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TROUBLESHOOTING & REPAIR
F-31 F-31
LN-9 Wire Feeder
WIRE DRIVE MOTOR AND TACH FEEDBACK TEST (continued)
FIGURE F.6 – LEAD #539, #541, #626B AND #627B AT POWER PC BOARD TERMINAL STRIP
LEAD 539
LEAD 541
LEAD 626B
LEAD 627B
TEST PROCEDURE
1. Remove input power to the LN-9 wire feed-
er.
2. Remove any electrode wire or disengage
the drive rolls.
3. Using the phillips head screw driver, remove
the screws from the left side cover assem-
bly.
4. Lift the left side cover assembly.
5. Locate leads #539, #541, #626B and #627B
at the power PC board terminal strip. See
Figure F.6.