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Pfaff 938 manual 94

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General plan – circuit diagrams

Version 10.03.04 91-191469-95Part 1

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Contents

Industrial INSTRUCTION MANUAL PFAFF Industriesysteme und Maschinen AG Contents Chapter – Page Transportation, packing and storage Keys on the machine head (only on machines with Quick-flangemotor) Connect the plug-typeconnections and earth cable of the Quick-flangemotor Page Chapter – Page 1 Safety 1.01 Regulations 1.02 General notes on safety 1.03 Safety symbols Caution 1.04 Important notes for the user 1.05 Notesforoperatingandtechnicalstaff 1.06 Danger 2 Proper use Specifications ▲ 4DisposalofMachine Transportation,packingandstorage Transportationtocustomer'spremises Transportationinsidethecustomer'spremises Disposalofpackingmaterials Storage 6 Explanationofsymbols 7 Controls 7.01 Mainswitch Keysonthemachinehead 7.03 Pedal 7.04 Lever for raising presser foot 7.05 Adjustmentleverforzigzagstitchandneedleposition Reverse-feedkey 7.07 Stitchlengthadjustmentwheel 7.08 Adjustment lever of the underedge trimmer -771/04 Controlpanel Page 8 Installationandcommissioning 8.01 Installation 8.01.02 Mounting the upper V-beltguard / Fitting the machine cover 8.01.03 Fitting the reel stand 8.03 FitthebeltguardoftheQuickflange-motor 8.04 Connecttheplug-typeconnectionsandearthcableoftheQuick-flangemotor 8.05 Commissioning 8.06 Switchingthemachineon/off Basicsettingofthemachinedriveunit Page Mounting/connectingthestartinhibitor 9 Settingup 9.01 Insertingtheneedle 9.02 Windingthebobbinthread;adjustingtheprimarythreadtension 9.03 Removing/insertingthebobbincase 9.04 Threadingthebobbincase,adjustingthethreadtension 9.04.02 PFAFF 938 with thread trimmer PFAFF 9.05 Threadingtheneedlethread/Adjustingtheneedlethreadtension 9.06 Settingthezigzagstitchandthestitchposition 9.07 Adjustingthestitchlength 9.08 Enteringthestartandendbacktacks Sewing 10.01 Darningprogram 10.02 Countedseam 10.03 Error messages Care and maintenance 11.01 Cleaning 11.02 Lubricatingthehook 11.03 Oilingthezigzagdrive Cleaning the air filter of the air-filter /lubricator 11.05 Checking/adjusting the air pressure 12 Adjustment 12.01 Notesonadjustment 12.02 Tools,gaugesandotheraccessoriesforadjusting 12.03 Abbreviations 12.04 Checkandadjustmentaid 12.05 Adjustingthebasicmachine 12.05.02 Centering the needle in the needle hole (in sewing direction) 12.05.03 Parallel guiding of the needle bar 12.05.04 Locking lever 12.05.05 Zero stitch and zigzag stitch scale Page 12.05.07 Zigzag stitch width 12.05.08 Zigzag stitch movement 12.05.09 Needle penetration symmetry (left, centre and right) 12.05.10 Needle position adjustment lever 12.05.11 Zero position of the bottom feed dog (with closed gear box) 12.05.12 Zeroing the bottom feed (with open gearbox) 12.05.13 Feeding motion of the bottom feed dog 12.05.14 Lifting motion of the bottom feed dog 12.05.15 Drive belt in the gearbox housing 12.05.16 Hook bearing bracket 12.05.17 Hook lubrication 12.05.18 Pre-adjustingthe needle height Page 12.05.20 Final adjustment of the needle height 12.05.21 Bobbin case opener position 12.05.22 Bobbin case opener motion 12.05.23 Bottom feed dog height 12.05.24 Presser foot to needle plate clearance 12.05.25 Needle thread tension release (on machines without -900/24) 12.05.26 Presser foot pressure 12.05.27 Thread diverter pin 12.05.28 Limiting the knee lever stroke 12.05.29 Knee lever play 12.05.30 Bobbin winder 12.06 Adjustingtheunderedge trimmer-771/04 12.06.02 Knife height 12.06.03 Positioning of the knife 12.06.04 Knife drive switch 12.06.05 Workpiece guard 12.07 Adjusting the thread trimmer -900/24 12.07.02 Preliminary adjustment of the control cam 12.07.03 Position of the thread catcher and cutting test 12.07.04 Readjustment of the control cam 12.07.05 Needle thread tension release 12.08 Parameter settings Example of a parameter input List of parameters 12.09 Reset / Cold start Explanationoftheerrorsignals 12.11 Internetupdateofthemachinesoftware 13 Wearing parts PFAFF938 Circuit diagrams Reference list for circuit diagrams