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Problem
Machine operation abnormal
Machine operation abnormal
Upper shaft locks at a certain point
in one cycle
Upper shaft pulley does not turn.
Stitches cannot be made.
• Is any set screw of the rotary encoder loosened?
• Is any set screw of the machine pulley loosened?
• Is any set screw of the machine motor pulley loosened?
• Is embroidery data normal?
• Is the XY carriage belt damaged?
• Are any set screws for the XY pulley loosened?
• Are any set screws for the coupling of the XY pulse motor
loosened?
• Is the thread take-up stopped due to interference with the upper
case cover?
[Adjustment]
Thread take-up
Upper case cover
Needle case
Loosen the hexagon socket head cap screw of the thread take-
up operating lever and adjust the take-up movable range.
Tighten it securely afterwards.
• Are the needle bar clamp and the top dead center stopper
positioned correctly?
• Is the presser foot lifted at a retract position when the power is
turned on?
Lower the presser foot using the lever.
• Is the needle attached properly?
• Is the timing of the needle and rotary hook correct?
BES-916AC • BES-1216AC
Chapter 10 Troubleshooting
Check Point
Bolt
Thread take-up
operating lever
145
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