Brother International BAS-311F-0 Instruction Manual - English - Page 76

rotary hook timing., Incorrect needle

Get Brother International BAS-311F-0 PDF manuals and user guides View all Brother International BAS-311F-0 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 76 highlights

Problem Cause Check 14. TROUBLESHOOTING Remedy Page Upper thread breaks. Upper thread tension is too strong. Upper thread tension Adjust the upper thread tension. 25 Needle is installed incorrectly. Needle direction Install the needle so that the groove is facing forward. 21 Thread is too thick for the needle. Thread and needle Use the correct thread for the needle. 21 Thread take-up spring tension and height are incorrect. Thread take-up spring tension and height Adjust the tension and height of the thread takeup spring. 25 Damaged or burred rotary hook, needle hole plate or needle. Damage or burring File smooth or replace the affected part. Thread melting (synthetic thread) Thread edge Use a thread cooling device. 21 Thread path is incorrect. Thread Pass the thread correctly along the thread path. 22 Lower thread breaks. Skipped stitches occur. Lower thread tension is too strong. Corners of needle hole plate or bobbin case are damaged. Lower thread tension Damage Clearance between needle and rotary hook tip is too great. Incorrect needle and rotary hook timing. Driver is contacting needle more than is necessary. Needle clearance Needle bar lift amount Clearance between driver and needle Needle is bent. Bent needle Needle is installed incorrectly. Needle direction Adjust the lower thread tension. 25 File smooth or replace the affected part. Adjust the needle clearance. the affected part. 43 Adjust the needle bar lift amount. 42 Adjust the driver needle guard. 43 Replace the needle. Install the needle so that the groove is facing forward. 21 Needle breaks. Needle is touching the rotary hook. Needle clearance Needle bar lift amount Needle is bent. Bent needle Needle moves about. Needle and thread Needle is too thin. Needle and thread BAS-311F-0, 311F-L, 326F-0 Adjust the needle clearance. the groove is facing forward. 43 Adjust the needle bar lift amount. 42 Replace the needle. Select the correct needle for the sewing conditions. 21 Reduce the sewing speed Use the correct needle for the material. 69

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
14. TROUBLESHOOTING
BAS-311F-0, 311F-L, 326F-0
69
Problem
Cause
Check
Remedy
Page
Thread is too thick for
the needle.
Thread and needle
Upper thread breaks.
Thread take-up spring
tension and height are
incorrect.
Thread take-up spring
tension and height
Damaged
or
burred
rotary hook, needle hole
plate or needle.
Damage or burring
Use the correct thread
for the needle.
Adjust the tension and
height of the thread take-
up spring.
File smooth or replace
the affected part.
25
21
Upper thread tension is
too strong.
Upper thread tension
Adjust the upper thread
tension.
25
Needle is installed
incorrectly.
Needle direction
Install the needle so that the
groove is facing forward.
21
Thread melting
(synthetic thread)
Thread edge
Use a thread cooling
device.
21
Thread path is incorrect.
Thread
Pass the thread correctly
along the thread path.
22
Lower thread tension is
too strong.
Lower thread tension
Corners of needle hole
plate or bobbin case
are damaged.
Damage
Adjust the lower thread
tension.
File smooth or replace
the affected part.
25
Incorrect needle and
rotary hook timing.
Needle bar lift amount
Skipped stitches occur.
Driver is contacting needle
more than is necessary.
Clearance between
driver and needle
Needle is bent.
Bent needle
Adjust the needle bar lift
amount.
Adjust the driver needle
guard.
Replace the needle.
43
42
Clearance between needle
and rotary hook tip is too
great.
Needle clearance
Adjust the needle clearance.
the affected part.
43
Needle is installed
incorrectly.
Needle direction
Install the needle so that the
groove is facing forward.
21
Needle bar lift amount
Needle breaks.
Needle is bent.
Bent needle
Needle moves about.
Needle and thread
Adjust the needle bar lift
amount.
Replace the needle.
Select the correct needle for
the
sewing
conditions.
Reduce the sewing speed
21
42
Needle clearance
Adjust the needle clearance.
the groove is facing forward.
43
Needle is too thin.
Needle and thread
Use the correct needle
for the material.
Needle is touching the
rotary hook.
Lower thread breaks.