Lincoln Electric 10372 Service Manual page 118

F-54
TEST PROCEDURE
1. Remove input power from the wire
feeder unit.
2. Using the 3/8 in. nutdriver, remove the
cover from the wire feeder.
3. Locate plug J4 on the control board.
Refer to Figure F.13. Do NOT remove
the plug from the control board.
4. Apply the correct input power (from the
Power Wave 455 control cable) to the
wire feeder unit and check for approxi-
mately 12 VDC from pin #1 (red wire)
positive to pin #3 (black wire) negative.
This is the supply voltage from the
control board to the tach feedback
unit. If the 12 VDC is missing or not
correct, the wire feeder control board
may be faulty. Also check for loose or
faulty wires and connections.
TROUBLESHOOTING ND REP IR
T CH FEEDB CK TEST ( ontinued)
FIGURE F.13 — T CH FEEDB CK TEST.
#1
#3
RED
BLACK
#2
(BLUE)
J4
POWER W VE 455/POWER FEED 10
WIRE FEED
CONTROL BOARD
5. With the gun trigger activated and the
motor running, check the feedback
voltage at plug J4 pin #2 (blue wire)
positive to pin #3 (black wire) negative.
Normal feedback voltage is approxi-
mately 5 VDC. If the correct supply
voltage is present and the feedback
voltage is missing, the tach unit may be
faulty. With the motor NOT running,
the feedback voltage may be either 0
or 10 VDC depending upon where the
motor stopped.
6. Remove input power from the wire
feeder unit.
7. Install the wire feeder cover with the
3/8 in. nutdriver.
F-54