Trouble
Cause
Remedy
-
Thread tension excessively tight.
-
Adjust to proper tension.
15
-
Bobbin thread, thread take-ups, or thread
1----
Refer to section entitled "Thread ten-
15
guides incorrectly positioned.
sion".
Performs badly without
cloth (Top fancy yarn
I-
only) 8272
-
Poor needle-looper adjustment.
-
Refer to needle guard B stroke and thread
guides.
24
-
Flaw on needle plate and presser foot
1----
Use sandpaper to smooth, and then pol-
v
tongue.
ish with buffer.
-
Blunt needle point.
t--- Replace with new needle.
13
Needle holes in cloth are
-
excessively large
-
Needle is too thick for cloth.
1----
Replace with thinner needle.
13
r-
Thread too thick for needle hole.
t--- Replace with needle of proper size.
13
I-
Incorrect operation of tension disc.
-
Clean dust, etc., from tension disc in
/
order to correct operation.
Poor thread tightening
t-
I-
Poor thread guide position.
-
Refer to thread tension.
15
Needle, looper or thread take-up incor-
Refer to needle bar height, right looper
21
.._
-
22
rectly positioned.
position and thread tension.
15
r-
Thread thickness is uneven.
-
Replace with good quality thread.
v
Irregular stitches
t-
I-
Flaw in thread passage.
-
Polish thread passage until smooth.
v
.......
Thread take-ups or thread guides incor-
-
Refer to section entitled "Thread ten-
15
rectly positioned.
sion".
-58-
