Reliable 787 - Manual (Page 29)

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4. CHECKING PERFORMANCE PROBLEMS
PROBLEM PROBABLE CAUSE CORRECTION
Irregular
Stitches
Incorrect Thread Tension(s).
Incorrect size Needle.
Improper Threading.
Pulling fabric.
Loose Presser Foot.
Reset thread tension (s).
Choose correct size Needle for
Thread and Fabric.
Re-thread machine.
Do not pull Fabric; guide it gently.
Reset Presser Foot.
Breaking
Needle
Pulling fabric.
Incorrect size Needle.
Incorrect setting of Needle.
Loose Presser Foot.
Do not pull Fabric; guide it gently.
Choose correct size Needle for
Thread and Fabric.
Reset Needle.
Reset Presser Foot.
Puckering
Incorrect Thread Tension (s).
Bent or blunt Needle.
Differential feed is set
Incorrectly.
Reset Thread Tension (s).
Insert new Needle.
Set it at less than 1.
Wavering
Differential feed is set
Incorrectly.
Set it at 1 or at more than 1.
For knitted fabrics.
Skipping
Stitches
Improper Threading.
Incorrect size Needle.
Bent or blunt Needle.
Incorrect setting of Needle.
Reset thread machine.
Choose correct size Needle for
Thread and Fabric.
Insert new Needle.
Reset Needle.