HOW TO REMOVE THE THREAD GUIDE PLATE ON A JANOME HORIZON MEMORY CRAFTE 8200 QCP ... SPECIAL ADDITION

Error codes 7 and 4 on a Janome 770 QCP indicate a problem with the needle bar and/or threading mechanism. Try checking the needle bar and ensuring it is properly positioned and tightened. If the needle bar is not in the correct position, it can cause the needle to be out of center. Additionally, make sure the thread is properly threaded through the machine, including the take-up lever, needle, and thread guides. If the issue persists, you may need to consult a professional

This would be a problem with the foot control. It needs cleaning or replacing. This link says it has a maximum speed setting

Janome Horizon Memory Craft 8200 QCP Special Edition

https://www.sewingmachinesplus.com > j-8200qc-sp
Other special features include an automatic needle threader, speed controller to set your maximum sewing speed and stop / start button if you choose not to use ...

https://www.google.com/search?q=Janome+Secio+8200+over+speed

..

1. Thin material needs backing.
2. Lower foot pressure.
3. Adjust top tension to four.
4. Adjust bobbin (lower) after top tension is adjusted.
5. Increase distance of stitch.

when I pay for the CDKeys on M8X.com, how can I get it? and how to use it?

The thread could be snagging in the thread path. Remove the thread from the machine and rethread from the beginning (be sure to ALWAYS RAISE the presser foot when threading!). When I've experience this issue, the thread has usually been looped around a thread guide or the thread spool.,

You probably need an electrical adapter to convert from their power to US 110.

Machine could be out of time...the needle is arriving at the bobbin at the wrong time.

You should check with a Janome dealer if your machine can use a stitch regulator. Machines that take a stitch regulator need the ability to plug into the machine, which is not available on a lot of machines unless they have the stitch regulator function. A stitch regulator helps some people. It still takes a lot of practice moving the fabric smoothly.

On my BSR, it has an "eye" that measures the distance the fabric moves under the presser foot so it can stitch at the specified distance. The faster the fabric moves, the faster it stitches, but the stitches tend to more uniform in length.

FWIW, I read a summary of the Janome 8200 QC Horizon and there was no mention of a stitch regulator.

http://freemotionquilting.blogspot.com/2011/05/piecing-quilting-on-janome-horizon-7700.html

Did it break the needle when you changed stitches? Or did it just go straight to jamming.

I have a Janome 9000, was sewing and broke needle, replaced and broke another. I didn't have machine threaded, took out bobbin and would sew a little and stop saying thread broke. I took off top plate and started machine again, sew a little and stop saying thread broke. So I took out bobbin case and sewed again and stopped repeating the message. Everything looks OK, bobbin case and top plate. I guess I want to know if the timing could be off or do you think it is the computer part of the machine...Should I take it to the Sewing Machine Shop??