Brother BAS-341F, BAS-342F, 342Fi instruction manual Lower thread tension Upper thread tension

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5. CORRECT USE

5-6-2. Lower thread tension

5-6-3. Upper thread tension

Weaker

(1)

Stronger

Stronger Weaker

0112S

Weaker

Stronger

1937S

Set the lower thread tension to as weak a tension as possible and so that the bobbin case drops by its own weight when the end of the thread is held. Turn the adjusting screw (1) to adjust the tension.

Note

If the lower thread tension is too weak, it may not be possible to cut the lower thread properly during thread trimming.

5-6-4. Thread take-up spring height

Lower

Higher

1938S

Loosen screw (4) and turn the entire thread take-up unit to adjust so that the height of the thread take-up spring is 8 - 10 mm

Turn the tension nut (2) (main tension) to adjust the tension as appropriate for the material being sewn.

Furthermore, turn the thread nut (3) (sub-tension) to adjust the remaining length of upper thread to 35 - 40 mm.

5-6-5. Thread take-up spring tension

Stronger

Weaker

1939S

Adjust the thread take-up spring tension by turning the tension stud (5) with a screwdriver.

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BAS-341F, 342F

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Contents BAS-341F BAS-342F Safety Instructions Safety indications and their meaningsInstallation Environmental requirementsSewing CleaningMaintenance and inspection 1971S Contents Changing Special Functions BAS-342F Name of Each PartsBAS-341F Specifications NeedleBefore setting up PreparationPositioning Tilting the sewing machine headBelt tension Connecting the ground wireInstalling the foot switch Installing the spool stand Installing the programmer optionAdjusting the air pressure Lubrication Lubrication pointsInstalling the needle and running the sewing machine Correct USESelecting the needle and thread To turn the pulley by hand Threading the upper thread Winding the lower thread Replacing the bobbin case and threading the thread Sewing conditions and thread tensionLower thread tension Upper thread tension Pretension tension Using the Operation Panel Explanation of panelIndicator Switch Using the floppy disk Compatible types of floppy diskSetting the floppy disk How to use the cleaning diskUsing the program R/W Read/Write switch If an error message is displayedClearing the error To Read a pattern to memoryUsing the Test switch Checking the sewing pattern Resuming operation from a stopping poingUsing the emergency stop switch Continuing sewing from a stopping pointAdjusting the sewing Speed control Changing the X-SCALE and Y-SCALE settingsUsing the bobbin thread counter Using production counter Using single split mode Shifting a stitch pattern Sewing operation SewingBefore starting sewing 1942S Lubrication Maintenance and InspectionCleaning the shuttle hook Cleaning the control box air inlet port Draining the oilCleaning the eye guard Checking the needleAdjusting the needle bar height Adjusting the needle bar lift amountAdjusting the shuttle race thread guide Adjusting the needle clearanceAdjusting the driver needle guard Adjusting the movable knife Replacing the movable and fixed knivesMovable knife Presser foot adjustment Adjusting presser foot lift to 3 5mm Adjusting presser foot lift to 5 8 mmChanging the presser foot lift Standard presser foot lift is 3 mm max mmAdjusting the wiper Adjusting the needle up stop positionChecking the input sensor and DIP switch input Clearing all memory settings Checking the input voltageDIP Switch Panel DIP switch functionsFeeding speed is switched to high speed DIP switches inside the control box DIP Switch Changing Special Functions and Using the Memory Switches Memory switches 00 0F Switch No When on Memo-10 Memory switches 20 2F Extended option outputSwitch No Possible Units Error Codes Error codes E.9 * E.F Gauge Parts List According to Subclasses Plate blank Troubleshooting Incorrect needle and shuttle hook timing Turn the sub-tension nut To adjust the tension Adjust the sub tension Sharpen or Replace Fixed knife Option Needle thread presser deviceAir wiper device 15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. Phone