User manual HUSQVARNA 1200

[. . . ] They assume a thorough knowledge of the handling of precision appliances and accessibility to service tools. The manual is divided into four sections and covers all service operations and checks which should be carried out when making a complete overhaul of a sewing machine. The first section controls the working order of the different parts. The second section deals with the various settings which must be maintained to ensure that the machine functions satisfactorily. [. . . ] When the thread tension is correctly set the weight shall pull the thread slowly from the bobbin case. Adjust the thread tension by means of the screw. 12 Upper thread tension Requirements, model 1050/1070/1090 When the machine is set at straight stitching resp. Zig-zag, a correct take-up should be obtained, when the catch of the thread tension pulley (5, 5) is right in front of the index. Requirements, model 1100/1200 When the sewing guide of the machine is set at non elastic normal and straight stitching resp. Zig-zag, a correct take-up should be obtained, when the catch of the thread tension pulley (5, 5) is right in front of the index. Comment 1 The sewing guide adjusts the thread tension to the fabric resp. To the sewing at which the machine is set. This is done by means of the computer and the step motor of the machine. Comment 2 The thread tension that is set now is to be regarded as a general indication. This general indication can be risen and lowered by means of the thread tension pulley and remains as long as the main switch is on. At the side of the thread tension dial there is an adjustment screw (A) for the setting of the upper thread tension. This is accessible from the rear by means of a screwdriver. Set the catch of the thread tension dial in the middle of the index. When test sewing with normal fabric and thread turn the adjustment screw until the correct take-up is obtained for straight stitching and zig-zag. 32 Husqvarna service manual 104 72 30-26 SEWKNITWORLD 13 Setting the thread tension of the step motor Requirements The thread tension pulley shall always be at its starting position (5, 5) when the main switch is switched on and off repeatedly. 35) but leave the cables connected to the circuit board. 39), but leave the cable connected to the circuit board. -Insert the service casette into the front cover. -Get into the service mode of the machine by pressing the reverse feeding and (-) stitch length buttons while switching on the main switch. - Loosen the screw in the cog wheel (B) of the step motor. 14 The setting of the thread take-up spring Requirements The casing (C) should be set in such a way, that the thread take-up spring has finished its movement when the needle eye reaches the fabric after a completed stitch. [. . . ] Check the cable to the lower thread sensor. The machine is sewing with the presser foot lifted. Check the cable to the micro switch of the presser foot lever. Check that the peg of the presser foot lever is pushing in the micro switch. [. . . ]