Lincoln Electric 10372 Service Manual page 120

F-56
VOLT GE SENSE PC BO RD TEST ( ontinued)
TEST PROCEDURE
1. Remove input power from the wire
feed unit.
2. Using the 3/8 in. nutdriver, 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.14.
4. Apply the correct input power (from the
Power Wave 455 control cable) to the
wire feeder. With the gun trigger acti-
vated, check for approximately 12 VDC
at plug J1 pin 1 (+) to pin 4 (-). If the 12
VDC is NOT present, the control board
may be faulty. Also check for loose or
faulty wires and connections between
the control board (plug J6) and plug J1
on the voltage sense PC board.
TROUBLESHOOTING ND REP IR
FIGURE F.14 — VOLT GE SENSING BO RD TEST.
1 2 3 J2
1
J1
4 5 6
POWER W VE 455/POWER FEED 10
2
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
continuity of lead 67 from the conduc-
tor block to plug J1 pin 3 on the volt-
age 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 1 (lead
67A) to the workpiece. See wiring dia-
gram.
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. nutdriver.
F-56
NOTE: Inspect the molex
plug connector pins on
the Voltage Sense Board.
If any of them are gold
plated the P.C. board
should be replaced