Remove all input power from the wire
feeder unit.
9. Install the wire feeder cover with the 3/8
in. nut driver.
F-18