Brother DB2-B705-100 Service Manual Download Page 17 | Manualshive

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From the library of: Superior Sewing Machine & Supply LLC

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Summary of Contents for DB2-B705-100

Page 1: ...SERVfCE MANUAL FOR BROTHER MODEL DB2 B705 1 00 200 400 500 BROTHER INDUSTRIES LTD NAGOYA JAPAN r From the library of Superior Sewing Machine Supply LLC ...

Page 2: ...vice manual may be helpful for your better maintenance We duly hope that you get full knowledge on this machine by this service manual as well as instruction manuals and parts catalogues Incidentally this covers the description on our newly developed BROTHER Needle Positioning Motor however if you use with other bran s piease refer to one published by those manufacturer We sincerely hope that you ...

Page 3: ...djusting on sewing machine 20 1 Adjusting thread trimming mechanism 20 2 Adjusting tension releaser 24 3 Adjusting thread wiper 25 4 Adjusting qichback device 25 5 Adjusting presser lifter 26 6 Adjusting synchronizer 27 11 Adjusting motor 28 12 Maintenance of motor 31 13 Trouble shooting 35 1 In relation with the sewing machine bead 35 2 In relation with control box and N P Motor 37 From the libra...

Page 4: ... feed dogs presser feet and needle plates can be used with this machine in other words such parts are common with other lock stitch sewing machines 9 Built in thread wiper ensures much productivity 200 10 The solenoid reverse mechanism operates with a soft touch and permits even the beginner to sew backward easily Type 400 specifications 11 The pneumatic thread cutter sewing machine has a presser ...

Page 5: ...lenoid type Air type Aut refuter presser foot Nil Nil Nil Air type High speed 4 500 s p m Sewing speed Slow speed 215 r p m Rotary hook Specially designed hook BROTHER Needle Positioning Motor or the like Motor MD 931 811 MD 931 812 MD 931 814 MD 931 815 3 phase 400W NOTE 1 Single phase motor is of different specs 2 Specs on machine head is referred to the instruction manual of Model DB2 B705 2 Fr...

Page 6: ...s for 200 2 Control box 3 Needle Positioning Motor 4 Thread trimming mechanism 1 Construction As per Fig 1 there are composed of thread trimmer clutch 0 Holder fj Knife 0 Lower thread finger G Holder plate e Stopper C and Solenoid fj 2 Procedures I At high speed As per Fig 2 1 stopper presses down cam and holder is stationed 3 Fig 1 1 1 Fig 2 1 From the library of Superior Sewing Machine Supply LL...

Page 7: ...umference with the projected portion of clutch li thus holder rotates together with clutch At that time solenoid is already disengaged and stopper is positioned at its original position and it contacts with the face of holder Fig 2 3 N Just before ending thread trimming As holder is rotating to the position of afore mentioned position I stopper is climbing up to cam thus cam is pressed down Fig 2 ...

Page 8: ...oned procedures upper and lower threads are trimmed as follows I The hook point gets upper thread At this time needle comes up 2 2 mm from its lowest position but the signal for thread timming is given at its lowest position Fig 3 1 II Knife moves Signal for thread trimming is given and by the action of clutch knife moves with rotary hook s rotation Fig 3 2 5 Solenoid OFF 1 1 1 1 Fig 2 5 From the ...

Page 9: ... plate thus the upper and lower thread is separated Fig 3 3 At this time the thread take up lever is positioned at a bit higher point from its lowest position upper shaft angle appr 330 and as per Figs 3 4 and 3 5 the threads are separated In case of sooner or later timing it affects on separation of upper and lower threads then it causes error of thread trimming 6 Fig 3 4 Fig 3 5 From the library...

Page 10: ... the next stitch Fig 3 6 4 Tension releaser In case that the signal for thread trimming is given the tension release solenoid 0 is functioned pulled tension release lever f pushed tension release bar 8 with the intermediate action of connecting bar 0 and plate 8 and opened tension discs t In case that the signal for needle up position is given the tension release solenoid is off thus tension discs...

Page 11: ... to its original position so that the machine sews forward again Fig 6 7 Automatic presser lifter Type 500 When the power is switched on the air pressure inside presser lifter cylinder 0 increases to move the piston which drives knee lifter 8 via piston operating link f to push up push rod 8 and the presser foot Fig 7 When the treadle top plate is slightly stepped on the air pressure inside presse...

Page 12: ...nchronizer f Needle up position 8 Needle down position 0 Thread trimming 0 Slow speed motor 0 Main motor 9 f Clutch lever 0 Brake 0 Clutch tii Switch for thread trimming CD Treadle pedal Fig 8 From the library of Superior Sewing Machine Supply LLC ...

Page 13: ...6 Electric circuits 100 200 400 Type l 8 0 ll C 0 C 12 0 12 24 ll C 12 AC 27V SV 12 I ____j 11 1 Fig 9 10 From the library of Superior Sewing Machine Supply LLC ...

Page 14: ...I 500 Type I 11 D C From the library of Superior Sewing Machine Supply LLC ...

Page 15: ... speed motor By pressing the treadle pedal further the clutch contacts high speed motor then the sewing machine runs fast 3 Needle down position In case that you may put the treadle pedal to be a neutral position the micro switch is disengaged the sewing machine runs slowly by the slow speed motor and stops at needle down position 4 Thred trimming thread wiping and needle up position After the nee...

Page 16: ...2 inches for 60 liz J3 inches for 50 I 1 z 2 Motor pulley change Ir you wish to change the motor pulley please take note the followings Fig 11 I Remove pulley cover 0 and change the pulley f 2 f asten securely the nut 3 Get the proper tension of V bell See the instruction manual of Model D82 8705 If the tension is too loose the stop po sition is not accurate 4 In case you may change the position o...

Page 17: ...ricity connect the earth wire C out of table hinge to the bracket of motor III Pass the plugs through the hole in the table and connect them to the plug sockets leading from control box C safety device ct valve box 0 and treadle 8 Fig 13 Fig 14 A plug for Types 100 200 400 500 B plug for Types 100 200 400 500 C plug for Type 400 D plug for Type 500 E plug for Type 500 F plug for Types 100 200 400 ...

Page 18: ...an be regulated with the valve box reduc ing alve If the air pressure is too low loosen hexagonal nut 0 and turn knob f clockwise If the air pressure is too high turn the knob counterclockwise operate the back tack button or the treadle to lower the air pressure and then increase the air pressure again After its regulation tighten the hexago nal nul to fix the knob Fig 19 2 If water collects insid...

Page 19: ...utral position 2 Make sure whether slow speed motor runs smoothly pressing the treadle pedal lightly 3 Make sure whether the sewing machine stops at the needle down position when the pedal is positioned at the neutral after pressing the pedal at the front 4 Make sure whether the sewing machine stops at the needle up position after knife s rotation when the pedal is pressed at the rear 5 After maki...

Page 20: ...eakage at the beginning Fig 22 2 II Make sure the upper thread is given out of thread stand without much resistance After thread trimming there causes thread off at the beginning because of short upper thread out of the needle eye III In case of skip stitches the upper thread cannot be trimmed although the lower thread can be trimmed N In order to avoid the skip stitch and upper thread off at the ...

Page 21: ...ead tension to turn the adjusting screw 8 putting the bobbin into the bobbin case Fig 25 NOTE If you feel the unevenness to pull the thread out of bobbin case correct the shape of tension spring Incorrect tension of the bobbin case causes following troubles a In case of excessive tension lower thread will jam in the bobbin case due to idle run b In case of weak tension not properly trimmed with th...

Page 22: ... f with your finger as per Fig 26 Turn the pulley and get the position so as to loosen flat head screws for knife Fig 27 Change knife 8 by loosening flat head screws C At that time change the knife only although spacert and lower thread finger 0 are removed Fig 28 Standard 0 5mm Spacer thickness Thick material 0 7mm Needle plate Standard 0 2mm washer thickness Thick material 0 5mm 20 Fig 26 Fig 27...

Page 23: ...letion turn the pulley toward you and get the knife positioned at its beginning II Adjusting knife holder In case that you may remove knife holder 8 turn the holder about half rotation and at this position remove holder bracket 0 then holder Adjust the position of holder bracket so that holder moves smoothly without n uch clearance After completion fasten the screw securely Fig 30 III Adjusting st...

Page 24: ...or second tooth of knife holder and stops Fig 32 If knife holder drops prior to the correct position fasten stopper guide em so that it may be posi tioned far from lower shaft Fig 33 IV Adjusting solenoid for thread trimming Fix solenoid so that its stroke may be 3 5mm Fix stopper guide so that the left surface of stop per may be in contact with surface of holder bracket Then in case that you may ...

Page 25: ... If you remove the needle plate you may find out clu tch adjusting holes as per fig 25 T urning the pulley tO cHcl you put the hexagonaI spanner into the hole and get the position of clu tch so that the centre of needle meets ith hook point hen nexl to A hole meets hole a Fig 36 In case of adjustment loosen at first scrc s c and D and lastly sere putting the spanner into B and turn ing the pulley ...

Page 26: ... causes missing of thread trimming 2 Adjusting tension releaser 1 Adjusting tension release solenoid Fix tension release solenoid 0 on the arm at that time seeing from rear cover fasten ten sion release Je er f so that it is positioned at the lowest when you turn it clockwise hen fixing tension release Je er side face of tension release lever should be in Iine ith the end of solenoid shaft 8 Fig 4...

Page 27: ...install the base on the arm Type 400 Ill Install the cylinder support to which the re verse cylinder has been attached on the arm Assemble the lever and reverse cylinder 8 together Type 500 Fig 42 N Backward stitches can be adjusted to a shorter length than forward stitches with the reverse stopper When stopper knob 0 is turned counterclock wise backward stitches will become shorter V If backward ...

Page 28: ...fere with thread wiping The valve box has an adjuster for regulating press er rising speed When its knob is turned clock wise the speed decreases Fig 45 VI The tension of treadle top plate 0 can be adjusted by regulating the tension of pull spring CD by moving in or out treadle pull spring hook 0 If the treadle top plate tension is too great the machine will start running before the presser foot l...

Page 29: ... Adjusting position of thread trimming signal Adjust the position of thread trimming signal so that lead switch f is in line vith magnet 0 at the needle bar s lowest position The adjustment is made by moving the position of lead switch Fig 49 27 Fig 47 Fig 48 Fig 49 From the library of Superior Sewing Machine Supply LLC ...

Page 30: ... up lead switch 8 Fig 49 by loosening it screw so that the distance from point of needle and top surface of needle plate may be 7 lOmm Fig_ 51 11 Adjusting motor 1 Adjusting clutch play After long usage of the motor causing wear of clutch lining thus the play becomes too large adjust it as per following procedures Fig 52 1 Loosen nut 0 screw 8 and 0 2 Pull clutch lever downward and adjust the play...

Page 31: ... you may gel inching by merely pulling your feel on the treadle pedal or may not gel it by pressing it lightly as per follO ing procedures Loosen nut 0 and adjust bolt f Fasten bolt 0 the hea ier the weight and loosen it the lighter Afte r adjustment is over fasten nul 0 not to mo e bolt f Fig 54 1 2 Adjusting weight at thread trimming Loosen nut 8 and adjust bolt 0 Fasten bolt 0 the heavier the w...

Page 32: ... at slow speed d At the above condition turn VR 1 counter clockwise very clowly and you will find out the position where sewing machine stops at the needle down position then turn VR 1 about 300 counter clockwise e Switch off and put rear lid onto control box 2 Adjusting thread wiper a Remove rear lid of control box b Turn VR 2 f clockwise and after needle up position and time to begin to operate ...

Page 33: ...Switch on press the treadle pedal light and get it at neutral position Press down the treadle pedal by your heel after needle down position then fasten bolt slowly pressing it by your finger as per Fig 42 and sewing machine moves about 120 and gets needle up position d Detatch the treadle pedal and turn bolt about 120 and fasten it with nut 8 Fig 57 2 Changing linings In case you replace the parts...

Page 34: ...tainer 0 and the other end into the hole in disc 0 on the other side and then attach them to the motor shaft g The hole in disc 0 is about 60 away from the elliptical end of the motor shaft Fig 60 1 so turn disc 0 about 60 counterclockwise and fix it Fig 60 2 h Insert the spline shaft and tighten washer mwith screw fi i Install motor 8 with screws f j Insert auxiliary motor cord plug 0 into the pl...

Page 35: ...l 0 b Remove screw 8 and replace lead switch C c To put the terminal 0 must be done with red wire to be sewing machine pulley Fig 64 NOTE Do not knock or drop LEAD SWITCH to give extra ordinary shocks 34 Fig 64 From the library of Superior Sewing Machine Supply LLC ...

Page 36: ...read trimming signal ADJUSTMENT At the needle s lowest position get the synchronizer magnet in line with lead switch for thread trimming See Page 27 28 6 e Knife does not move CAUSE Solenoid does not function ADJUSTMENT I Make sure that you press the treadle pedal by your heel II Check the circiut See Page 41 13 III Adjusting of knife stopper See Page 21 23 Fig 31 32 33 34 35 f Thread trimming sig...

Page 37: ...osition of tension release lever collar and upper tension regulator and get the correct positions c CAUSE Too high the position at the needle up position ADJUSTMENT Get weak tension also check the thread passes in order to get smooth supply of the upper thread d CAUSE Incorrect combination on thread and needle size ADJUSTMENT In case of thinner thread against needle size it causes such a trouble t...

Page 38: ...g time CAUSE Presser foot is automatically raised too soon ADJUSTMENT Adjust presser foot operating time b Thread wiper cannot remove upper thread from work CAUSE Uper thread too long ADJUSTMENT Adjust pre tension CAUSE Cloth and presser foot have too great resistance ADJUSTMENT Replace presser foot with one having CAUSE Operating time too short ADJUSTMENT Adjust operating time CAUSE Thread wiper ...

Page 39: ... switching on check the voltage between 2 and 3 2 and 7 3 and 7 If the tester shows the voltage you are now using there it is alright d CAUSE Mal winding on motor ADJUSTMENT Replace motor itself 3 Reverse rotation of high speed motor a CAUSE Electricity is not proper ADJUSTMENT Change two wires out of three NOTE The reverse rotation cannot be obtained with this BROTHER N P Motor as BROTHER clutch ...

Page 40: ... micro switch for high speed sewing plug in 3P plug and switch on Push the pull rod and if the sewing machine runs at slow speed the adjustment is not correct II In case that the sewing machine does not run being short between the termi nals for micro switch and if the sewing machine runs at slow speed micro switch is out of order III In case that the sewing machine does not run in step I wire is ...

Page 41: ...at its needle down position a CAUSE Weak tension of V belt ADJUSTMENT Tighten it b CAUSE Out of adjustment on the timer ADJUSTMENT In this case stop position is at needle down position or too much irregular Check the timer and correct it c CAUSE Out of order on reed switch for needle down position ADJUSTMENT Sewing machine stops in any position Replace reed switch 1 0 Sewing machine stops at needl...

Page 42: ...movement P C B is alright but solenoid for thread trimming is out of order II Check the voltage between 4 and 6 If the tester shows a slight movement P C B is alright but solenoid for thread releasing is out of order c CAUSE Reed switch for thread trimming is out of order ADJUSTMENT 1 Being off 6P plug of synchronizer set the needle at its do wn position switch on be short the circuit 2 and 6 on t...

Page 43: ...tch is out of order ADJUSTMENT 1 Being off 9P plug for thread wiper switch on after making sure that the needle is at its down position and let the treadle pedal press down by your heel At this time check the voltage between 7 and 8 on the control box If the tester shows a slight movement circuit is alright but solenoid for thread wiper is out of order If the tester does not show a movement P C B ...

Page 44: ...USTMENT Pull out reverse 6P plug large check resistance across Pins 1 and 4 on machine side Nothing is wrong if tester reads neither 0 ohm nor infinity If nothing is wrong with them reverse solenoid is mechanically faulty b CAUSE Power circuit board faulty Shortcircuit Check voltage About 24V ADJUSTMENT Pull out reverse 6P plug large shortcircuit Pins 3 and 6 on control box side close power switch...

Page 45: ...esser coil is faulty if voltage is about DC 30V c CAUSE Presser coil has wire breaks Check resistance About 500 ADJUSTMENT Pull out 6P plug large check resistance across Pins 3 and 6 on machine side If tester reads 0 ohm or infinity presser coil is faulty if tester reads neither 0 ohm nor infinity air valve or its related part is faulty d CAUSE Control circuit board faulty presser 2P cord on contr...

Page 46: ...MEMO 45 From the library of Superior Sewing Machine Supply LLC ...

Page 47: ... M EMO 46 From the library of Superior Sewing Machine Supply LLC ...

Page 48: ...MEMO 47 From the library of Superior Sewing Machine Supply LLC ...

Page 49: ...MEMO From the library of Superior Sewing Machine Supply LLC ...

Page 50: ...1 6110170 Printed in j apan From the library of Superior Sewing Machine Supply LLC ...

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