Lincoln Electric NA-5N Service Manual page 131

F-78
TACH PC BOARD REMOVAL AND REPLACEMENT
PROCEDURE
1. Remove input power to the NA-5.
2. With the 5/16" nutdriver locate and
remove the four screws holding the
tach cover to the wire feed drive
motor. See Figure F.13
3. Using the 5/16" nutdriver remove the
two screws from the connection box
cover.
4. Locate and disconnect the in-line
connectors from leads #510A,
#525A and #555.
FIGURE F.13 DRIVE MOTOR, TACH COVER, AND CONNECTION BOX
TROUBLESHOOTING & REPAIR
PICKUP
ASSEMBLY
WIRE
DRIVE
MOTOR
NA-5
(Continued)
5. Using the phillips head screwdriver,
remove the two screws from the
pick-up assembly cover .
Figure F.14. Remove the cover.
6. Hold the nut in place with the 3/8"
wrench. With the phillips head
screwdriver, remove the locking
screw from the rotating disc. See
Figure F.15
TACH COVER
MOUNTING
SCREWS (x4)
F-78
See