Brother PS-53, Service Manual

Page 1: ... 7 2001 www promelectroavtomat ru ...

Page 2: ...S57 PS55 PS53 1 Use the operation procedure given in this document 2 Always disconnect the power cord from the socket before starting to install or remove any parts 3 Always replace only with genuine Brother parts 4 Do not alter this sewing machine Doing so can cause fire electrical shock injury etc STAR240E STAR230E 5 Always use rubber gloves when handling printed circuit boards and never touch t...

Page 3: ...3 3 ELECTRONIC PARTS ARRANGEMENT CHART STAR240E STAR230E only 6 4 CONTROL SYSTEM BLOCK DIAGRAM STAR240E STAR230E only 7 5 MOTOR UNIT CONTROL STAR240E STAR230E only 7 6 OTHER ELECTRONIC COMPONENT FUNCTIONS STAR240E STAR230E only 7 www promelectroavtomat ru ...

Page 4: ... 2 1 MECHANICAL CHART www promelectroavtomat ru ...

Page 5: ...ake up lever and zigzag movements Thread take up lever Thread take up crank Worm gear Timing pulley Needle bar crank rod Needle bar clamp Needle bar Needle bar block assembly Needle Pattern cam Zigzag connecting rod Z finger Selecting cam Upper shaft www promelectroavtomat ru ...

Page 6: ...ed carriage Vertical feed cam Horizontal feed plate Feed pattern cam Feed finger Feed regulator Horizontal feed shaft Horizontal feed cam pulley Forked connecting rod Horizontal feed arm Lower shaft Timing belt Lower shaft timing belt Worm gear Timing pulley Driving belt Motor www promelectroavtomat ru ...

Page 7: ...TAR240E STAR230E PS57 PS55 PS53 is not necessary because of 4 step BH mechanism BH change shaft BH change arm BH stopper BH cam BHF finger assembly BH Iever BH foot Feed control cam BH BHF finger assembly 2 A 2 B www promelectroavtomat ru ...

Page 8: ... 6 3 ELECTRONIC PARTS ARRANGEMENT CHART STAR240E STAR230E only www promelectroavtomat ru ...

Page 9: ...owever when the foot controller is used the speed does not become slow speed Speed adjustment volume a slide control used to set the sewing machine rotation rate Needle position NP sensor detects the drive timing of zigzag and feed pulse motors and detects the Rotation Sensor vertical position of the needle Also detects the turning angle of the upper shaft by means of a photointerruptor and shutte...

Page 10: ... 8 II 1 DISASSEMBLING AND REASSEMBLING THE OUTER PARTS AND MAIN PARTS 9 2 LEAD WIRES ARRANGEMENT 29 3 MAIN PC BOARD ASSEMBLY REMOVAL STAR240E STAR230E Only 30 www promelectroavtomat ru ...

Page 11: ...nt by sliding it to the left 3 Remove the six screws holding the front cover three on the rear two on the bottom one of the left then lift up the front cover from the bottom side open it forward and remove it 4 Lower the presser lifter remove the four screws holding the rear cover two on front one on rear and one on bottom and then remove the rear cover Remove the handle too www promelectroavtomat...

Page 12: ...ng machine remove the 3 pin socket folder and then remove the three wiring harness bands for the lamp cord 6 Remove the screws holding the cord clamp 7 Remove the two screws holding the motor holder then remove the motor The driving belt can be removed too Disassembly Point STAR240E STAR230E only When removing a lead connector hold it by the connector shell Pulling on the lead wire instead of the ...

Page 13: ...rod remove the screws holding the Zigzag connecting rod adjustment nut and remove the Zigzag connecting rod 11 Remove the lock ring and the screw then remove reverse sewing lever A 12 Remove the tension spring for reverse sewing lever B then remove reverse sewing lever B 13 Remove the feed regulator tension spring 14 Remove the two screws holding the feed bracket assembly then remove the feed brac...

Page 14: ...e bar block assembly 18 Remove the screws holding the needle bar supporter stud holder assembly then remove the needle bar supporter stud holder assembly 19 Remove the needle bar block assembly then remove the setscrew and lock nut Disassembly Point 19 Turn the needle bar block assembly slightly to the left side then pull it forward to remove it Needle threader is not used for PS53 www promelectro...

Page 15: ...ve the BH lever installation plate At the same time remove the torsion spring 21 Loosen the presser bar clamp screw take out the presser bar and then remove the presser bar clamp and presser spring 22 Take the presser lifting shaft from the arm then remove the presser lifter Disassembly Point 22 Lifting up the presser lifter makes it easier to remove the presser bar Be careful not to let the press...

Page 16: ... thread take up crank set screw then remove the needle bar crank and the needle bar crank rod Disassembly Point 24 Remove the left thread take up lever screw by holding the balance wheel by hand so that the upper shaft does not turn and turning the screwdriver to the right 25 Loosen the thread take up crank set screw by holding the balance wheel by hand so that the upper shaft does not turn www pr...

Page 17: ...evention bracket then remove the inner rotary hook rotation prevention bracket 28 Remove the screw holding the inner rotary hook left retainer plate then remove the inner rotary hook left retainer plate 29 Remove the two screws holding the camber prevention plate then remove the camber prevention plate 30 Remove the feed base tension spring www promelectroavtomat ru ...

Page 18: ...enter left then remove the horizontal feed shaft assembly 33 Remove the forked connecting rod 34 Loosen the rotary hook shaft set screw then remove the rotary hook assembly rotary hook shaft and three washers 35 Remove the screw holding the tension pulley assembly then remove the tension pulley assembly 36 Remove the screw holding the eccentric metal presser and the screw holding the lower shaft m...

Page 19: ...spring are not used for PS53 40 Remove the three screws securing the selection unit then remove the selection unit 41 Remove the M4 hex screw 42 Remove the screw securing the presser plate then remove the selection dial assembly 43 Remove the CS lock ring then remove the torsion spring and the thread slack plate C 44 Remove the three bottom leg rubber pads 45 Remove the leg adjustment screws Disas...

Page 20: ...gulator shaft and plastic washer A then secure with the fastening plate and screws Assembly Points 48 After installing the thread slack plate C rotate it and check that the force of the torsion spring returns it to its original position 49 Align the selection dial shaft bearing alignment mark G with 20 below the front See Adjustment Procedure 15 51 Install the selection unit screws in the order B ...

Page 21: ...aft through the timing belt and install with the two metal pressers and two screws Assembly Point 54 After installing the upper shaft rotate the balance wheel by hand and check that it rotates freely www promelectroavtomat ru ...

Page 22: ...haft in that order and secure with the screw Assembly Points 55 When installing the lower shaft check that the lower shaft rotates freely then align the timing of the upper and lower shafts and hang the timing belt on the upper shaft and lower shaft pulleys See Adjustment Procedure 2 56 When adjusting the tension of the timing belt with the timing pulleys check the upper shaft and lower shaft timi...

Page 23: ... assembly with the screw 61 Pass the horizontal feed arm shaft through the horizontal feed arm and install the forked connecting rod 62 Install the lock ring on the horizontal feed shaft and fasten with the horizontal feed arm set screw 63 Hang the tension spring for forked connecting rod Assembly Points 60 After installing the horizontal feed shaft assembly push the horizontal feed shaft assembly...

Page 24: ...l the inner rotary hook rotation prevention bracket with the screw See Adjustment Procedure 10 68 Install the needle plate assembly with the screw and check the feed teeth left right position See Adjustment Procedure 11 Assembly Point 67 Screw the inner rotary hook rotation prevention bracket screw C into screw hole B not A If you screw it into A it will not be possible to install the needle plate...

Page 25: ... needle bar crank rod rotates freely 69 Fasten with the contact surface flat surface of the needle bar crank rod screw at the screw A side When installing the screw A hold the balance wheel by hand so that the upper shaft does not rotate 70 Hold the balance wheel by hand so that the upper shaft does not rotate ad rotate the driver to the left to tighten the thread take up lever left screw 71 Insta...

Page 26: ...hange shaft and fasten with the screw PS53 Install the torsion spring on the BH lever installation plate install the BH lever installation plate with the two screws Assembly Points 73 Pass the presser bar through the presser spring and presser bar clamp while compressing the presser spring Be careful that the presser spring does not pop out After installing the presser bar move the presser lifter ...

Page 27: ... holder assembly with the screw 77 Hang the needle bar block assembly tension spring on the arm and needle bar block assembly 78 Install the presser clamp on the presser bar with the screw and install the presser foot 79 Install the needle and tighten the needle set screw Assembly Points 75 If the upper shaft is set to the phase with the needle bar at its lowest point it is easier to insert the ne...

Page 28: ...ll the thread tension connecting rod assembly with the two screws Assembly Points 80 Install the feed bracket assembly screws in the order A then B After installing the feed bracket assembly be careful about backlash at the feed bracket assembly gear See Adjustment Procedure 18 81 Hang the feed regulator tension spring with the shorter hook section on the feed bracket assembly 84 Hang the feed reg...

Page 29: ... with the screw 88 STAR240E STAR230E Install the PC board assembly with the three screws then fasten the lamp cord with the three bundling bands PS57 PS55 PS53 Install the 3 pin socket holder assembly with the two screws then fasten the lamp cord with the three bundling bands Lamp cord STAR240E STAR230E PS57 PS55 PS53 Lamp cord www promelectroavtomat ru ...

Page 30: ...e screw 92 Install the flat bed attachment Assembly Points 90 Pass the thread tension assembly and feed bracket assembly dial and Zigzag dial through the hole in the front cover and fit the front cover in place from above At this time make sure that the pattern selected with the selection dial and the pattern displayed on the front cover match Install with the front cover pattern display and the s...

Page 31: ... 29 2 LEAD WIRES ARRANGEMENT STAR240E STAR230E PS57 PS55 PS53 www promelectroavtomat ru ...

Page 32: ... gather the connector lead wires in a bundle and remove the connector without twisting the lead wires CN1 WB light Backstitch BK switch Bobbin winder BW switch CN1 WB light SS board CN2 BK CN3 BW CN4 FC Sensor board Speed VR board Motor Main PC board Inlet Power supply switch Controller FC jack Motor www promelectroavtomat ru ...

Page 33: ...Z FINGER POSITIONING 48 18 FEED BRACKET INSTALLATION POSITION 49 19 SUPER PATTERN TRIPLE SEWING 50 20 FEED ADJUSTMENT 51 21 BH LEFT NEEDLE DESCENT AND ZIGZAG MAXIMUM LEFT NEEDLE DESCENT ALIGNMENT 52 22 BUTTON HOLE STITCH LEFT REVERSE STITCH AND RIGHT FORWARD STITCH LENGTH 53 23 BUTTON HOLE STITCH BAR TACK FEED ADJUSTMENT 54 24 BUTTON HOLE STITCH BUTTON HOLE LENGTH 55 25 THREAD WINDING ADJUSTMENT 5...

Page 34: ...eed adjustment See Adjustment Procedure 20 BHF back feed forward reverse See Adjustment Procedure 22 BH needle descent adjustment See Adjustment Procedure 21 BHF bar tack feed See Adjustment Procedure 23 Z finger position indication gear position adjustment See Adjustment Procedure 17 16 Left baseline adjustment See Adjustment Procedure 6 www promelectroavtomat ru ...

Page 35: ...er shaft horizontal feed cam pulley section and the tension pulley and the lower shaft timing pulley 2 Align the alignment mark for the upper shaft horizontal feed cam pulley and the alignment mark for the lower shaft timing pulley with the front of the sewing machine 3 Hang the timing belt from the upper shaft horizontal feed cam pulley section and tension pulley and lower shaft timing pulley Hor...

Page 36: ... 6 Secure the tension pulley assembly with the screw Adjustment Points Driving belt Unplug the power cord before adjusting the driving belt This is done to avoid the possibility of electrical shock If the driving belt tension is not correctly adjusted the problems below may occur 1 If the driving belt tension is too great the torque may become excessive causing the motor to rotate slower and gener...

Page 37: ...d 5 Tighten the two screws for the Zigzag dial assembly 6 Turn the balance wheel through position where the Z finger mounts the peak of the pattern cam 7 Loosen the screw holding the eccentric nut A turn the eccentric nut A with a spanner and tighten the eccentric nut A screw at a position where the needle does not moves even if the Zigzag dial is turned 0 and maximum 8 Loosen the screw securing t...

Page 38: ... the needle bar at a position where the distance from the needle plate top surface to the needle tip 14 is 5 6 mm 5 Turn the worm gear or pattern cam to put the Z finger and pattern cam in the state shown in Figure A 6 Tighten the three screws securing the worm gear 7 Turn the balance wheel and check how the needle flows Adjustment Points 6 At this time adjust the meshing of the worm gear and patt...

Page 39: ...he balance wheel and drill a small hole in the paper with the tip of the needle for left needle descent 4 Turn the selection dial and left straight line sewing 5 Loosen the screw securing the eccentric nut 6 Adjust the eccentric nut so that the tip of the needle comes to the position of the hole drilled in 3 7 Tighten the screw securing the eccentric nut Adjustment Points 6 In left straight line s...

Page 40: ...edle descent positions the needle does not touch the rotary hook assembly point Adjustment Points If there is a difference in the clearances between the rotary hook assembly point and the routing surface of the needle at the left and right needle descent positions loosen the needle bar block shaft A set screw and adjust the needle bar block assembly left right position to eliminate the difference ...

Page 41: ...n and align within the range 1 0 1 4 mm 5 Tighten the screw securing the needle bar holder Adjustment Points 5 When adjusting the needle bar height the needle bar is turned easily and this can cause obstructions to sewing When adjusting be careful that the front surface of the needle holder After adjusting the needle bar height check the threading hook vertical position Adjustment Procedure 29 If ...

Page 42: ... the screw securing the inner rotary hook retainer plate L 2 Adjust the vertical position of the inner rotary hook retainer plate L and adjust so that the clearance between the inner rotary hook presser plate L and the rotary hook assembly top surface is 0 4 0 6 mm 3 Tighten the screw securing the inner rotary hook retainer plate L 0 4 0 6 mm Inner rotary hook retainer plate www promelectroavtomat...

Page 43: ...racket 2 Adjust the forward back position of the inner rotary hook rotation prevention bracket so that the hanging difference for the inner rotary hook rotation prevention bracket spring and inner rotary hook projection section is 1 6 1 8 mm Note Adjust so that the inner rotary hook A surface is perpendicular to the feed direction 3 Tighten the screw securing the inner rotary hook rotation prevent...

Page 44: ...e maximum feed distance ADJUSTMENT 1 Turn the feed dial to maximum 2 Turn the selection dial to straight line sewing 3 Loosen the screw securing the horizontal feed plate 4 Align the feed dog left right position 5 Tighten the screw securing the horizontal feed plate 6 Turn the upper shaft pulley to the feed start position 7 Loosen the screw securing the horizontal feed arm 8 Set the clearance betw...

Page 45: ...og height is 0 9 1 1 mm at the center of the feed dog 4 Tighten the screw securing the vertical feed finger Adjustment Points If the feed dog height is not correctly adjusted the following problems may occur 1 If the feed dog is too high they may touch the rear of the needle plate and make noise front rear movement may deteriorate the feed distance may become inaccurate and the sewing machine may ...

Page 46: ...adjust so that the distance between the top surface of the needle plate and the bottom surface of the presser foot is 6 0 6 5 mm 4 Tighten the screw securing the presser bar clamp Adjustment Point 3 Check that the side surface of the presser foot and the needle plate feed dog groove are parallel If the presser foot is not parallel the needle may strike the presser foot or the fabric may not feed s...

Page 47: ...3 Pull the thread slowly with the tension gauge in the direction shown in the figure and adjust by turning the thread tension adjustment screw so that the reading on the tension gauge is 0 33 0 38 N 33 38 g f 4 Tighten the screw securing the thread tension nut Adjustment Point 3 Adjust with the thread just passing the thread tension adjustment plates and not passing the upper thread guide plate Fo...

Page 48: ...he screw securing the presser plate 2 Rotate the selection dial bearing to adjust the play 3 Tighten the screw securing the presser plate Adjustment Points 2 Turning the selection dial bearing so that the alignment mark is up reduces play turning it so that it is down increases play Alignment mark www promelectroavtomat ru ...

Page 49: ...dial is turned the appropriate pattern display comes to the center of the display window on the front cover Adjustment Point This adjustment is not normally required After installing the front cover if the displayed pattern and the sewn pattern match but the front cover pattern display is not at the center of the window is tilted adjust 1 When adjusting the indication gear be careful that the sele...

Page 50: ...to the cam 2 Turn the selection dial to zigzag sewing and loosen the two screws securing the indication gear 3 Move the selection cam left and right and align the Z finger and the pattern cam center 4 Tighten the two screws securing the indication gear 5 Turn the selection dial and check the position of the Z finger relative to the cam Selection dial Z finger Z finger www promelectroavtomat ru ...

Page 51: ... C D Adjustment Points 2 If the feed dial gear alignment mark and idle gear alignment mark do not match remove the idle gear lock rating move the gear meshing to lineup the alignment marks then reinstall the lock ring Be careful about backlash between the feed dial gear and idle gear and the feed cam If the backlash is too small the feed dial moves sluggishly If the backlash is too large the inten...

Page 52: ...d reverse stitches 4 Tighten the feed adjuster nut Adjustment Points 3 Turning the adjustment screw to the right increases the reverse stitch length turning it to the left increases the forward stitch length 4 When fastening the adjustment screw with the nut in order to maintain the position and prevent deviation hold the adjustment screw with the driver while you tighten down the nut When adjusti...

Page 53: ... 2 2 mm 4 Tighten the adjustment screw nut Adjustment Points 3 Adjust by moving the feed dial gear position left and right so that when normal paper is laid under the presser foot and the balance wheel is rotated by hand 11 rotations 10 pitch in the forward direction the distance that the normal paper is fed is 1 8 2 2 mm If the 19 SUPER PATTERN adjustment is not executed before the FEED ADJUSTMEN...

Page 54: ...el to lower the tip of the needle to the paper with left needle descent 4 Turn the selection dial to button hole 5 Turn the balance wheel and lower the tip of the needle to the paper with left needle descent 6 Loosen the adjustment screw nut 7 Turn the adjustment screw to adjust the needle descent 8 Tighten the adjustment nut Adjustment Points 7 When you turn the adjustment screw to the right the ...

Page 55: ... driver as shown in the figure since the selection dial interferes slightly with the box driver remove the selection dial screw and the selection dial beforehand 4 Turning the adjustment screw to the left makes the left reverse stitches finer turning it to the right makes them larger Also check that the alignment mark for the BH fine adjustment knob is facing straight up 5 When fastening the adjus...

Page 56: ...e the selection dial screw and the selection dial beforehand 3 To forward the bar tack turn the adjustment screw to the left To reverse the bar tack turn the adjustment screw to the right 4 When fastening the adjustment screw with the nut in order to maintain the position and prevent deviation hold the adjustment screw with the screwdriver while you tighten down the nut Note that unless the 22 BUT...

Page 57: ... mark 2 on the BH lever 3 Tighten the BH change arm set screw 4 Loosen the screw securing the eccentric nut 5 Turn the eccentric nut and align with 0 5 1 1 N 50 110 gf on the BH lever return side The adjustment should be made within 1 2 rotation of the eccentric nut 6 Tighten the screw securing the eccentric nut Adjust the BH lever changing timing with the BH notch adjustment screw 21 23 mm 20 mm ...

Page 58: ...ve and the thread winding shaft spring position should be aligned 2 If the thread winding thread guide screw is loosened too much the nut will fall into the sewing machine so be careful not to loosen this screw too much 3 When adjusting the bobbin winding for the case shown in B lower the lower thread winding thread guide for the case shown in C raise the lower thread winding thread guide 4 If the...

Page 59: ...ch the lengths for forward stitches and reverse stitches Adjustment Point 4 Turning the adjustment screw to the right increases the length for reverse stitches 27 INNER ROTARY HOOK TENSION STANDARD The inner rotary hook tension should be 0 1 N 0 12 N 10 12 gf when 60 polyester thread is pulled slowly with the tension gauge ADJUSTMENT 1 Correctly mount a bobbin with polyester thread 60 green on the...

Page 60: ... Check the needle stop position the same as in Step 1 Adjustment Points 3 Turning the rotation shutter in the A direction raises the needle stop position turning the rotation shutter in the B direction lowers the needle stop position 3 Adjust the axial direction position of the rotation shutter to position it at the center of the groove in the insulation cover center of the photoinductor groove 4 ...

Page 61: ... of 3 the switch does not come ON in the reverse sewing lever play range range in which the feed adjuster is not pressed 3 Tighten the backstitch switch screw 30 BOBBIN WINDER SWITCH ADJUSTMENT BOBBIN WINDING STAR240E STAR230E Only STANDARD The gap between the bobbin winder switch and the bobbin winder shaft base must be 0 4 1 0 mm and in the bobbin winding state the bobbin winder switch must come...

Page 62: ... needle threader accepts only the circled needle and thread combinations 2 Combinations marked with can be used but are not recommended since they might lead to the break each of needle threader performance 3 Lower the presser foot when you use the needle threader 4 When using nylon transparent thread always use in the range machine needle 14 16 regardless of the table below 5 Do not turn the bala...

Page 63: ... securing the needle threader base 3 Move the needle threader base left and right and adjust so that the hook comes to the center of the needle hole then tighten the two screws securing the needle threader base 4 Loosen the screw securing the positioning support 5 Adjust the positioning support up and down so that the clearance between the hook and the top end of the needle hole is 0 0 1 mm 6 Chec...

Page 64: ...NEEDLE THREADER 1 Removes the two screws securing the hook 2 Install the new hook then tighten the two screws securing the hook 3 If the threader hook does not enter the needle hole correctly adjust the threader 29 NEEDLE THREADER Screws securing hook www promelectroavtomat ru ...

Page 65: ... 8 Needle breaks 65 9 Noise 65 10 Forward and reverse feedings differ 65 11 Improper length of buttonhole legs 65 12 Improper buttonhole size against button size 65 13 Unbalanced patterns 65 14 Needle hits needle plate when pattern selector dial is turned 65 15 Fabric gathers 65 16 The stitch shown in the pattern indication window is different from the one being sewn 66 17 Light is off 66 18 Motor...

Page 66: ...ectly 5 Upper thread breaks during sewing 1 Bent or blunt needle 2 Improper setting of needle 3 Thread tension is too tight 4 Thread is tangled 5 Inferior needle eye 6 Inferior needle slot of needle plate 7 Inferior upper thread path 8 Inferior thread 9 Needle hits needle plate or rotary hook 10 There are scratches on inner rotary hook 1 Change the needle 2 Set the needle correctly 3 Adjust tensio...

Page 67: ...ffer 1 Improper adjustment of reverse sewing lever 1 Refer to P 57 11 Improper length of buttonhole legs 1 Improper adjustment 1 Adjust screw Refer to P 54 12 Improper buttonhole size against button size 1 Improper adjustment of buttonhole length 1 Adjust the length of buttonhole Refer to P 55 13 Unbalanced patterns 1 Stitch length dial is not set at SS 2 Feed dog is worn out 3 Improper height of ...

Page 68: ... indicator plate are not aligned correctly 1 Adjust the release volume Refer to P 37 2 Adjust the pattern indicator Refer to P 47 17 Light is off 1 Inferior light bulb 1 Replace the light bulb 18 Motor does not run 1 Inferior foot controller 2 Inferior motor or inferior brush 1 Replace the foot controller 2 Replace the motor Be sure to turn off the power www promelectroavtomat ru ...

Page 69: ...edle does not stop in the up position 73 7 The sewing machine does not turn when the reverse sewing switch is pressed or if the switch is pressed during operation it does not go into low speed However when the foot controller is used the speed is not supposed to become slow speed 73 8 During thread winding the motor starts but stops immediately 74 9 Sewing machine does not operate normally when fo...

Page 70: ...E only SS board CN1 WB light CN2 BK CN3 BW CN4 FC Sensor board Speed VR board Motor Main PC board CN1 WB light Inlet Power supply switch Controller FC jack Motor Backstitch BK switch Bobbin winder BW switch www promelectroavtomat ru ...

Page 71: ...240E only CN4 Foot controller jack CN3 Bobbin winder switch CN2 Backstitch BK switch CN1 Lamp LJ1 FG Line Sensor board CN6 SS VR board CN7 Power supply switch CN8 Inlet Power supply input CN9 Motor www promelectroavtomat ru ...

Page 72: ...230E only CN4 Foot controller jack CN3 Bobbin winder switch CN2 Backstitch BK switch CN1 Lamp LJ1 FG Line Sensor board CN6 SS VR board CN7 Power supply switch CN8 Inlet Power supply input CN9 Motor www promelectroavtomat ru ...

Page 73: ... 71 SS VR board STAR240E STAR230E only STAR240E STAR230E Speed volume Start Stop switch 1 pin Speed volume Start Stop switch 1 pin www promelectroavtomat ru ...

Page 74: ...assembly connector On 1Ω max Off Infinite 4 Is the reverse sewing switch normal Resistance between 1 2 on connector CN3 yellow On 1Ω max Off Infinite 5 Is the resistance 1Ω max between 2 3 of CN4 on the pin jack assembly PC board when the foot controller is not plugged in 6 Others 1 Adjust the mechanism so that it turns easily 2 Replace the motor 3 Replace the SS VR PC board assembly 4 Replace the...

Page 75: ...rd assembly and main PC board assembly installation normal Are they floating loose or tilted 3 Is the bobbin winder switch normal Resistance between 1 2 on connector CN3 red On 1Ω max Off Infinite 4 Does the voltage between 4 and 3 on connector CN5 change between 0 and 5 V when the sewing machine is turned by hand 5 Others 1 Check and adjust as necessary 2 Correct the installation 3 Replace the bo...

Page 76: ... vary between 0 and 10 kΩ 2 Is the resistance normal between 2 3 of CN4 on the pin jack assembly PC board When plug inserted Infinite When plug removed 1Ω max 3 Others 1 Replace the foot controller 2 Replace the main PC board assembly 3 Replace the main PC board assembly 10 When the sewing machine starts the warning buzzer buzzes and it stops immediately 1 Are the sensor PC board assembly and main...

Page 77: ...STAR240E STAR230E PS 57 PS 55 PS 53 H1060212 www promelectroavtomat ru ...