S-1110A
11. TROUBLESHOOTING
23
Problem Possible
cause
Page
5 Skipped stitches at sewing
start
Thread unravelling at
sewing start
y
Is the thread take-up lever at its highest position at the sewing start?
Set the thread take-up lever to its highest position at the sewing
start.
y
Is the length of the upper thread trailing from the needle hole too
short?
Pull about 50 mm of thread through the needle hole at the
sewing start.
y
Is the thread take-up spring tension too strong?
Reduce the tension of the thread take-up spring.
y
Is the thread take-up spring operating range too large?
Lower the position of the thread take-up spring.
y
Is the needle too wide?
Try using a needle with a count that is one lower than the
current needle.
11
11
16*
16*
6 Uneven
seam
y
Is the presser foot pressure too weak?
Adjust the presser foot pressure.
y
Is the feed dog too low?
Adjust the feed dog height.
y
Is the bobbin scratched?
If the bobbin is damaged, smooth it with an oiled grindstone or
replace it.
14
18*
*
7 Large degree of puckering
(excess tension)
y
Is the upper thread tension too strong?
Make the upper thread tension as weak as possible.
y
Is the lower thread tension too strong?
Make the lower thread tension as weak as possible.
y
Is the needle tip blunt?
Replace the needle if it is blunt.
y
Is the needle too thick?
Replace with as thin a needle as possible.
y
Are the thread take-up spring tensions too strong?
Make the thread take-up spring tension as weak as possible.
y
Is the thread take-up spring operating range too large?
Lower the position of the thread take-up spring to as low a
position as possible.
y
Is the presser foot pressure too strong?
Adjust the presser foot pressure.
y
Is the sewing speed too fast?
Reduce the sewing speed slightly.
y
Is the angle of the feed dog correct?
Tilt the front of the feed dog down slightly.
13
13
16*
16*
14
18*
8 Material
slippage
y
Is the presser foot pressure too strong?
Adjust the presser foot pressure.
14
0749M
0473M
0978M
0750M
