JUKI HZL-F series, Service Manual

Page 1: ...SERVICE Manual HZL F Series COMPUTER SEWING MACHINE ...

Page 2: ......

Page 3: ... 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 5 19 Lon...

Page 4: ...mming switch Press heel side of foot controller Safety control When the motor shaft of the sewing machine is accidentally constrained the power supply to the motor is stopped within two seconds When the motor is overheated the built in thermal switch stops the power to the motor Note that the machine can be restarted once the motor spontaneously cools down 5 Stop position Upon finishing sewing the...

Page 5: ... stitch Three stitches are sewn in normal direction and three stitches are sewn in reverse direction at the beginning and end the reverse switch is turned ON of sewing Amount of feed Same with the preset amount of feed Other patterns Zero feed is inserted and one each stitch is sewn in the normal and reverse directions at the beginning and end the reverse switch is turned ON of sewing Amount of fe...

Page 6: ... Needle Presser foot Sensor pinhole for buttonholing Presser foot releasing button Feed dog Throat plate Hook cover Bobbin winding shaft Hook cover release button Presser foot holder setscrew Presser foot holder Thread trimming button Thread cutter Reverse stitch button Speed controller Needle up down button Presser foot pressure adjustment dial Thread tension adjustment dial Pattern adjustment di...

Page 7: ...f the right side of the cover Remove setscrews 1 and 2 from the cover Then remove the cover Remove setscrews 3 and 4 from the throat plate Then remove the throat plate 3 Disassembling the machine covers 1 Top cover 2 Face cover 3 Throat plate 1 2 3 4 ...

Page 8: ...computer PCB Loosen the setscrew of the grounding wire Remove the grounding wire Remove the spool cover from the main unit of the machine paying attention to the base tension Remove setscrews 1 and 2 from the bottom cover of the free arm Remove the bottom cover 4 Spool cover 5 Bottom cover of the free arm 1 2 6 7 8 9 0 5 Microcomputer PCB Setscrew of the grounding wire Base tension ...

Page 9: ...er cushion of the bed cover Remove setscrew 6 from the bed cover Remove setscrews 7 and 8 from the metal plate Remove the bed cover Remove setscrew 9 from the upper cover of the free arm Remove the cover Remove setscrews 0 and 1 from the face plate cover Remove the face plate cover 9 3 4 5 6 7 8 0 1 ...

Page 10: ...front panel in the direction of the arrow tap Z section with your hand to remove hook B located at the bed surface Lastly remove hook C located at the lower side of the machine jaw Remove connectors for SUMI card start switch and LED lamp from the microcomputer PCB when necessary 3 2 Notch A B C Z Open 4 5 6 10 Rear panel Remove setscrews 4 5 and 6 from the rear panel Remove the rear panel with th...

Page 11: ...D CN7 FOR FACTORY 2 4PIN GND CN8 RESERVE 1PIN 5V 3PIN GND CN9 CONTROLLER_SOCKET 1PIN GND FG CN10 POWER_SUPPLY_RELAY_LEAD_WIRE 1 2PIN 29V 4 5PIN GND FG CN11 MAIN MOTOR CN12 THREAD_TRIMMING_STM 1 2PIN 3 4PIN 8 5Ω CN13 FEED_STM 1 2PIN 3 4PIN 4 0Ω CN14 NEEDLE_THROW_STM 1 2PIN 3 4PIN 5 0Ω CN15 THREAD_TRIMMING_STM_ORIGINAL _POINT_CIRCUIT_BOARD 3PIN GND CN16 SW SLIDE_VOLUME_CIRCUIT_BOARD 7PIN 5V 9PIN GND...

Page 12: ...nation Check CN1 POWER SW AC input CN2 POWER_SUPPLY_RELAY_LEAD_WIRE 1 2PIN 29V 4 5PIN GND FG マイコン基板 CN19に接続 マイコン基板 CN19に接続 HZL F600 HZL F400 F300 To be connected to CN19 of microcomputer PCB To be connected to CN19 of microcomputer PCB CN2 CN1 ...

Page 13: ...e needle does not slip off from the connecting stud 5 Place the metal plate on the throat plate Move the needle bar up and down by hand to adjust so that the cut surface of the gauge needle aligns with the top surface of the metal plate Then turn the needle bar by two degrees of an angle as illustrated in the sketch below 6 Temporarily tighten needle bar connecting stud setscrew 1 and reconfirm th...

Page 14: ... it reaches the top face of the throat plate by turning the hand wheel 5 3 Feed dog height Do not remove the throat plate Adjustment procedure 1 Set the amount of feed to 0 zero 2 Turn the hand wheel to bring the feed dog to its highest dead point 3 Turn left side shaft a and right side shaft b with a 2mm hexagonal wrench 4 Adjust the feed dog height so that the front and rear ends of the feed dog...

Page 15: ...rew No 2 is located just underside of the hook driving shaft pulley 5 5 Feed timing After checking the feed dog height and the needle bar height carry out adjustment of the feed timing Adjustment procedure 1 Assemble a HA x 1 needle 14 into the needle bar 2 Loosen setscrew No 2 in the hook driving shaft pulley 3 Loosen setscrew No 1 in the hook driving shaft pulley Adjust the pulley so that the lo...

Page 16: ... right needle position Move the hook driving gear in the rotational direction to adjust distance D of 3 1 to 3 3 mm is provided between the tip of blade point of the hook and the upper end of the needle eye when the needle bar is lifted by 1 6 mm from the lowest dead point by turning the hand wheel by hand At this time the backlash between the hook driving gear and the gear on the hook side may ch...

Page 17: ...dle entry point shift 4 to the right If the clearance is larger at the left needle entry point shift 4 to the left P section 4 3 Adjustment procedure 1 Select No 2 FAGOTT of the service mode 2 Gradually turn adjusting shaft 2 to find a position where the needle deviates slightly Now temporarily tighten screw 1 3 Slightly loosen setscrew 3 Adjust the lateral balance of the needle bar by slightly mo...

Page 18: ...race surface and the bobbin case holder may be stained with dirt oil or grease Wipe them off with an alcohol soaked cloth where necessary If those parts are left stained chattering or thread slip off noise of the bobbin case holder can occur 5 9 Adjusting the bobbin thread tension Remove the throat plate Adjustment procedure 1 Position the bobbin case holder and a tension gauge as illustrated in t...

Page 19: ...the opening arm aligns with the marker dot on the thread releasing arm 5 10 2 Pretension disk opening amount Remove the face cover thread tension cover and the spool cover Adjustment procedure 1 Raise the presser foot lifting lever 2 Adjust the pretension disk float adjusting screw so that the opening amount of the pretension disk becomes approximately 1 mm Note that the tension of the pretension ...

Page 20: ...ension opening amount Remove the face cover the thread tension cover and the spool cover Adjustment procedure 1 Raise the presser foot lifting lever 2 Adjust the base tension opening amount to 1 mm by turning the base tension adjusting screw Disk A Disk B 1 mm 1 mm Base tension adjusting screw Pretension disk Thread tension disk float adjusting screw Pretension disk float adjusting screw Tension d...

Page 21: ...er adjustment of the opening amounts of each tension control part lower the presser foot lifting lever or return the thread tension releasing link plate to its home position to make sure that those tension control parts are closed 5 11 Adjusting the needle thread tension Remove the thread tension controller cover Adjustment procedure 1 Raise the presser foot lifting lever 2 Turn the thread tension...

Page 22: ...d 4 Fit a hexagonal wrench on the needle bar guide setscrew to loosen it slightly If the needle threading hook position is too low Move the needle bar guide upward and temporarily tighten the setscrew If the needle threading hook position is too high Move the needle bar guide downward and temporarily tighten the setscrew Adjust the needle threading hook carefully checking its position with respect...

Page 23: ...ut so that the distance shown in the enlarged partial view is obtained 2 Tighten the locknut to fix the adjusting nut Caution If the thread does not enter the guide slit of the needle threading hook when threading the needle check the distance and adjust it correctly Adjusting nut Locknut Enlarged partial view Guide slit 6 7 0 1 mm ...

Page 24: ...e adjusting screw The amount and timing of opening can be adjusted 5 15 Adjusting the presser foot lifting switch Remove the face cover the thread tension cover and the spool cover Adjustment procedure 1 Loosen the adjusting screw of the presser foot lifting switch Adjust the position of the presser foot lifting switch so that the sewing machine stops when the presser foot lever is raised by 5 mm ...

Page 25: ...parallel to the feed dog groove and so that the needle hole in the throat plate is nearly aligned with the slot in the standard presser foot 5 17 Motor belt Remove the front panel Adjustment procedure 1 Set the motor timing belt to the motor pulley and the motor shaft pulley 2 Adjust the motor bracket so that the belt deflection amount becomes 6 1 mm when pressing the center of the belt with a for...

Page 26: ...assemble the parts Refer to the Caution below Caution When assembling the thread trimmer grasping unit put its pin into the slit in the thread trimmer link at the lower side of the mechanism section as illustrated below Setscrew of the thread trimming blade cover Thread trimming blade cover Thread trimmer grasping unit Thread trimming blade Thread trimming cannot be performed if the pin has not en...

Page 27: ...ears 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 Turn the pattern adjustment dial to adjust so that the bottom end of the left row seam and that of the right row seam of the third pattern lie on a straight line as illustrated in the sketch to...

Page 28: ... DARNING Select the darning pattern Darning pattern can be sewn with the initial value 4 ZIG ZAG Select the zigzag pattern Zigzag pattern can be sewn with the initial value 5 KIKKOU Select the Kikkou pattern Kikkou pattern can be sewn with the initial value 6 OVERCASTING Adjust the needle entry point for overcasting Slide the needle entry points toward the needle throwing direction entirely by the...

Page 29: ...h the feed amount determined by the adjusted number of pulses 16 BH UPPER LIMIT The upper limit of the scaling factor employed at the feedback operation the operation for sewing the buttonhole of the same size again is adjusted The upper limit of the scaling factor employed at feedback operation can be changed with the feed amount adjusting dial or button The adjustable range of scaling factor is ...

Page 30: ......

Page 31: ......

Page 32: ...2 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 ...