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More to come, if you don't mind... My display was completely malfunctioning. But after cleaning and lubricating all the connectors, it's back to normal. (I used brake cleaner and a very small amount of silicone lubricant.) It's probably also because I properly insulated the PCB's mounting points. This prevents short circuits. As you can see in the photos, I used two layers of heat-shrink tubing. I had already done this on the first MPU, but on this one, I had to double it up. Overall, it works; the hold function and sound are still an issue. Plus a few other minor things here and there. Thanks Have a good weekend. Sorry, I can't seem to reduce the video size. Afficheur qui délire.mp4

https://www.fruit-emu.com/forums/files/file/843-topgear-1280-dx/?fbclid=IwY2xjawPqHSVleHRuA2FlbQIxMABicmlkETBpRnNnRENYRFNEeE5GcXZsc3J0YwZhcHBfaWQQMjIyMDM5MTc4ODIwMDg5MgABHpXGeV-iKxZ8YCMaTM933uYvOIHV8xr726pu7dkHQlwCE1Y_EoKpcShlwqxi_aem_XhDFX2ULw8TSZOxILnCAzA If anyone can help. if you are on FRUIT EMU. i for the life of me cant get on as cant register its calling me spam lol and saying im not welcome very odd as i was offering to pay anually. im not the only one who cant so ever runs it may want to look into it. I need this DX LAYOUT and early v ROMS (basically this link downloaded and emailed if poss to me or is it here on the mecca????? its TOP GEAR and this one seems to be the 3 pound version . i have the real machine but its the 4 pound. i love my machine and wanted to see the differences thanks and regards j sharpe showreels4u@hotmail.com

I have used a resistor before and it worked fine but less volume, if he is getting hiss I guess the speaker coil is fine, maybe ohm check the speaker or put a couple of volts across it

These speakers are practically impossible to find unless you are lucky enough to find a "new old stock " speaker or a second hand one . Bob isn't there a way to create 30ohms on a speaker with less ohms using resistors ?

For the sound it's worth checking that you're seeing the 15v on the collector of T11, if you haven't already. IC3 only delivers the basic sound bleeps, the main sounds come from IC2. Not sure which one supplies the error sounds? For the Hold button it's possibly one of the associated diodes in the switch matrix unless it's affecting other switches you may not have noticed yet. In that case it could be IC22 or one of the caps C24-28 going short. It's quite easy to fault.