Lincoln Electric POWER WAVE SVM135-B Service Manual page 120

F-56
VOLTAGE SENSE PC BOARD TEST (continued)
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 AND REPAIR
FIGURE F.14 — VOLTAGE SENSING BOARD TEST.
1 2 3 J2
1
J1
4 5 6
POWER WAVE 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 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 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 plat-
ed the P.C. board should
be replaced