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I just found your question, so I'll try to help you, you said you just had the machine serviced and it's still showing the error 88, is this error why you took the machine in to be serviced for? if it is then I suggest taking the machine back to the repair shop and tell them it wasn't fixed correctly. I've had other people say that they've took their machine in to be fixed and then brought the machine home and it still had the same problem so that means that they didn't fix the machine .. have you tried changing the needle--needle that is correct for the fabric being sewed try rethreading the machine top and bobbin also try using a different bobbin make sure the top thread has not come off the thread take up lever make sure the top thread is not wound around the spool pin make sure the bobbin is turned the correct way do you have a manual for the machine?
The needle thread breaks
1. the needle thread is not threaded properly
2. The needle thread tension is to tight
3. The needle is bent or blunt
4. The needle is incorrectly inserted
5. The needle thread & the bobbin thread are not set under the presser foot when starting to sew
6. the threads were not drawn to the rear after sewing
7. The thread is either to heavy or to fine for the needle
As a general rule, domestic machines don't like buttonhole twist, that heavy yellow thread you see on the RTW jeans. Sometimes you can put it through the bobbin but use a regular weight thread on top but this means sewing upside down as you'll want the yellow on top. And lots of machines dont like different weight thread top and bottom so it just makes for awful stitching anyway.
Best solution to top stitch jeans is use a regular weight thread, large size jeans needle but thread up two spools of thread on the top with both threads going through the same needle eye. It still may not solve the problem though.
To your machine, firstly change the needle as it may be bent. Then unthread the machine and manually turn the flywheel through a stitch cycle and listen carefully, if you still hear a noise as the needle touches the rotary hook, you've knocked the timing out. Service man visit time.
Probably if you check the manual, it will say 50 weight thread, and you'll need to stick with that in the future.
Those big industrial sewing machines that they top sew jeans on are very different to a domestic SM, many make a chain stitch or fell the jeans seams and are very heavy duty.