My beloved Memory Craft 7500 has always been a workhorse. I was mending something tonight and the foot pedal started working only sporadically. It would only do one stitch at a time, or sometimes one after two depressions. I could go stitch-by-stitch by pressing the up/down button. Do I need a new foot pedal? I have found them available online. I bought the machine new in the late '80s, so it is getting old.
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Just in case you no longer have the original user manual to do a troubleshooting check, here's a link to the Janome support page with a free download (be warned: it can be a long download time):
janome.com/
I do repair-refurb on mostly Singer mechanical machines - I'm not qualified to work on a computerised model. However, it does sound as though your foot control is going. But before you spend money on the replacement control, try cleaning the connection points on your machine AND the power cord. Hopefully it's just accumulated gunk (and it happens more often than sewers realise until it happens to them and the repair tech tells them what's happened:).
If that doesn't help, at least it won't hurt or cost you more than a few cotton swabs and some isopropyl alcohol spritzing (on the swab, not the actual connection points!).
After the cleaning, you can try the replacement control - make sure the one you buy and take delivery of matches the voltage-wattage on your original (roll the control over, there should be a plate or sticker noting the requirements, it may be on the machine right next to the connection point).
Be prepared for that not to work, however. A vintage machine, computerised or mechanical-electronic, will develop hiccups (ok, wearing out or breaking down of springs, gears, belts...) and eventually becomes a money pit, sad to say. You may be looking at spending a fair sum of money to keep it sewing, or buying a new machine when the repair bills mount up.
Best luck, I hope the fix is very simple (or inexpensive!) and you're back sewing very soon!
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