Singer S14-77 Manuel D'instruction page 28

Replacing the Upper Cutter
Turn off the main power switch and unplug the
machine.
The upper cutter should be changed when it becomes blunt.
Change it by following the below instructions. If you are
having any difficulties, consult your service agent to make the
necessary adjustments.
• Place the upper cutter in its lowest position.
• Turn off the upper cutter (A). Open the front cover.
• Loosen the upper cutter set screw (B) and remove the upper
cutter (C).
• Place a new upper cutter in the groove of the upper cutter
holder. The front edge of the upper cutter is approx 0,5-
1mm lower than the cutting edge of the stationary cutter
(D).
• Tighten the upper cutter set screw (B).
• Turn the upper cutter (E) on again.
Storage
When the machine is not in use, be sure to keep it unplugged.
Store the machine, so it is not exposed to direct sunlight or
humidity.
Servicing
If you have any questions regarding service and/or operation,
contact our Customer Care department.
Trouble Shooting
Machine Does Not Run
Possible Cause: Machine not properly connected to power source.
Solution: Check that machine has been properly connected to power source (page 3).
Fabric Does Not Feed Well
Possible Cause: Stitch length is set too short for the fabric being sewn.
Solution: Increase the stitch length setting (page 14).
Possible Cause: Differential feed is not set in the correct position for the fabric being sewn.
Solution: Adjust the differential feed (page 12).
Possible Cause: Presser foot pressure not correctly set for fabric being sewn.
Solution: Adjust presser foot pressure (page 13).
Needle Breaks
Possible Cause: Needle may not be properly seated in the needle clamp.
Solution: Insert needle so that it is all the way up in the needle clamp, then tighten the screw securely (page 5).
Possible Cause: Manually pulling fabric from behind presser foot while sewing which causes needles to deflect.
Solution: Refrain from pulling fabric manually; allow feed teeth to draw fabric under presser foot.
24 – Machine Maintenance
English
0.5-1mm