Service manual model: 13512, 14412, 15312.
Contents troubleshooting .................................................................................................. 1 - 3 service access (1) face cover, belt cover ..................................................... 4 service access (2) base plate .............................................
1 troubleshooting problem cause remedy reference 1. Skipping 1. Needle is not inserted insert the needle properly. Stitches properly. 2. Needle is bent or worn. Change the needle. 3. Incorrectly threaded rethread. 4. Needle or thread are use the recommended sewing inappropriate for fabric being need...
2 problem cause remedy reference 3. Breaking 1. Initial sewing speed is too fast. Start with medium speed. Upper thread 2. Thread path is incorrect. Use the proper thread path. 3. Needle is bent or dull. Replace with a new needle. 4. Upper thread tension is adjust upper thread tension p. 8 too stron...
3 problem cause remedy reference 6. Noisy 1. Backlash between shuttle hook see mechanical adjustment p. 14 operation gear and lower shaft gear is “clearance between needle and too great. Hook (no. 2).” 2. Lower shaft gear is loose. Eliminate the looseness. 3. Inappropriate belt tension. See mechanic...
4 (a) face cover service access (1) face cover to remove 1. Remove the face cover by removing the setscrew (a). To attach 2. Mount the face cover in reverse procedure of the removing..
5 base plate (a) service access (2) base plate to remove 1. Remove the setscrews (a). 2. Remove the base plate. To attach 3. Mount the base plate in reverse procedure of the removing..
6 service access front cover to remove: 1. Loosen the set screws (a), (b), and (c), and then, remove the front cover by removing the set screws (d), (e), (f), (g), (h), (i) and (j). Note: unhook the tab (l) from the rear cover when remove the front cover. To attach: 2. Follow the above procedure in ...
7 service access rear cover to remove: 1. Remove the face cover and front cover. (see page 5) 2. Loosen the setscrews (a), (b) and (c), and remove setscrews (d), (e) and (f). 3. Pull up the spool pins. Remove the machine socket. Remove the rear cover clearing the presser foot lifter frome the slit o...
8 mechanical adjustment top tension the top tension should be between 65 and 95g when pulling the thread up in the direction of c. * use polyester sewing thread #50 (white). * if it is not within the above limit, adjust as follows 1. Set the tension dial “3”. 2. Remove the cover. 3. Lower the presse...
9 (b) (e) (d) (c) cotton thread #50 mechanical adjustment bobbin tension to check: set the bobbin in the bobbin case and pass the thread (cotton #50) through the tension spring. The bobbin thread tension should be 45–55g when pulling the thread in the direction of (b). If the tension is out of the r...
10 (c) (a) (b) (d) (e) (f) 6.0 mm mechanical adjustment presser bar height and alignment to check: 1. Raise the presser foot lever (a). 2. The distance between the presser foot (d) and the needle plate (e) should be 6.0 mm (0.24"). Adjustment procedure: 1. Remove the face cover (see page 4). 2. Rais...
11 upper shaft worm gear setscrew (2 pcs.) 2–3 mm mechanical adjustment needle swing to check: adjust the needle swing according to the following procedure, if the needle bar starts moving sideways while the needle is in the fabric when sewing the zigzag pattern (with maximum zigzag width). Adjustme...
12 setscrew setscrew both clearances should be equal mechanical adjustment needle drop to check: when the needle swings in maximum zigzag width, the distance between both ends of the needle hole on the needle plate and the needle drop positions should be equal. If not, adjust as follows: adjustment ...
13 mechanical adjustment clearance between needle and hook (adjustment method no. 1) to check: the clearance between the needle and shuttle race should be –0.05 to +0.10 mm. If not, adjust as follows: adjustment procedure: 1. Remove the face cover (see page 4). 2. Set the pattern select dial at " "....
14 mechanical adjustment clearance between needle and hook (adjustment method no.2) to check: use this adjustment method no. 2 if the clearance cannot be adjusted by the method no.1. The clearance between the needle and shuttle race should be –0.05 to +0.10 mm. Adjustment procedure: 1. Set the patte...
15 feed lifting pin 0.75-0.90 mm needle plate mechanical adjustment feed dog height to check: 1. Lower the presser foot. 2. Turn the handwheel toward you to bring the feed dog to its highest position. The height of the feed dog from the needle plate should be 0.75-0.90mm. If it is not in the range, ...
16 setscrew (a) needle bar tip of shuttle hook meets left side of needle 2.9–3.5 mm mechanical adjustment needle bar height to check: when the tip of shuttle hook meets the left side of the needle in ascending travel of the needle from its left and lowest position, the distance between the top of th...
17 lower shaft crank arm setscrews (a) (2 pcs.) 1.45-1.95 mm lowest position lower shaft mechanical adjustment needle timing to shuttle to check: the height of the needle point from its lowest point of travel should be in the range of 1.45-1.95 mm when the tip of the shuttle hook just meets the left...
18 a b forward feeding backward feeding adjusting screw (d) (c) cap notch mechanical adjustment buttonhole feed balance to check: when sewing buttonhole, the stitches on each side of buttonhole should be the same stitch density. The range of 9-12 stitches in the right side row "backward feeding" aga...
19 (d) (c) stretch stitch adjusting screw a=b a>b a cap notch a a 1 2 3 b a a 1 2 3 b a a 1 2 3 b mechanical adjustment feed balance on stretch stitch to check: if the stretch stitch patterns are distorted with setting the stitch length dial at " s.S. ". (in case of being a difference between forwar...
20 adjusting screw (d) (c) backward feeding forward feeding stitch length dial mechanical adjustment bartack feed of buttonhole to check: if the material is fed forward or backward when sewing bartack on buttonhole, make an adjustment as follows: adjustment procedure: 1. Set the pattern selector dia...
21 0.3mm setscrew (a) pattern selector cam zz cam adjusting plate release arm release arm mechanical adjustment bartack feed of buttonhole to check: too narrow clearance between the cam follower and the top convex of zigzag cam may often cause difficulty in turning of the pattern selector dial, or c...
22 mechanical adjustment motor belt tension to check: 1. If the motor belt tension is too tight or too loose, it can cause a belt noise: if the tension is too toight, it can cause the machine to run slowly and the motor to overload; if the tension is too loose; it can cause the belt teeth on the mot...
23 (a) (a) arm machine socket unit (b) machine socket cover wiring 1. Remove the belt cover. (see page 4.) 2. Remove the screws (a), (b) and machine socket cover. 3. Follow the above procedure in reverse. Motor cord lamp cord motor cord lamp cord 240v 120v.
