I'm using this thread because I don't see much about the DX7S here or anywhere. I just revived one that had a blown power supply. I tried to fix it, but the transformer was bad and other issues too. I did locate a replacement for a reasonable price and recapped that one (these old Yamaha power supplies look so bad now .. .SPX90's dying all over the place).

Anyway, I updated the OS to 1.3 and replaced the battery. I also bought a ROM cartridge ($$$) and see that it has been dumped into the files section by clem in 2016. I couldn't find the Sys Ex data for it though.? Just the ROM binary dump.

I have never used one of these and it's quite complex compared to the original DX7. But if anyone wants any Sys Ex dumps or whatever I can try that. The ROM cart has a really oddball 128k x 8 mask ROM that would have been a chore to dump. So, clem did a lot of work to get that data.

Hi guys,

how much and where are u ?

Yes - I have done it with the DX100,and wrote the remote controller for Dx11/100 someplace on my commodore systems,which I don't use - just wanted to see how the remote system operated.


LEE

Yes the remote panel button commands work, although I haven't used them myself. There was a recent video of a massive DX7 controller (not Jellinghaus or any commercial ones) that an individual made himself in the 90's (?) and he confirmed that he used those commands during development. I think his final project ended up being a DX7II or DX7S controller though. Great video for it on YouTube released over the past few months if memory serves.

In my snooping around I think I found commands for reading the LCD buffer as well, but that info will require some detective work on my behalf. Probably these were used for Yamaha engineers initially.

Update: ?I found a thread ?DX7 Remote Panel Button Control with a 2016 post by Daniel Forro that answers my remote switch question. ? I can experiment with that for now.

For the DX7 IIs (v1.3 OS), do these MIDI sysex commands do the following:

hI do you have more pcb for ram 6 i am interested?

Hi Ant,

I bought 4 boards from you and finally started using them.? :)? I made one the "normal" way and have it in the case you designed.? I also made one without a case but turned the dial and switch toward the user. Great stuff!! (except for the wait time to format and load 8 banks lol).

Anyway I'm going to build up and sell the last two I have. What do I do about the STL file? Can I give that out or not? The cases are way too expensive for me to order then resell.

(2) The voltage across the battery backed SRAM supply pins should be at 5v minus the voltage drop across the diode in the path from 5v to the battery (not sure about the exact value since the circuit is more than just a diode if memory serves). So with the power on, I would expect pin 28 on those SRAMs to be over 4v, probably quite a bit over.

If you have a meter, and you do, remove the battery and test any suspect diodes with the diode checker function.

Then test continuity of the circuit from the battery to the diode, then from the diode to the sram power pins on the main board, then put the E in and check the continuity from the same point to pin 28 on the E srams.?

I don't suppose you have the parts to do an E!-ectomy?? ie. restore the DX7 to original state? Then test?

Those expansions are notorious for connection issues because many of them used the wrong style of pin for inserting into the sockets on the DX7 main board.

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Hi guys -?Sorry for the very delayed follow-up. Lots of stuff got in the way this past month. I think diode D4 is good, but I figured I'd see if you guys could confirm this.

I probably have the service notes that describe the changes. I'll have a look at home.??

I just upgraded from 1.1 to 1.3 and am in the process of changing the battery (dead!) and LCD ... the latter is an extreme PITA.? Do not attempt.

Anyone come up with the specifics of the ADP1 internals? I thought that was an interesting question a few posts back...

Probably.? Most LCD modules are compatible with a particular controller chip.

I think I've seen replacement LCD panels for them on ebay, with different colour backlights.... There's a blue backlit OLED one on at the moment - item number 223465499491, on ebay.co.uk.? You can paste an item number into the Search box.

So, yes, they are out there.? Maybe one of the sellers of replacements knows more about them.

- Andy