Brother International ZE-856A Instruction Manual - English and Spanish - Page 224

16. TROUBLESHOOTING 16. FEHLERSUCHE 16. RESOLUTION DES PROBLEMES 16. LOCALIZACION DE AVERIAS 16. TROUBLESHOOTING • Please check the following points before calling for repairs or service. • If the following suggestions do not solve the problem, turn off the machine power supply and contact your nearest Brother service center. 16-1. Machine head DANGER Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet before opening the face plate of the control box. Touching areas where high voltages are present can result in severe injury. CAUTION Turn off the power switch and disconnect the power cord before carrying out troubleshooting, otherwise the machine will operate if the treadle is pressed by mistake, which could result in injury. Problem 1. Upper thread is not tight. 0573M 2. Lower thread is not tight. 0574M 3. Skipped stitches occur while sewing 0621M 4. Flattened zigzags appear in the stitch during intermittent sewing (855A) 1406M Possible cause • Is the upper thread tension too weak, or is the lower thread tension too strong? Adjust the upper thread tension or lower thread tension. • Is the lower thread tension too weak, or is the upper thread tension too strong? Adjust the lower thread tension or upper thread tension. • Is the needle tip bent? Is the needle tip blunt? If the needle tip is bent or broken, replace the needle. • Is the needle properly installed? If it is incorrect, install the needle correctly. • Is the machine properly threaded? If it is incorrect, thread the thread correctly. • Is the presser foot pressure too weak? Adjust the presser foot pressure. • Is the needle too thin? Replace the needle with a needle that is one rank thicker. • Is the presser foot too high? Adjust the height of the presser foot. • Is the needle and rotary hook timing incorrect? Adjust the height of the needle bar. Adjust the clearance between the needle and the rotary hook. • Is the thread tension spring too weak? Adjust the tension of the thread tension spring. • Has the treadle been depressed backward? Do not press the treadle backward when the sewing machine is stopped. (When DIP switch 2-4 is set to ON, needle zigzagging also occurs when the treadle is depressed backward, in order to prevent a flattened zigzag from being sewn if the treadle is depressed backward by mistake.) • Does the treadle move too easily when it is depressed backward? Adjust the force required to depress the treadle backward so that it is a bit heavier. Page 130 130 - 46 51 132 - 146 151 153 145 - 40 44 205 ZE-855A,856A