Brother Electroknit KH-910 Service Manual Download

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Summary of Contents for Electroknit KH-910

Page 2: ...ad 12 3 3 Testing the AC low voltage circuit 12 3 4 Checking the AC input 13 3 5 Checking the fuse F601 14 4 Checking the DC section 15 4 l The card feeding dial does not ratchet but the buzzer makes a sound 15 4 2 Checking the circuits which are worked by 5V power supply 16 Vll Checking the needle selector solenoid 18 1 Live test for the needle selector solenoid 18 2 Check the needle selector sol...

Page 3: ...rds and when adjusting the mechanical parts 2 When removing connectors take care not to pull the cords themselves 3 The screws and nuts should be tightened properly 4 Do not lose the screws nuts and washers and do not leave them in the machine they may cause a short circuit 5 Take care not to damage the cords and the printed circuit boards with heat when soldering 6 The electronic components used ...

Page 4: ...ot move The clearance between the separation cam and the needle selection cam must be less than 0 5 mm Tuck cam operation When left and right tuck cam buttons are depressed by gently lifting the left and right tuck cam they should return to their original position when released When the cam button is set to plain the end of the tuck cam fingers can be gently moved and they should return to their o...

Page 5: ...gap between the sinker plate and the needle The fabric floats stitch float 2 1 The sinker plate is in contact thegatepegs or there is too much gap between the sinker plate and the gate pegs 2 2 The sinker plate keep the knitting needles up or there is too much gap between the sinker plate and the needle Position adjustment of the sinker plate Fig 2 1 Mounting dimensions of sinker plate The sinker ...

Page 6: ...ing dimentions of guide cam A 1 Loosen the right and left guide cam A clamp screws and the plate clamp nut Clamp again after adjusting the distance between guide cam A and the carriage rear leg to 56 5 mm Fig 4 Note 1 lf guide cam A is not more than 56 5 mm apart from rear leg the gap between guide cams A and B will be too narrow for knitting needle Note 2 lf the distance between guide cam A and t...

Page 7: ... adjustment be careful not to damage the leaf spring Plate cam B Fig 7 3 Wrong position of the feed hook 3 1 The feed hook is fixed with the feed hook clamping screw on the side of the si nker plate 3 2 Loosen the feed hook clamping screw and move it inward and the mount of feed will get smaller but move it outward the amount of feed will get larder Fig 8 Amount of feed Amount of feed get larger g...

Page 8: ...st be right angled The stem of needles and sinker plate must be kept in light contact with each other Fis 10 5 When main cam is replaced 5 1 Remove right and left clamping screws for the L carriage cover and take off the cover 5 2 Remove clamping screws for separation cam and take off the separation cam 5 3 Remove clamping screws for main cam and take off the main cam 5 4 From the back side of the...

Page 9: ...le selector solenoid the armature does not move smoothly Put the specified grease on the armature sliding parts of the solenoid yoke 2 4 Ihe spring for the armature is broken Replace the spring with a new one K carriage movement is too heavy 3 1 When the K carriage does not move The rotary cam lever does not move correctly After making sure that the rotary cam lever is not bent adjust the card rea...

Page 10: ...ter collar stopper screws The rotary cam slides to right 2 Take the clearance of 0 2 0 6 mm TYP 0 3 mm between the rotary cam and the rotary cam adjuster collar then fasten the two rotary cam adjuster coller stopper screws securely Fig 1a lf the machine has not got a washer between thw rotary cam adjuster collar and the rotary cam holder R the clearance must be 0 5 0 8 mm TYP 0 6 mm Note When adju...

Page 11: ...main P C B assembly with a new one 2 3 The ready lamp does not light 1 Set the tester to the DCV 10 range connect the red terminal of it to the pin of the red cord and the black terminal to the pin of the black cord Check the voltage between the red cord and the black cord of the connector sl lf it is 5V t 5 there are some defects on the main P C B Replace the pattern case whole unit or the main P...

Page 12: ... card dial ratchet ls mark sensor left position ls ready lamp ls pilot lamP See item 2 2 2 come to main P C B Replace main P C B flash on and off Check the route between the A C lnput and pilot lamP Check the batteries ls pilot lamp See A C section Fault repaired No ...

Page 13: ...ge 90 If the voltage of the batteries is over 2 6V there are some defects on the battery checking circu it Replace the pattern case whole unit or the main P C B with a new one Checking the AC section WARNING Testing the AC mains section is dangerous and must be done only by qualified personel 3 1 Test the AC main outlet using an appliances know to be working eg Reading lamp etc 3 2 Testing the mai...

Page 14: ...er cords on the AC input are disconnected lr Fig 20 2 Checking the fuse F601 a Disassemble the AC input Fig 21 1 Pull out the power cord from the AC inlet 2 Remove the three screws forthe needle bed and the three plastic rivets for the lower side plate R assembly 3 Remove the two screws for the AC inlet 4 Take off the lower side plate R assembly 5 Remove the screw of the cord presser plate and tak...

Page 15: ...n the lower side plate R assembly The capacity of the fuse is different according to the rated voltage Replace the fuse by referring to the indication on the noise filter board 100V 115V inputspec lAFuse 127Vinputspec 0 8A Fuse 22OV 240V inputspec 0 5A Fuse After replacing the fuse find and repair the cause of the defects Then turn on the power switch lf the fault is still present the fuse will be...

Page 16: ...ctor solenoids Check the resistance of the needle selector solenoids by referring to the item Vll 2 lf the indicator of the tester shows 0Q replace the needle selector solenoid itself or the unit with a new one Locate the short circuit on the stepping motor for card feeding by referring to the item X 4 4 2 4 Checking the DC section 4 1 The card feeding dial does not ratchet but buzzer makes a soun...

Page 17: ...there are some disconnections on the lead wire of the stepping motor or the connector 54 and P4 are not contacted correctly 4 2 Checking the circuits which are worked by 5V power supply After replacing the fuse F2O2l find and repair the cause of the defects by referring to the following 1 To locate the short circuit parts on the power supply board Pull out the connector S1 from the main P C B and ...

Page 18: ...the connector S5 lf it does not show 0Sl there is no short circuit on the encoder board Fig 31 5 To locate the short circuit parts on the mark sensor P Check the resistance between No 3 and No 2 pin of the connector 1310 Set the tester to the O x 1 range and connect the black terminal to No 3 pin and the red terminal to No 2 pin Fig 32 lf it does not show 0O there is no short circuit on the mark s...

Page 19: ...ck the armatures of needle selector solenoids They must be energised Fig 33 Set the tester to the O x 1 range Check the resistance between No 9 or No 10 pin of the connector 52 and the pin of the connector which corresponds to the unenergised armature lf the indicator show S there are some disconnections on the solenoid itself and or the lead wire of the connector Remove the machine body from the ...

Page 20: ...ral key in order the number of the pushed key appears in the right side of the display The computor will only accept a maximum of 3 key entrys Push the CE key to clear the display then continue to check the numeral keys The buzzer makes a sound whenever the key is pushed 4 Check the CR key Cn Correction Push the CR key Error lamp is flashes on and off Push the CE key Error lamp will go off 5 Check...

Page 21: ... lit up the pattern position key lamp which is located between the yellow and green key is also lit up While the pattern position key lamp is on all the keys except the M key yellow and green key do not work Push the pattern position key yellow or green according to the information refer to the illustration befor entering the numeral key When the pattern position key is pushed the pattern position...

Page 22: ...re left in position B The pattern variation switch No 6 NEGATIVE does not work correctly Replace the pattern case whole unit or the main P C B assembly with a new one 3 There are many needles selected to position D lf this incorrect needle selection appears when moving the K carriage from right to left the adjustment of the level for the right position sensor is wrong lf it appears when moving the...

Page 23: ...ne 5 10 Set all the pattern variation switches to the lower position and remove the sinker plate assembly frbm the K carriage then put reference mark on the center of the MC cam button Fig 40 Fis 40 5 11 Set the change knob to position KC l or KC ll and pass the sensor magnet in front of the right position sensor Move the K carriage until the reference mark comes to the yellow 4 needle and then op...

Page 24: ...n sensor 6 1 Bring bacr all the needles at position A and keep the sensor magnet of the L carriage away from the left position sensor 6 2 Remove the needle selector panel assembly row counter panel and pattern case whole unit When removing the pattern case whole unit it is not necessary to pull out the connector from the main P C B Put the pattern case whole unit at the back of the machine and tak...

Page 25: ... sensor is moved outside rightside of the green 2 needle raise the voltage of the check pin CH401 to 2 0V gradually After adjusting the voltage check the position were the mark sensor is moved by operating the item 6 8 and 6 9 lf the mark sensor is not moved at the correct position even if the voltage of the check pin CH401 is raised to 2 0V adjust the mounting position of the left position sensor...

Page 26: ...e voltage of the check pin CH401l and make sure that it is less than 2 7V f it is more than 2 7Y lower the voltage of the check pin CH401l to 2 7Y and adjust the mounting position of the left position sensor board assembly 25 ...

Page 27: ...ng to item llX 6 and then push the CF key lf the position of the pattern selector and programming are not changed after checking the item llx 6 there is no need to set and program again before checking this item Just push the CF key The pattern card is fed into the card inlet until the number 1 of the L window comes to the card inlet and the mark sensor reads the first row of the pattern card twic...

Page 28: ... to the parts catalogue biljj sprocket wheel 47 card feeding shaft 48 v stepping motor o 3 card guide A card fedding dial 70 d Cj 75 6y mark sensor clamp screw 5l u u o lllttlllltltllllllllllllttlltlllllllllllllllllllllllllllllll gear 253 spiral shaft for the mark sensor 27 ...

Page 29: ...out replace it with a new one Set the mark sensor clamp screw to the spiral shaft correctly and fasten it 2 The DC motor gear or the gear Z53 are worn out Replace the DC motor or the gear 253 with a new one 3 3 The DC motor does not turn Check the fuse F201 which is installed on the power supply board lf the fuse F201 is broken replace it with a new one after replacing it check the driving circuit...

Page 30: ...0 The gear for the stepping motor and the gear 2 6O are engaged too tight Fis 50 qt 9A qt 9A fG qG 90 AA fit a AA 9r1 8i ta ta 4A t a G IG aa t 4A AA ta ta la ffi ca x a qa tfi cat m a a t a AE t t a ca t1 AA A t 4 t ta ta 4A 9A a ca t A1 A t t xt ta ta ta 8A aa m ta 4A ca Adjust the engagement of both gears by moving the gear 260 to right and left Take the smallest play between both of them and t...

Page 31: ... as the bottom line of the windows Fig 53 lf it is not adjust the position of the pattern card lf the position of the pattern card is correct check the mark sensor circuit fi aat Ai a3 la ffi AA r1 AE Ai A Ai g a AI a It G ta A t Q fa 1 t AA ta afi 9t t A1 a t AA qe At Ir1 Q ffi aa fit 1 ia na ffi A1 a ta G i 9A c 4A la aG na ffi ta 4G A1 na a A1 A t fa a gt cct ffi 7 Adjusting the card reader 7 1...

Page 32: ...he screw of the gear 260 When fastening the screw of the gear 260 keep the mark sensor at the position where the indicator shows the smallest voltage Turn off the power switch and make sure that the pattern card is fed smoothly by the card feeding dial Mount the needle selector panel assembly and insert the pattern card to the card inlet and set the set line of the pattern card to the card inlet c...

Page 33: ...om line of the card guide A window When fastening the screw reduce the clearance between the gear 260 and the gear of the stepping motor Make sure that the set line of the pattern card is set to the card inlet correctly lf there is a gap between them adjust the mounting position of the gear 260 and fasten the screw of the gear 260 firmly Loosen the screw of the card reading element the card readin...

Page 34: ... of the pattern selector switch and or the programming are changed re program the information according to the item llX 6 Make sure that the set line of the pattern card No 1 is set at the card inlet and push the CF key 1 Pattern variation switch No 1 PATTERN A REVERSE For the first row the following needle are selected to position D And for every odd row Y yellow 26 24 18 16 10 8 2 G sreen 2 4 1O...

Page 35: ... the top covers Disassemble the needle selector panel assembly row counter panel and pattern case whole unit in that order 1 Removing the needle selector panel assembly Remove the two needle selector panel clamp screws and lift the left side of the panel until the card feeding dial comes out from the slit of the panel Slide the panel to the left slightly and take it off from the lower side plate R...

Page 36: ...unite by force C Pull out all the connectors All of the except the connectors 51 have locklevers squeeze to release before removing connector Fig 63 1 2 Assembling the top covers Needle selector panel assembly row counter panel and pattern case whole unit Assemble these three panels in the reverse order 1 Assembling the pattern case whole unit A For location of the connector refer to the connector...

Page 37: ...ION SOLENOID P C B MAIN P C B 1 81 101 51 81 101 I T6 l l PSlfPA I FTla P PZ 1 ENCODER P C B POWER SUPPLY P C B CONNECTION DIAGRAM MARK SENSOR RIGHT POSITION SENSOR P C B STEPPING MOTOR DC MOTOR POWER TRANSFOBMER AC lNLET NOISE FILTER P C B Fis 64 I 36 ...

Page 38: ...ounted to the pattern case by twelve screw and the main P C B is mounted to the spacers of the operation P C B by five screws There two printed circuit boards consist of the LSl lC etc which can be damage by static electricity When handling the printed circuit boards hold the edge of the board and wear an earth wire fot the prevention of static electricity There two printed boards must be kept in ...

Page 39: ...fasten the screws 6 Place the FP cable insulation board under the flat cable and faster the two screws 7 Mount the main P C B to the spacer of the operation P C B and fasten the screws 8 Stow the batteries in the battery case and put them in the plastic bag Stow the battery cord in the battery box and connect it to the battery case and then stow them in the battery box NOTE After replacing the mai...

Page 40: ... 51 1 of the power supply P C B 3 Mount the pattern case setting base and the carrying case reinforcing plate A Fasten the screws for the rear rail side provisionally B For the carrying case side insert them between the timing belt cover L and the setting plate of the carrying case and fasten the screws securely 5 Remove the three screws and take off the power supply P C B Fig 71 Fig 72l C lnsert ...

Page 41: ...At t ffi e 3r afi e Wire bindcr Fig 76 4 2 Assembling the encorder board assembly Fig 77 1 Set the hole of the encoder board to the bosses of the encoder board holder and then fasten the screws 2 Mount the right position sensor board 3 Connect the connector 510 to Pl0 of the mark sensor 4 Set the encoder signal cord holder to the card reader Take off the encoder signal cord cover from the card rea...

Page 42: ...ss the encoder cord under the pattern case setting base and connect the connector 55 to the main P C B 8 After replacing the encorder board assembly adjust the voltage of the right position sensor Replacing the power transfi rmer 5 1 Disassembling the power transformer 1 Remove the top covers Pull out the connectors from the main P C B 2 Pull out the connector 59 from the power supply board 3 Remo...

Page 43: ...he lead wire of the transformer with the wire binder pull it to the left and do not leave slack ta 4A 8i AE AA a A1 aa t qa A1 ta ffi ffi ta a a ta 4A a tG IG aa ta a ea ta AE a ta aa a t IG la a fa ta ta ta ta ta 4A ta ca Q fa ta 8A qa tG 9G aa ffi ta a ta la a ta ta 9A N ta a Fig 82 C Turn the timing belt until the connecting part comes to the center of the rear rail D Remove the belt connecting...

Page 44: ...aa It AA q t A1 A t ta ffi rN D On the pully side pass the timing belt from the side of the machine body by fitting the belt connecting hole into the concave part of the pulley and feeding it to the rear rail side Fig 86 Fis 86 E Connect the timing belt by pulling the both ends of the timing belt The long hole in the timing belt and the concave part of the pulley must be set correctly when connect...

Page 45: ...om the rotary encorder Take care not to damage the comb part of the rotary encoder when removing the snap ring E Remove the washer under the snap ring and take off the rotary encoder assembly There is a washer under the rotary encoder and it will come out with the rotary encoder Take care not to loose the washer 2 Assembling the rotary encoder assembly A Put the washer onto the rotary encoder shaf...

Page 46: ...he card reader unit 1 Disassembling A Remove the top covers B Pull out the connector 54 of the stepping motor from the main P C B the connector S8 of the DC motor the connector S1 1 of the stepping motor from the power supply board and the connector 510 of the encoder board from the mark sensor C Cut off the wire binder which is located above the yarn tension stand rod and take off the encoder sig...

Page 47: ... 253 to the left side of the spiral shaft B Mount the spring mark sensor and the spring to the spiral shaft in this order and set the snap ring The spring has a single winding side and a double winding side Fig 94 To side plate double Fis 94 When mounting the spring to the spiral shaft set the double winding side of it to the side plate of the card guide A C Check the mark sensor and the position ...

Page 48: ...ght F Remove the card guide middle clamp screw and slide it to the left Take off the card guide middle 2 Assembling A Assemble them reverse order B Check the specular surface of the card guide middle and the guide A When assembling the card guide middle take the clearance between the card guide A and the card guide middle C Adjust the mark sensor and the position of the pattern card by referring t...

Page 49: ...MARCASENSOR F SCHEDA CONTROLLO PER SENSORE MARCANTE z s v PLEASE MAKE SURE NOT TO DIRTY THE ABOVE COLUMN ACHTEN srE BrrrE oanalir DASS DrE oBrGE zErLE NrcHT vERSoHMtJtzt wlRD VEILLEZ A NE PAS SALIR LA COLONNE SUPERIEURE ZORG ERVOOR DE BOVENSTAANDE KOLOM NIET TE BEVUILEN ASEGURESE DE NO MANCHAR LA COLUMNA ARRIBA FAVORISCANO DI NON SPORCARE LA COLONNA SOPRA ...

Page 50: ...ARCASENSOR SCHEDA CONTROLLO PER SENSORE MARCANTE 2 4 I V PLEASE MAKE SURE NOT TO DIRTY THE ABOVE COLUMN ACHTEN SIE BITTE DARAIJF DASS DIE OBIGE ZEILE NICHT VERSCHMUTZT WIRD VEILLEZ A NE PAS SALIR LA COLONNE SUPERIEURE ZORG ERVOOR DE BOVENSTAANDE KOLOM NIET TE BEVUILEN I ASEGURESE DE NO MANCHAR LA COLUMNA ARRIBA FAVORISCANO DI NON SPORCARE LA COLONNA SOPRA ...

Page 51: ...K1 060028 Printed in Japan ...

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Brother Electroknit KH-910, Service Manual

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