12. TROUBLESHOOTING
27
DA-9280
12. TROUBLESHOOTING
x
If there is a problem with operation, first check that the threads are correctly threaded and that the needle is correctly installed.
x
Please check the following points before calling for repairs or service.
x
If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of
purchase.
CAUTION
Turn off the power switch and disconnect the power cord from the wall outlet before carrying out troubleshooting.
The motor will keep turning even after the power is switched off as a result of the motor’s inertia. Wait until the motor stops
fully before starting work.
The machine may operate if the treadle is depressed by mistake, which could result in injury.
Problem
Cause
Remedy
Page
The upper thread tension is too weak.
Adjust the upper thread tension.
14
The lower thread tension is too strong.
Adjust the lower thread tension.
14
The position of the upper thread take-up
guide is incorrect.
Adjust the upper thread take-up guide
position correctly.
22
The lower thread tension plate clearance
of the upper thread nipper is incorrect.
Adjust the lower thread tension plate
clearance of the upper thread nipper
correctly.
22
1.
Upper thread is not
tight.
The tension release lever position is
incorrect.
Adjust the tension release lever position
correctly.
!
22
The needle is not properly installed.
!
Install the needle correctly.
11
The looper points are dull.
Replace the loopers with good ones.
19
The needle and looper timing is incorrect.
Adjust the needle and looper timing
correctly.
19
The clearance between the needles and
loopers are incorrect.
Adjust the clearance between the needles
and loopers correctly.
20
2.
Skipped stitches occur
while sewing
The lower thread take-up timing is
incorrect.
!
Adjust the lower thread take-up timing
correctly.
!
23
The puller timing is incorrect.
!
Adjust the puller timing.
!
24
The puller feed is incorrect.
Adjust the puller feed.
15
The presser foot pressure is incorrect.
Adjust the presser foot pressure.
14
3.
Seam position is
incorrect.
(Machines with puller)
The feed dog height is incorrect.
Adjust the feed dog height.
21
The sub-feed dog height is incorrect.
!
Adjust the sub-feed dog height.
21
The presser foot pressure is incorrect.
Adjust the presser foot pressure.
14
4.
Seam position is
incorrect.
The feed dog height is incorrect.
Adjust the feed dog height.
21
1541B
www.ae-sewingmachines.co.uk
