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Brother T-8422A Instruction manual

1. T 8421A 8422A 8452A 8722A 8752A 24 5 USING THE OPERATION PANEL BASIC OPERATIONS 5 USING THE OPERATION PANEL BASIC OPERATIONS 5 1 Names and functions e The operation panel keys cannot be operated while sewing is in progress Select the keys and set the number of stitches before starting sewing e Inthe case of keys with indicators the indicator illuminates when that function is operating and the indicator switches off when the key is pressed once more 16 15 4 The power indicator illuminates when the power is turned on 1 Main display e In start backtack display AB illuminates and the number of stitches for A and B are displayed e In end backtack display CD illuminates and the number of stitches for C and D are displayed e In continuous backtack display ABCD illuminates and the number of stitches for A B C and D are displayed e In fixed stitch display E or F illuminates and the number of stitches for E or F are displayed 2136M 2 Setting keys ese keys are used to set the number of backtack stitches for A B C an an e B Th ki d t t th b f backtack stitches for A B C and D and th number of fixed stitches for E and F en the ey is pressed the setting increases from 0 up to 99 Vv When th Akey is p d th tting i fi 0 up to 99 e When the V key is pressed the setting decreases from 99 down to 0 2137M 2138M 2139M 3 Start backtack key O When this key is
2. Problem Possible cause Page Uneven seam 2948M Is the presser foot pressure too weak Adjust the presser foot pressure Is the feed dog too low Adjust the feed dog height Is the bobbin scratched If the bobbin is damaged smooth it with an oiled grindstone or replace it 36 Large degree of puckering excess tension 2949M Is the upper thread tension too strong Make the upper thread tension as weak as possible Is the lower thread tension too strong Make the lower thread tension as weak as possible Are the thread take up spring tensions too strong Make the thread take up spring tension as weak as possible Is the thread take up spring operating range too large Move the stopper to as high a position as possible Is the presser foot pressure too strong Adjust the presser foot pressure Is the sewing speed too fast Use the sewing speed control keys to gradually reduce the sewing speed Is the thread take up amount too small Adjust the thread take up amount 35 35 36 26 37 Material slippage 2950M Is the presser foot pressure too strong Adjust the presser foot pressure 36 Lower thread is tangled at the sewing start Spinning of bobbin during thread trimming 2951M Is the bobbin spinning direction correct when the lower thread is being pulled Set the bobbin so that it turns in the opposite direction to the rotary hook Ils there too much th
3. 15 Stop lever T 8452A 8752A Safety devices 16 Thread take up cover The settings for this sewing machine are carried out using the operation panel 13 and so this panel is not used Settings made using this panel will not affect sewing machine operation 2 Thread wiper T 8422A 8452A 8722A 8752A 4 Quick reverse Actuator 6 Control box 8 Power switch 10 Reverse lever 12 Machine pulley 14 Cotton stand 17 Finger guard T 8421A 8422A 8452A 8722A 8752A 3 INSTALLATION 3 INSTALLATION A CAUTION Machine installation should only be carried out by a Do not connect the power cord until installation is qualified technician complete The machine may operate if the treadle is Contact your Brother dealer or a qualified electrician depressed by Mistake which could Tesultin injury for any electrical work that may need to be done Use both hands to hold the machine head when A tilting it back or returning it to its original position If only one hand is used the weight of the machine head may cause your hand to slip and your hand may get caught The sewing machine weighs approximately 50 kg The installation should be carried out by two or more people About the machine set up location Do not set up this sewing machine near other equipment such as televisions radios or cordless telephones otherwise such equipment may be affected by electronic interferenc
4. Feed dog height 1mm Needle DPx5 9 14 11 16 14 22 Motor AC servo motor 4 pole 550W Control circuit Microprocessor T 8422A 403 433 405 Max sewing speed 4 000 rpm 3 000 rpm Start backtackin and continuous backtacking Seed 250 1 800 rpm End backtacking speed 1 000 rpm Max stitch length 4 mm 5 mm Presser foot Lifting lever 7mm height Knee lifter 13 mm Feed dog height 1mm Needle DPx5 11 16 14 22 Motor AC servo motor 4 pole 550W Control circuit Microprocessor T 8452A 403 405 Max sewing speed 3 000 rpm Start backtackin and continuous backtacking speed E9009 TPM End backtacking speed 1 000 rpm Max stitch length 5 mm Presser foot Lifting lever 7 mm height Knee lifter 13 mm Feed dog height 1mm Needle DPx5 11 16 14 22 Motor AC servo motor 4 pole 550W Control circuit Microprocessor T 8722A 8752A 403 405 Max sewing speed 3 000 rpm Start backtacking and continuous backtacking speed eee 200m End backtacking speed 1 000 rpm Max stitch length 7mm Presser foot Lifting lever 7mm height Knee lifter 13 mm Feed dog height 1mm Needle DPx5 11 16 14 22 Motor AC servo motor 4 pole 550W Control circuit Microprocessor T 8421A 8422A 8452A 8722A 8752A 2 NAMES OF MAJOR PARTS 2 NAMES OF MAJOR PARTS lt T 8452A 8752A gt Bobbin winder 3 Lifting lever 5 Presser foot 7 Knee lifter assembly 9 Stitch length dial 11 Oil gauge window 13 Operation panel
5. even if the treadle is depressed However if the treadle is depressed backward the thread is trimmed models with thread trimmer and the sewing machine stops in the needle up stop position e If you press the RESET key 2 the warning icon 1 will disappear and sewing will be possible when the treadle is depressed e If you press and hold the RESET key 2 for 2 seconds or more the display will return to the initial value 29 T 8421A 8422A 8452A 8722A 8752A 6 USING THE OPERATION PANEL ADVANCED OPERATIONS 6 USING THE OPERATION PANEL ADVANCED OPERATIONS The operations described in this section should only be carried out by a technician 6 1 Names and functions 23 21 19 aie brother El 24 18 20 22 These are used for making advanced operating settings They should only be used by a technician 18 Slow start key e When this key is pressed so that the slow start icon 19 illuminates the first two stitches that are sewn immediately after the treadle is depressed backward are sewn at 700rpm After this the sewing speed corresponds to the treadle depression amount e f you press this key again while the icon 19 is illuminated the icon 19 will turn off 2172M 20 Correction key e When this key is pressed so that the correction icon 21 illuminates correction sewing can be carried out If the sewing machine is stopped sewing will be carried out at slow speed 250 rpm while
6. 8421A 8422A 8452A 8722A 8752A 10 3 INSTALLATION 3 4 Connecting the cords A DANGER Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet before opening the face plate of the control box Touching areas where high voltages are present can result in severe injury A CAUTION Q Contact your Brother dealer or a qualified electrician for any electrical work that may need to be done Do not connect the power cord until all cords have been connected The machine may operate if the treadle is depressed by mistake which could result in injury Be sure to connect the ground If the ground connection is not secure you run a high risk of receiving a serious electric shock and problems with correct operation may also occur 3 4 1 Opening the control box cover 1 Screw 2 Cover 1 Sewing machine cords 11 T 8421A 8422A 8452A 8722A 8752A Push in securely until the tabs 5 engage lt Removal gt T 8421A 8422A 8452A 8722A 8752A 3 INSTALLATION 1 2 3 4 7 pin head detector unit connector 10 pin operating panel connector 14 pin encoder connector 14 pin machine connector YS rove wv Refer to the following page for the 4 pin motor connector 2 Repeat cable tie 1 Repeat cable tie 2 Wire clip NOTE e Bind the cords in such a way that the connector does not get pulled out e All cords that come ou
7. may result Turn off the power switch at the following times The machine may operate if the treadle is depressed by mistake which could result in injury e When threading the needle e When replacing the bobbin and needle e When not using the machine and when leaving the machine unattended If using a work table which has casters the casters should be secured in such a way so that they cannot move Turn off the power switch before carrying out cleaning The machine may operate if the treadle is depressed by mistake which could result in injury Use both hands to hold the machine head when tilting it back or returning it to its original position If only one hand is used the weight of the machine head may cause your hand to slip and your hand may get caught A A A B Q Attach all safety devices before using the sewing machine If the machine is used without these devices attached injury may result Do not touch any of the moving parts or press any objects against the machine while sewing as this may result in personal injury or damage to the machine Use both hands to hold the machine head when tilting it back or returning it to its original position If only one hand is used the weight of the machine head may cause your hand to slip and your hand may get caught If an error occurs in machine or if abnormal noises or smells are noticed immediately turn off the power switch Then contact your nearest Broth
8. needle The machine may operate if the treadle is depressed by mistake which could result in injury 1 Turn the machine pulley to move the needle bar to its highest position 2 Loosen the screws 1 3 Insert the needle 2 straight in as far as it will go so that the long groove is facing inward and then securely tighten the screws 1 lt T 8421A 8422A 8722A gt Long groove Long groove T 8421A 8422A 8452A 8722A 8752A 16 4 PREPARATION BEFORE SEWING 4 2 Removing the bobbin AX CAUTION Turn off the power switch before removing the bobbin The machine may operate if the treadle is depressed by mistake which could result in injury lt Latch type gt 1 Open the slide plates 1 by moving them to the right and left 2 Pull the rotary hook latches 2 upward and them remove the bobbins 3 lt Bobbin case type gt 1 Open the slide plates 1 by moving them to the right and left 2 Lift up the latch 2 of the rotary hook and then remove the bobbin case 3 3 Remove the bobbin 17 T 8421A 8422A 8452A 8722A 8752A 4 PREPARATION BEFORE SEWING 4 3 Winding the lower thread A CAUTION Do not touch any of the moving parts or press any objects against the machine while winding the lower thread as this may result in personal injury or damage to the machine 1 Turn on the power switch 2 Place the bobbin 1 onto the bobbin winder shaft 2 Wind the thread several
9. pressed so that the indicator illuminates the number of start backtack aL 4 stitches 0 99 in the A and B stitch number displays is sewn 2140M 4 End backtack key QO When this key is pressed so that the indicator illuminates the number of end backtack ED stitches 0 99 in the C and D stitch number displays is sewn When the treadle is depressed backward end backtacking is carried out For models with thread trimmer the thread is trimmed automatically If the treadle has not yet been depressed backward the end backtack function can be set to ON the number of stitches can be changed and the function can be set back to OFF 2141M 5 Continuous backtack key re When this key is pressed so that the indicator illuminates the number of backtack stitches ABCE 0 99 in the A B C and D stitch number displays is sewn continuously The sewing viy machine sews a single cycle of A B C and D and for models with thread trimmer the thread is trimmed automatically 2142M 25 T 8421A 8422A 8452A 8722A 8752A 5 USING THE OPERATION PANEL BASIC OPERATIONS 6 Fixed stitch key When this key is pressed so that the indicator illuminates the number of stitches 1 1999 in the E stitch number display is sewn and then the sewing machine stops automatically 2143M 6 7 Name label key When this key is pressed so that the indicator illuminates fixed stitch sewing of the number of stitches 1 1999 in the E and F
10. sewing speed that is used when the treadle is depressed to 2 the maximum amount The sewing speed can also be adjusted while sewing is in progress e When the B key is pressed the sewing speed becomes faster e When the key is pressed the sewing speed becomes slower 2149M_ 2150M _ 2151M 13 Thread trimming lock key Models with thread trimmer only e When this key is pressed so that the indicator illuminates the sewing machine stops in the needle up position without thread trimming being carried out even if the treadle is depressed backward e If the indicator of the thread trimming key 9 is illuminated the sewing machine stops in the needle up position without thread trimming being carried out after the set number of stitches have been sewn 8 2152M 14 Half stitch key When the sewing machine is stopped the needle bar can be moved up and down by pressing this key 2153M 15 Lower thread counter display This shows the lower thread counter value The counter is reduced by 1 for every ten stitches sewn 2154M 16 Lower thread counter keys These keys are used to set the initial value for the lower thread counter Refer to p 25 2155M 17 This key is used to return the lower thread counter to its initial value and to cancel warning conditions Refer to p 25 J m ep m r oO lt 2156M T 8421A 8422A 8452A 8722A 8752A 26 5 USING THE OPERATION P
11. stitch number displays is carried out repeatedly 2144M 8 Pleat presser sewing key When this key is pressed so that the indicator illuminates the number of backtack stitches 1 1999 in the E stitch number display can be sewn by pressing the actuator S 2145M 9 4o hread trimming key Models with thread trimmer only e This can only be set for use together with the fixed stitch key 6 or the name label key 7 e When this key is pressed so that the indicator illuminates the set number of stitches start or end backtack stitches or fixed stitches are sewn and then the thread is trimmed automatically X 2146M 10 gt Cc J O oO lt This can only be set for use together with the continuous backtack key 5 the fixed stitch key 6 or the name label key 7 When this key is pressed so that the indicator illuminates the set number of stitches start or end backtack stitches or fixed stitches are sewn automatically and the thread is then trimmed models with thread trimmer only simply by depressing the treadle once g 2147M 11 Sewing speed control display O This shows the sewing speed when the treadle is depressed to the maximum amount ni 2148M 12 e If all bars are illuminated it indicates that the maximum speed can be set e fall bars are switched off it indicates the minimum speed 220 rpm Sewing speed control keys These keys let you adjust the
12. the actuator is being pressed NOTE e lf you press the actuator while sewing is in progress backtack stitches will be sewn e Correction sewing cannot be carried out while the indicator of the pleat presser sewing key 8 is illuminated e If you press this key again while the icon 21 is illuminated the icon 21 will turn off 2173M 22 Needle up down key Use this key to select whether the needle bar stops in the up position or the down position A when the treadle is returned to the neutral position and sewing stops e When the needle up icon L 23 is illuminated the needle bar stops in the up position e When the needle down icon 24 is illuminated the needle bar stops in the down position 2207M 2208M 2174M T 8421A 8422A 8452A 8722A 8752A 30 6 USING THE OPERATION PANEL ADVANCED OPERATIONS 6 2 Adjusting the needle up stop position 2210M 1 While pressing the needle up down key 1 turn on the power switch TO 2 n 0 xx will appear in the main display 2 m enea xx is the setting value for the needle up stop position bee and 0 is the default setting a 3 Press the A or V key 3 to change the setting value A AF for the needle up stop position py Ags cep SOo88 gage RAIL e If you press the A key the setting value will increase up to 20 and the needle up stop position will become TA dd lower D e If you press the Vkey the setting value
13. the recommended oil to use is lt Exxon Mobil Essotex SM10 VG10 gt lt Lubricating via the oil cover gt 1 Tilt back the machine head 2 Remove the rubber cap 1 3 Use the accessory oiler 2 to pour lubricating oil into the oil cover 3 until the oil level reaches the reference line 4 NOTE Do not fill with lubricating oil past the reference line 4 If you pour in too much lubricating oil it may spill out when the machine head is tilted back 4 Replace the rubber cap 1 5 Return the machine head to its original position If the lubricating oil level drops below the bottom 6 of the oil gauge window 5 be sure to add more oil lt Lubricating via the oil tank gt 1 Remove the rubber cap 1 2 Use the accessory oiler 2 to pour in lubricating oil until the oil level reaches the top reference line 4 of the oil gauge window 3 3 Replace the rubber cap 1 If the lubricating oil level drops below the bottom reference line 6 be sure to add more oil 9 T 8421A 8422A 8452A 8722A 8752A 3 INSTALLATION Bi Lubrication Apply 1 2 drops of oil to the places indicated by the arrows lt Minimum lubrication type only gt Do not apply oil for semi dry types lt T 8452A 8752A gt Rotary hook race left and right T
14. the slide plates at the left and right Remove the bobbin Clean the thread scraps from the rotary hook Install the bobbin and the bobbin case akWNDY lt Filling the oil tank gt Use only the lubricating oil Nisseki Mitsubishi Sewing Lube 10N VG10 specified by Brother If this type of lubricating oil is difficult to obtain the recommended oil to use is lt Exxon Mobil Essotex SM10 VG10 gt 1 If the lubricating oil level drops below the bottom reference line 2 of the oil gauge window 1 be sure to add more oil Refer to p 9 lt Checking gt 1 Replace the needle if it is bent or if the tip is broken 2 Check that the upper threads have been threaded correctly Refer to page 22 3 Carry out a test sewing T 8421A 8422A 8452A 8722A 8752A 38 9 CLEANING lt Draining lubricating oil gt 1 If the oiler 1 has filled with oil unscrew the oiler 1 and dispose of the oil inside it 2 Screw the oiler 1 back into the oil pan lt Minimum lubrication specifications gt Pour lubricating oil into the oil cover 1 about once every six months lt Semi dry specifications gt Pour lubricating oil into the oil cover 1 about as often as grease is applied Use only the lubricating oil Nisseki Mitsubishi Sewing Lube 10N VG10 specified by Brother If this type of lubricating oil is difficult to obtain the recommended oil to use is lt Exxon Mobil Essotex SM
15. too large Adjust the thread take up amount 16 18 22 36 Skipped stitches at sewing start Thread unravelling at sewing start A x SISE Pe 2946M e Is the thread take up spring tension too strong Reduce the tension of the thread take up spring e ls the thread take up spring operating range too large Raise the position of the stopper e Are the trailing lengths of the upper threads too short after thread trimming Adjust the pretension e Are the threads not being trimmed cleanly Sharpen the fixed knives or replace the fixed and movable knives if necessary e ls the needle too wide Try using a needle with a count that is one lower than the current needle e Is the sewing speed too fast at the sewing start Use the slow start feature e Is the needle up stop position too high Adjust the needle up stop position e ls the lower thread pressed by the plate spring 1 after thread trimming If the lower thread is not pressed by the plate spring 1 adjust the installation position of the movable knife 2 Lower thread 2947M e f sewing light or medium weight materials is a presser foot with slots on the underside or grooved feed dog being used Use a presser foot without slots Use a feed dog without grooves Grooves Slot 2944M 36 30 31 45 T 8421A 8422A 8452A 8722A 8752A 11 TROUBLESHOOTING
16. turn the power back on 2198M Items with a in the Page column should only be checked by a qualified technician Error code Possible cause Page Err 1 e Does the power supply voltage match the control box voltage specifications i N Overvoltage Check the voltage Se x Voltage rating label Te Err 2 e Is the electrical equipment connector inside the control box disconnected Overcurrent Insert the connector securely 3 Err 3 e ls the encoder connector inside the control box disconnected Encoder error Insert the connector securely 12 Th ea 3156M Err 4 e ls the motor connector disconnected from the control box Motor lock Insert the connector securely 13 e Has the machine locked up Turn off the power and then turn the machine pulley by hand and check that it turns easily ZUEN 49 T 8421A 8422A 8452A 8722A 8752A 11 TROUBLESHOOTING Error code Possible cause Page Err 5 Is the machine connector inside the control f box disconnected Safety switch Insert the connector securely 12 operated Is the machine head tilted back Return the machine head to its normal position 3157M Err 6 Was the power turned on while the treadle was still depressed Return the treadle to the neutral position and then turn on the power switch Voltage drop Err 8 This appears on the display when the sewing machine has been operat
17. 10 VG10 gt 1 Tilt back the machine head 2 Pour lubricating oil into the oil cover 1 until the oil level reaches the reference line 2 Refer to p 9 3 Return the machine head to its normal position 39 T 8421A 8422A 8452A 8722A 8752A 9 CLEANING 9 3 Applying grease When GREASEUP appears Semi dry specifications If GREASEUP flashes on the main display 1 and a buzzer sounds when the power switch is turned on it means that grease needs to be applied The sewing machine will not operate at this time even if the treadle is depressed Apply grease while referring to the following page lt To continue sewing temporarily without applying grease gt 1 Press the RESET key 2 2 The main display 1 will change to stitch number display mode and sewing will be possible when the treadle is depressed The power indicator 3 will flash NOTE If you do not apply grease when the GREASEUP notification appears the notification will continue to appear and the power indicator 3 will flash each time the power is turned on until you reset the notification by carrying out the procedure on the following page If you continue to use the sewing machine after the GREASEUP notification appears without applying grease or without carrying out the reset procedure Err100 will appear after a certain period of time and the sewing machine will be forcibly prevented from operating for s
18. 21A 8422A 8452A 8722A 8752A 20 4 PREPARATION BEFORE SEWING 4 5 Threading the upper thread CAUTION Turn off the power switch before threading the upper thread The machine may operate if the treadle is depressed by mistake which could result in injury Turn the machine pulley and raise the thread take up 1 before threading the upper thread This will make threading easier and it will prevent the thread from coming out at the sewing start Thread the left side thread first 21 T 8421A 8422A 8452A 8722A 8752A 4 PREPARATION BEFORE SEWING lt For all models except foundation specifications and T 8452A 405 gt Do not pass the thread through lt For foundation specifications and T 8452A 405 gt Center Pass the thread through TA Refer to p 37 If the tension discs are opened as follows the thread will become easier to thread lt Models with thread trimmer gt Press the tension release plate 2 lt Models without thread trimmer gt Press the tension release plate 2 or operate the lifting lever or the knee lifter to raise the presser foot The thread can be passed securely in between the tension discs T 8421A T 8422A 8722A T 8452A 8752A Pass the thread on the inside of the tab 3 T 8421A 8422A 8452A 8722A 8752A 22 4 PREPARATION BEFORE SEWING 4 6 Adjusting the stitch length 1 Unlock the stitch length dial 2 by turning the dial lock lever 1 to the r
19. 3 Power switch 1 Power switch 2 Screws 2 pcs X Operator 4 Oil pan 1 Head cushions left 2 pcs 2 Head cushions right 2 pcs 3 Oil pan 4 Oiler 5 Rubber cushions 1 Rubber cushions 2 pcs 2 Nails 4 pcs 6 Knee lifter complying bar 3 Knee lifter complying bar T 8421A 8422A 8452A 8722A 8752A 6 3 INSTALLATION 7 Machine head 1 Hinges 2 pcs 2 Machine head 3 Head rest NOTE Tap the head rest 3 securely into the table hole If the head rest 3 is not pushed in as far as it will go the machine head will not be sufficiently stable when it is tilted back 8 Operation panel 1 Operation panel 2 Screws 2 pcs Use for tightening rear cover 9 Cotton stand 1 Cotton stand NOTE Securely tighten the nut 4 so that the two rubber cushions 2 and the washer 3 are securely clamped and so that the cotton stand 1 does not move 7 T 8421A 8422A 8452A 8722A 8752A 3 INSTALLATION 10 Knee lifter plate 1 Knee lifter plate 2 Bolt oe and move the knee lifter plate 1 to a position where it is easy to use EC Loosen the bolt 3 and the bolt 4 lt Knee lifter adjustment gt 1 Turn the machine pulley so that the feed dog is below the top of the needle plate 2 Lower the presser foot 5 by using the lifting lever 4 Loosen the nut 6 Turn the screw 8 to adjust so that the amount of play in the knee
20. A 11 TROUBLESHOOTING Problem Possible cause Page 13 Machine does not operate e Is the sewing speed setting or backtack speed setting incorrect at high speed Use the sewing speed control keys to set the high speed 26 14 Machine stops during Is the fixed stitch key turned on sewing Press the fixed stitch key so that the indicator turns off 26 e Is the power supply voltage too low Check the power supply If the power cord is too long or too many appliances are being run from a single outlet this may cause voltage drops which will in turn cause the reset function to activate and stop the machine even if the power supply itself is normal 15 Nothing appears on the Is the power supply connector 2952M operation panel display disconnected from the control box Insert the connector securely 13 e Is the operation panel connector inside the control box disconnected Insert the connector securely 12 16 GREASEUP flashes on e This display is to notify you that it is time to apply grease the operation panel when Apply grease 40 the power is turned on T 8421A 8422A 8452A 8722A 8752A 48 11 TROUBLESHOOTING 11 2 Error code displays If an error code appears on the operation panel display 1 Make a note of the error code and then turn off the power 2 After the operation panel display has turned off eliminate the cause of the error and then
21. A Attach all safety devices before using the sewing machine If the machine is used without these devices attached injury may result A Turn off the power switch at the following times The machine may operate if the treadle is depressed by mistake which could result in injury e When threading the needle e When replacing the bobbin and needle e When not using the machine and when leaving the machine unattended Do not touch any of the moving parts or press any objects against the machine while sewing as this may result in personal injury or damage to the machine A Use both hands to hold the machine head when tilting it back or returning it to its original position If only one hand is used the weight of the machine head may cause your hand to slip and your hand may get caught 7 1 Sewing 1 While holding the two upper threads with your fingers turn the machine pulley by hand toward you until the lower threads come out onto the feed dog 2 Pull the lower threads toward you and check that they pull out smoothly thread Lower thread 3 Press the ON power switch 1 The power indicator 2 and 3 will illuminate 4 Use the operating panel to carry out the programming which is necessary for sewing Refer to the chapter on 5 using the operating panel 5 Depress the treadle to start sewing T 8421A 8422A 8452A 8722A 8752A 32 7 SEWING 7 2 Backtacking When the actuator 1 or the revers
22. ANEL BASIC OPERATIONS 5 2 Sewing start and end backtack stitches a 4 gt Example A 9 B gt 12 2157M Setting end backtack stitches ty D gt Example C 13 D gt 12 ON 2158M A D gt Ey Start backtacking is carried out After it has finished normal sewing continues for as long as the treadle remains depressed NOTE If the treadle is returned to the neutral position the sewing machine will continue operating until the set number of start backtack stitches has been sewn EM i yo End backtacking is carried out After it has finished the thread is trimmed automatically models with thread trimmer and the sewing machine stops in the needle up position NOTE e lf the treadle is depressed backward before sewing of the set number of start backtack stitches is complete end backtacking will not be carried out e For models with thread trimmer if the indicator of the thread trimming lock key is illuminated the sewing machine will stop in the needle up position without thread trimming being carried out 2160M 27 T 8421A 8422A 8452A 8722A 8752A 5 USING THE OPERATION PANEL BASIC OPERATIONS 5 3 Sewing fixed stitches 1 2161M Example E 120 From 1 to 1999 stitches can be set 2 K After the set number of stitches in E fixed stitches have been sewn the sewing machine stops in the needle position t
23. T 8421A TWIN NEEDLE DIRECT DRIVE LOCK STITCHER T 8422A TWIN NEEDLE DIRECT DRIVE LOCK STITCHER WITH THREAD TRIMMER T 8452A TWIN NEEDLE DIRECT DRIVE SPLIT NEEDLE BAR LOCK STITCHER WITH THREAD TRIMMER T 8722A TWIN NEEDLE DIRECT DRIVE LOCK STITCHER WITH LARGE HOOK AND THREAD TRIMMER T 8752A TWIN NEEDLE DIRECT DRIVE SPLIT NEEDLE BAR LOCK STITCHER WITH LARGE HOOK AND THREAD TRIMMER Thank you very much for buying a BROTHER sewing machine Before using your new machine please read the safety instructions below and the explanations given in the instruction manual With industrial sewing machines it is normal to carry out work while positioned directly in front of moving parts such as the needle and thread take up and consequently there is always a danger of injury that can be caused by these parts Follow the instructions from training personnel and instructors regarding safe and correct operation before operating the machine so that you will know how to use it correctly SAFETY INSTRUCTIONS 1 Safety indications and their meanings This instruction manual and the indications and symbols that are used on the machine itself are provided in order to ensure safe operation of this machine and to prevent accidents and injury to yourself or other people Indications DANGER The instructions which follow this term indicate situations where failure to follow the instructions may result in death or serious injury The instructions which
24. afety reasons If this happens apply grease and carry out the reset procedure If you continue to use the sewing machine after carrying out the reset procedure but without applying grease problems with the sewing machine may result T 8421A 8422A 8452A 8722A 8752A 40 9 CLEANING lt Applying grease gt NOTE Use only the grease lt BZL 301 SA2694 001 in the blue tube gt specified by Brother Do not use the BZL 300 SA2355 001 grease in the white tube with this sewing machine Do not use the BZL 301 SA2694 001 grease in the blue tube for any models except for those which are indicated with Use only the grease lt BZL 301 SA2694 001 gt specified by Brother Purchase the grease unit SA2693 001 to use for applying grease GREASE BZL 301 SA2694 001 2 Applying grease Follow the procedure below to apply grease to the places indicated by arrows on the next page Grease 1 i N N N N N 1 Insert the tip of the nozzle Apply grease without Tighten the screw to push in 1 all the way into the hole letting it spill out the grease in the part 2936M 1 Turn the power switch to OFF 2 Remove the screw 2 Refer to the next page for greasing locations 3 Apply grease to each of the holes until the grease overflows slightly 4 Tighten the screw 2 to push in the grease 5 Use a cloth to wipe away any ex
25. cations 40 10 ADJUSTING THE ROTARY HOOK LUBRICATION AMOUNT c0 43 11 TROUBLESHOOTING naianei 44 1121 SOWING 4 mieten Aidan madi 44 11 2 Error code displayS cccceceeeeeeeeeeeeeneeees 49 T8421A 8422A 8452A 8722A 8752A 1 MACHINE SPECIFICATIONS 1 MACHINE SPECIFICATIONS BROTHER INDUSTRIES LTD T 8421A T03 ABC DE F A 4 7 Rotary hook Standard hook Large hook B 2 5 Stitch function Fixed needle bar Split needle bar c 1 2 Thread trimmer 4 T D Quick reverse O O Thread wiper O E 0 3 Lubrication type Minimum lubrication Semi dry F 3 5 j Use For foundation For light weight ang For heavy weight materials medium weight materials 1 T 8421A 8422A 8452A 8722A 8752A 1 MACHINE SPECIFICATIONS T 8421A T3F T33 T03 T05 Max sewing speed 3 000 rpm 3 000 rpm 4 000 rpm 3 000 rpm Start backtacking and continuous backtacking speed 290 1 800 rpm End backtacking speed 1 000 rpm Max stitch length 4mm 5mm Presser foot Lifting lever 7mm height Knee lifter 13 mm
26. cess grease from around the screw 2 6 Apply grease to all locations shown on the next page in the same way 7 Carry out the reset procedure given on the next page NOTE Once the grease tube has been opened remove the nozzle from the tube attach the cap securely and store the tube in a cool dark place The grease should be used as quickly as possible When using the grease again remove any old grease from inside the nozzle first Store the tube away carefully once the tube has been opened otherwise the grease remaining inside the tube may deteriorate and this may affect its lubricating performance 41 T 8421A 8422A 8452A 8722A 8752A 9 CLEANING Turn the machine pulley until the screw 1 can be seen Use the tip of a screwdriver or similar to apply 5 10 mm beads of grease to the slide block slider 2 4 places at top bottom left and right of the slide block 3 After the grease has been applied carry out the following procedure to reset the cumulative time between grease applications 1 Turn the power switch to ON GREASEUP will flash in the main display 1 and the buzzer will sound 2 Press the RESET key 2 The main display 1 will 7 change to stitch number display
27. ct stitches SoS Ss pes E Upper thread 0894M Skipped stitches occur Increase the pressure Uneven stitch length Stitches are puckered Decrease the pressure The presser foot pressure should be as weak as possible but strong enough so that the material does not slip Refer to Adjusting screw height in the table below as a 2 os Becomes stronger guide to adjustment 18mm 47mm 1 Loosen the adjusting nut 1 Becomes weaker 2 Turn the presser adjusting screw 2 to adjust the presser foot pressure 3 Tighten the adjusting nut 1 Reference values Use Adjusting screw height For foundation Approx 34mm For light weight and medium weight Approx 34mm materials For heavy weight Approx 29mm materials 8 3 Adjusting the trailing length after thread trimming Models with thread trimmer only e At the time of thread trimming the thread tension is loosened and tension is applied by the pretension 1 only e The standard trailing length for the upper thread is 33 37 mm e If the tension of the pretension 1 is increased the a lengths of the threads trailing from the needle tips will be di N Shorter reduced if the tension is reduced the lengths will be increased Adjust by turning the pretension 1 r 6 i ae Trailing thread T 8421A 8422A 8452A 8722A 8752A 36 8 THREAD TENSION 8 4 Adjusting the thread take up amount l
28. d parts Is the thread path damaged If the thread path is damaged smooth it with sandpaper or replace the damaged part Is the thread take up amount correct Adjust the thread take up amount 16 18 22 35 38 37 10 Incorrect thread trimming Is the movable knife damaged or bent Replace the movable knife 11 Broken needles SAZ a SX 0469M Is the material being pushed or pulled with excessive force during sewing Is the needle bent is the needle tip broken or is the needle hole blocked Replace the needle Does the needle drop into the center of the needle hole in the feed dog Check the needle drop position If the needle does not drop into the center of the needle hole in the feed dog reinstall the feed dog If the needle bar has rotated rotate the needle bar to the correct position Caution It is extremely dangerous to leave any pieces of broken needle sticking in the material If the needle breaks search for all pieces until the whole of the needle is found again Furthermore we recommend we recommend that through steps be taken to account for such needles to comply with product liability regulations 16 12 Machine does not operate when power is turned on and treadle is pressed Is the power supply connector disconnected from the control box Insert the securely connector 2952M 13 47 T 8421A 8422A 8452A 8722A 8752
29. ding on the type of material being sewn In such cases replace the presser foot with one that has slots on the underside or replace the feed dog with a grooved feed dog O Grooves 0574M 0573M 2 Loops appear in seam e Is the thread path not smooth enough Use a file with a fine grain or sandpaper to polish smooth the thread path ho Ul Ue Ul TA G e Is the bobbin not turning smoothly IKS KSS KSK i JLLS Pull out the lower thread to check that there is no slackness in the thread tension or replace the bobbin or bobbin case e Is the thread take up amount too large Adjust the thread take up amount 37 0977M T 8421A 8422A 8452A 8722A 8752A 44 11 TROUBLESHOOTING Skipped stitches while sewing occur 2945M e Is the needle tip bent Is the needle tip blunt If the needle tip is bent or broken replace the needle e ls the needle properly installed If it is incorrect install the needle correctly e Is the machine properly threaded If it is incorrect thread the thread correctly e ls the presser foot pressure too weak Adjust the presser foot pressure e Is the needle too thin Replace the needle with a needle that is one rank thicker e Is the presser foot too high Adjust the height of the presser foot e ls the thread take up spring too weak Adjust the tension of the thread take up spring e Is the thread take up amount
30. e from the sewing machine e The sewing machine should be plugged directly into an AC wall outlet Operation problems may result if extension cords are used 2086M Carrying the machine e The machine should be carried by the arm by two people as shown in the illustration Hold the motor cover A by hand also so that the pulley does not rotate OF a 2870M Tilting back the machine head e Hold section B with your foot so that the table does not move and then push the arm with both hands to tilt back the machine head 2871M Returning the machine head to the upright position 1 Clear away any tools etc which may be near the table holes 2 While holding the face plate with your left hand gently return the machine head to the upright position with your right hand T 8421A 8422A 8452A 8722A 8752A 4 3 INSTALLATION 3 1 Table processing diagram e The top of the table should be 40 mm in thickness and should be strong enough to hold the weight and with stand the vibration of the sewing machine e Drill holes as indicated in the illustration below Cotton stand hole Cord hole Head rest hole Control box mounting hole 3 2 Installation 1 Control box 1 Control box 2 Bolts 3 pcs 3 Nuts 3 pcs 4 Spring washers 3 pcs 5 Washers 3 pcs 2 Connecting rod 6 Connecting rod 7 Nut 5 T 8421A 8422A 8452A 8722A 8752A 3 INSTALLATION
31. e lever 2 is pressed during sewing the feed direction will be reversed When it is released the feed direction will return to normal lt Actuator rotation function gt The actuator can be rotated 90 degrees as shown in the illustration Select the position A or B that is easier to use 33 T 8421A 8422A 8452A 8722A 8752A 7 SEWING 7 3 Sewing condensed stitches e If you press the actuator 1 or the reverse lever 2 while sewing is in progress you can sew stitches forward direction with small stitch lengths e Before carrying out sewing set the stitch length for condensed stitches as follows l Sewing direction i Condensed stitches 2919M lt Setting gt 1 Unlock the stitch length dial 4 by turning the dial lock lever 3 to the right 2 Turn the stitch length dial 4 to the stitch length to be used for condensed stitches 3 Loosen the screw 5 and lift up the stopper 6 until it touches the reverse stitching lever plate 7 4 Tighten the screw 5 to secure the stopper 6 lt Sewing gt 1 Return the stitch length dial 4 to the stitch length for normal sewing 2 Turn the dial lock lever 3 firmly to the left to lock the stitch length dial 4 3 Start sewing 4 At the position where you would like to start sewing condensed stitches press the actuator 1 or the reverse lever 2 Condensed stitches are sewn while the actuator 1 or reverse lever 2 is be
32. e may result 4 9 1 To stop the needle bars right and left Operate the stop lever after the needle has penetrated the material and has stopped moving e Do not sew at speeds of over 1 000 rpm while one of the needle bars has been stopped lt To stop operation of the left needle bar gt Move the stop lever 1 to the L position lt To stop operation of the right needle bar gt Move the stop lever 1 to the R position 5 X DAN lt To resume twin needle sewing gt Press the push lever 2 The stop lever 1 will then return to its original position automatically Y 4 9 2 Number of stitches quick reference guide N 3131M Sewing No of Nangle 30 40 50 60 70 80 90 100 110 120 130 140 Stitches 2 46 38 32 27 22 18 15 1 1 3 46 3 5 3 0 25 2 1 18 15 1 2 4 44 34 28 23 19 16 13 ict te AE Fhe 40S 5 48 35 27 22 18 15 13 2 Ree 6 4 0 23 19 15 13 7 37 25 20 1 6 No of stitches 6 8 3 0 2 2 1 7 lt For 1 4 needle width gt Determine the stitch length from the chart above to make beautiful corner stitching The number of stitches of the outer needle varies according to the combination of sewing angle and stitch length Example For a sewing angle of 40 and a stitch length of 2 9 mm the number of stitches becomes 6
33. er dealer or a qualified technician If the machine develops a problem contact your nearest Brother dealer or a qualified technician Be sure to wear protective goggles and gloves when handling the lubricating oil and grease so that they do not get into your eyes or onto your skin otherwise inflammation can result Furthermore do not drink the oil or eat the grease under any circumstances as they can cause vomiting and diarrhea Keep the oil out of the reach of children Use only the proper replacement parts as specified by Brother T 8421A 8422A 8452A 8722A 8752A 3 Warning labels The following warning labels appear on the sewing machine Please follow the instructions on the labels at all times when using the machine If the labels have been removed or are difficult to read please contact your nearest Brother dealer A e BSLRACSNT AMET S i SEs SSMS CERHS BRED SOT E ERSA DdBAN EEF TCE AAR mS ADANGER AGEFAHR ADANGER APELIGRO Hazardous voltage Hochspannung i Un voltage non adapte Un voltaje inadecuado will cause injury verletzungsgefahr rovoque des blessures puede provocar las VE Lt ae Turn off aih ih Bitte schalten sie den 2209 p p RAN D ER o hauptschalter aus und Eteindre l interrupteur et heridas Apagar el FUE ae ER Ran ae B and wait 5minutes fWwarten sie 5 minuten attendre 5 minutes avant interruptor principal y before opening this bevor sie diese d ouvrir le capot e
34. er the sewing machine has been used for approximately two hours Too much Correct Too little 43 T 8421A 8422A 8452A 8722A 8752A 11 TROUBLESHOOTING 11 TROUBLESHOOTING e Please check the following points before calling for repairs or service e If the following remedies do not fix the problem turn off the power switch and consult a qualified technician or the place of purchase DANGER Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet before opening the face plate of the control box Touching areas where high voltages are present can result in severe injury CAUTION Turn off the power switch and disconnect the power cord before carrying out troubleshooting The machine may operate if the treadle is depressed by mistake which could result in injury 11 1 Sewing Items with a in the Page column should only be checked by a qualified technician Problem Possible cause Page 1 Upper thread is not tight e Has the thread been threaded incorrectly If the thread is threaded incorrectly thread it correctly 18 22 e ls the upper thread tension or lower thread tension too weak Adjust the upper thread tension or lower thread tension 35 e ls the thread take up spring operating range too small Lower the position of the stopper If using a sewing machine with medium weight material specifications poor thread tightening may occur depen
35. follow this term indicate situations where failure to follow the A CAUTION instructions could cause injury when using the machine or physical damage to equipment and surroundings Symbols A she eats This symbol indicates something that you should be careful of The picture inside the triangle indicates the nature of the caution that must be taken For example the symbol at left means beware of injury S ae This symbol Q indicates something that you must not do A NTEN This symbol indicates something that you must do The picture inside the circle indicates the nature of the thing that must be done For example the symbol at left means you must make the ground connection T 8421A 8422A 8452A 8722A 8752A i 2 Notes on safety A DANGER Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet before opening the face plate of the control box Touching areas where high voltages are present can result in severe injury CAUTION Environmental requirements o Use the sewing machine in an area which is free from sources of strong electrical noise such as electrical line noise or static electric noise Sources of strong electrical noise may cause problems with correct operation Any fluctuations in the power supply voltage should be within 10 of the rated voltage for the machine Voltage fluctuations which are greate
36. hat has been set by the needle up down key refer to p 26 After vo gt this normal sewing is carried out if the treadle is depressed e After the treadle is depressed backward the thread is trimmed models with thread trimmer ay and the sewing machine switches to fixed stitch sewing mode Na O lt Automatic thread trimming Models with thread trimmer only gt r gt Press the thread trimming key to turn on the thread trimming function When the treadle is 2159M 2160M continuously depressed thread trimming is carried out after the fixed stitches have been sewn lt Automatic sewing gt When the AUTO key is pressed to turn on the automatic sewing function the fixed stitches are sewn simply by depressing the treadle once without needing to depress it continuously lt Start and end backtack sewing gt e The start backtack key and end backtack key can be pressed to turn on the backtack sewing function e f changing the number of end backtack stitches in C and D press the fixed stitch key to temporarily turn off the fixed stitch function before making the change The CD display will show the number of stitches and the setting can then be changed ag T 8421A 8422A 8452A 8722A 8752A 28 5 USING THE OPERATION PANEL BASIC OPERATIONS 5 4 Using the lower thread counter e The lower thread counter can be used to let you know approximately how much lower thread is remaining e The value di
37. hen sewing with a stitch length of 2 mm or less When sewing under any of the above three conditions and you would like to prevent skipped stitches thread tightening problems such as looping or thread breakages T 8421A 8422A 8452A 8722A 8752A 9 CLEANING 9 CLEANING CAUTION A A 9 1 Daily cleaning procedures Turn off the power switch before carrying out cleaning The machine may operate if the treadle is depressed by mistake which could result in injury Keep the oil out of the reach of children Be sure to wear protective goggles and gloves when handling the lubricating oil and grease so that they do not get into your eyes or onto your skin otherwise inflammation can result Furthermore do not drink the oil or eat the grease under any circumstances as they can cause vomiting and Use both hands to hold the machine head when tilting it back or returning it to its original position If only one hand is used the weight of the machine head may cause your hand to slip and your hand may get caught The following cleaning operations should be carried out each day in order to maintain the performance of this machine and to ensure a long service life Furthermore if the sewing machine has not been used for a long period of time carry out the following cleaning procedures before using it again lt Cleaning gt 1 Turn the machine pulley to move the needle to the needle up stop position Open
38. ight until a click is heard 2 Turn the stitch length dial 2 clockwise or counterclockwise so that the desired stitch length is at the uppermost position on the dial The larger the number the longer the stitch length will be The numbers on the dial are for use as a guide The length of the finished stitches may vary depending on the type and thickness of material being sewn Adjust while looking at the finished stitches e When turning the stitch length dial 2 from a larger setting to a smaller setting it will be easier to turn the dial if the reverse lever 3 is pushed to the halfwaydown position 3 Turn the dial lock lever 1 firmly to the left to lock the stitch length dial 2 Check that the stitch length dial 2 does not rotate YN we DO Locked NN Unlocked The presser foot 2 can be raised by pressing the knee lifter plate 1 he 2907M 4 8 Using the thread wiper Models with thread trimmer only Press the thread wiper switch 1 to the side After thread trimming is carried out the thread wiper 2 will pull up the thread 2209M 23 T 8421A 8422A 8452A 8722A 8752A 4 PREPARATION BEFORE SEWING 4 9 Corner sewing method T 8452A 8752A NOTE If using this machine in place of a single needle machine remove the needle which is not being used In such cases do not use the procedures given below to stop the unused needle bar from moving otherwise damage to the machin
39. ing i continuously for 3 minutes or more Over time Turn the power switch off and then back on again and then operate the sewing machine normally Err 13 Is the treadle unit connector inside the control l box disconnected Treadle unit Insert the connector securely ij error Err 21 ee inside the control box Thermistor error Insert the connector securely j 3159M Err 100 This appears on the display when the sewing machine has continued to be used for a certain period after the GREASEUP notification appears without the grease GrEASEUP being applied without the reset procedure being carried out io Apply grease and then carry out the reset procedure Err 101 diP SW4 Is DIP switch No 4 inside the control box set to ON Set DIP switch No 4 to OFF 3160M If an error code that is not listed above appears contact the place of purchase T 8421A 8422A 8452A 8722A 8752A 50 INSTRUCTION MANUAL BROTHER INDUSTRIES LTD http www brother com 15 1 Naeshiro cho Mizuho ku Nagoya 467 8561 Japan Phone 81 52 824 2177 Printed in Japan T 8421A 8422A 8452A 8722A 8752A SA2698 301 2005 04 B 1
40. ing pressed Locked Unlocked To stop sewing condense stitches and return to using the backtack function lower the stopper 6 so that it does not touch the reverse stitching lever plate 7 T 8421A 8422A 8452A 8722A 8752A 34 8 THREAD TENSION 8 THREAD TENSION 8 1 Adjusting the thread tension Good even stitches WW 7 Upper thread XN lt Lower thread SS 0572M Upper thread tension too weak or Increase the upper thread tension lower thread tension too strong Decrease the lower thread tension Upper thread tension too strong Decrease the upper thread tension or lower thread tension too weak Increase the lower thread tension lt Lower thread tension gt CAUTION A Turn off the power switch before adjusting the lt Latch type gt lower thread tension The machine may operate if the treadle is depressed by mistake which could result in injury Turn the adjusting screw 1 to adjust Becomes weaker A Becomes stronger lt Bobbin case type gt 1 Becomes stronger aa Becomes weaker lt Upper thread tension gt After the lower thread tension has been adjusted adjust the upper thread tension so that a good even stitch is obtained 1 Lower the presser foot 2 Adjust by turning the tension nut 2 4 e weaker 35 T 8421A 8422A 8452A 8722A 8752A 8 THREAD TENSION 8 2 Adjusting the presser foot pressure Corre
41. ing the thread wiper Models with thread trimmer only 0 23 4 9 Corner sewing method T 8452A 8752A 24 5 USING THE OPERATION PANEL BASIC OPERATIONS seeeees 25 5 1 Names and functions n 25 5 2 Sewing start and end backtack stitches 27 5 3 Sewing fixed stitches ec eeeeeeeeeeeeees 28 5 4 Using the lower thread counter 0 000 29 6 USING THE OPERATION PANEL ADVANCED OPERATIONS 30 6 1 Names and functions ee eeeeeeeeeeenees 30 6 2 Adjusting the needle up stop position 31 6 3 LOCK Key viuatiosevis ese cereraneteidinees eigenen 31 6 4 Resetting all settings to their defaults 31 Aes SEWING 2503525555 ssn 2cxbacnctinauanaaccqnecdcemsanas 32 721 SOWING erirken E iat Os lee Ae 32 T A BACktaCKing iets icccssteias EEE AE 33 7 3 Sewing condensed stitches 1 00 34 8 THREAD TENSION sseeeeeeees 35 8 1 Adjusting the thread tension c eee 35 8 2 Adjusting the presser foot pressure 36 8 3 Adjusting the trailing length after thread trimming Models with thread trimmer only 36 8 4 Adjusting the thread take up amount 37 9 CLEANING sasreecteeieeei ence 38 9 1 Daily cleaning procedures n 38 9 2 Lubricating via the oil cover every 6 MONS ee eeeeeeeeeeettteeeeeeeeaes 39 9 3 Applying grease When GREASEUP appears Semi dry specifi
42. lifter 7 is approximately 2 mm when the knee lifter plate 1 is gently pressed Securely tighten the nut 6 Loosen the nut 9 Turn the screw 10 until the distance between the end of the screw 10 and the knee lifter 7 is approximately 5 mm Turn the adjusting screw 10 to adjust so that the presser foot 5 is at the desired position within a distance of 13 mm of the needle plate when the knee liter plate 1 is fully pressed After adjustment is completed securely tighten the nut 9 Within 13 mm T 8421A 8422A 8452A 8722A 8752A 8 3 INSTALLATION 3 3 Lubrication A CAUTION Do not connect the power cord until lubrication has been completed otherwise the machine may operate if the treadle is depressed by mistake which could result in injury Be sure to wear protective goggles and gloves when handling the lubricating oil and grease so that they do not get into your eyes or onto your skin otherwise inflammation can result Furthermore do not drink the oil or eat the grease under any circumstances as they can cause vomiting and diarrhea Keep the oil out of the reach of children e The sewing machine should always be lubricated and the oil supply replenished before it is used for the first time and also after long periods of non use e Use only the lubricating oil Nisseki Mitsubishi Sewing Lube 10N VG10 specified by Brother If this type of lubricating oil is difficult to obtain
43. mode AL C D 3 Press and hold the LOCK key 3 for 2 seconds or more WEE aHa HA il The lock icon 4 will switch off and the lock will be released 4 Press the FUNC Function key 5 n 134 xxx will appear in green in the main display 1 xxx represents the time between grease applications 5 Press the rightmost V key 6 The xxx will change to 0 6 Press and hold the ENTER key 7 for two seconds or more The buzzer will make a long beep and then the main display 1 will change to stitch number display mode 5 7 3 7 Depress the treadle to run the sewing machine for 1 second or more 8 Turn the power switch to OFF This completes the reset procedure asof e o 2139M T 8421A 8422A 8452A 8722A 8752A 42 10 ADJUSTING THE ROTARY HOOK LUBRICATION AMOUNT 10 ADJUSTING THE ROTARY HOOK LUBRICATION AMOUNT CAUTION Be careful not to touch your fingers or the lubrication amount check sheet against moving parts such as the rotary hook or the feed mechanism when checking the amount of oil supplied to the rotary hook otherwise injury may result Use the following procedure to check the amount of oil being supplied to the rotary hook when replacing the rotary hook or when changing the sewing speed lt Guide to lubrication adjustment gt 1 Tilt back the machine head 2 Turn the oil adjusting screw 1 to adjust the height to within 9 14 mm l
44. onnection is not secure you run a high risk of receiving a serious electric shock and problems with correct operation may also occur 9S Q A S When securing the cords do not bend the cords excessively or fasten them too hard with staples otherwise there is the danger that fire or electric shocks could occur If using a work table which has casters the casters should be secured in such a way so that they cannot move Use both hands to hold the machine head when tilting it back or returning it to its original position If only one hand is used the weight of the machine head may cause your hand to slip and your hand may get caught Be sure to wear protective goggles and gloves when handling the lubricating oil and grease so that they do not get into your eyes or onto your skin otherwise inflammation can result Furthermore do not drink the oil or eat the grease under any circumstances as they can cause vomiting and diarrhea Keep the oil out of the reach of children T 8421A 8422A 8452A 8722A 8752A CAUTION Sewing This sewing machine should only be used by operators who have received the necessary training in safe use beforehand The sewing machine should not be used for any applications other than sewing Be sure to wear protective goggles when using the machine If goggles are not worn there is the danger that if a needle breaks parts of the broken needle may enter your eyes and injury
45. r than this may cause problems with correct operation The power supply capacity should be greater than the requirements for the sewing machine s power consumption Insufficient power supply capacity may cause problems with correct operation B Q Q The ambient temperature should be within the range of 5 C to 35 C during use Temperatures which are lower or higher than this may cause problems with correct operation The relative humidity should be within the range of 45 to 85 during use and no dew formation should occur in any devices Excessively dry or humid environments and dew formation may cause problems with correct operation In the event of an electrical storm turn off the power and disconnect the power cord from the wall outlet Lightning may cause problems with correct operation Installation Machine installation should only be carried out by a qualified technician Contact your Brother dealer or a qualified electrician for any electrical work that may need to be done The sewing machine weighs approximately 50 kg The installation should be carried out by two or more people Do not connent the power cord until installation is complete The machine may operate if the treadle is depressed by mistake which could result in injury Turn off the power switch before inserting or removing the plug otherwise damage to the control box could result Be sure to connect the ground If the ground c
46. read wound onto the bobbin 80 The bobbin winding amount should not be more that 80 Is the anti spin spring attached Models with thread trimmer Attach the anti spin spring Is the bobbin turning smoothly If the bobbin is not turning smoothly replace the bobbin Is a bobbin other that the light alloy bobbins specified by Brother being used Use only bobbins which are specified by Brother 2124M 19 18 19 20 19 20 T 8421A 8422A 8452A 8722A 8752A 46 11 TROUBLESHOOTING Problem Possible cause Page Upper and lower threads are breaking 0471M Is the needle bent or is the needle tip broken Replace the needle if it is bent or broken Is the needle properly installed If it is incorrect install the needle correctly Is the machine properly threaded If it is incorrect thread the thread correctly Is the oil tank filled with lubricating oil If the level of lubricating oil is below the bottom reference line add more oil Is the upper or lower thread tension too weak or too strong Adjust the upper thread or lower thread tension Is the rotary hook blocked with dust or thread scraps Clean the rotary hook Is the upper thread may be loose because the thread take up spring operating range is too small Adjust the position of the stopper Is the rotary hook feed dog or other part damaged If they are damaged smooth them with an oiled grindstone or replace the damage
47. sperar 5 minutos antes Bik THe EE RA cover abdeckung ffnen de abrir esta cubierta it TE iR BRS LST Fh HW THe A CAUTION Moving parts may cause injury Operate with safety devices Turn off main switch before threading changing bobbin and needle cleaning etc 3 Be sure to connect the ground If the ground connection is not Safety devices secure you run a high risk of receiving a serious electric shock and problems with correct operation may also occur A Finger guard B Thread take up cover Direction of operation Control box T 8421A 8422A 8452A 8722A 8752A CONTENTS 1 MACHINE SPECIFICATIONS 1 2 NAMES OF MAJOR PARTS 06 3 3 INSTALLATION cccccceeeeeeeeeeeeeeeeeees 4 3 1 Table processing diagram 5 3 2 INStAllAtiON iaasa aai i a 5 3 3 LUDNCAION aa E E E TE A 9 3 4 Connecting the cordS n 11 3 4 1 Opening the control box cover 11 3 4 2 Connecting the cords cee 11 3 5 Test operation Operating the treadle 15 4 PREPARATION BEFORE SEWING 16 4 1 Installing the needle cee eeeeeeeeeentteeeeeeeee 16 4 2 Removing the bobbin s es 17 4 3 Winding the lower thread ceeeeeeeerree 18 4 4 Installing the bobbin n 19 4 5 Threading the upper thread 0 00 21 4 6 Adjusting the stitch length 0 eee 23 4 7 Using the knee lifter ee eeeeeeeeeenee 23 4 8 Us
48. splayed by the lower thread counter display is reduced by 1 from the initial setting value each time the sewing machine sews 10 stitches and a warning is given when the counter reaches 5 lt Initial value setting gt 1 After about 2 seconds the buzzer will sound and the lower thread counter display will show the initial value which was set previously wn gt 2166M Press for 2 seconds or more When the A key is pressed the setting increases When the W key is pressed the setting decreases If you hold down the keys the setting will change more quickly If a value of O is set the lower thread counter will not operate The initial setting value will be accepted when sewing starts 2167M 2168M 2169M lt Lower thread counter operation gt Reduces by 1 for every 10 1 Press the stitches sewn ___ RESET key 2 Ia 999 Initial value ea Press the RESET key 2 for 2 seconds or more 1 When sewing is carried out the value shown in the lower thread counter display is reduced by 1 for every 10 stitches sewn After the value reaches zero 0 a minus sign appears and counting continues to a maximum of 999 2 When the value is 5 or less a warning icon 1 illuminates and an electronic buzzer sounds for 5 seconds 3 After the treadle returns to the neutral position and the sewing machine stops the sewing machine will not start up again
49. t Press the ON power switch 1 The power indicator 2 and 3 will illuminate NOTE When turning the power switch on for the first time The treadle and the operation panel will not operate for approximately four seconds after the power switch is turned on After approximately 4 seconds iniT rPM speed initialization or iniT ALL full initialization will be displayed on the operation panel After iniT rPM or iniT ALL is displayed the treadle can be operated The operation panel will change to the stitch number display This message will not appear the second and subsequent times that the power switch is turned on lt Test operation gt 1 2 3 Check that the machine sews at low speed when the treadle 4 is gently pressed to position B Then check that it sews at high speed when the treadle 4 is gently pressed to position C After pressing the treadle 4 forward check that the needle is lowered to the top of the needle plate when the treadle 4 is returned to the neutral position A when needle down stopping has been set If the treadle 4 is pressed to position D thread trimming is carried out for models with thread trimmer and the needle rises above the needle plate and stops T 8421A 8422A 8452A 8722A 8752A 4 PREPARATION BEFORE SEWING 4 PREPARATION BEFORE SEWING 4 1 Installing the needle A CAUTION Turn off the power switch before installing the
50. t Checking the lubrication amount gt 1 Turn off the power switch 2 Remove the thread from all points from the thread take up to the needle 3 Remove the needle and the bobbin 4 Use the lifting lever to lift the presser foot 5 Turn on the power switch 6 Run the machine at the normal sewing speed for approximately 1 minute without sewing any material following the same start stop pattern as when actually sewing 7 Place the lubrication amount check sheet 2 to the left of the rotary hook the right side is the right side of the rotary hook and hold it in place while running the sewing machine at the normal sewing speed for approximately 8 seconds Any type of paper can be used as the lubrication amount check sheet 2 Spattered oil 8 Check the amount of oil which has spattered onto the sheet lt Adjusting the lubrication amount gt 1 Tilt back the machine head 2 Turn the adjusting screw 1 to adjust the lubrication amount If the rotary hook adjusting screw 1 is turned counterclockwise the lubrication amount becomes greater If the rotary hook adjusting screw 1 is turned clockwise the lubrication amount becomes smaller 3 Check the lubrication amount again according to the procedure given in Checking the lubrication amount above Turn the adjusting screw 1 and check the lubrication amount repeatedly until the lubrication amount is correct 4 Check the lubrication amount again aft
51. t For all models except foundation specifications and T 8452A 405 gt Do not pass the thread through lt For foundation specifications and T 8452A 405 gt Center Pass the thread through 37 The thread take up amount is adjusted by how the thread is passed through the thread amount adjuster 1 lt Using the standard thread amount adjuster 1 gt For all models except foundation specifications and T 8452A 405 Do not pass the thread through the thread amount adjuster 1 Loosen the screw 2 and slide the thread amount adjuster 1 to the right side position For foundation specifications and T 8452A 405 Pass the thread through the thread amount adjuster 1 The standard position of the thread amount adjuster 1 is when the screw 2 is in the center of the adjustment range lt Adjusting the thread take up amount gt When the thread has been passed through the thread amount adjuster 1 the thread take up amount becomes less when the thread amount adjuster 1 is moved to the right It is better not to pass the thread through the thread amount adjuster 1 When sewing heavy materials using a sewing machine with foundation specifications When the thread take up amount is not enough such as when the stitch length is increased It is better to pass the thread through the thread amount adjuster 1 When sewing with slippery threads such as synthetic yarns When sewing light materials W
52. t from the control box should be secured to the cord holder 3 using the repeat cable tie 1 otherwise vibration from the sewing machine may cause the cords to become disconnected which can cause problems with the operation of the control box 12 3 INSTALLATION 2800M 3 Other cords 1 6 pin power supply connector 2 4 pin motor connector 3 Wire clip 4 Power cord lt For single phase specifications gt Insert the power cord plug 5 into a wall outlet 2 lt For three phase specifications gt 2 1 Attach an appropriate plug to the Sees power cord 4 The green and yellow wire is the ground wire 2 Insert the plug into a properly grounded AC power supply lt Single phase gt NOTE Do not use extension cords z otherwise machine operation Sesame S problems may result 5 Green and yellow wire ground wire 13 T 8421A 8422A 8452A 8722A 8752A T 8421A 8422A 8452A 8722A 8752A 3 INSTALLATION 4 Ground wire 1 Ground wire 2 Screw With washer 3 Screw NOTE Always be sure to connect the ground wire 1 otherwise problems may occur with sewing machine operation 14 3 INSTALLATION 3 5 Test operation Operating the treadle A CAUTION 15 Do not touch any of the moving parts or press any objects against the machine while sewing as this may result in personal injury or damage to the machine lt Turning on the power g
53. th of approximately 50 mm 6 Close the slide plates e There is an anti spin spring 6 inside the rotary hook The anti spin spring 6 prevents the bobbin from racing at times such as during thread trimming e Use bobbins 1 made of light alloy as specified by BROTHER 19 T 8421A 8422A 8452A 8722A 8752A 4 PREPARATION BEFORE SEWING lt Bobbin case type gt 1 Insert the bobbin 1 into the bobbin case 2 so that the winding direction is as shown in the illustration 2 There are three types of cap 2 lt A gt lt B gt and lt C gt Thread the thread by one of the following methods in accordance with the shape of the bobbin case 2 being used lt A gt 1 Pass the thread through slot 3 and under the thread tension spring 4 2 Pass the thread through the thread hole 8 and pull out about 50 mm lt B gt lt C gt 1 Pass the thread through slot 3 and under the thread tension spring 4 2 Pass the thread through slots 5 and 6 and then through the spring 7 3 Pass the thread through the thread hole 8 and pull out about 50 mm Insert the bobbin case 2 into the rotary hook Push latch 9 of the rotary hook flat Close the slide plates oR e There is an anti spin spring 10 inside the rotary hook The anti spin spring 10 prevents the bobbin from racing at times such as during thread trimming e Use bobbins 1 made of light alloy as specified by BROTHER T 84
54. times around the bobbin 1 in the direction indicated by the arrow Check that the thread is not loose anywhere along the thread path Push the bobbin presser arm 3 toward the bobbin 1 Raise the presser foot with the lifting lever Depress the treadle Lower thread winding will then start Once winding of the lower thread is completed the bobbin presser arm 3 will return automatically After the thread has been wound on remove the bobbin and cut the thread with the knife 4 NOOK oO o0 Loosen the screw 5 and move the bobbin presser 6 to adjust the amount of thread wound onto the bobbin NOTE The amount of thread wound onto the bobbin should be a maximum of 80 of the bobbin capacity Less thread T 8421A 8422A 8452A 8722A 8752A 18 4 PREPARATION BEFORE SEWING 4 4 Installing the bobbin CAUTION Turn off the power switch before installing the bobbin The machine may operate if the treadle is depressed by mistake which could result in injury lt Latch type gt 1 Insert the bobbin 1 into the rotary hook 2 so that the winding direction is as shown in the illustration 2 Return the rotary hook latch 3 to its original position 3 Turn the machine pulley to rotate the rotary hook 2 until the tension spring 4 is visible 4 Pass the thread through slit 5 in the rotary hook and then pass it under the thread tension spring 5 Pull out the thread to a leng
55. will decrease e2 down to 10 and the needle up stop position will become higher 4 Press the ENTER key 4 for two seconds or more oO A long buzzer will sound and the main display 2 will 2 2 change to stitch number display mode This completes nl gt the needle up stop position setting 1 8 4 A setting value of 10 corresponds to an angle of rotation f of approximately 10 for the upper shaft Becomes higher Becomes lower 2913M 2138M 2139M 6 3 LOCK key When the power switch is turned on the LOCK key 1 turns ON The icon 2 is illuminated In this state the following three key operations are invalid so that setting values cannot be changed accidentally FUNC key 3 This key is used to make settings for various functions ENTER key 4 This key is used to accept function settings MAX key 5 This key is used to change the maximum sewing speed Refer to the Service Manual for details on using these keys 6 4 Resetting all settings to their defaults While holding down the RESET key turn on the power switch If you press the ENTER key the settings will then be reset Once the settings have been reset iniT ALL appears in the display and the operation panel settings are reset to their factory default settings Once the above display appears normal operation will then be possible 31 T 8421A 8422A 8452A 8722A 8752A 7 SEWING 7 SEWING A CAUTION

Brother T-8422A Instruction manual

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