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Brother BAS-311G Standard thread tension, Upper and lower thread tension, Adjustment

Models: BAS-311G

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7. ADJUSTMENT

7-2. Standard thread tension

Specifications	Heavy-weight materials (-01)		Medium-weight materials (-02)

Upper thread	#20 or similar		#50 or similar

Lower thread	#20 or similar		#50 or similar

Upper thread tension (N)	1.4 − 1.8		0.8 − 1.2

Lower thread tension (N)	0.2 − 0.3

Thread take-up spring height	7	− 10
(mm)	7	− 10
(mm)
Thread take-up spring	0.6 − 1.2		0.2 − 0.5
tension (N)	0.6 − 1.2		0.2 − 0.5
tension (N)
Pre-tension (N)	0.1 − 0.6		0.1 − 0.3

Needle	DP x 17 #19		DP x 5 #16

Normal sewing speed	2,000 rpm		2,000 rpm

7-2-1. Upper and lower thread tension



4661Q	5155Q

BAS-311G, BAS-326G

Page 96

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Brother BAS-311G service manual Standard thread tension, Upper and lower thread tension, Adjustment

Contents

SERVICE MANUAL Please read this manual before making any adjustmentsBAS-311G BAS-326G PROGRAMMABLE ELECTRONIC PATTERN SEWERSAFETY INSTRUCTIONS 1 Safety indications and their meaningsSymbols IndicationsInstallation 2 Notes on safetyDANGER Environmental requirementsCleaning Maintenance and inspectionSewing If an error occurs in machine operation, or if abnormal3 Warning labels Motor coverTension release solenoid coverCONTENTS SPECIFICATIONSFUNCTION SETTINGS DISASSEMBLY6. ASSEMBLY 7. ADJUSTMENT9. TABLE OF ERROR CODES 10. TROUBLESHOOTING1. SPECIFICATIONS 1. SPECIFICATIONS2. FUNCTION SETTINGS 2-1. List of special functions when power is turned on2. FUNCTION SETTINGS 2-2. List of advanced functions 2. FUNCTION SETTINGSWhen SPEED indicator is illuminated 4550Q2-3. Memory switch setting method Advanced 2. FUNCTION SETTINGSmemory switches that have been changed from default settings2-4. List of memory switch settings 2. FUNCTION SETTINGSInitial value range2. FUNCTION SETTINGS Work clamp settingsFor solenoid specifications 1 pedal For pneumatic specifications 2 pedal2. FUNCTION SETTINGS Thread winding2. FUNCTION SETTINGS Sewing machine motor settings2. FUNCTION SETTINGS Feed settings2. FUNCTION SETTINGS Operation panel settingsUser program settings 2. FUNCTION SETTINGS Data editing settingsDevice settings 2. FUNCTION SETTINGS 2. FUNCTION SETTINGS Error processing settingsMaintenance settings Specifications and destination settings2-5. Setting the work clamp mode 2. FUNCTION SETTINGSUnique machine settings Solenoid specifications, single pedal standard operations2-6. Stitch counter checking method 2. FUNCTION SETTINGSPneumatic specifications, 2 pedal standard operations Pneumatic specifications, 2 pedal sequence operation2-7. Error history checking method 2. FUNCTION SETTINGSE − − − 2-8. Input checking method 2. FUNCTION SETTINGSInput check list Name2. FUNCTION SETTINGS − − − −2. FUNCTION SETTINGS 2-9. Output checking method 2. FUNCTION SETTINGS4567Q 4441Q 4953Q2. FUNCTION SETTINGS 2-10. Software version checking method 2. FUNCTION SETTINGSPanel CPU Programmer3. READING / WRITING DATA 3-1. Handling dataSewing machine internal memory 3. READING / WRITING DATA3-2. Notes on handling CF cards sold separately 3-3. Structure of a CF card folder3. READING / WRITING DATA 3-4. Data read/write mode Turn on the power switchSwitch to data read/write mode 3. READING / WRITING DATA3-5. Reading sewing data from CF cards When memory switch No. 755 is ON3. READING / WRITING DATA End data read/write modeWhen memory switch No. 755 is ON 3-6. Writing sewing data to CF cards3. READING / WRITING DATA Select the w 2 data read/write mode3-7. Reading memory switch data from CF cards 3-8. Writing memory switch data to CF cards3. READING / WRITING DATA End data read/write mode3-9. Reading user program data from CF cards 3-10. Writing user program data to CF cards3. READING / WRITING DATA End data read/write mode3-11. Updating the control program Restoring the control program if an error occurs during updating3. READING / WRITING DATA 3-12. Writing error log data to CF card 3-13. Reading sewing data from floppy disks3. READING / WRITING DATA End data read/write mode3-14. Writing sewing data to floppy disks 3. READING / WRITING DATA5 End data read/write mode 1 Insert the floppy disk into the floppy disk drive3-15. Reading extended option output data from a CF card 3. READING / WRITING DATA5 End data read/write mode 3-16. Writing extended option output data to CF cards 3-17. Reading extended option output data from floppy disks3. READING / WRITING DATA 3 End data read/write mode4. MECHANICAL DESCRIPTIONS 4-1. Needle bar and thread take-up mechanisms4-2. Lower shaft and shuttle race mechanisms 4. MECHANICAL DESCRIPTIONS4-3. Work clamp lifter mechanism Solenoid specifications 4. MECHANICAL DESCRIPTIONS4-4. Work clamp lifter mechanism Pneumatic specifications 4-5. Intermittent presser foot lifter mechanism4. MECHANICAL DESCRIPTIONS 5045Q4-6. Intermittent presser foot stroke mechanism 4. Stepping clamp connecting rod 5. Stepping clamp arm R4. MECHANICAL DESCRIPTIONS 1. Motor assy 2. Upper shaft 3. Stepping clamp cam4-7. Feed mechanism X directionY direction 4. MECHANICAL DESCRIPTIONS4-8. Thread trimmer mechanism 11. Movable knife lever 12. Movable knife connecting plate4. MECHANICAL DESCRIPTIONS 1. Thread trimmer solenoid 2. Solenoid lever 3. Pushing lever4-9. Tension release mechanism 4-10. Thread wiper mechanism4. MECHANICAL DESCRIPTIONS BAS-311G, BAS-326G5. DISASSEMBLY 5-1. Covers5. DISASSEMBLY 5-2. Thread wiper mechanism 5. DISASSEMBLY2. STOP switch harness Pull out 3. Bolt 4. Plain washer 1. Thread wiper solenoid harness Pull outPneumatic specifications 5-3. Work clamp arm mechanism5. DISASSEMBLY BAS-311G, BAS-326G5-4. Intermittent presser foot lifter mechanism 5. DISASSEMBLYPresser bar Pull downward from presser bar clamp 5-5. Needle bar mechanism 5. DISASSEMBLY5092Q 5093Q5-6. Upper shaft mechanism 5. DISASSEMBLY5094Q 5-7. Lower shaft mechanism 5. DISASSEMBLY5-8. Feed covers 5. DISASSEMBLYBAS-311G, BAS-326G 5101Q5-9. Feed mechanism 5. DISASSEMBLY5. DISASSEMBLY 26. Bolts with washer 3 pcs 27. X-feed motor assy5. DISASSEMBLY 44. Bolts 10 pcs 45. Flat screws 8 pcs 46. Feed bracket47. Bolts 16 pcs 48. X-LM guide 2 pcs 49. Bolts 2 pcs 50. X-belt holder 51. X-belt holder plate 52. Bolts 2 pcs5-10. Work clamp lifter mechanism Solenoid specifications 5. DISASSEMBLY5108Q 5-11. Work clamp lifter mechanism Pneumatic specifications 5. DISASSEMBLY5-12. Tension release mechanism 5-13. Intermittent presser foot lifter mechanism5. DISASSEMBLY Solenoid setting plate5-14. Thread trimmer mechanism 5. DISASSEMBLYThread trimmer collar 5-15. Shuttle hook mechanism 5. DISASSEMBLY6. ASSEMBLY 6-1. Thread trimmer mechanism6. ASSEMBLY 6. ASSEMBLY Apply greaseBolts with washer 2 pcs 4853Q6-2. Intermittent presser foot lifter mechanism 6-3. Tension release mechanism6. ASSEMBLY Stepping clamp lifter rod adjustment6-4. Work clamp lifter mechanism Solenoid specifications 6. ASSEMBLYIndex mark 6. ASSEMBLY Work clamp lifter plate assyAlign 5162Q6. ASSEMBLY Hook the spring into the arm hole as shown in the illustration6-5. Work clamp lifter mechanism Pneumatic specifications 6. ASSEMBLY5168Q 5169Q6. ASSEMBLY 5170Q5171Q 5172Q6-6. Feed mechanism 6. ASSEMBLY6. ASSEMBLY Flat screws 8 pcs5176Q 5215Q6. ASSEMBLY 5178Q5179Q 6. ASSEMBLY Install so that the backlash is 0.01Install so that the backlash is 0.01 53. X-feed motor assy 54. Bolts with washer 3 pcs Temporarily tighten6. ASSEMBLY X-GT belt tension adjustmentMeasurement position 6. ASSEMBLY Y-GT belt tension adjustment 5184Q6. ASSEMBLY Inside X-LM guide installationRight Y-LM guide installation 5185Q6-7. Feed covers 6. ASSEMBLY6. ASSEMBLY Needle plateBAS-311G, BAS-326G 5191Q6-8. Upper shaft mechanism 6. ASSEMBLY6. ASSEMBLY Install the motor assembly so that the harness is facing downward6-9. Needle bar mechanism 6. ASSEMBLYInside hole 6. ASSEMBLY 18. Needle bar clamp 19. Needle bar Insert from above 20. Screw6-10. Intermittent presser foot lifter mechanism 6. ASSEMBLY6. ASSEMBLY 3. Lower the needle bar approximately 6.5 mm from its highest position6-11. Lower shaft mechanism 6. ASSEMBLY6. ASSEMBLY Check that the machine pulley turns smoothly 12. Lower shaft assy6-12. Shuttle hook mechanism 6-13. Thread trimmer mechanism6. ASSEMBLY connecting plate6-14. Work clamp arm mechanism Pneumatic specifications6. ASSEMBLY 1. Feed plate 2. Bolts with washer 2pcs 3. Work clamp assy6-14-1. Adjustments after work clamp arm installation 6. ASSEMBLYRetainer adjustment Work clamp height adjustment Solenoid specifications6-15. Thread wiper mechanism 6. ASSEMBLY6-16. Covers 6. ASSEMBLY5154Q 7. ADJUSTMENT 7-1. Checking the machine head switch7. ADJUSTMENT 7-2. Standard thread tension 7-2-1. Upper and lower thread tension7. ADJUSTMENT 7-2-2. Thread take-up spring 7-2-3. Arm thread guide R7. ADJUSTMENT Thread take-up spring height7-3. Adjusting the needle bar height 7-4. Adjusting the needle bar lift amount7-5. Adjusting the driver needle guard 7. ADJUSTMENT7-6. Adjusting the needle clearance 7-7. Adjusting the shuttle race thread guide7-8. Rotary hook lubrication amount 7. ADJUSTMENT7-9. Adjusting the position of the movable knife 7. ADJUSTMENT7. ADJUSTMENT 7. Turn the pulley 1 by hand to move the needle bar to its lowest position7-10. Replacing the movable and fixed knives 7. ADJUSTMENT7-10-1. Installing the feed plate 7. ADJUSTMENTEnd feed plate installation mode All indicators switch off7-11. Adjusting the thread wiper 7-12. Presser foot installation position7. ADJUSTMENT 7-13. Changing the intermittent stroke 7. ADJUSTMENTChanging the installation position of stepping clamp link A 7. ADJUSTMENT Stepping clamp connecting rod position adjustment 7-14. Adjusting the work clamp lift amount 7-15. Adjusting the air pressure pneumatic specifications7. ADJUSTMENT Solenoid specifications7-16. Adjusting the thread trimmer cam position 7-17. Belt tension adjustment7. ADJUSTMENT X-GT belt7-18. Adjusting the tension release amount 7. ADJUSTMENT Y-GT belt7-19. Adjusting the backlash of the lower shaft gear 7. ADJUSTMENT7-20. Adjusting the home position 7-20-1. Work clamp lift home position7. ADJUSTMENT Solenoid specifications7-20-2. X-Y feed home position 7. ADJUSTMENTRepeat steps 4 and 5 to adjust the home position End adjustment mode7. ADJUSTMENT Repeat steps 5 and 6 to adjust the home positionEnd adjustment mode 5208Q 5276Q7-21. Adjusting the needle up stop home position 7. ADJUSTMENT5209Q 4700Q7-22. Adjusting the needle up stop position 7. ADJUSTMENTAdjustment method 7. ADJUSTMENT End adjustment mode8-1. Precautions while carrying out adjustments 8. ELECTRICAL MECHANISMDANGER 8. ELECTRICAL MECHANISM8-2. Inside the control box and operation panel structure Power supply motor P.C. board8. ELECTRICAL MECHANISM Main P.C. board8-3. Description of fuses 8. ELECTRICAL MECHANISM4590Q 8-4. Description of connectors 8-4-1. Connector positions8. ELECTRICAL MECHANISM Main P.C. boardPower supply motor P.C. board 8. ELECTRICAL MECHANISM PMD P.C. boardBAS-311G, BAS-326G 4592Q8. ELECTRICAL MECHANISM Panel P.C. board BAS-311G, BAS-326G4594Q 8-4-2. Symptoms when there are poor connections 8. ELECTRICAL MECHANISMFeed mechanism Work clamp mechanism8. ELECTRICAL MECHANISM Thread trimming mechanismSewing operations 4713Q 5243Q 4714Q8. ELECTRICAL MECHANISM Other5245Q 5246Q 5247Q 5248Q 5249Q 8-5. Troubleshooting 8-5-1. Diagnosis flowchartDescription of symbols “Problem” symbol in the “8-5-2. Remedy” lists8. ELECTRICAL MECHANISM BAS-311G, BAS-326G5251Q 8. ELECTRICAL MECHANISM BAS-311G, BAS-326G5252Q 8. ELECTRICAL MECHANISM BAS-311G, BAS-326G5253Q 8-5-2. Remedy Before carrying out adjustmentDANGER 8. ELECTRICAL MECHANISM8. ELECTRICAL MECHANISM 4876Q4877Q 4878Q8. ELECTRICAL MECHANISM 8. ELECTRICAL MECHANISM 8. ELECTRICAL MECHANISM 5086Q5087Q 8. ELECTRICAL MECHANISM 4885Q8. ELECTRICAL MECHANISM 4886Q4884Q 8. ELECTRICAL MECHANISM Work clamp does not rise4888Q 8. ELECTRICAL MECHANISM 8. ELECTRICAL MECHANISM 8. ELECTRICAL MECHANISM 8. ELECTRICAL MECHANISM 8. ELECTRICAL MECHANISM 4889Q4890Q 4891Q8. ELECTRICAL MECHANISM 5088Q5089Q 4892Q9. TABLE OF ERROR CODES 9. TABLE OF ERROR CODESSwitch-related errors DANGER9. TABLE OF ERROR CODES Upper shaft motor-related errors Feed mechanism-related errorsWork clamp-related errors E1109. TABLE OF ERROR CODES Communication and memory-related errorsE401 E4029. TABLE OF ERROR CODES Data editing-related errors Device-related errorsP.C. board-related errors E50010. TROUBLESHOOTING 10. TROUBLESHOOTINGProblem Cause10. TROUBLESHOOTING ProblemCause Remedy10. TROUBLESHOOTING Problempower is turned on and switch11. 7-SEGMENT DISPLAY 11. 7-SEGMENT DISPLAYBAS-311G, BAS-326G SERVICE MANUAL Printed in JapanI5060885B 2005.07. B