JUKI SC-920 Engineer's Manual
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JUKI SC-920 Engineer's Manual

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SC-920
ENGINEER'S MANUAL
40089311
No.E393-00

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Summary of Contents for JUKI SC-920

  • Page 1 ® SC-920 ENGINEER’S MANUAL 40089311 No.E393-00...
  • Page 2 The Instruction Manual for these machines intended for the maintenance personnel and operators at an apparel factory contains operating instructions in detail. It is advisable to use the Instruction Manual and Parts List for CP-180, IP-110F, SC-920 together with this Engineer's Manual when carrying out the maintenance of these machines.

  • Page 3: Table Of Contents

    (9) Adjusting the machine head (Direct-drive motor type sewing machine only) ..39 (10) Function setting list ....................40 (11) Detailed explanation of selection of functions ............44 6. CONNECTING PROCEDURE OF JUKI OPTIONAL DEVICE ......54 (1) Connection of the material end sensor (ED) ............54 (2) Connection of the pedal of standing-work machine (PK) ........54...
  • Page 4 (1) Replacing the fuse ......................60 (2) Method of voltage changeover ..................61 12. REGARDING ERROR DISPLAY (SC-920) ............62 (1) Error code list (SC-920) ....................64 13. BLOCK DIAGRAM ....................66 (1) SC-920 block diagram ....................66 (2) IP-110F operation panel block diagram ..............67 14.

  • Page 5: Specification

    4) By using the flash ROM for CPU, the future version-up can be adapted. 5) The SC-920 control box can be used for the (belt) drive system machine head by connecting the DD (direct-drive) system machine head and the small-sized motor unit (M-92).

  • Page 6: Name Of Each Component

    Operation panel (CP-18, 180 or IP-110F) Oil filler port (except for DDL-9000B-DS) Pulley cover Feed lever Thread stand Minute adjustable presser lifting screw Control box (SC-920) Hand wheel Operation pedal Take-up lever cover One-touch type reverse feed button Finger guard...
  • Page 7 This cover protects the machine head motor. Thread stand Control box (SC-920) The box contains the circuit that controls the head unit and motor, the output circuit that operates each output (the thread trimming solenoid, back solenoid, wiper solenoid, etc.), the pedal sensor that detects the pedal operation, and the power circuit that performs each function.

  • Page 8: Explanation Of Operation Panel

    4. EXPLANATION OF OPERATION PANEL (1) List of operation panels of CP-180 Power indication LED : Lights up when the power switch is turned ON. Max. speed limit variable resister : Maximum speed is limited when this resister is moved in the left direction ( Pattern selector switch : Used for selecting a pattern from among the four different patterns.

  • Page 9: List Of Operation Panel Of Ip-110F

    (2) List of operation panel of IP-110F IP-110 Re-sewing switch Information switch Power display lamp Needle up/down compensating switch Material edge sensor switch Media slot cover Screen changeover switch One-shot stitching switch Media slot With/without reverse feed stitch With/without automatic thread (Media inserting opening) c t i i r t...
  • Page 10 Teaching switch This is the switch to set the setting of the number of stitches with the value of number of stitches which has been actually sewn. Information switch This is the switch to perform various function settings. Material edge sensor Rendered effective when the material edge sensor is installed on the machine.

  • Page 11: Operation Of The Connection Panel

    (3) Operation of the connection panel 1) Connecting procedure of CP-18/180 or IP-110F [Connection of the connector for CP, IP panel] Exclusive connectors are prepared for connection of the connector for CP-18/180, IP-110F. Paying attention to the orientation of the connector, con- nect it to connector CN38 located on the circuit board.

  • Page 12: Explanation Of Operation Panel Cp-180

    (4) Explanation of operation panel CP-180 1) Reverse stitching pattern 1. Press reverse stitching pattern switch specify the reverse stitching pattern. 2. The reverse stitching pattern is selected, and the number of stitches and data on reverse stitching which have already been specified are shown on the panel.

  • Page 13: Constant-Dimension Stitching Pattern

    2) Constant-dimension stitching pattern 1. Press constant-dimension stitching pattern switch on the control panel to select the constant-dimension stitching pattern. 2. The constant-dimension stitching pattern is selected. Now, the predetermined number of stitches and the state of reverse stitching Sewing pattern function are shown on the control panel.

  • Page 14: Overlapped Stitching Pattern

    3) Overlapped stitching pattern 1. Press overlapped stitching pattern switch specify the overlapped stitching pattern. 2. The overlapped stitching pattern is selected, and the number of stitches and data on overlapped stitching which have already been specified are shown on the panel. 3.

  • Page 15: Rectangular Stitching Pattern

    4) Rectangular stitching pattern Sewing pattern 1. Press rectangular stitching pattern switch on the control panel to select the rectangular stitching pattern. 2. The rectangular stitching pattern is selected. Now, the predetermined number of stitches and other sewing data are shown on the control panel. 3.

  • Page 16: Example Of Application

    (5) Example of application 1) When the CP-180 is used together with the material end sensor (ED : optional), it can be used as a small edge-controller. (Method) Adjust the position to mark of the CP-180, turn ON material end sensor ON/OFF switch of the CP-160, and turn ON mark...
  • Page 17 2) Label attaching is performed by the automatic one-shot stitching with the CP-180 (Method) Select mark on the CP-180, and turn ON mark of the automatic one-shot stitching. (Explanation) Number of stitches at the section CD can be set up to 500 stitches. If the stitch length is 2 mm, it is possible to sew approximately 1,000 mm (1 m).
  • Page 18 Section of EBT the rotating speed at the section where the sewing machine is rotated at a low speed can be changed. Section of low speed SC-920 function setting No. 64 Time Example) Use for reference. Standard Condition Machine head of DDL-9000B-SH (for thick materials)

  • Page 19: Explanation Of Operation Panel Ip-110F

    (6) Explanation of operation panel IP-110F Reverse stitching pattern Press to display the pattern list screen. Sewing pattern 1. Press switch to select the reverse stitching pattern, and the screen is automatically changed over to the number of stitches reverse stitching setting screen to display the number of stitches which has already been set. 2.
  • Page 20 Overlapped stitching pattern Press to display the pattern list screen. 1. Press switch to select the overlapped stitching pattern, and the screen is automatically changed over to the number of stitches of overlapped stitching setting screen to display the number of stitches which has already been set.

  • Page 21: Information

    1) Information Setting and checking of various data can be performed with the information. For the information, there are the operator level and the maintenance personnel level. [Operator level] 1. Turn ON the power. 2. Press switch to display the information screen. Information screen (operator level) : Sewing management information...
  • Page 22 [Maintenance personnel level] 1) Turn ON the power. When the needle bar is not in the UP position, turn the handwheel to bring the needle bar to its UP position. 2) Press switch for approximately three seconds to display the information screen. 3) Press switches corresponding to the various functions.
  • Page 23 3. Sewing management information For the sewing management information, there are the operator level and the maintenance personnel level. [Operator level] Press switch in the information screen. (Previous page) [Maintenance personnel level] Press switch for approximately three seconds in the information screen. (Previous page) Pictograph on the left end of the sewing management information is shown in reverse video.
  • Page 24 5. Error record display Press error record display switch in the sewing management information screen (maintenance personnel level). (Refer to the previous page.) Error record screen When switch is pressed, the error record scrolls up or down. Explanation of display Record No.
  • Page 25 Operating procedure [Maintenance personnel level] Press communication mode switch for approximately three seconds in the information screen. Refer to [Information screen (Maintenance personnel level) Pictograph on the left end of the communication screen is shown in reverse video. Communication screen (Maintenance personnel level) Kind of selected data Data selection Data...
  • Page 26 Select the method to perform communication and press set key switch Reference : Communication method cannot be selected by downloading of program. Data communication source Data communication destination Set data communication source and data communication destination in the ten key screen, or "+" or "– "...
  • Page 27 Download : Downloading from the compact flash (TM) is read from the folder of "SC-920". Store the copy from other compact flash (TM) or the like in the folder of "SC-920". Create folder "SC-920" in the compact flash (TM). (It is not necessary to create the folder when it already exists.) Copy the file (extension MSP).
  • Page 28 Download : • Downloading of SC-920 program data Downloading from the compact flash (TM) is read from the folder of "PROG¥SC-920". Store the copy from other media the like in the folder of "PROG¥SC-920". Create folder "PROG" in the compact flash (TM).
  • Page 29 10. Compact flash (TM) format Perform formating of the compact flash (TM). The compact flash (TM) formated with the personal computer or the like may not be used. When using the media with IP-110F, be sure to perform formating with IP-110F. Press compact flash (TM) format switch in the information screen (maintenance personnel level) Compact flash (TM) format confirmation screen...

  • Page 30: Error Code List (Error Display In Panel)

    2) Error code list (Error display in panel) There are the following error codes in this device. These error codes interlock (or limit function) and inform the problem so that the problem is not enlarged when any problem is discovered. When you request our service, please confirm the error codes.
  • Page 31 – 27 –...
  • Page 32 – 28 –...

  • Page 33: Warning List

    3) Warning list Contents and display of warning Corrective measure Remarks A201 Replacement of oil warning • Press to close warning screen, and Refer to the relevant perform replacement of needle. Then clear screen in regard to the value in the clear screen. the maintenance •...

  • Page 34: Control Box (Sc-920)

    Following connectors are prepared on the front face of SC-920. Connect the connectors coming from the machine head to the corresponding places so as to fit the devices mounted on the machine head.

  • Page 35: Operating Procedure

    (2) Operating procedure of the sewing machine 1. Press ON button of the power switch to turn ON the power. (Caution) In case the power indication LED does not lights up even when turning ON the power switch,immediately turn OFF the power and check the voltage.

  • Page 36: Explanation Of The Operation Panel (Cp-18)

    (3) Explanation of the operation panel (CP-18) switch : Used for changing over effective/ineffective of the reverse feed stitching pattern. switch : Used for changing over effective/ineffective of the overlapped stitching pattern. switch : Used for confirming the contents of setting and for changing over effective/ineffective of the reverse feed stitching at sewing start.

  • Page 37: Operating Procedure Of The Sewing Pattern

    (4) Operating procedure of the sewing pattern (Caution) For the operation panel other than CP-18, refer to the Instruction Manual for the operation panel to be used. 1) Reverse feed stitching pattern Reverse feed stitching at sewing start and reverse feed stitching at sewing end can be separately pro- grammed.

  • Page 38: Constant-Dimension Stitching Pattern

    2) Overlapped stitching pattern Overlapped stitching pattern can be programmed. A : Number of stitches of normal stitching setting 0 to 15 stitches B : Number of stitches of reverse stitching setting 0 to 15 stitches C : Number of stitches of normal stitching setting 0 to 15 stitches D : Number of times of repetition 0 to 9 times...

  • Page 39: One-Touch Setting

    A part of function setting items can be easily changed in the normal sewing state. (Caution) For the setting of functions other than those covered in this part, refer to "5.-(6) Setting of functions of SC-920". [One-touch setting procedure] 1. Keep...

  • Page 40: Setting For Functions

    (6) Setting of functions Functions can be selected and specified. (Caution) For the function setting procedure of any operation panel other than CP-18, refer to the In- struction Manual for the operation panel to be used. 1. Tu r n O N t h e p o w e r w i t h switch held pressed.

  • Page 41: Setting Procedure Of The Machine Head

    (Caution) For the operation panel other than CP-18, refer to the Instruction Manual for the operation panel to be used for the setting procedure of the machine head. 1. Refer to "Ⅳ-(6) Setting for functions of SC-920 Instruction Manual ", and call the function setting No. 95. 2. The type of machine head can be...

  • Page 42: Machine Head List

    (8) Machine head list Number of revolutions at Max. number of Machine head Type Contents of display the time of delivery (sti/min) revolutions (sti/min) DDL-9000B MA/MS/SS dLbM 4000 5000 DDL-9000B DS dLbd 4000 4000 DDL-9000B SH dLbH 4000 4500 dLAM 4000 5000 DDL-9000A MA/MS/SS...

  • Page 43: Adjusting The Machine Head (Direct-Drive Motor Type Sewing Machine Only)

    (9) Adjusting the machine head (direct-drive motor type sewing machine only) (Caution) When the slip between the white marker dot on the handwheel and the concave of the cov- er is excessive after thread trimming, adjust the angle of the machine head by the opera- tion below.

  • Page 44: Function Setting List

    (10) Function setting list Item Description Setting range Indication of function setting Ref. page Soft start The number of stitches to be sewn at a low speed when the soft- function start function is used at the start of sewing. 0 to 9 0 : The function is not selected.
  • Page 45 Item Description Setting range Indication of function setting Ref. page 22 Needle up/down Function of the needle up/down correction switch is changed correction over. switch 0 : Needle up/down compensation   changeover 1 : One stitch compensation function 25 Thread trimming Thread trimming operation after moving the needle away from operation after its upper or lower position by turning the handwheel by hand is...
  • Page 46 Item Description Setting range Indication of function setting Ref. page 52 Compensation of Compensation of releasing the solenoid for reverse feed stitch- solenoid-off timing ing when reverse feed stitching at the start of sewing is per- – 36 to 36  ...
  • Page 47 Item Description Setting range Indication of function setting Ref. page 91 Function of prohibiting It is effective in combination with the machine head provided compensation with tension release function.   operation after turning 0 : Tension release function is ineffective. handwheel by hand 1 : Tension release function is effective.

  • Page 48: Detailed Explanation Of Selection Of Functions

    (11) Detailed explanation of selection of functions Selection of the soft-start function (Function setting No. 1) The needle thread may fail to interlace with the bobbin thread at the start of sewing when the stitching pitch (stitch length) is small or a thick needle is used. To solve such problem, this function (called “soft-start”) is used to limit the sewing speed, thereby assuring successful formation of the starting stitches.
  • Page 49 Selection of the optional input/output function (Function setting No. 12) Select function setting No. 12 with the operating procedure of function set- ting procedures 1) through 3). Select the items of "End", "in" and "ouT" with keys [When "in" is selected] The port number is displayed on indicator .
  • Page 50 Input function list Function Abbrevia- Function item Remarks code tion No function (Standard setting) Needle up / down compensat- Every time the switch is pressed, normal feed stitching ing stitching by half stitch is performed. (Same operation as that of up / down compensating stitching switch on the panel.) Back compensating stitching Reverse feed stitching is performed at low speed while...
  • Page 51 Output function list Function Abbrevia- Function item Remarks code tion No function (Standard setting) Thread trimming output Output of thread trimming signal Thread wiper output Output of thread wiper signal Thread release output Output of thread release signal Presser lifter output Output of presser lifting signal Reverse feed stitching output Output of reverse feed stitching signal...
  • Page 52 Sewing counting function (Function setting No. 14) The function counts up every time thread trimming is completed and counts the number of completion of the sewing process. 0 : off Sewing counting function is inoperative. 1 : on Sewing counting function is operative. (Every time thread trimming is performed) 2 : on External sewing counter switch input.
  • Page 53 Function of reverse feed stitching on the way (Function setting Nos. 30 to 33) Functions of the limit of number of stitches and thread trimming command can be added to the touch back switch on the sewing machine head. Function setting No. 30 Function of reverse feed stitching on the way is selected.
  • Page 54 Holding time of lifting presser foot (Function setting No. 47) Solenoid type presser foot lifter can adjust the holding time control of lifting presser foot. This function automatically lowers the presser foot when the time set with the setting No. 47 has passed after lifting the presser foot.
  • Page 55 Foot lift function after thread trimming (Function setting No. 55) This function can automatically lift the presser foot after thread trimming. This function is effective only when it is used in combination with the AK device. 0 : off Function of automatically lifting the presser foot is not provided. (Presser foot does not automatically go up after thread trimming.) 1 : on Function of automatically lifting the presser foot is provided.
  • Page 56 Function of soft-down of presser foot (with AK device only) (Function setting Nos. 70 and 49) This function can softly lower the presser foot. This function can be used when it is necessary to decrease contact noise, cloth defect, or slippage of cloth at the time of lowering the presser foot.
  • Page 57 Initial motion UP stop position move function (Function setting No. 90) Effective/ineffective of automatic return to UP stop position immediately after turning ON the power can be set. 0 : Ineffective 1 : Effective Function added to the needle up / down compensating switch (Function setting No. 93) One stitch operation can be performed only when the needle up / down compensating switch is pressed at the time of upper stop immediately after turning ON the power switch or upper stop immediately after thread trimming.

  • Page 58: Connecting Procedure Of Juki Optional Device

    6. CONNECTING PROCEDURE OF JUKI OPTIONAL DEVICE (1) Connection of the material end sensor (ED) 1. Connect the connector of material end sensor (ED) to connector (CN54 : 4P) of SC-920. 2. Tighten the cord of the material end sensor to-...

  • Page 59: External Input / Output Connector

    Rotation by pedal is prohibited while “L” signal is being inputted. DC5V, –5mA SOFT Input Rotation speed is limited to the soft-speed while “L” signal is DC5V, –5mA being inputted. SGND JUKI genuine part No. Connector : Part No. HK016510130 Pin contact : Part No. HK016540000 – 55 –...

  • Page 60: Initialization Of The Setting Data

    8. INITIALIZATION OF THE SETTING DATA All contents of function setting of SC-920 can be returned to the standard set values. 1. Turn ON the POWER switch with all of switch , switch switch held pressed. 2. "rS" is displayed on indicator with a blip to start initialization.

  • Page 61: Connector Connection Diagram

    9. CONNECTOR CONNECTION DIAGRAM (1) Solenoid for machine head DDL-9000B-DS 8 9 10 11 12 13 14 CN36 TRMD 1 2 3 4 5 6 7 TRM (Thread trimming) Approx 7.5 Ω TRM COM BT (Touch back) Approx 6.5 Ω BT COM WP (Wiper) Approx 8.5 Ω...

  • Page 62: Optional Cord

    10. OPTIONAL CORD (1) Relay cord A asm. for the standing sewing machine (Part No. M9701351AA0) Approx. 1.5m 1) Wiring diagram of variable pedal PK-70 and -71 CN39 Brown Ω VR (1k Variable resistor Orange Used by variable voltage for speed between 1 to 2V Yellow (Increasing / decreasing...
  • Page 63 2) Wiring diagram of fixing max. speed CN39 Brown Orange Variable resistor for speed Yellow S GND Green Switch for lifting presser foot Blue S GND Perple Switch for thread trimming Gray S GND White Switch for high-speed Light blue S GND Pink Switch for low-speed...

  • Page 64: Maintenance

    11. MAINTENANCE (1) Replacing the fuse (Caution) The illustration below shows the PWR-T PCB. The type of PCB differs by destination. 1. Remove all the cables which are connected to the control box. 2. Remove the connecting rod. 3. Remove the control box from the table stand.

  • Page 65: Method Of Voltage Changeover

    A. To change over the supply voltage from 200 - 240 V to 100 - 120 V Change the power cord with the JUKI genuine Wiring for the single-phase 100 V Be sure to connect the wire between 1 and 2.

  • Page 66: Regarding Error Display (Sc-920)

    12. REGARDING ERROR DISPLAY (SC-920) In case of the following, check again before you judge the case as trouble. Phenomenon Cause Corrective measure When tilting the sewing machine, When tilting the sew ing machine Tilt the sewing machine after turning...
  • Page 67 n addition, there are the following error codes in this device. These error codes interlock (or limit function) and inform the problem so that the problem is not enlarged when any problem is discovered. When you request our service, please confirm the error codes.

  • Page 68: Error Code List (Sc-920)

    (1) Error code list (SC-920) Description of error detected Cause of occurrence expected Items to be checked E000 Execution of data • When the machine head is changed. initialization (This is not • When the initialization operation is the error.)
  • Page 69 • Check whether the applied power voltage is one is inputted. higher than the rated voltage + (plus) 10% or more. • 200V has been inputted to SC-920 of 100V specifications. • Check whether 100V/200V changeover connector is improperly set.

  • Page 70: Block Diagram

    13. BLOCK DIAGRAM (1) SC-920 block diagram  – 66 –...

  • Page 71: Ip-110F Operation Panel Block Diagram

    (2) IP-110F operation panel block diagram  – 67 –...

  • Page 72: Drawing Of The Table (For Ddl-9000B)

    Depth : 10 3-ø13, Depth : 13 2-ø3.5, Depth : 10 Logo type, designated by JUKI 2-ø3.4, Depth at the rear side : 10 (Drill a hole at the time of set-up). X-X Section Rubber Installation Reference Figure Dimension Drawing in Detail (2:1) C1.5 to C2.5 (only for hinged section)
  • Page 73 MEMO – 66 –...
  • Page 74 <REFERENCE> TABLE OF DIGITAL DISPLAY Table of digital display Numeral Digital display Numeral Digital display Numeral Digital display Numeral Digital display – 67 –...
  • Page 75 ISO14001 : 2004 REG.NO.JSAE389 CM001 Juki Corporation operates an environmental management system to promote and conduct the following as the company engages in the research, development, design, sales, distribution,and maintenance of industrial sewing machines, household sewing machines, industrial robots, etc., and in the provision of sales and maintenance services...

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