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Pfaff
938 manual
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Part 2
Version 10.03.04
General plan – circuit diagrams
14 - 3
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
