Brother International 4234DT Users Manual - English and Spanish - Page 13
Chart of thread tension adjustment, Two-needle Four-thread
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English Chart of thread tension adjustment, Two-needle (Four-thread) A: Reverse B: Surface C: Left needle thread D: Right needle thread E: Upper looper thread F: Lower looper thread A C Left needle thread is loose. Tighten left needle thread. B (yellow) A D B A C D B A F E B A F E B A F E B Right needle thread is loose. Left needle thread is tight. Right needle thread is tight. Upper looper thread is tight. Lower looper thread is loose. Upper looper thread is loose. Lower looper thread is tight. Upper looper thread is loose. Lower looper thread is loose. Tighten right needle thread. (green) Loosen left needle thread. (yellow) Loosen right needle thread (green) Loosen upper looper thread (pink) Tighten lower looper thread (blue) Tighten upper looper thread (pink) Loosen lower looper thread (blue) Tighten upper looper thread (pink) Tighten lower looper thread (blue) When you adjust the thread tension, do it in the following order: (1) Left needle thread (2) Right needle thread (3) Upper looper thread (4) Lower looper thread This is the easiest way to obtain the correct thread tension. 9
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