Pfaff creative 7550 Service Manual
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Pfaff creative 7550 Service Manual

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  • Page 1 PFAFF creative 7550 Service Manual...

  • Page 2: Table Of Contents

    7550 Self-test table for class 7550 Separate buttonhole sensor t 7550 st for Replacement list: self-test 7550 chart for of Pfaff Creative Fault-finding electronics 7550 parts table Fault for electrical table Test for creative designer Electrical safety...
  • Page 3 Foreword This service and repair manual is intended assist you in carrying out all repairs the machines quickly and correctly. Adjustment should only be carried out you find the aclual settings deviating lrom thE: requirements described here. When checki n g or adjusting a machine, please always proceed in the sequence specified. For easier reference every workstep is marked with a dot.
  • Page 4 This is solely the responsibility of our qualified service 7. Be sure to use only ori g inal PFAFF parts.
  • Page 5 Speci f i cation the PFAFF 7550 CD Electronic free-arm utility and fancy stitch machine • • Electronic stitch pattern storage • Pattern sequence memory ( M-memory) MO to M 31 There are M-memories �or pattern sequences. In each of the pattern sequences a maximum of patterns or programs can stored.
  • Page 6 • Lockstitch of types 301,302, 303, 304, 305, 308 and all other variants obtainable by sideways needle movement or forwards and reverse control of the machine feed. • PFAFF transverse double-rotating hook. • Link �ake-up. • Slide lever feed regulator for forwards and reverse stitch lengths.
  • Page 7 Notes...

  • Page 8: Feeding System

    Feeding system Adjustment toothed belt tension Requirement: The toothed belt must be so taut that the sewing hook has no play in rotating direction, must be possible to turn the machine easily. Adjustment: • (fig. 1 ). Loosen screw • Re-position tensioning roller 2 wl1h a screwdriver accordingly.

  • Page 9: Adjustment Of Feed-Dog Driving Shah In Sideways Direction

    of feed Adjustment dog driving shaft in sideways direction Requirement: The clearance between driving-shaft bush 4a and left housing edge 3a must 3.0 mm (ltg 2a) without Check: lt must be rt adjustment gauge 00-880133-01 easily, but play, between the feed-dog driVing shaft and the left housi n g edge. Note: This adjustment must only be carried out when compelling reasons exist.
  • Page 10 Check whether pull spring of the transverse-drive stepping motor is engaged the feed dog. • Connect pull spri n g to the transverse-drive stepping motor and fit the motor. Tighten the three Philips screws 201 a li t t le (fig. 2a).

  • Page 11: Timing Of Feed Motion

    3. Timing of feed motion Operating sequence: When lihe rising needle has left the fabric, the feed dog moves up above the needle plate. The risen feed dog pushes the fabric to the Shortly before the end of the feeding motion, rear.
  • Page 12 Fig. 3b , ..----- - - - -ts •...

  • Page 13: Adjustment Of Feed Dog In Sideways Direction

    feed t of dog in sideways direction Requirement: In stitch program "00", the distance of the feed dog to the right and left. edges of the feed slot must be equal (fig. 4). Check: ·oo·. In stitch program carry out visual check of the feed dog position. Note: adjustment This...
  • Page 14 Fig.4 Fig.
  • Page 15 4a. Feed dog height Requirement: feed dog, teeth In the highest position of the the points of its must protrude above the needle plate sur­ (fig face by 0 85 to 0.9 mm The tolerance must not remain under or exceed 0.85 to 0.9 mm. Check: •...
  • Page 16 � lW;; Rg. 4 o.�- Flg.4a ��� Flg.4c...

  • Page 17: Adjustment Of Synchronlzer

    Adjustment of synchronizer Note: The following machine positions or functions are controlled by the synchronizer: 1. A change feeding direction and change of stitch length 2. Sideways needle bar movement Take-up lever/needle "up" positioning Needle "down• positioning This adjustment must only carried out when compelling reasons exist! must performed...
  • Page 18 Adjustment: Leave the pointer gauge on the needle late. • Unscrew baseplate, leave electrical connections in place. & Loosen fixing collar screw by just of a turn (fig Sb and 51). ·o.s-. • Set the stitch length at • Turn the handwheel a full rotation forwards, then keep on turning until pointer 26 is...
  • Page 19 Adjusting the presser bar height Requirement: With the presser bar lifter raised there must clearance of mm between the needle plate and the sole of the zigzag foot Check: • Raise the presser bar litter. • RI the zigzag sewing foot. •...

  • Page 20: Adjustment Of Top Feed Foot

    of top feed Adjustment foot in sewing direction Requirement: The front edge the top feed f oo t must be between the first and second tooth point of the center tooth row of the feed dog (fig. Raise the presser bar litter. Remove the complete sewing foot Set the stitch length at "6".
  • Page 21 8. Adjustment of top feed foot in sewing direction Requirement: • highest working position the top feed foot must mm higher than the lower edge of foot the zigzag sole (fig. Note: This adjustment must only carried out when the height of the presser bar is set correctly! Check: •...
  • Page 22 182--- 183--- _ ________ ; 189- Fig. Sa Fig.

  • Page 23: Adjustment Of Needle In Needle Hole

    Zigzag mechanism Adjustment of needle in needle hole Requirement: in the cenler of the needle hole At the straight stitch setting, the needle must (fig. 9). The widest zigzag stitches must be the same distance from the left and right needle hole edges (fig. 9a). Check: Remove the sewing foot.
  • Page 24 fig. Fig. Fig. 9b...

  • Page 25: Stitch Forming Perts

    Stitch forming parts Foreword: The sewing hook adjustment consists basically of the three following adjustments: Needle rise Needle bar height Hook-to-needle clearance Needle rise: The needle rise is th e movement by which the needle must rise from Its lowest position until a thread scarf loop has formed on the side of the needle on which the is located.

  • Page 26: 0. Position Of Needle In Needle Hole In Sewing Direction

    Position needle in needle hole In sewing direction Requirement: There must be a clearance of 02 mm between the back edge the needle shank and the back edge of the needle hole in the needle plate (fig. 1 0). Note: Since system 130nos H needles increase in size at the needle front side only, the point of an Nm 1 00 needle is positioned exactly in the middle of needle hole (as seen in feeding direction), while the...
  • Page 27 Adjustment in relation to the sewing foo t : Loosen screw 41 (ftg. 1 Ob). with Move pin 43 together collar and needle bar frame to the front rear until needle foot Is exactly in the middle of the needle hole in the sewing (fig.
  • Page 28 Fig. §----44 Flg.10c:...

  • Page 29: Adjustment Of Hook-To-Needle Clearance

    11. Adjustment of hook-to-needle clearance Requirement: At the straight stitch settmg the distance of sewing hook point from the bottom of the scarf in the needle must be 0.05 mm (see fig. 11 ). In the widest zigzag stitch, the sewing hook point must almost touch the needle.
  • Page 30 OOSmm Fig. 11 50--- �6- - - - - - - Fig. 11e...
  • Page 31 12. Hook timing Requirement: When the needle bar moved 2 3 mm upwards from its lowest position (with the machine set for straigth stitch and center needle position), the sewing hook point must exactly opposite the center line of the needle (fig. 12a). Check: •...
  • Page 32 Ag. 12 Fig. 12 Ag.12b...

  • Page 33: Adjustment Of Needle Bar Height

    Adjustment of needle bar height This machine has a transverse double-rotating hook. On the right zigzag penetration, the sewing hook reaches the needle a little earlier and at the left penetration a little later than at the oenter penetration (fig. 13).

  • Page 34: Adjustment Of Bobbin Case

    of bobbin case posi t ion finger Adjustment Requirement: The clearance between the position finger and the bottom of the groove in the bobbin case base must Check: lt must be possible insert the clearance gauge 00-880133-01 w ith ease but without play between the position finger and the l>ottom of the groove in the bobbin case base (f·ig.

  • Page 35: Stitching Off

    Stitching off of needle 15. Adjustment threader With the threader key pushed fully down, prong 194a must pass through in the cenler between the top and bottom edge of the needle eye of a needle of size Nm 70 (fig. 15). Check: •...
  • Page 36 -- 195 -194 ----- -- 1111 ------- 1 110 st.op Adjustment of bobbin winder Requirement: The bobbin winder must stop when the thread has reached a level of 1 below the bobbin rim. Check: • Wind a bobbin and check that the w inder stops desired.

  • Page 37: Adjustment Of Needle Thread Tension

    17. A ot bobbin thread tension Requirement: The force reQuired for pulling cotton thread 50�2 or synthetic fibre thread 10013 off the bobbin must be approximately 20 to 25 Chec e When a threaded bobbin case hangs on its thread, it must not slide downwards by its own weight e Upon sharp upward movements of the hand, the thread must run off gradually (fig.
  • Page 38 Adjustment: First turn mtlled nut fully t o the left (fig. 18d). • stitch ·s.o·, • zigzag stitch " 1 o·. width and sti t ch length "2.0". ztgzag strtch. • Sew wtth • formed the same lime turn the milled nut gradually in clockwise direction, until the knot is the center of the fabric (fig.

  • Page 39: Adjustment Of Thread Check Spring Stroke

    Adjustment of thread ,check spring stroke The thread check spring prevents the descending needle from piercing the slack needle thread. needle thread is slackened by the descending take-up lever. Requirement: Thread check spring must keep the needle thread taut at least until the needle point enters the 19).
  • Page 40 58 - - - - - se- - - - " eo- - - - - - - ' A;.1e...
  • Page 41 t of equal forward and reverse s itch justm length (for forward and reverse controlled stitch patterns) Requirement: Letters B, D. G, H sewn in succession must measure 34.5 +1- 1.5 mm and must not distorted t o 15 (fig. 20c).
  • Page 42 34,5 ±0,5 Fig. 20a Fig. 20b Fig. 20d Fig. Fig.

  • Page 43: Maki Ng Up A Sewing Sample

    (fig. 21 ). If the customer has special requirement these should appear on a separate sewing sample. The following is a sewing sample made on the PFAFF Stitch pattern Sewing loot no. Stitch width S1itch length or pattern length Zigzag foot "OA"...
  • Page 44 Repair Instructions Dismantling and assembling the needle thread tension Removal: • Remove needle thread tension. Remove circlip (fig. 22). Remove spring washer 87 and tension dial 88. Unscrew adjusti n g screw 92 from guide e Remove guide 93. 5 Pull off the adjusting screw and pressure spring 91. •...
  • Page 45 pressure spring in handwheel release Changing release handwheel Removing Remove plastic with clearance gauge 00-880 33-01 (fig Unscrew metal screw 107. Pull handwheel-release disc and pawl and remove clutch piece and pressure 1 1 0 1 1 1 1 1 3 spring 114.
  • Page 46 ,, s 1 1 6 Fig. 23 Flg. 23a --111 Fig. 23b Flg. 23d Flg.23e Flg. 23e...

  • Page 47: Cleaning And Oil I Ng The Machine

    Dismantling and assembling t sewing hook Removal: • Remove the needle. • Unscrew the sewing foot. • Remove the bobbin case. • Unscrew the bobbin case position finger. Take out the three screws with springs from behind (fig. 24). • Remove the bobbin case base with sewing hook gib (fig.
  • Page 48 Ag.24a 24«: flo. Rg.24a Fig. 24d...

  • Page 49: Changing The Toothed Belt

    Changing the toothed bell Removal: Remove needle, sewing foot and needle plate. Remove the top cover. the housing insert and tine face cover. • Turn the machine upside down. • Unscrew the four screws of the baseplate. • rn the baseplate upside down.
  • Page 50 138 -- A g. Fig.
  • Page 51 Fi t ting: toothed bell 136 and pull it upward Insert (fig 26c). • • 133 t o the leh through toothed 136 into the leh bearing and into arm shall Push arm shah bell crank 131. • RI circlip 132 on th e shall.
  • Page 52 --117 117-- Fi g .26e...
  • Page 53 Adjusting arm shaft crank ·oo· for • Set stitch pattern straight sti t ch. allow Loo s en screw 130 In shalt crank 131 just enough to the arm shaft crank to be turned on shaft (fig. 26h). Ra i se 1he needle bar and Insert the needle.
  • Page 54 130, Ag.26h Fig. Fig. Fig. 26i Fig.

  • Page 55: Changing The Bevel Gears

    the bevel Changing gears Note: Always change bevel gears in pairs Removal: • Remove the needle, sewing foot and the needle plate. • Remove the top cover, the housing insert and the face cover. • Turn the machine upside down. Unscrew the four screws of baseplate.
  • Page 56 • Disconnect pull-spring (fig 27b). • loosen screw • section Remove transverse-drive stepping motor according to Remove feed-dog lowenng mechanism • case screws 54 ol Unscrew bobbtn position finger. case • Place aside. bobbin position finger and the leaf spring •...
  • Page 57 Fitting: (fig. 27c) Insert the new bevel gear complete with sewing hook bearing 60 in the machine Insert feed driving shaft • Insert the two cylindrical pins 4 and 6 with the plastic washers Fit bobbin case position finger 53 and the leaf spring. •...
  • Page 58 50 49 63 64 61-- Fig. 27c Fig. 27d...
  • Page 59 • Now the flat cables are connected to the circuit IJoard as follows: 1 1 8 (both Motor plug to motor socket catches must engage). • 1 1 6 1 1 7 Two-connection plug two-pin base. • to the The plug of five-wire flat cable 127 to the black pin base.
  • Page 60 61- - 62 45 Fig. Fig. 27d...
  • Page 61 28. Changing circuit board bottom Note: The bottom circuit board is only exchanged as a complete unit. Removal: • Remove the mains lead from the mains socket and from the machine. Turn the machine upside down. Unscrew the four screws of the baseplate. Turn the baseplate around.

  • Page 63: Changing The Thread Monitor

    29. Changing the thread monitor with the free-arm cover Note: The thread monitor is only exchanged complete with the free-arm cover. Removal: • Remove mains lead from mains socket and machine. • Tum the machine upside down. Unscrew the four screws of the baseplate. •...
  • Page 64 Flg. 2h ... ! · ·· 15 3 Fi g. 29b...

  • Page 65: Changing The Control Panel

    30. Changing the control panel Note: The programming panel Is only exchanged complete with the front housing cover. Removal: • Remove mains lead from mains socket and machine. Remove top cover, housing insert and face cover. • Remove the circlip of the retaining pin (fig. 30b). Remove the retaining pin.
  • Page 66 Fig. Fig. Fig. 30b Flg.30c:...
  • Page 67 F itting: • Introduce the twelve-wire flat cable 121 from below into the machine. • Place the programming panel correctly on the machine housing. Insert the two screws press the programming panel against the machine and screw o n the screws (fig.
  • Page 68 �· Fig. 30a Fig.

  • Page 69: Changing The Synchronizer

    31. Changing the synchronizer Note: The synchronizer is only exchanged as a complete unit Removal: Remove mains plug from mains socket Turn the machine upside down. • Unscrew the four screws of the baseplate. • Turn the baseplate aroumd. • flat Pull off the plug of five-wire cable 127 (fig.
  • Page 70 Fig. - - - - Fig. 31a...

  • Page 71: Changing The Motor

    Changing the motor Note: The motor is only exchanged complete. Removal: • Remove the mains lead from mains socket and machine. Remove top cover. housing Insert and face cover. • • Remove programming panel according to section 32). • Unscrew the right-hand motor retaining screw (fig.
  • Page 72 --- - 141 148 - ---121 '----- 144 Flg. 32...

  • Page 73: Changing The Motor Circu

    33. Changing the motor c ircuit board Note: The circuit board only exchanged complete In Germany the motor must be exchanged along with the circuit board. Removal: • Remove the motor according t o section 32 of the adjustment and repair Instruct ions Raise the two locking tabs 155 just a little and remove cover 156 (fig.

  • Page 74: Changing The Motor Pinion

    Changing the motor pinion Note: The motor pini o n is only removed when a rotor is exchanged. Removal: • Remove the motor according to section 32 of the adjustment and repair Instructions. • Insert two screwdrivers of the same w idth betwee n pinion 142 and the motor bearing (fig. 34).

  • Page 75: Changing The Cable Reel In

    Changing the cable ree l i n the toot control Note: fool with the In Germany the control must be exchanged along cable reel. Remov•l of the cable reel: it out with • lift rubber strip 167 pull its three feet (fig. 35). •...
  • Page 76 Q-- -------�65·---------Q Fig. 166- - - - ® 0 170--------' 171--- - Fig. -.
  • Page 77 the top stepping needle bar movement 36. Changing motor for sideways Note: The stepping motor for sideways needle bar is only exchanged complete. movement Removal: Remove mains lead from mains socket. Remove detachable work support. Remove top cover. e Swi t ch on bobbin winder.
  • Page 78 Fig. 36e Flg. 38a - - 117 ,118 Fig. 36 Fig.
  • Page 79 (fig. Unscrew right-hand motor retaining screw 36d). • • Use a screwdriver to lift motor cover at the right-harnd side and remove it 146. • Disconnect light plug Unscrew the second motor retaining screw • 140. motor sprocket out of toothed bell and remove the motor to the front.
  • Page 80 ' -- - - - 1 44 Flg.35d I e:;r- · Flg.35e...
  • Page 81 F itting: When • Install the new stepping motor (fig. 36e). doing make sure that bolt 36 of connecting rod 34 enters the hole of the tooth segment. • Place seven-wire flat cable 125 downward and Install the cable at right side in the corner housing.
  • Page 82 141 - 147- --- -- 144 Fig.
  • Page 83 • Insert the twelve-wire flat cable 121 downwards in the machine. • Fit the complete programming panel correctly on the machine housing. • Insert the screws 68, press the programming panel against the machine housing, and tighten the screws (fig. 3Sc).
  • Page 84 Fig. Fig. 38a -- 117 Fig. 38b Fig. 38...

  • Page 85: Changing The Lower Stepping Motor For The Feed Movement

    37. Exchanging the lower stepping motor for the feed movement Note: The feed stepping motor is only exchanged complete. Removal: • Remove the needle, the sewing foot and the needle plate. • Remove the top cover, the housing insert and the face cover. •...
  • Page 86 Fig. 37a i ((]) 10-- - - - Fig.
  • Page 87 F'rtting: • Insert the new feed stepping motor complete with bracket (fig. 37b). • Insert and lightly tighten upper retaining screw 16. • Insert and lightly tighten clamp spring 15a with screw 16. • Push sli d e block 12 with spring onto the and set it in the guide slot in the correct curve radius...
  • Page 88 Fig. -15a --15 10 - - - - - Fig.
  • Page 89 Now the flat cables are connected follows (fig. • the circuit board 37a): Motor plug 1 1 6 to motor socket • (both catches 1 1 7 must engage). Two-connection plug 124 to the two pin base. • • plug of five-wire flat cable 127 to the black base.
  • Page 90 - - 11 7 1 1 7 - - -118 128 123 1124 126 127 Fig. 378...
  • Page 91 Changing llhe stepping motor for transverse-drive Note: The transverse-drive stepping motor is only exchanged complete. Removal: e Remove mains lead from mains socket and machine. e Remove the needle, the sewing foot and the needle plate. • Turn the machine upside down. e Unscrew the four screws of the baseplate.
  • Page 92 Fig. 38a Fig. Fig. 38c Fig.
  • Page 93 Fitt ing: Note: sverse Make sure that pull-spring 199 of the -drive stepping motor is hooked on at feed dog. Hook pull-spring 199 transverse-drive stepping motor and Install the transverse-drive stepping motor. • Insert and lightly tighten the three Philips screws 201 (fig. 38b). •...
  • Page 94 1111 1 54 3lla Fig. Fig. Flg. 311c...
  • Page 95 Changing buttonhole aenaor Note: The buttonhole sensor is only exchanged complete Remove from socket Remove mains lead mains and machine. • Remove needle. the sewing foot and the needle plate. Turn the machine upside down. • Unscrew the four screws of baseplate.
  • Page 96 3111 1 Fig. 1 124 Flg.39...
  • Page 97 F rt t i ng : • with Insert the complete buttonhole sensor the pressure spring (fig. 39b). • Insert the bobbin thread monitor and secure it with screws (fig. 39a) • Place the five-wire and the four-wire flat cables in the cable guides. •...
  • Page 98 -117 Fig.3ia I 1h :1 24 128 127 Fig. Fig.

  • Page 99: Important Key Functions Of Class

    Important key functions of class 7550 Self-test: Press key "sew slow" and master switch. Find code: Press key "sew slow" and master switch, then press key "pattern start". Cycle track: Press key "sew slow" and master switch, then pren key "needle down". "sew Date: Press key...
  • Page 100 Connect foot control, machine. Needle bar Master switch off. Have buttonhole gaugo and full bobbin ready. Press key ·sew slow• and actuate PFAFF master switch P F A F F P F A F F after self-test LEDs and D isplay are flashing.
  • Page 101 Stepping motor test case need le Feed Stepping motor bar are moved a few stepping motor times. error repeat lest. Need le bar pos. up . Buttonhole sensor test Fully insert buttonhole Buttonhole gauge. sensor test You have 12 s. max.
  • Page 102 Thread monitor test monitor lower Thread Insert full bobbin. Test (Close free-arm lid). (Sewing machine Press foot control. runs speed, stands still.) same Insert empty lower bottom. display (Close free-arm lid). Press root control. (Sewing machine runs at low speed. stands sti l l.) "OK"...

  • Page 103: Separate Buttonhole Sensor T

    test 42. Separate buttonhole sensor 7550 Remarks Machine Visual check! Action at machine display Function Press key "sew stow• P F A F F and actuate master switch. Press key "tie off" Buttonhole drOcken. sensor test Buttonhole In case of Insert buttonhole gauge.

  • Page 104: Replacement List: Self-Test 7550

    Replacement list: self - test 7550 part part 1st replacement Displayed error message 2nd replacement Z igzag stepping motor error Zigzag stepping motor Control board Maxi feed stepping transverse-drive Control board motor error (transverse-drive stepping motor) Feed stepping Feed stepping motor Control board motor error Synchronlzer error...

  • Page 105: Fault-Finding

    Fault-finding chart tor the electronics of Pfaff Creative · 7550 CD CIOW treo-arM c:OYe'. ln.�rt m� iM lead. aw(Jch on tiObnln wln&:Hf, tnserl full OObbi n. 50t nM"!Sle bl!lr at LoP �. connect toot conttOf , $W<tdl on �S:.Ot sw•tch...
  • Page 106 If the tt7 st bill been petiOrti"'CCd tor ft!CI 5CQ\Itii1Ce ngh1 1o tho e nd Of t.trrt t a l'ld me e-rr01 51111 o..d •t t. . U\On e.tJ ry OUI tn lt litto'i 10$1 P' OQf "'" OU)@t progri.m O:sc;tay the oro;r•"""I'IO patW�I l"f rO!&...
  • Page 107 Creative 7550 CD Replacement chart for fault-finding chart Pfatf (rcnti"Qf' t:cc��no<t COfW(M llfrt� bUlb tooc cont1 ot I·OI�G [a­ Replaceme nt sequence: K po$Siblo, check subassem bl y to be replaoed without fitting 11. e.g. head control panel Ot' programming panel ..
  • Page 108 45. Fault table for the electroni<: parts Fault 1 st replacement pt. 2nd replacement pt 3rd replacement pt. 4th replacement 5th replacement lead foot control master switch master switch with Machine switched mains programming panecl does not motor run when foot circuit board.
  • Page 109 Fault table for the eleebon lc parts Fault 1st replacement 2nd replacement pl 3rd replacement pt. 4th replacement pt. on thread monitOI' hook panel signal Clean sewing arm, Thread monitOI' Circuit board Programming hook mirrOI', bobb i n case and the two sensors Feed out bottom...
  • Page 110 Testta b le for CREAT1VE·OESIGNER Test arrangement: Machine of C 7550 CD In functioning order, test adapter type and Creative be tested Action at machine/ Visual check Remarks Step Creative Designer test adapter Visual check sewing machine Cl. 7550 CO swit ch off.
  • Page 111 Press ·mem +" Display shows: Display does not show final value: Creative Designer defective Display shows: Press key I once Move coordinates slide slowly Display does show top left to the corner the final value: Creative designer defective not show Press "memory"...
  • Page 112 Safety test 47. Electricai Nfety test According to the German taw on safe machine opera t ion of 24-6-86, the VDE-regulations are regarded as the official rules in electronics and are the basis for the regulations for testi n g electrical safety of technical devices.
  • Page 113 Fig. Fig. 48c 1 1 2...
  • Page 114 Flg. 48 Flg.48a 1 1 3...
  • Page 115 Stray current test o f complete motors with Metrawatit M 5013 current test of complete motors Stray • When exchanging complete motors or motor parts (windings, rotors or capacitors), the complete motor must be measured for stray currenl before fitting the machine.
  • Page 116 Fig.

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