CONTENTS TROUBLESHOOTING ....................1 - 3 SERVICE ACCESS (1) FACE COVER, BELT COVER ............. 4 SERVICE ACCESS (2) BASE PLATE ................5 SERVICE ACCESS (3) FRONT COVER ................6 SERVICE ACCESS (4) REAR COVER ................7 TOP TENSION ........................8 BOBBIN TENSION ......................
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 needle and thread.
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.
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.
SERVICE ACCESS FRONT COVER 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.
SERVICE ACCESS REAR COVER 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 on the cover.
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.
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 range, adjust it as follows: ADJUSTmENT PROCEDURE: 1.
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.
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). ADJUSTmENT PROCEDURE: 1.
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 PROCEDURE: 1.
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.
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.
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, adjust as follows.
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 the needle eye and the tip of the shuttle hook should be in the range of 2.9-3.5 mm.
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 side of the needle at the left needle position. ADJUSTmENT PROCEDURE: 1.
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" against 10 stitches in the left side row "forward feeding"...
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 forward feeding and backward feeding during stretch stitch pattern sewing), make an adjustment as follows: ADJUSTmENT PROCEDURE: 1.
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 dial at " ", and the stitch length dial at "4". 2.
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 can not correct pattern. ADJUSTmENT PROCEDURE: 1.
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 motor pulley to jump.
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. Machine socket cover Machine socket unit 120V 240V Motor cord Lamp cord Lamp cord Motor cord...