SERVICE MANUAL FOR COMPUTERIZED SEWING MACHINE ESp
Contents
1. nennt ELECTRONIC PARTS ARRANGEMENT CONTROL SYSTEM BLOCK DIAGRAM akon nan E aaa MAIN MOTOR CONTROL EM ME ERE basi ainsin Ib Eh pes PATTERN GENERA ish AUTOMATIC THREAD OTHER ELECTRONIC COMPONENT FUNCTIONS NPP ee SS MECHANICAL CHART 1 yeys yeus pee jeyuozuoH ju0ZHOH esjnd pee epis eje d jejuozuoH jquuesse yooy JOJOW rae pueys pase pee 4 uoisue pol peeJ Bunoeuuoo 617 pee Jojow Biz e jnd p VM eouejeg N AND N j lt Aging yeys dn aye Jeuoddns 19 dn exej Jojow2. NP PC board Speed volume ER RI i Needle position B pes i sensor sensor Main PC board 34 5 H7060088
3. 15 ens 8 59 2g 22 TS 22 c 5 2 m A 2 5 9 5 m o a c IS 5 o en o o m A oz 3 2 28 S T g 5 e 16 QUA 59 4 Lamp Inlet assembly Power supply unit HOW USTMECHANICAL ELEM ENTS 1 SETTING THE TEST MODE RARE 18 2 TENSION OF MOTOR BELT AND TIMING 18 3 NEEDLE DOWN POSITION ADJUSTMENT eere 19 4 TIMING OF NEEDLE AND ROTARY HOOK CLEARANCE BETWEEN THE NEEDLE AND THE ROTARY HOOK POINT 19 NEEDLE l EE a iet thai aint GE EY abb Pid 20 6 LOWER SHAFT AR seii 20 7 FRONT BACK LEFT RIGHT POSITION OF FEED 21 HEIGHT OF FEED DOG 21 3 PRESSER BAR HEAP f 22 10 CHECKING DETECTION OF FABRIC THICKNESS 22 11 POSITION OF BUTTONHOLE SWITCH LEVER 23 ta BOBBIN WINDER 23 13 INNER ROTARY HOOK BRACKET
4. Distribute evenly to the left and right 8 HEIGHT OF FEED DOG STANDARD When the balance wheel is turned to raise the feed dog to its highest position the standard height of the feed dog above the needle plate should be 0 9 1 1 mm ADJUSTMENT 1 the balance wheel to raise the feed dog to its highest position 2 Loosen the screw securing the vertical feed roller shaft 3 the vertical feed roller shaft to adjust the feed dog height to within 0 9 1 1 mm 4 Tighten the screw securing the vertical feed roller shaft 0 9 1 1mm 9 PRESSER BAR HEIGHT STANDARD The clearance from the needle plate top to the bottom of the presser bar should be 7 0 7 5 mm ADJUSTMENT 1 Raise the presser foot lifter 2 Loosen the screw of the presser bar guide bracket 3 Adjust the height of the presser bar by moving it vertically 4 Tighten the screw of the presser bar guide bracket NOTE The presser foot should be parallel to the feed dog hole of the needle plate 10 CHECKING DETECTION OF FABRIC THICKNESS STANDARD When the fabric thickness is set to 0 mm and mm in test mode 2 the buzzer should sound twice if operation is normal ADJUSTMENT 1 Select test mode 2 Fabric thickness setting 2 Install the J presser foot and then lower the presser foot and set the needle C am bar to the lowest position 3 Press 0 mm on the display The buzzer should sound twice Insert a spacer with a
5. v ione Jeynys 2 2 POWER TRANSMISSION CHART A Generating mechanism of needle bar thread take up lever and zigzag movements take up Taea take up H Upper shaft Balance wheel Needle bar crank rod Needle bar clamp SEES Needle bar release lever block assembly Needle bar Zigzag Zigzag pulse Needle connecting rod motor Upper shaft Balance wheel Needle Needle bar block assembly Needle bar release lever Zigzag pulse motor Needle bar crank rod Needle bar clamp Zigzag connecting rod Needle bar supporter Needle bar at Needle B Mechanism of feed dog and rotary hook movement Horizontal cam pulley Balance wheel Rotary hook Timing belt Feed rod assembly Lower shaft Vertical feed Lower shaft Timing pulley D Feed regulator Feed pulse motor gear cam Drop plate Horizontal feed Horizontal feed Horizontal feed Feed stand plate shaft arm Side feed plate Side feed pulse Feed dog spring Side feed plate Balance wheel Upper shaft Horizontal cam pulley Timing belt Feed pulse motor Timing pulley D Rotary hook assembly EE Vertical feed cam Drop plate Lower shaft Horizontal feed arm Side feed plate spring Feed stand Side feed plat
6. Does switch on SS PC board remain pressed Adjust or exchange SS PC board selected assembly 2 When the foot controller is connected does it remain 2 Check foot control unit operation depressed 3 Others 3 Replace LCD module or main PC board 4 Main motor does not 1 Does balance wheel rotate easily 1 Adjust mechanical positions to run reduce the heavy torque 2 Is main motor connector CN2 on power supply unit 2 Check connector connection attached properly 3 Is resistance of both ends on main motor connector 3 Replace main motor CN2 on power supply unit 120V spec 30 500 or 220 240V spec 110 1500 4 Do start stop switch backstitch switch needle 4 Replace SS PC board assembly position switch and thread cutter switch operate correctly Resistances between ends of each switch should be under 10 when switch is pressed infinite when switch is released 5 Is presser foot lifter lowered Does presser foot 5 Check fabric thickness detection or switch operate correctly replace fabric thickness sensor When presser foot lifter is lowered voltage between assembly pins 2 1 of fabric thickness detector CN6 is under 2VDC When presser foot lifter is raised it is over 3VDC 6 Others 6 Replace main PC board or power supply unit assembly 30 5 Operation of main motor is not stable maximum speed When turning on power and moving speed slide does voltage between pins 3 and 2 of connect
7. Remove the three springs and the needle bar block assembly Remove the two screws and the ZPM assembly 19 20 21 22 23 24 25 26 Remove the two screws and the thread cutter unit Remove the screw and the inner rotary hook bracket Remove the presser bar clamp screw Remove the presser bar by lifting it above and the presser bar clamp Remove the presser spring screw and the presser bar spring Remove the presser lifter by pulling the presser lifting shaft straight out from the front Pull the tension releaser plate out forward Remove the screw and the thread take up shaft 10 27 28 29 30 31 32 33 34 35 36 Remove the two screws securing the upper shaft metal and the upper shaft assembly Remove the screw and the N P board assembly Remove the screw and the tension pulley holder Remove the two feed rod tension springs Remove the metal presser screw and horizontal feed shaft bracket screw and then remove the horizontal feed assembly Remove the two screws and FPM holder assembly Remove the screw and the outer rotary hook assem Remove the two metal presser screws and remove Remove the three screws and base plate assembly bly the lower shaft assembly and timing belt Remove the connector the two screws and the power supply unit assembly 11 37 38 39 40 41 42 43 44 45 46 Attach the base plate using the three screws Attac
8. the rotary hook point should be positioned at the right side of the needle The clearance between the needle and the rotary hook point should be 0 1 mm or less and they should never touch each other ADJUSTMENT 1 Select test mode 5 2 Loosen the three screws of the lower shaft gear 3 Adjust the clearance between the needle and the rotary hook When the needle is raised 2 9 3 3 mm from its lowest position the rotary hook point should be positioned at the right side of the needle 4 Tighten the three screws of the lower shaft gear 5 Turn the adjusting screw and set the clearance between the needle and the rotary hook point to 0 1 mm or less Make sure that the needle does not make contact with the rotary hook point 19 5 NEEDLE BAR HEIGHT STANDARD When test mode 5 is selected turn the balance wheel so that the needle meets the rotary hook point At this time the clearance between the upper end of the needle eye and the bottom of the rotary hook point should be 1 0 1 4 mm ADJUSTMENT 1 Select test mode 5 2 Turn the balance wheel so that the needle meets the rotary hook point 3 Loosen the screw of the needle bar block assembly 4 Move the needle bar vertically to adjust the clearance to between 1 0 1 4 mm 5 Tighten the screw of the needle bar block assembly NOTE The needle clamp should be parallel to the side of the needle plate If the needle bar is loose when you adjust the needle ba
9. thickness of 3 mm beneath the J presser foot 5 Press mm on the display The buzzer should sound twice NOTE If the values read in steps 3 and 5 are normal the buzzer will sound twice each time If they are not normal the buzzer will sound four times each time gt 22 11 POSITION OF BUTTONHOLE SWITCH LEVER STANDARD When the buttonhole lever is lowered the clearance of front part of buttonhole foot is 1 5 mm and the presser foot lever is lowered BH 0 should touch BH 1 ADJUSTMENT 1 on power switch and select patterns Fit the buttonhole foot A Adjust the clearance to 1 5 mm and lower the presser foot lever 3 Adjust the position of buttonhole lever so that BHO touches BH1 when the buttonhole eccentric shaft is rotated NOTE In case that the legs are shorter than the standard bend the BH 1 to be far from BH 0 9 In case that the legs longer than the standard bend the BH 2 to be close to BH 0 12 BOBBIN WINDER STANDARD The thread should be wound parallel to the bobbin and around about 85 90 of the bobbin at low speed The clearance between the bobbin winder switch and the bobbin winder assembly should be 0 5 1 0 mm ADJUSTMENT 1 Loosen the bobbin winding guide screw 2 Adjust the bobbin thread amount so that the thread is evenly wound around the bobbin by moving the bobbin winding guide vertically 3 Tighten the bobbin winding guide screw Loosen the screw securing
10. turn the needle threader position setter slightly to the left to make it parallel In addition if the needle threader position setter is turned too far so that it is still not parallel too left it may hit other parts causing damage refer to Fig 2 If a Top of hook part is damaged it must be replaced If no part is damaged loosen the screw securing the needle threader position setter and turn the needle threader position setter slightly to the right to make it parallel 9 Top of needle eye Omm 28 IV HOW TO UST ELEC TRONIC ELEMENTS 1 When power is turned on buzzer does not sound and nothing appears display c 30 2 After the power is turned on pulse motors do not return to their home positions with respect to the needle position 30 3 Pattern cannot 5 30 4 Main motor does 30 5 Operation of main motor is not stable maximum speed operation is not possible or speed cannot be adjusted 31 6 Correct patterns are not 31 7 Buttonholes are not stitched correctly 31 8 Manual operation of feed and
11. used the pattern may not be sewn correctly due to the particular sewing conditions Do not use the needle threader without gaining a thorough understanding of how to use it otherwise the needle threader may be damaged or needle threading may not be possible Be sure to read and understand the following so that you can handle customer complaints NOTE 1 Needle threader accepts only circled needle and thread combinations 2 Combinations marked with a are not recommended since they might lead to the breakage of needle threader imperfect performance 3 Lower the presser foot when you use needle threader Nylon transparent thread is applicable in needle 18 NEEDLE THREADER 14 16 Do not turn the balance wheel when using needle threader Do not lower the needle threader lever while the machine is running If it is lowered the needle threader may be broken rendering it unusable Besides this it may cause the needle to break which could result in injury If a 9 needle is used the variation in needle precision may result in the needle being slightly difficult to thread Needle should be located above needle plate by more than 8 mm for threading Needle threader does not work when you use the side cutter Thread the needle before attaching the side cutter CHECKING THE HOOK POSITION IN HORIZONTAL DIRECTION STANDARD The measure from inside of the hook guard to the center point of hook is 0 42 mm CHEC
12. zigzag pulse motors is not possible 31 9 Vertical movement of needle bar and backstitch operation are abnormal 31 10 Foot controller does not operate normally when depressed 31 11 Thread tension iS HOE GO BOL 32 12 Needle bar release mechanism does not operate correctly 32 13 Thread cutter does not operate correctly 32 14 Display does not appear clearly 32 15 Ihe LOD light does decks a nasa put inet Lg pb 32 16 Thread cannot be wound around bobbin 32 17 Needle thread breakage detector does not operate correctly 32 29 HOW ADJ UST ELEC TRONIC ELEM ENT You must turn off the power and remove connectors from printed circuit boards before measuring resistance PROBLEM CHECK REMEDY 1 When power is turned 1 Has the display contrast been adjusted 1 Adjust the contrast on buzzer does not 2 If the voltage between both inlet terminals is 2 Replace the power cord sound and nothing measured when the power cord is plugged in is the appears on display standard voltage 120 VAC 220V 230V 240V displayed 3 When power switch is set to on is resistance b
13. AND MAIN PARTS Remove the screw securing the face plate and the face plate by sliding it to the left Remove the screw securing the free arm cover and the free arm cover by sliding it to the left Remove the blind cap on the belt cover the screw securing the belt cover and the belt cover from below by sliding it to the right Remove the two screws securing the base cover slide the base cover to the left and then holding the front slide it to the left and out Remove the screw securing the front cover near spool pin and loosen the two screws below jaw section on face plate side below free arm Open the front cover toward the front remove the four connectors and then the front cover Remove the two screws securing the needle plate and the needle plate Remove the three screws securing the rear cover and the rear cover from the rear side 10 11 12 13 14 15 16 17 18 Remove the presser holder and needle Remove the 11 connectors the two screws and the main PC board Remove the two screws and handle holder assembly Remove the screw and thread winding assembly Remove the motor belt and pull out the motor connector Remove the two screws and the main motor Remove the screw and the board set plate D Remove the side feed plate spring the three screws and the SPM holder Remove the two screws and pull out the thread guide cover from the tension link Remove the screw and the H block shaft holder assembly
14. K As sewing needle HA X1 14 is standard so prepare five brand new sewing needles HA X1 14 and check by changing all of these After Checking 1 In that hook goes through eyelet of all needles nini There is no problem 2 In case that hook does not go through eyelet of all needles Adjust by bending hook 3 that hook does not go through eyelet of some needles Needles through which the hook does not go Example for checking through are defective When you check five brand new sewing needles HA X1 9 on condition that it achieves above first case if the hook does not go through eyelet of all of these needle all five needles are defective and you judge the hook position is not defective ADJUSTMENT In case the hook is defective after above checking adjust the hook by bending with pliers Do not bend the hook guard at this time 19 NEEDLE THREADER EXCHANGE HOW TO EXCHANGE NEEDLE THREADER 1 Remove the needle and lower the presser foot 2 Push down the needle threader and take it out 3 Place anew one so that the guide is immediately under the groove as shown in figure 4 Push the needle threader all the way up so that the guide is fits into the groove La D m Guide D E Figure amp 20 NEEDLE THREADER CHECKING THE HOOK IN STANDARD POSITION STANDARD 1 clearance between the top of hook and the top of needle eye is 0 mm 2 Th
15. POSITION 24 14 LARGE ONE POINT PATTERN SHAPE SOFT ADJUSTMENT 24 15 FEED ADJUSTMENT VERTICAL FEED 25 16 INNER ROTARY HOOK TENSION sccissiiescescetssssacssssnsecsssssennecasssanesancsssctasnanenesasede 25 17 NEEDLE 26 18 NEEDLE THREADER CHECKING THE HOOK POSITION IN HORIZONTAL DIRECTION 26 19 NEEDLE THREADER nnne nennt nnne 27 20 NEEDLE THREADER CHECKING THE HOOK IN STANDARD POSITION 27 21 NEEDLE THREADER CHECKING THE HOOK POSITION IN VERTICAL DIRECTION 28 275 1 SETTING THE TEST MODE BASIC TEST MODES To set the test mode turn on the power switch while holding down the start stop button and backtack button simultaneously Numerals will appear on the touch panel The respective test mode will be entered when the numeral is pressed Test Mode No Adjustment Item Checking detection of fabric thickness 24 25 71819 1718 19 Timing of needle and rotary hook ERE Horizontal position of feed dog The other test modes are used for factory adjustments 22 Needle down position 2712829 21 2 TENSION OF MO
16. Pattern adjustment 8 ot 1mm or less 1mm or less 24 15 FEED ADJUSTMENT VERTICAL FEED STANDARD Adjustment of the pattern should be possible in test mode 3 ADJUSTMENT 1 Loosen the screw securing the pulse motor 2 Rotate the pulse motor and adjust the pattern Make sure not to contact the main PC board during the adjustment 3 Tighten the screw securing the pulse motor Retract ee Advance 16 INNER ROTARY HOOK TENSION STANDARD While slowly pulling polyester thread 60 using a tension gauge inner rotary hook tension should be 10 120 The difference between this and the tension for silk thread 480 should be 2 3g ADJUSTMENT 1 Pass polyester thread 60 through the inner rotary hook correctly and pull it using the tension gauge 2 Adjust the tension by turning the screw to either the right or left using a screwdriver NOTE After adjusting the tension lock the screw with paint Polyester thread 60 10 12g 25 17 NEEDLE THREADER USING THE NEEDLE THREADER There are a wide variety of different needles and sewing machine threads available The right ones should be selected in accordance with the sewing conditions The accessory needle threader is designed to make threading of needles easier but it cannot handle every single circumstance of use combinations of needle and thread that may occur It can be used with some combinations but not with others and if it can be
17. SERVICE MANUAL FOR COMPUTERIZED SEWING MACHINE 5 9 1997 GENERAL INFORMATION This service manual has been compiled for explaining repair procedures of ESp This was produced based on up to date product specifications at the time of issue but there may have been changes of specifications for the purpose of improvements Contact manufacturer or local sales company for information concerning such changes 1 PRINCIPAL MECHANISM siisssssisiscecsiciscaniintiseassiacasestiacisieniadicanscutiianascceisaniandincntiaiinds 1 DISASSEMBLING AND REASSEMBLING THE SEWING MACHINE 7 HOW TO ADJUST MECHANICAL ELEMENTS eere 17 IV HOW TO ADJUST ELECTRONIC 29 CAUTION Always use rubber gloves when handling printed circuit boards and never touch the metal portion of a printed circuit board with bare hands 2 Keep your body earthed in order to avoid generating static electricity 3 Pack printed circuit boards in aluminum foil and avoid subjecting them to any form of impact during storage or transportation 4 Do not touch or damage the metal portion of a printed circuit board with a screwdriver or any other tool while making repairs or the like I PRINCIPALMECHANISMS MECHANICAL CHANT ies esr dba EIE DE a FE et reb EFEEUE E SEED E ED Ov IAN RERO POWER TRANSMISSION
18. TOR BELT AND TIMING BELT STANDARD Motor belt There should be a 4 6 mm slack in the motor belt 1 Loosen the two screws securing the motor holder when the center of the motor belt is pressed with a 2 Adjust the belt tension by moving the motor holder force of 200g 3 Tighten the two screws There should be a 3 4 mm slack in the timing belt when it is pressed with a force of 200g ADJUSTMENT Timing belt 1 Loosen the screw of the belt adjusting pulley 2 Adjust the position of the belt adjusting pulley 3 Tighten the screw of the belt adjusting pulley 18 3 NEEDLE DOWN POSITION ADJUSTMENT STANDARD When test mode 4 is selected the needle should be exactly at the middle of the needle plate hole in the needle down position ADJUSTMENT 1 Select test mode 4 2 Turn the balance wheel to move the needle to the needle down position 3 Loosen the screw securing the zigzag adjusting nut 4 Turn the balance wheel to move the needle to the left and right and then turn the zigzag adjusting nut by using the box wrench to set the needle in the center of the needle hole Tighten the screw securing the zigzag adjusting nut 6 Turn the balance wheel and check the needle down position e S point needle drop CJ 4 TIMING OF NEEDLE AND ROTARY HOOK CLEARANCE BETWEEN THE NEEDLE AND THE ROTARY HOOK POINT STANDARD When test mode 5 is selected and the needle is raised 2 9 3 3 mm from its lowest position
19. ate correctly 2 Are resistances between pins 1 3 and 2 4 of 2 Replace Z pulse motor or ZPM lead connector CN2 for zigzag pulse motor 8 to 10 wire assembly 3 Others 3 Replace main PC board assembly 13 Thread cutter does not 1 Does the thread cutter move lightly 1 Adjust the thread cutter mechanism operate correctly 2 Are resistances between pins 1 3 and 2 4 of 2 Replace F pulse motor or FPM lead connector for feed pulse motor 8 to 10 wire assembly 3 Others 3 Replace main PC board assembly 14 Display does not 1 Is the voltage between pins 8 7 of the connector 1 Replace main PC board assembly appear clearly CN9 for LCD module 5 to 10VDC 2 Others 2 Replace LCD module or main PC board assembly 15 The LCD light does not 1 Is the voltage between pins 4 5 20 to 30 VDC when 1 Replace the power board assembly light the connector CN7 which is output from the power board is disconnected 2 Is fuse blown 2 Replace fuse after correctly defect 3 Is the voltage between pins 9 10 of the LCD module that caused fuse to blow connector CN9 approx 9 VDC 3 Replace main PC board assembly 4 Others 4 Replace LCD module assembly 16 Thread cannot be 1 Is resistance between both ends of connector CN15 1 Replace bobbin winder switch wound around bobbin for bobbin winder switch under 1 O when thread is assembly wound or infinity in other cases 2 Adjust bobbin winder position 2 bobbin win
20. der attached correctly 3 Others 3 Replace main PC board 17 Needle thread 1 When passing thread through thread route and setting 1 If condition does not change after breakage detector does thread condition as follows is voltage between pins 2 adjusting thread take up spring not operate correctly 1 of connector 8 for needle thread breakage replace needle thread breakage detector correct detecting PC board When thread is tensioned 0 VDC When thread is loose 5 VDC 2 Others 2 Replace main PC board 32 Main PC board supply PC boa CNI2 55 P CNQ LCD module Power supply unit CNIS Bobbin switch rd CN14 Foot controller unit side feed pulse motor CN2 Zigzag pulse motor CN8 CN6 CN3 Needle Potentio Thread tent ion pulse motor thread meter detector Feed pulse motor CN7 CN5 BH Needle switch Position PC board Main e PC board Lame CN4 Power supply board Fuse 120V T3 15A 220 240V T5A Transformer Fuse 120V 3 15 220 240V T2A n CN2 Main motor Main PC board 33 LCD unit LCD module Main PC board Touch panel Main PC board CN11 Other PC boards 985
21. e Side feed pulse motor Lower shaft gear Horizontal feed plate Horizontal feed shaft gt ELECTRONIC PARTS ARRANGEMENT CHART SS start stop Bobbin winder switch board NP needle position Needle thread board breakage detector Thickness sensor of fabric 22 a Buttonhole BH change switch assembly Buttonhole BH lever switch Lamp Inlet assembly Power supply unit CONTROL SYSTEM BLOCK DIAGRAM Control system block diagram Backlicoht power supply circuit Bobbin SW Contrast o circuit BH SW 1 t 1 1 l Motor control circuit Speed VR M60013 i 0194FP 1 CETT supply Needle 1 circuit tareng detector Ibo board o 1 M37732 MTD2003F Pulse motor Speed S4AFP n E AET 6 1 Y Feed NP sensor 1 EEPROM Buzzer suits moto 8 24508 821 Foot i circuit tension MT02003F 1 pulse motor Touch panel 3 Side feed 1 pulse motor Main PC board Gk ea nae RM NIRE Mu E 5 MAIN MOTOR CONTROL The main motor for the sewing machine is required to smoothly change from low speed to high speed without any fluctuations due to load or te
22. ead tension is calculated based on the feed zigzag width fabric thickness and the appropriate needle thread amount fed by the thread tension pulse motor This always gives you the correct thread tension regardless of thread kinds of fabric or sewing speed Automatic thread tension block diagram Needle thread feed mechanism Thread tension selecting switch Touch panel Thickness sensor of fabric Pattern data ROM Drive circuit 8 OTHER ELECTRONIC COMPONENT FUNCTIONS Start stop switch Backstitch switch Needle position UP DOWN switch Automatic thread cutter switch Touch panel Buttonhole stitch switch Buttonhole stitch lever switch Rotation sensor Speed sensor Bobbin winder switch Junction for foot controller Transformer used to start and stop SS the machine If you want to start sewing at low speed keep this switch depressed and start sewing used for backstitching and lockstitching Backstitching is performed at low speed in the reverse direction while the switch is pressed For lockstitching three stitches are made at the current needle position and then sewing stops used to change the needle position either up or down used to cut the thread automatically When you press this switch the machine will automatically cut the thread regardless of the needle position and stop with the needle at its upper position
23. embly using the three springs Insert the needle bar clamp into needle bar crank rod Attach the H block shaft holder using the screw Insert the needle bar block arm into the pin on the needle bar block While inserting the thread guide cover assembly into the thread release link attach using the two screws Attach the SPM holder assembly using the three screws and couple the horizontal feed shaft and side feed plate using the side feed plate spring Attach the set plate D using the screws Connect the motor connector attach the main motor using the two screws and catch the motor belt Attach the bobbin winder assembly using the screw Attach the handle holder assembly using the two screws Attach the main board assembly using the two screws Connect the 11 connectors Attach the presser holder and needle 14 66 67 68 69 70 71 72 Attach the rear cover using the three screws Attach the needle plate assembly using the two screws Connect the four connectors and attach the front cover using the three screws Insert the base cover into the base plate and attach using the two screws Attach the belt cover using the screw and fit the blind cap on Attach the free arm cover using the screw Attach the face plate using the screw 15 2 LEAD WIRE ARRANGEMENT Main PC board o amp amp en c 9 E g 2
24. etween 3 Replace power supply unit both ends less than 1 assembly 4 Remove connector CN13 from the power supply 4 Replace power supply unit board and check following voltages using a tester assembly Voltage between pins 2 and 3 should be 5 VDC Voltage between pins 4 and 5 should be 20 to 30 VDC 5 Is fuse blown 5 Replace fuse after correcting defect that caused fuse to blow 6 Others 6 Replace main PC board assembly After the power is turned on pulse motors do not return to their home positions with respect to the needle position Are the resistances between the connector pins given below normal for the pulse motors which do not return to the home position Zigzag 2 1 3 2 4 gt 8 10 Q Feed CNA 1 3 2 4 gt 8 10 0 Horizontal CN1 1 3 2 4 gt 8 10 Q Replace the pulse motor which shows an abnormality Zigzag pulse motor 2 Set the home position for the same pulse motors 2 Replace NP board assembly when needle bar is irrespective of needle position raised and feed and 3 Is a fuse blown 3 Replace fuse after correcting defect side feed pulse motors that caused fuse to blow when needle bar is 4 Is the voltage between pins 4 5 normal when the 4 Replace power supply unit lowered connector CN13 which is output from the power assembly supply board is disconnected Between 4 5 20 30 VDC 5 Others 5 Replace main PC board assembly Pattern cannot be
25. h the power supply unit assembly using the two screws and insert the inlet connector While attaching the timing belt assembly the lower shaft assembly using the metal presser and screw Position the outer rotary hook and three spacers with the lower shaft assembly refer to following illustrations and attach using the screw Attach the FPM holder assembly using the two screws Attach the horizontal feed shaft bracket using the screw and attach the horizontal feed assembly using the metal presser and screw Insert the shaft of the feed rod into the feed block and catch the two feed rod tension springs Attach the tension pulley holder using the screw Attach the N P board assembly using the screw Insert the timing belt over the upper shaft and attach using the metal presser and two screws 12 47 48 49 50 51 52 53 54 Attach the thread take up shaft using the screw Insert the tension releaser plate Attach the presser spring using the collar and screw Insert and attach the presser foot lifter using the presser lifter shaft Insert and attach the presser bar into the presser bar clamp Attach the presser bar spring onto the presser bar clamp Attach the inner rotary hook bracket using the screw Attach the thread cutter unit using the two screws 13 55 56 57 58 59 60 61 62 63 64 65 Attach the ZPM holder assembly using the two screws Attach the needle bar block ass
26. mperature changes To fully comply with this requirement this model adopts PWM control using FET 6 PATTERN GENERATOR For conventional sewing machines the pattern was generated by rocking the needle bar and the feed regulator by means of a pattern cam onto which the pattern data had been mechanically engraved In contrast to this this model stores the data electronically in memory and uses a feed pulse motor side feed pulse motor and a zigzag pulse motor to directly rock the needle bar and the feed regulator to generate the pattern In addition the pulse motors must move the position of the needle while the needle is raised and stop it in the correct position and similarly they must move the position of the feed regulator while the needle is lowered Thus highly precise positioning and a fast response speed are required Because of this the feed pulse motor side feed pulse motor and a zigzag pulse motor were adopted and a simple open loop structure circuit was employed Block diagram of pattern generator control ARN Needle bar Pattern selecting switch Drive circuit mechanism Touch panel Gate Needie bar release mechanism Drive circuit Feed mechanism Pattern data ROM Side feed Drive circuit mechanism 7 AUTOMATIC THREAD TENSION On former models the operator adjusted the thread tension of the needle and bobbin threads by changing the pressure between the tension disks On this model however the thr
27. or CN10 for speed slide change from 0 to 5 VDC Replace VR board assembly operation is not 2 When turning balance wheel do voltages between 2 Replace NP board assembly possible or speed pins 2 1 pins 4 1 pins 5 1 and 6 1 of connector CN5 cannot be adjusted for NP board change to either 0 or 5 VDC 3 Others 3 Replace main PC board 6 Correct patterns are 1 If the power is turned off and the needle bar is moved 1 Adjust the installation position so not created horizontally by hand does it move easily that it moves easily 2 Are the resistances between the connector pins for 2 Replace pulse motor or lead wire the zigzag feed and side feed pulse motors normal assembly Zigzag 2 1 3 2 4 2 8 10 0 Feed 1 3 2 4 8 10 Side feed 1 1 3 2 4 2 8 10 0 3 Do the voltages between pins 2 1 5 1 and 6 1 of the 3 Replace NP board assembly N P board assembly connector CN5 alternate between 0 5 VDC when the sewing machine is turned slowly 4 Others 4 Replace main PC board assembly 7 Buttonholes are not 1 Is the stitch foot set correctly 1 Check stitch foot stitched correctly 2 Is the resistance between pins 4 5 of the BH switch 2 Adjust button hole lever or replace connector CN7 normal BH switch assembly When buttonhole lever is lowered 1 or less When buttonhole lever is raised oo 3 When the bu
28. r height it may result in sewing troubles 0 9 1 3mm 6 LOWER SHAFT 1 Attach the bushing presser L temporarily so as the center of lower shaft is positioned higher by 1 mm against the center of eccentric metal 2 Install the outer rotary hook then turn the eccentric metal and make sure that there is no backlash on the gears 3 Tighten the screw on the bushing presser L 20 7 FRONT BACK LEFT RIGHT POSITION OF FEED DOG STANDARD When test mode 6 is selected move the feed dog front back and left right At this time the feed dog should not contact the needle plate When the front back position is the maximum feed amount the clearance between the feed dog and needle plate at the feed start position when feed dog is at very front should be 0 5 to 1 0 Refer to illustration ADJUSTMENT Select test mode 6 Loosen the screw securing the horizontal feed plate In the test mode align the feed dog s left right position rumpere ES Tighten the screw securing the horizontal feed plate g B Move to the feed start position in the test mode Loosen the screw securing the horizontal feed arm Set the clearance between the feed dog and needle plate to 0 5 to 1 0 Tighten the screw securing the horizontal feed arm After adjusting press the thread cut button and confirm that the thread cutter operates correctly If the thread cutter does not operate readjust the feed dog slightly to the back Q 0 0 O0 0
29. reading is possible when needle is located higher than 8 mm from the needle plate CHECK refer to illustration Case A Hook position is too high Hook hits needle and cannot go through needle eye Case B Hook position is too low Hook goes through needle eye but it catches bottom part of needle eye Needle Top of needle eye Omm Top of hook 21 21 NEEDLE THREADER CHECKING THE HOOK POSITION IN VERTICAL DIRECTION Case A Adjust needle threader position setter slightly down and check that the clearance between the top of hook and top of needle eye is 0 mm Case B Hook point is too low Adjust needle threader position setter slightly up and check the clearance between the top of hook and top of needle eye is 0 mm amp Needle threader position setter Check that the needle threader position and Needle bar the needle bar crank rod assembly D is parallel crank rod E r In case part and part is not parallel or the hook assembly does not work readjust needle threader by loosening the screw If and D are not parallel the needle threader will not be held by the needle threader position setter refer to Fig 1 the hook will not enter the eyelet of the needle hook will not move and the needle will not be threaded when the needle threader lever is lowered In Fig 1 Fig 2 this case loosen the screw securing the needle d threader position setter and
30. sm 4 Others 4 Replace main PC board assembly 10 Foot controller does 1 Is the resistance between pins 2 3 of the pin jack 1 Replace pin jack assembly not operate normally connector CN14 1 or less when there is no pin when depressed jack and when there is a pin jack 2 Does the resistance between pins 1 3 of the pin jack 2 Replace foot controller or jack connector CN14 change from the low range to 10 assembly when there is a pin jack and the foot controller is depressed 3 Others 3 Replace main PC board assembly 31 11 Thread tension is not 1 Is thread route correct 1 Check thread route correct 2 Are the 0 mm and mm fabric thickness adjustments 2 Check correct 3 Adjust or replace ATPM holder 3 Turn off power and lower presser foot When turning complete AT pulse motor gear manually does it turn easily and together with roller 4 Are resistances between pins 1 3 and pins 2 4 of 4 Replace AT pulse motor or ATPM connector for AT pulse motor 8 to 10 07 lead wire assembly 5 Is the voltage between pins 2 1 of the connector 5 Replace thickness sensor of fabric CN6 for the fabric thickness detection under 2 VDC assembly when the presser foot is lowered and over 3 VDC when it is raised 6 Others 6 Replace main PC board 12 Needle bar release 1 Does needle bar release mechanism operate 1 Adjust needle bar release mechanism does not smoothly mechanism oper
31. the bobbin presser slightly 5 Turn the bobbin presser to adjust the bobbin thread amount 6 Tighten the screw of the bobbin presser 7 Setthe bobbin winder assembly to the left 8 Loosen the screw of the bobbin winder Switch 9 Adjust the clearance between the bobbin winder switch and the bobbin winder assembly to 0 5 1 0 mm 10 Tighten the screw of the bobbin winder switch gt X ES 85 90 23 13 INNER ROTARY HOOK BRACKET POSITION STANDARD When the inner rotary hook bracket and the rotary hook meet the spring of the inner rotary hook bracket and the inner rotary hook should overlap each other by 1 9 2 1 mm ADJUSTMENT 1 Loosen the screw securing the inner rotary hook bracket 2 Adjust the position of the inner rotary hook bracket by moving it vertically and or horizontally NOTE Surface A of the inner rotary hook bracket should be perpendicular to the feeding direction 3 Tighten the screw of the inner rotary hook bracket the feeding direction surface A 1 9 2 1 14 LARGE ONE POINT PATTERN SHAPE SOFT ADJUSTMENT STANDARD When 3 pattern adjustment is selected in the test mode and the start button is pressed the vertical and horizontal separation of the pattern outline shape should be 1 mm or less ADJUSTMENT 1 Select 3 pattern adjustment the test mode 2 Press the start button and sew the outline shape of the pattern 3 Adjust the pattern
32. ttonhole lever is lowered and in the 3 Adjust button hole lever or replace conditions below is the resistance between pins 1 2 BH switch assembly and 2 3 of the BH switch connector CN7 normal Between 1 2 Between 2 3 Buttonhole lever is pulled forward 1 or less Buttonhole lever is pushed 1 Q less 4 Others 4 Replace main PC board assembly 8 Manual operation of 1 Do manual keys of feed and zigzag pulse motors turn 1 Replace LCD module feed and zigzag pulse off and on normally and do the LCDs change motors is not possible 2 Are the resistances between the pins below of the 2 Replace feed stepping motor feed and zigzag pulse motors normal zigzag stepping motor or lead wire Feed 1 3 2 4 gt 8 10 0 assembly Zigzag 2 1 3 2 4 2 8 10 0 3 Others 3 Replace main PC board assembly 9 Vertical movement of 1 Are the resistances between both sides of the SS 1 Replace 55 PC board assembly needle bar and board assembly switches 1 or less and in the backstitch operation range respectively when the switches are turned on are abnormal and off 2 Do the voltages between pins 2 1 4 1 5 1 and 6 1 of 2 Replace NP board assembly the NP board assembly connector CN5 alternate between 0 5V when the sewing machine is turned slowly 3 Is the bobbin winder switch turned off 3 Adjust the bobbin winder mechani
33. used to select pattern and input number required for sewing by simply touching the display on the panel This simplifies the operation for selecting the desired pattern and number used to detect the edges of the buttonhole stitch by means of the buttonhole stitch presser foot and lever used to detect whether the buttonhole stitch lever is raised or lowered detects the drive timing of zigzag feed side feed and thread feed pulse motor and detects the vertical position of the needle Also detects the turning angle of the upper shaft by means of a photointerruptor and shutter installed on the upper shaft used to detect the rotation speed of the main motor detects the operating speed of the main motor by means of a photointerruptor and shutter installed on the upper shaft used to detect whether the bobbin winder has been set when winding the lower thread when using the foot controller connect it to this terminal used for driving the pulse motors to illuminate the lamps and to supply power to the electronic circuitry II DISASSEM BLING AND REASSEMBLING THE SEWING MACHINE 1 DISASSEMBLING AND REASSEMBLING THE OUTER PARTS AND MAIN PARTS 8 2 LEAD WIRE 16 DISASSEMBLING AND REASSEMBLING THE OUTER PARTS
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