JUKI HZL-G Series Service Manual Download | Manualshive

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SERVICE Manual

HZl-G Series

COMPuTER SEWInG MaCHInE

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Summary of Contents for HZL-G Series

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

Page 2: ...e top face of the throat plate by turning the hand wheel 6 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 Using a tapered head slotted screwdriver turn shaft a on the left side and shaft b on the right side 4 Adjust the feed dog height so that the front and rear ends of...

Page 3: ...ming HZL G210 21 6 11 Adjusting the needle thread tension 21 6 12 Vertical position of the needle threading hook 22 6 13 Adjusting the presser foot lifting switch 23 6 14 Adjusting the presser bar height 23 6 15 Motor belt 24 6 16 Automatic thread trimming HZL G210 25 6 16 1 Lateral position of the thread trimming mechanism base 25 6 16 2 Phase of the catching unit driving cam 26 6 16 3 Replacing ...

Page 4: ...hread trimming 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 s...

Page 5: ...hreading lever and automatically returns to its original position after completion of threading 11 Automatic lock stitch When the backtacking switch is turned ON Straight 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 patte...

Page 6: ...ation stopper plate Hitch stitch 6 2 Adjusting the needle entry point Faulty material feed 6 3 Feed dog height 6 14 Adjusting the presser bar height Contact between needle and throat plate or hook 6 2 Adjusting the needle entry point 6 5 Feed timing 6 6 Timing between the needle and the hook Faulty pattern shape 6 3 Feed dog height 6 17 Longitudinal feed Faulty automatic thread trimming 6 10 4 Adj...

Page 7: ...y case Presser foot lifting lever Drop feed knob Needle setscrew Needle Presser foot Presser foot releasing button Feed dog Throat plate Hook cover Bobbin winding shaft Hook cover release button Presser foot holder setscrew Thread trimming button Thread cutter Reverse stitch button Speed controller Needle up down button Thread tension adjustment dial Buttonholing lever Threading lever Presser foot...

Page 8: ...on of the right side of the cover Remove setscrews 1 from the cover Then remove the cover Remove setscrews 2 and 3 from the throat plate Then remove the throat plate 4 Disassembling the machine covers 1 Top cover 2 Face cover 3 Throat plate 1 2 3 ...

Page 9: ...ocomputer 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 9 and 0 from the bottom cover of the free arm Remove the bottom cover 4 Spool cover 5 Bottom cover of the free arm Microcomputer PCB Setscrew of the grounding wire Base tension 5 6 7 8 4 9 0 ...

Page 10: ...er cushion of the bed cover Remove setscrew 4 from the bed cover Remove setscrews 5 and 6 from the metal plate Remove the bed cover Remove setscrew 7 from the upper cover of the free arm Remove the cover Remove setscrews 8 and 9 from the face plate cover Remove the face plate cover 7 1 2 3 4 5 6 8 9 ...

Page 11: ...anel 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 10 Rear panel Remove setscrews 2 3 and 4 from the rear panel Remove the rear panel with the presser foot lifting lever raised ...

Page 12: ...nder switch 2 GND 3 Bobbin winder motor 29V 4 Bobbin winder motor CN3 OST SW 1 Presser foot lifting switch 2 GND CN4 BH_SW 1 GND 2 BHR SW 3 BHS SW 4 5V CN5 MAIN_SHAFT_DETECTION_CIRCUIT_BOARD 1 5V 2 Motor pulse 3 S1 4 S2 5 S3 6 GND CN6 FLASH MEMORY INTERFACE 1 5V 6 GND CN7 FOR FACTORY 2 GND 4 GND CN8 RESERVE Not installed 1 5V 3 GND CN9 CONTROLLER_SOCKET 1 GND 2 CONTROLLER ...

Page 13: ...CIRCUIT_BOARD 1 2 Detection signal 3 GND CN16 SW SLIDE_VOLUME_CIRCUIT_BOARD 1 LED G 2 LED R 3 Thread trimming needle up down switch 4 Reverse stitch switch 5 S S switch 6 7 5V 8 Speed control variable resistor 9 GND CN17 UNDER_ARM_LED_CIRCUIT_BOARD Not installed CN18 ON_HAND_LED_CIRCUIT_BOARD_1 1 5V 2 CN19 PANEL_CIRCUIT_BOARD 1 3 NC 4 7 Switch strobe 8 9 5V 10 11 GND 12 LCD signal 13 14 3 3V PU 15...

Page 14: ... 11 Display PCB Power PCB Connector No Destination Check CN1 POWER SW AC input CN2 POWER_SUPPLY_RELAY_LEAD_WIRE 1 2PIN 29V 4 5PIN GND FG To be connected to CN19 of microcomputer PCB CN2 CN1 ...

Page 15: ... 12 Connection block diagram ...

Page 16: ...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 17: ...rew No 2 is located just underside of the hook driving shaft pulley 6 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 18: ... 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 19: ...le 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 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 moving rig...

Page 20: ...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 6 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 21: ...w of the opening arm aligns with the marker dot on the thread releasing arm Thread tension release adjusting plate Thread releasing arm Opening arm Align with the marker dot Adjusting screw 6 10 2 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 lifti...

Page 22: ...foot lifting lever 2 Adjust the base tension opening amount to 1 mm by turning the base tension adjusting screw 1 mm Base tension adjusting screw Thread tension disk float adjusting screw Tension disk float adjusting screw The pretension disk float adjusting screw and the tension disk float adjusting screw can be turned without loosening the nuts ...

Page 23: ...ustment 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 6 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 adjus...

Page 24: ...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 25: ...usting the presser bar height Remove the frame cover Adjustment procedure 1 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 At this time check the direction of the presse...

Page 26: ...ulley 2 Adjust the motor bracket so that the belt deflection amount becomes 6 1 mm when pressing the center of the belt with a force of 0 98 N After completion of adjustment tighten the setscrew in the motor bracket Motor pulley Motor shaft pulley Motor bracket Setscrew of the motor bracket Setscrew of the motor bracket 0 98 N 6 1 mm ...

Page 27: ...ivate the thread trimming mechanism 4 In the aforementioned state loosen two adjusting screws and move the thread trimming mechanism base laterally with pressed in P direction until the rear end of the catching unit is aligned with the marker line Then tighten the adjusting screws Adjusting screw Thread trimming mechanism base Catching unit Align the rear end of the catching unit with the marker l...

Page 28: ... contact with the pin See Fig C 4 In the aforementioned state securely tighten setscrew 1 while removing a thrust play between the cam driving shaft and the cam driving gear right as shown Fig D 5 The aforementioned step connects the shaft and the gear Then turn the intermediate gear so that setscrew 2 is brought to the front side Then securely tighten setscrew 2 Cam driving shaft Setscrew 1 Turn ...

Page 29: ...edure 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 ...

Page 30: ...ust the third pattern as shown Fig A by means of the feed adjusting button so that the lower end of the inner left line and the lower end of the right line of the replicating part of the pattern lie on the same line reference error 0 1 mm Refer to Fig B for the direction of the adjustment Fig A Fig B Lengthwise feed adjustment value Feed adjusting button Direction of adjustment of lengthwise feed ...

Page 31: ...e buttonholing foot In this state loosen the screws and adjust the buttonholing switch so that its standby side contact point is placed at the center of the range of movement of the lever The stitches at the beginning of sewing must be hidden under the bartacking part and circular part The side stitches at the end of sewing must not overrun from the bartacks or the former must not be spaced from t...

Page 32: ...feed to zero 0 2 FAGOTT Select the fagoting pattern Set the zigzag width at 7 0 mm The fagoting pattern can be sewn 3 DARNING Select the darning pattern and adjust the lengthwise feed 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 ...

Page 33: ...determined by the number of pulses The straight stitch is selected as the sewing pattern The number of pulses of feed can be adjusted using the feed amount adjusting button The straight stitch pattern can be sewn with the feed amount determined by the adjusted number of pulses 15 FEED PULSE TEST2 Zigzag stitch can be sewn with the amount of feed determined by the number of pulses The zigzag stitch...

Page 34: ...ight C 2011 JUKI CORPORATION All rights reserved throughout the world 40113428 SEWING MACHINERY BUSINESS UNIT 2 11 1 TSURUMAKI TAMA SHI TOKYO 206 8551 JAPAN PHONE 81 42 357 2371 FAX 81 42 357 2380 http www juki com ...

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