14. TROUBLESHOOTING
Problem
Cause |
| Check |
| Remedy | Page |
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Unstable upper thread length
Unstable needle up stop position
Machine does not operated when power is turned on and foot switch is depressed.
Improper tension and height of thread
Improper adjustment of sub tension
Needle up stop position fluctuates.
Fixed knife is blunt.
Electrical trouble
Head position switch does not work.
Thread
sub tension
See “Unstable needle up stop position”.
Fixed knife blade
Refer to the details for [E.22] in the error code table.
Head position switch cord connection.
Switching plate position.
Head position switch is broken.
| Adjust the tension and | 25 |
| height of the thread take- | |
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| up spring. |
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| Adjust the sub tension. |
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Sharpen or replace the fixed knife.
63
Check if the cord is 11 13 disconnected.
| Adjust the position of the | 7 |
| switching plate. | |
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Replace the head position switch.
71 |
