Brother DH4-B980, B981 Instruction Manual

DH4-B980, 8981

Please read this manual before making any adjustments. Please keep this manual within easy reach for quick reference.

•When replacing the cutting block with a new one, be sure to adjust the contact between the knife and the cutting block. (Refer to 3. and 4.) Poor buttonhole cutting correction flowchart

Turn off the power.

1. Adjusting the cutting pressure Note: The knife should be able to cut sufficiently if the air pressure for No the knife pressure adjustment regulator is set to 0.2 Mpa. ~-....:....:~ Note: If the cutting pressure is increased to more than 0.3 Mpa, it will cause the cutting block to become worn or the knife to become damaged. ·12. Removing and installing the cutting block I Replacing the cutting block 3. Adjusting the contact between the knife and the cutting block -=>.....;....;..;;-t (Refer to 2.)

4.1 Filing the cutting surface of the cutting block on which No the knife incision breaks off or is shifted

-====---~~~~~~~!!!!.r__~::::::=---:l Note: If the knife incision breaks off on the cutting block or is shifted, poor buttonhole cutting in the material will be the result. ~::::::---=N~o=----~4.2 Filing the cutting surface of the cutting block in which ------=.::...:.::.:.:::::..:.:..:==::.:.:.:::;;:.:;..:.- knife incision is deep

Note: If the knife incision in the cutting block is deep, it ' --.... will damage the knife. 5. Changing the knife operation time

~---;

Note: The 8981 does not have this function.

6. Replacing the knife Note: When replacing the knife with a new one, file the surface of the cutting block smooth and until the knife does not leave a mark on the cutting block.

Replace the knife

1. Adjusting the air pressure for the knife pressure

1-1. To increase the air pressure 1. Lift the knob f) of the knife pressure adjustment 2. Gently turn the knob f) and set the air pressure to 0.3Mpa. 3. Push down the knob f). 1-2. To decrease the air pressure 1. Close the cock E). The needle will remain at the high-pressure position. 2. Turn the knob screw 0 in the direction of the arrow in the illustration to loosen it. The air will escape from the reservoir and the needle will drop. 3. Tighten the knob screw 0. 4. Lift the knob 8 and turn it counterclockwise. 5. Open the cock 8. Air will enter the reservoir and the needle will move. 6. Gently turn the knob f) and set the air pressure to 0.3Mpa. . regulator 0.

To decrease To increase

To loosen ~To tighten

7. Push down the knob f). From the library of: Superior Sewing Machine & Supply LLC