Lincoln Electric LN-9 SVM127-A Service Manual page 120

F-62
TACH PC BOARD REMOVAL AND REPLACEMENT (continued)
5. Remove control PC board leads #510, #525
and #555. See Figure F.22.
6. Hold the nut in place with the 3/8" wrench.
With the phillips head screw driver, remove
the locking screw from the rotating disc. See
Figure F.23.
FIGURE F.23 – REMOVAL OF ROTATING DISK LOCKING SCREW
PC BOARD
TROUBLESHOOTING & REPAIR
FIGURE F.22 – CONTROL PC BOARD LEADS
PHILLIPS
SCREW
TACH
LN-9 Wire Feeder
LEADS 510, 525, 555
7. Carefully remove the rotating disc and tach
PC board together. Note the spacer washers
underneath the disc.
DISC NUT
F-62