This is manual how to adjust the thread trimmer of Brother's twin needle sewing machine T-8421D series. If you find a defective in your thread trimming mechanism, please try to adjust/repair/fix it following the steps in the video.

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* Disassembly and assembly should only be carried out by a qualified technician.
* Carefully read the "SAFETY INSTRUCTION" and the whole of the service manual to understand this product before you start maintenance.
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