Today was the day that the new 74LS374 arrived in the post. My first quick test was to put the new chip into my chip tester, and it confirmed the chip was ok whulst thebold one still reported faulty, so it looks like the chip tester might actually be trustworthy. I’ll be doing some more testing with this in the future as it could be a very handy tool.
Next step, was to get the new IC fitted and see if the issue was resolved. After powering it on i checked all the address lines and everything looked perfect! The welcome message showed up with no corruption and the DX7 was fully functional again 😀
The only thing left to do was test it out with a talented musician at the keys. Unfortunately I couldn’t find one, so you’ll have to put up with this!
Musical talents aside. I’m pretty happy with this repair, the DX7 is a great piece of music history, and it’s really nice to see it fully functional again.
I can add vintage synthesiser repair to my resume now ðŸ«
Unfortunately the DX7 has now got to go back to its owner, maybe I need to set up another watch list on eBay 🤔
Hi, Any chance you could take a look at my DX7?
I think it’s along the same lines as the fault you were talking about. I had the battery replaced, but not working properly.
I’m near Worcester but could bring it to you.
Cheers
Gez
Hi,
I would happily take a look but it would be a bit of a journey for you. Also if I was able to work out the fault, I would probably need to order parts to fix it which would take a few days to arrive. Only realistic option would be to post it, but they are not the easiest of things to post. Do you know anyone local to you with an oscilliscope?
Matt