ELNA E9020 Service Manual
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ELNA E9020 Service Manual

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E9020
SERVICE MANUAL

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Summary of Contents for ELNA E9020

  • Page 1 E9020 SERVICE MANUAL...

  • Page 2: Table Of Contents

    CONTENTS [1] Product specifications for E9020........................1 [2] Technical explanation ............................4 [3] Index by troubles (mechanical troubles) ..................... 11 [4] How to disassemble the frame components ....................15 [5] Adjustment..............................17 1. Main unit of sewing machine ..............................17 2.
  • Page 3 [1] Product specifications for E9020 (2) General mechanism (1) Speed control device 1. Thread take-up lever ....One-touch utility thread eyelet link thread take- ™ Slide control system (soft start) and optional controller system up lever ™ Straight stitching ..........115 to 850 rpm 2.
  • Page 4 (4) Feed mechanism 1. Feed amount ......0 to 5 mm (in increments of 0.1 mm in the range from 0.2 to 1.0 mm, and 1.5 mm, 2.0 mm, 2.3 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4 mm, 4.5 mm and 5.0 mm) 2.
  • Page 5 9. Pattern selection Direct selection of patterns through a transparent touch panel and indication of selected pattern on LCD. 10. Number of patterns Practical patterns 53, Continuous patterns 34, Adherence one point 34, One point 168, Lettering characters 4 fonts 450, large pattern 31, practical one point 51 11.

  • Page 6: Technical Explanation

    [2] Technical explanation Sewing speed Max. sewing speed in high speed operation ....For straight stitching ............850 ± 50 rpm For embroidering (at high speed) ........800 ± 50 rpm Low sewing speed in high speed operation ....For bobbin winding ............750 ± 50 rpm Max.
  • Page 7 Automatic thread trimmer ™ In case of thread trimming, the machine stops with its needle up after turning the amount equivalent to make one and a half stitches (when the machine has stopped with its needle down) or two stitches (when the machine has stopped with its needle up). (115 rpm) ™...
  • Page 8 Needle throwing The needle throwing motion is controlled by transmitting an angle of rotation of the needle throwing STM shaft to the needle bar frame by way of link. The time to compensate the origin of STM is when the needle throws to the left stitch base line as long as the power to the machine is ON. When the STM is turned beyond the right stitch base line, the needle bar disengaging mechanism actuates.
  • Page 9 Embroidring device 1) The machine is fed, when embroidering, by the X feed STM and Y feed STM. An angle of rotation of each STM is transmitted, by means of a gear and belt, to the embroidery frame as a linear travel amount in X/Y direction. This causes the machine to sew an embroidery pattern. 2) When a large, medium or small embroidery frame is installed on the machine, three frame detection switches are turned ON or OFF, and the machine determinates the possible range of layout of the patterns that can be sewn in accordance with the size of embroidery frame, i.e., large, medium or small, installed.
  • Page 10 Memory 1) When a pattern or a letter is selected, it is automatically stored in memory. 2) The maximum number that can be stored in memory is 120. For the embroidery patterns, the number of patterns to be sewn changes in accordance with the size of the frame or the size of the patterns stored in memory, and the limit ofthe number of patterns stored in memory is automatically computed and set.
  • Page 11 5) The main shaft which has been disengaged stops at 40˚ to 50˚ by the main shaft disengaging stopper. 6) Main shaft returns from disengagement when the data other than the disengagement of main shaft occur (70˚), the needle throwing STM starts driving at 287˚ and the main shaft disengaging link moves to the waiting position.
  • Page 12 Automatic bobbin winding ™ Automatic bobbin thread winding from the exclusive thread (for embroidering only) Guide the exclusive bobbin thread which has been set to the front panel to the bobbin in the hook, rotate the bobbin and wind the thread. After completing the bobbin winding, threading to the inner hook and cutting of the needle thread are performed by means of the reverse rotation of the outer hook.

  • Page 13: Index By Troubles (Mechanical Troubles)

    [3] Index by troubles (mechanical troubles) Phenomenon Item to be checked Defective thread tension P-17 (2) Height of the presser foot P-20 (5) Inner hook detent P-20 (6) Height of the feed dog P-21 (8) Base tensio P-46 W. Adjusting the material thickness P-43, A Adjusting the actual feed amount P-26 (17) Bobbin thread tension Stitch skipping...
  • Page 14 Automatic needle threading (trouble and corrective measure) Trouble Cause Corrective measure Needle thread comes off the The set needle thread does not enter up Adjust the retaining pressure at the upper position referring to thread retaining section when to the root of shaft and is narrowly retained (24)-1-3).
  • Page 15 Trouble Cause Corrective measure Defective threading to the Malfunction of the threading body • Installing position of the face plate is improper. thread take-up spring and • The face plate inside cover is moved to the right. thread take-up lever (The face plate installing plate is slantly attached.) •...
  • Page 16 Automatic bobbin winding (trouble and corrective measure) Bobbin thread winding from the exclusive bobbin thread Trouble Cause Corrective measure Thread fails to be wound in The hook cocer is not attached. • Attach the hook cover. bobbin. Threading to the thread retaining plate is not correct. •...

  • Page 17: How To Disassemble The Frame Components

    [4] How to disassemble the frame components A. Face plate cover B. Belt cover • Loosen screws 1 and 2. • Remove screws 1, slantly insert • Remove claw section A and B a thin screwdriver into the hook- using a thin screwdriver or the ing section C and push in the di- like.
  • Page 18 F. Rear panel • Loosen screw 1 and • Remove screws 3 and 4. remove screw 2. • Lower presser lifting lever 5. • Lift handle 6, draw section 7 and remove the rear panel. • Remove claw section 8 with the under cover.

  • Page 19: Adjustment

    [5] Adjustment 1. Main unit of sewing machine (1) Needle entry How to adjust Disassembly Adjustment drawing A through E on page 15 Specify the straight stitching. (Bring Use service the needle to the left stitch base mode H to select line.) Loosen 1 and turn 2 to the pattern.
  • Page 20 (3) Height of the needle bar and the needle-to-hook timing How to adjust Disassembly [Confirming the timing between the main shaft and the hook driving shaft] Free arm bottom cover and throat plate • Confim that the needle bar is positioned in the lowest dead point when the marker dot on the thread cutter cam is aligned with the hook driving shaft ball bearing.

  • Page 21: Service Mode

    (4) Clearance between the needle and the hook How to adjust Disassembly • Confirm that the clearance is provided between the needle and blade point A to E on page 15 of hook. Loosen screw 1 and finely adjust the clearance by turning (At the time when adjusting the adjustment shaft 2.
  • Page 22 (5) Inner hook detent (longitudinal direction) How to adjust Disassembly Throat plate [Longitudinal adjustment] Loosen screw 1 in the inner hook detent, and align it with the [Enlarged view of the related portion] position in [Enlarged view of the related portion]. Location of components to be adjusted [Adjusting the direction of rotation of the inner hook] Refer to the item of the automatic bobbin winding.
  • Page 23 (7) Extension amount between the drawing roller and the auxiliary roller How to adjust Disassembly Adjustment drawing (A) A to F on pages 15 and 16 [Presser lifting lever] Adjustment drawing (A) Loosen screw 1 and move 2 up or down. Then adjust so that the extension amount between the drawing Location of components to be adjusted roller and the auxiliary roller should be 3 to 5 mm when...
  • Page 24 (9) Change-over of the drawing STM How to adjust Disassembly Adjustment drawing A to F on pages 15 and 16 Connect the connector of the front panel only, set the main shaft to 180˚, and turn ON “S” of the service mode in the state that the front Location of components to be adjusted panel and the rear panel are removed.
  • Page 25 (11) Position of the looper How to adjust Disassembly Adjustment drawing Pressing 4 in the direction of arrow, turn the hook Throat plate driving shaft pulley by hand to actuate the moving knife. Loosen 1 and adjust 2 so that the clearance Location of components to be adjusted provided between the looper and the moving knife base should be 0 ±...
  • Page 26 (13) Lateral adjustment of the thread trimming cam How to adjust Adjustment drawing Position where moving knife travels to the rightmost end. 0.3 to 1 mm 0˚ 180˚ • Keep pressing 2 with your • Slightly loosen nut 1. • Turn 3 and adjust so that the clearance provided finger, turn the sewing between the moving knife base and the looper is 0.3 to machine by hand.
  • Page 27 (15) Moving knife guide plate (lower) How to adjust Adjustment drawing Loosen screws 1 and 2 on the left stitch base line and tighten screw 2 to adjust so that the clearance provided between the needle and the moving knife guide plate (lower) is 0.5 to 1 mm. * When tightening screw 1, perform the adjustment of (14) Moving knife guide plate (upper).
  • Page 28 (17) Bobbin thread tension How to adjust Disassembly Adjustment drawing A tension gauge is necessary to measure the bobbin thread tension. Throat plate 0.127 to 0.147 N (14 g ± 1 g) Type of thread : SHAPPESPAN #60 Amount of thread to be wound round a bobbin : 40 to 50% Draw the thread Remove the inner hook.
  • Page 29 (19) Buttonholing How to adjust Disassembly Adjustment drawing Slightly loosen screws 3 and 4. move the buttonholing switch (BH SW) in the direction of the 0.1 to 0.3 Stopper arrow to adjust so that, when the buttonholing change-over lever is pressed against the projection of the buttonholing foot, the contact point on the stop side of the buttonholing switch (BH SW) is Contact spaced 0.1 to 0.3 mm from the stopper.
  • Page 30 (22) Motor belt How to adjust Disassembly Adjustment drawing Put the motor timing belt on the motor shaft pulley of the A to F on pages 15 and 16 sewing machine motor (asm.). Then adjust the belt tension by moving the motor up or down and after the adjustment, fix the belt with screws 1.
  • Page 31 (24) Automatic needle threading mechanism (24)-1 Adjusting the upper position of the transfer body How to adjust Disassembly 1) Loosen screw 2 and adjust with 1 so that the installing plane of the 2) Adjusting the origin detection circuit board transfer body is level when the clearance provided between the lower •...
  • Page 32 (24) - 2 Adjusting the lower position of the transfer body How to adjust Adjustment drawing 3) Vertical adjustment of the lower position Set the main shaft to 40˚ (marker dot on the hand wheel comes right When a thread is set to the transfer body and the transfer body is above).
  • Page 33 (24) - 3 Adjusting the height of the needle clamp threading arm How to adjust Adjustment drawing Loosen screw 1 and move 2 up or down so that the clearance provided between the needle clamp thread guide and the top end of needle clamp threading arm is 0.6 to 1 mm when pushing up the spring rack section of threading working body and turning the needle clamp threading arm.
  • Page 34 (24) - 6 Adjusting the position of the face plate How to adjust Adjustment drawing Loosen 2 and adjust the longitudinal position of face plate 1 so that the clearance provided between the threading body and the face plate is 1 to 2 mm when threading body 3 rotates and comes down to the position of the thread take-up spring guide section of the face plate.
  • Page 35 (25) Automatic bobbin winding (25) - 1 Adjusting the height of thread retaining plate A How to adjust Disassembly • Adjust thread retaining plate A following the procedure of (25) - 2 [Checking the working of thread retaining plate A] Free arm bottom cover and front panel Adjusting the inclination and the longitudinal position of thread After the adjustment, turn the bobbin thread intermediate gear by...
  • Page 36 (25) - 2 Adjusting the inclination and the longitudinal position of thread retaining plate A How to adjust Disassembly Throat plate [Adjusting the inclination] [Adjusting the longitudinal position] Loosen the thread retaining plate A setscrew and adjust so that the Adjust so that the narrowest clearance clearance provided between clearance provided between “U”...
  • Page 37 (25) - 3 Adjusting the position of the needle thread catching plate How to adjust Adjustment drawing Loosen the needle thread catching plate setscrew and slide the needle thread catching Needle thread catching plate plate to and fro to adjust so that the clearance is 0.3 to 1 mm at the position where the clearance provided between thread retaining plate A and the convex section of the needle Thread retaining plate A thread catching plate is minimized when making thread retaining plate A work by hand...
  • Page 38 (26) Easy adjustment procedure of bobbin thread detection (Perform this adjustment when replacing the microcomputer circuit board.) How to adjust Adjustment drawing (Caution) Be sure to turn OFF the power to the sewing machine up to steps 1 through 2. Microcomputer circuit board 1) Draw out the connectors of CN18 and CN32 mounted on the microcomputer circuit board.
  • Page 39 (27) Adjusting the DF detecting switch How to adjust Location of components to be adjusted Loosen two screws and determine the position of the DF sensor circuit board (asm.) so that DF (drop feed) switch is turned ON with the DF link when the DF knob moves to the right [feed dog DOWN].
  • Page 40 (29) Adjusting the main shaft support How to adjust Adjustment drawing Press main shaft support 1 in the direction of P as shown in the illustration and fix it. At this time, press main shaft 2 to such an extent that it bends upward by 0.05 mm. (30) Adjusting the position of the driving gear cover How to adjust Adjustment drawing...
  • Page 41 (31) Adjusting the needle thread breakage detection circuit board (31) -1 Measurement of sensor output How to adjust Adjustment drawing Measure the voltage between ground and CN16-3 pin. CN16-3 (+) Ground Tester (31) -2 Relation between shielding and sensor output How to adjust Adjustment drawing Shielding plate OPEN →...
  • Page 42 2. Embroidering device Embroidering device Y-STM (asm.) Y drive plate Cord presser 1 Replacing procedure of the motor (STM) X drive plate (asm.) X pulley (asm.) Frame holder (asm.) 1 Remove the side cover. (See page 17 F. Two screws) 2 Remove the top cover.
  • Page 43 2 Adjusting the belt When the STM or the like has been replaced, it is necessary to adjust the belt tension. Perform the adjustment as shown in the figure below. 1 Remove the belt holder. (One screw) 2 For the proper belt tension, adjust the respective pulleys (asm.) so as to obtain the deflection described in the table below when a load of 0.98 N (100 g) is applied to the midway of the belt, and tighten screws (two screws).
  • Page 44 5 Connection block diagram 4 Adjusting the respective switches 1) Adjusting the mode change-over switch Adjust the position of the Embroidering device mode change-over switch so Mode change-over switch (asm.) Clearance that the clearance provided should be “0”. between the actuator of the mode change-over switch Actuator and the main body of the...

  • Page 45: Service Mode

    3. Service mode There is “service mode” (check item) on the LCD display of E9010. Confirmation and adjustment can be performed. (1) Item and description of the service mode Item Symbol on service mode setting screen Description Actual feed compensation Straight line is sewn by 50 stitches with feed 2.3 mm and actual feed is adjusted to internal signal.
  • Page 46 (2) How to make the adjustment screen appear and how to complete the procedure (2) -1 Positioning the panel switch 1. From the state that the power to the machine is turned OFF, pressing start/stop switch, reverse <Service mode screen> stitching switch and thread trimming switch, turn ON the power switch.
  • Page 47 Actual feed compensation 1. Sewing conditions • Speed : VR : max. high speed • Material : 2-ply of ELNA designated cloth • Thread : Mettler No100 for both needle and bobbin threads • Presser foot : Zigzag hinging presser foot 2.
  • Page 48 Symbol Item Procedure Caution Needle position (left) 1. Press “O” key and “Turn hand wheel until “peep” sounds” is displayed. 2. When hand wheel is turned by hand and exceeds 287˚, “peep” sounds and needle shifts to the left stitch base line.
  • Page 49 Symbol Item Procedure Caution Confirmation of card switch 1. Press “X” and the display as shown in the figure on the right will appear. 2. Card with/without check “0” is displayed if card is inserted and “1” is displayed if it is not inserted. 3.
  • Page 50 Test mode Remove front panel and easy test can be performed by the operations below in the state that connector of switch jig for test is connected toCN1 mounted on the microcomputer circuit board. 1. From the state that the power to the machine is turned OFF, shortcircuit the 1-2 pins of CN13 connector of the microcomputer circuit board and turn ON the power to the machine.
  • Page 51 [6] Circuit board connection diagram CN20 CN24 CN19 CN36 [Microcomputer circuit board] CN18 CN26 CN25 CN16 CN30 CN31 CN32 CN33 CN34 • Be to turn the power OFF when inserting / drawing out the connector of [CN14]. CN35 CN29 CN13 CN21 •...
  • Page 52 [Mocrocomputer circuit AC13.5V board block diagram] CN50 AC120V CN101 CN61 CN64 AC230V CN102 +24V,+28V CN66 CN67 CN65 CN51 CN62 CN63 AC28V,AC24V, AC12V CN24 CN14 CN22 CN27 CN28 CN35 CN30 CN29 CN12 CN16 Microcomputer circuit board CN21 CN25 CN26 CN11 CN75 CN71 CN13 CN31...
  • Page 53 Location of disassembly Locstion of disassembly [Power circuit board] A to F on pages 15 and 16 A to F on paged 15 and 16 CN63 CN62 Replacing the power circuit board Replacing procedure of the fuse CN61 Be sure to remove the power plug before starting to C) Remove the belt cover.
  • Page 54 [Filter circuit board] [Transformer] Replacing procedure of F1 fuse Replacing the transformer G) D r a w o u t t h e r e l a t e d I) D r a w o u t t h e r e l a t e d connectors after performing connectors after performing the work of disassembling...
  • Page 55 [Display circuit board] (To the microcomputer circuit board) [Switch circuit board and slide VR (variable resistor) circuit board] (To CN1 on the microcomputer circuit board) Wire color Point of end Remarks BROWN CN1-1 ORANGE CN1-2 SLED1 BLACK CN1-3 YELLOW CN1-4 SLED2 WHITE CN1-5...
  • Page 56 Copyright C 2004 ELNA All Rights Reserved Throughout the World Part No. 293-66606 041001 Printed in JAPAN...

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