JUKI HZL-F series Service Manual
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JUKI HZL-F series Service Manual

JUKI HZL-F series Service Manual

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COMPuTER SEWInG MaCHInE
HZl-F Series
SERVICE Manual

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Summary of Contents for JUKI HZL-F series

  • Page 1 COMPuTER SEWInG MaCHInE HZl-F Series SERVICE Manual...

  • Page 3: Table Of Contents

    COnTEnTS [ 1] Specifications of HZL-F Series ............. 1 [ 2] Principal parts ..................3 [ 3] Disassembling the machine covers ............. 4 [ 4] PCB connection diagram ..............8 [ 5] Adjustment ................... 10 5-1 Adjusting the needle bar height ..............10 5-2 Adjusting the needle entry point ..............11 5-3 Feed dog height ....................11 5-4 Timing belt ......................12 5-5 Feed timing ....................... 12 5-6 Timing between the needle and the hook ............13 5-7 Clearance between the needle and the blade point of hook ......14 5-8 Position of the hook rotation stopper plate ............ 15 5-9 Adjusting the bobbin thread tension .............. 15 5-10 Adjusting the disk opening amount .............. 16 　　5-10-1 Adjusting the tension release adjusting plate ........16 　　5-10-2 Pretension disk opening amount ............16 　　5-10-3 Tension disk opening amount ............17 　　5-10-4 Base tension opening amount ............17 　　5-10-5 Adjusting the disk opening amount at the time of thread trimming . 18 5-11 Adjusting the needle thread tension ............. 18 5-12 Vertical position of the needle threading hook ..........19 5-13 Adjusting the auxiliary hook height .............. 20 5-14 Adjusting the opening amount of auxiliary hook ......... 21 5-15 Adjusting the presser foot lifting switch ............21 5-16 Adjusting the presser bar height ..............22 5-17 Motor belt ......................22 5-18 Automatic thread trimming ................23...

  • Page 4: 1] Specifications Of Hzl-F Series

    [1] Specifications of HZL-F Series (1) Power switch ･ 220-240V AC common to 50/60 Hz ･ 20V AC common to 60 Hz (2) Power consumption ･ 65 W (3) Dimensions and weight ･ Dimensions Main unit: 445 (width) x 20 (depth) x 290.5 (height) (mm) Case set: 50 (width) x 257 (depth) x 305 (height) (mm) ･...
  • Page 5 (7) Amount of feed ･ The amount of feed is changed in increments of 0.2 mm by the stitch length adjusting dial. (For the parallel parts of a buttonhole and satin stitches, the amount feed is changed in increments of 0. mm.) Default setting: 2.4 mm (for straight stitching) (8) Pattern selection ･...

  • Page 6: 2] Principal Parts

    [2] Principal parts Thread tension adjustment dial Spool cap (large) Speed controller Presser foot pressure adjustment dial Spool pin Face plate cover Bobbin winding shaft Threading lever Needle up/down button LCD Screen Presser foot lifting lever Light under arm Sensor pinhole for buttonholing F600 Only Thread cutter Reverse stitch...

  • Page 7: 3] Disassembling The Machine Covers

    [3] Disassembling the machine covers 1) Top cover ○ To remove the top cover, bow the hinge section of the right side of the cover. 2) Face cover ○ Remove setscrews from the cover. Then, remove the cover. 3) Throat plate ○...
  • Page 8 4) Spool cover ○ Remove setscrew from the thread tension cover. Remove the thread tension cover. ○ Remove setscrews from the spool cover. ○ Pull out the cable of bobbin winder motor from the microcomputer PCB. Loosen the setscrew of the grounding wire. Remove the grounding wire. ○...
  • Page 9 6) Bed cover ○ Remove setscrews from the rubber cushion of the bed cover. Remove setscrew from the bed cover. Remove setscrews from the metal plate. Remove the bed cover. 7) Upper cover of the free ○ Remove setscrew from the upper cover of the free arm. Remove the cover.
  • Page 10 9) Front panel ○ Pull out the pattern adjustment dial. ○ Remove setscrews from the front panel. ○ Put a thin screwdriver in the notch in the rising section under the arm and pry off the front panel and hook of the rear panel.

  • Page 11: 4] Pcb Connection Diagram

    [4] PCB connection diagram ・ Microcomputer PCB CN10 Connector Destination Check ON_HAND_LED_CIRCUIT_BOARD_2 PIN 5V BOBBIN_WINDING_MOTOR 2PIN GND, 3PIN 29V OST SW 2PIN GND BH_RELAY_LEAD_WIRE PIN GND(FG), 4PIN 5V MAIN_SHAFT_DETECTION_CIRCUIT_BOARD PIN 5V, 6PIN GND FLASH MEMORY INTERFACE PIN 3.3V, 6PIN GND FOR FACTORY 2,4PIN GND RESERVE...
  • Page 12 ・ Display PCB HZL-F600 HZL-F400 / F300 To be connected to CN19 To be connected to CN19 マイコン基板 CN19に接続 マイコン基板 CN19に接続 of microcomputer PCB of microcomputer PCB ・ Power PCB Connector No. Destination Check POWER SW AC input POWER_SUPPLY_RELAY_LEAD_WIRE -2PIN 29V, 4-5PIN GND(FG) –...

  • Page 13: 5] Adjustment

    [5] Adjustment 5-1 Adjusting the needle bar height ○ Remove the face cover. Adjustment value: ・ Distance from the bottom end of the pin inside needle bar surface to the top surface of the throat plate: 9 mm ・ When the needle is mounted, the needle eye tilts rightward by 2 degrees. Adjustment procedure .

  • Page 14: Adjusting The Needle Entry Point

    5-2 Adjusting the needle entry point ○ Remove the face cover. Adjustment procedure . Select the straight stitch using the pattern selecting button. Choose center needle position. 2. Assemble a needle #4 into the needle bar, loosen the setscrew in the eccentric collar and adjust the feed bar eccentric collar so that the needle meets the center of the needle slot in the throat plate when it reaches the top face of the throat plate by turning the hand wheel.

  • Page 15: Timing Belt

    5-4 Timing belt ○ Remove the front panel and the microcomputer PCB. Adjustment procedure . Loosen the setscrew in the idler mounting base and loosen the timing belt. 2. Turn the hand wheel to bring the needle bar to its lowest dead point. 3.

  • Page 16: Timing Between The Needle And The Hook

    5-6 Timing between the needle and the hook ○ Remove the throat plate, the bed cover and the bottom cover of the free arm. Method for checking . Check to be sure that the needle entry point and needle bar height are correct. 2.

  • Page 17: Clearance Between The Needle And The Blade Point Of Hook

    5-7 Clearance between the needle and the blade point of hook ○ Remove the face cover and the throat plate. Adjustment procedure . Loosen screw . Adjust the clearance between the needle and the blade point of the hook to 0.02 to 0.07 mm by turning adjusting shaft 0.02 to 0.07 mm Adjusting the balance of the clearances at the right and left needle entry points...

  • Page 18: Position Of The Hook Rotation Stopper Plate

    5-8 Position of the hook rotation stopper plate ○ Remove the throat plate. Adjustment procedure . When the bobbin case holder is placed inside the rotating hook, loosen the setscrew and determine the longitudinal position of the rotation stopper plate so that the projection of the bobbin case holder and the leaf spring of the rotation stopper plate are located as illustrated in the enlarged partial view.

  • Page 19: Adjusting The Disk Opening Amount

    5-10 Adjusting the disk opening amount 5-10-1 Adjusting the thread tension release adjusting plate ○ Remove the face cover, the thread tension cover and the spool cover. Adjustment procedure . Raise the presser foot lifting lever. 2. Loosen the adjusting screw and adjust the thread tension release adjusting plate so that the top end of claw of the opening arm aligns with the marker dot on the thread releasing arm.

  • Page 20: Tension Disk Opening Amount

    5-10-3 Tension disk opening amount ○ Remove the face cover, thread tension cover and the spool cover. Adjustment procedure 1. Maximize the tension with the thread tension adjustment dial. Raise the presser foot lifting lever. 2. Adjust the clearance between tension disks (A) and (B) to 1 mm by turning the thread tension float adjusting screw.

  • Page 21: Adjusting The Disk Opening Amount At The Time Of Thread Trimming

    5-10-5 Adjusting the disk opening amount at the time of thread trimming Adjustment procedure . Lower the presser foot lifting lever. 2. Select No. 9 SARA UKASHI (meaning: tension release) of the service mode. 3. Loosen the locknut. Turn the adjusting nut to adjust the retracting amount of the thread tension releasing link plate so that the top end of claw of the opening arm is aligned with the marker dot on the thread tension releasing arm.

  • Page 22: Vertical Position Of The Needle Threading Hook

    5-12 Vertical position of the needle threading hook ○ Remove the frame cover. Adjustment procedure . Assemble a household HA x  needle # into the needle bar. 2. Turn the hand wheel to bring the needle bar near its highest dead point and stop the hand wheel when the needle bar reaches the location where the setscrew in the needle bar guide is visible.

  • Page 23: Adjusting The Auxiliary Hook Height

    5-13 Adjusting the auxiliary hook height ○ Remove the face cover. Adjustment procedure . Loosen the locknut. Adjust the adjusting nut so that the distance shown in the enlarged partial view is obtained. 2. Tighten the locknut to fix the adjusting nut. Adjusting Locknut Enlarged partial view...

  • Page 24: Adjusting The Opening Amount Of Auxiliary Hook

    5-14 Adjusting the opening amount of auxiliary hook Adjustment procedure 1. Adjust the adjusting screw to the distance shown in the enlarged partial view. 6 ± 0.2 mm Adjusting screw Enlarged partial view Auxiliary hook Caution: If the auxiliary hook still keeps the thread after completion of needle threading, or if the auxiliary hook releases the thread before the needle threading hook catches the thread, adjust the adjusting screw.

  • Page 25: Adjusting The Presser Bar Height

    5-16 Adjusting the presser bar height ○ Remove the frame cover. Adjustment procedure . Assemble the standard presser foot in the presser foot holder. Raise the presser foot lifting lever. 2. Loosen the setscrew of the presser bar position bracket. Adjust the distance from the top surface of the throat plate to the bottom face of the standard presser foot to 6±0.3 mm.

  • Page 26: Automatic Thread Trimming

    5-18 Automatic thread trimming Changing the thread trimming knife . Remove the throat plate. 2. Remove the setscrew of the thread trimming knife cover. Remove the thread trimming knife cover, the thread trimmer grasping unit and the thread trimming knife. 3.

  • Page 27: Longitudinal Feed

    5-19 Longitudinal feed Preparation for adjustment Turn OFF the power switch. Keep pressing both the reverse stitch button and thread trimming button simultaneously and turn ON the power switch. The service mode screen appears on the display. Select "No. 3" to change over the screen to the sewing pattern for adjusting darning. Adjustment procedure Sew a darning sewing pattern three times under the aforementioned sewing conditions.

  • Page 28: Service Mode

    5-20 Service mode 5-20-1 Service mode screen HZL-F600, HZL-F400, HZL-F300 … Check with item numbers and items. [How to select the service mode] . When the power switch stays off, keep pressing both the reverse feed button and the thread trimming button simultaneously to turn ON the power switch.
  • Page 29 Item name Description SARA UKASHI Bring the disks to the floating condition. (Tension release) Operate the "OK" switch, and the disks will float. The maximum sewing speed is 500 sti/min (SPM) when the straight STRAIGHT 500STI/MIN stitch pattern is selected. Indications on the LCD can be checked.
  • Page 32 HOUSEHOLD SEWING MACHINE DIVISION 8-2-1. KOKURYO-CHO, CHOFU-SHI, TOKYO 182-8655, JAPAN PHOnE : (81)3-3480-2458 FaX : (81)3-3480-5037 Copyright C 2009 JUKI CORPORATION. All rights reserved throughout the world. 40083766 2009/02...

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