8. ELECTRICAL MECHANISM

Problem #17 Intermittent presser foot does not drop during sewing.

Cause

 

Inspection/Remedy/Adjustment

Replacement if a malfunction

2. If the presser foot does not

1)

Disconnect connector P9 (POWER1) from

PMD P.C. board, or power

operate and [E300] is displayed,

 

the PMD P.C. board and measure the

supply motor P.C. board

there is a malfunction of the

 

resistance between pins 1-2 at connector P9.

 

PMD P.C. board or of the power

 

OK if ∞ Ω; if 0 Ω, there is a malfunction of

 

supply motor P.C. board.

 

the PMD P.C. board.

 

 

2)

Measure the resistance between the fuse F2

 

 

 

terminal that is close to P6 (MAIN) and pin 2

 

 

 

of connector P7 (PMD) on the power supply

 

 

 

motor P.C. board. (D10 check)

 

 

 

OK if ∞ Ω

 

 

3)

Disconnect connector P9 (POWER1) from

 

 

 

the PMD P.C. board, and then measure the

 

 

 

voltage between pins 1-2 of the cord-side

 

 

 

connector.

 

 

 

OK if approx. +100 V

 

 

 

After measuring, turn off the power, wait 5

 

 

 

minutes or more and then insert P9.

 

 

4)

Disconnect connector P2 (POWER2) from

 

 

 

the PMD P.C. board, and then measure the

 

 

 

voltage between pins 1-2 of the cord-side

 

 

 

connector.

 

 

 

OK if approx. +16 V

 

 

 

After measuring, turn off the power, wait 5

 

 

 

minutes or more and then insert P2.

 

 

5)

Check that connector P1 (MAIN) is inserted

 

 

 

into the PMD P.C. board.

 

4884Q

 

 

 

 

 

 

 

3. If the presser foot moves slightly

1)

Check that connector P5 (P-ENC) is inserted

Pulse motor P assembly

and then [E300] is displayed,

 

into the main P.C. board.

 

there is a malfunction of the

2)

Check the encoder input while referring to

 

encoder.

 

“2-8. Input checking method”.

 

4. If the presser foot operates and

1)

Check that connector P8 (SENSOR1) is

Work clamp home position

[E300] is displayed, there is a

 

inserted into the main P.C. board.

sensor

malfunction of the work clamp

2)

Check the work clamp home position sensor

 

home position sensor.

 

input while referring to “2-8. Input checking

 

 

 

method”.

 

 

3)

If a metallic object is brought close to the

 

 

 

work clamp home position sensor and the

 

 

 

LED inside the sensor does not illuminate,

 

 

 

there is a malfunction of the sensor.

 

 

4)

If it illuminates, the home position dog is

 

 

 

incorrectly adjusted.

 

 

 

Switch to home position adjustment mode,

 

 

 

and adjust the position of the home position

 

 

 

dog. Refer to “7-20. Adjusting the home

 

 

 

position”.

 

132

BAS-311G, BAS-326G

Page 139
Image 139
Brother BAS-311G service manual 132

BAS-311G specifications

The Brother BAS-311G is a state-of-the-art industrial sewing machine designed specifically for advanced garment manufacturing. This high-speed, fully automated model is engineered to meet the demands of modern production environments, offering exceptional performance and versatility.

One of the key features of the BAS-311G is its automatic thread trimmer, which significantly reduces downtime and enhances productivity. This machine is capable of cutting the thread at the end of each seam, ensuring a clean finish and minimizing the need for manual intervention. This feature is especially beneficial in high-volume production settings where efficiency is paramount.

The BAS-311G also boasts an advanced automatic needle positioning system, allowing users to set the needle to stop in the up or down position. This functionality enhances control over the sewing process, making it easier to pivot and maneuver fabric, which is crucial for intricate designs and patterns. This precision is a boon for manufacturers looking to improve the quality of their finished products.

Another notable aspect of the BAS-311G is its versatility. The machine is equipped with an adjustable stitch length feature, enabling users to customize stitches according to specific project needs. This flexibility allows for the production of a wide range of garments, from delicate fabrics to thicker materials, making it suitable for various industries including fashion, sportswear, and workwear.

In terms of technology, the BAS-311G incorporates Brother's pioneering technology that ensures smooth and reliable operation. The machine includes a digital control panel, which simplifies the selection of stitch patterns and settings. Users can easily navigate through options, making adjustments on the fly, which is crucial in a fast-paced production environment.

Built with durability in mind, the BAS-311G is engineered for heavy-duty use with high-quality materials that withstand the rigors of daily operation. Its robust construction ensures longevity and sustained performance, making it a wise investment for businesses seeking reliable machinery.

In summary, the Brother BAS-311G is an excellent choice for manufacturers looking to enhance their sewing operations. With features such as automatic thread trimming, adjustable stitch lengths, and advanced technology integration, it stands out as a top-tier industrial sewing machine designed to improve efficiency and quality in garment production.