The residue under the electrolytics was glue or some other compound used to make the board more vibration resistant. If you look up pictures of DX7 power supply boards, all of them have similar rings of crud under them. The caps may have dried out, but I don't think they leaked. You also probably knew this, but using capacitors with a higher voltage rating won't hurt anything.
Yep, I just refurbished my old DX21. After cleaning the boards with isopropyl I noticed they were coated in all this weird sticky crap. Once they dried out they were fine though.
This is maybe a bit of a tenuous tangent but,, 10 mins before your notification I got a notification from Suzanne Ciani (she is an electronic musican), Its an interview with her and John Chowning I had not heard of him but a google seach told me he invented FM Synthesis. Just thought that was a coincidence worth a mention.
People always get scared when they see the magic smoke, but more often than not it's just "rifa madness" as Dave from EEblog calls it, the rifa filter capacitors that crack and then let off their smoke. I've only changed them once in a BBC Model B PSU. I've got an OG DX7 as well, but I've got one of the third party expansion boards in mine.
Yep I've seen many smoking rifas though all the BBC's I've had I got to them before it stank the place put. However some revoxes I wasn't quick enough ! They do stink !
I did do electronics at college and then worked as an engineer for the BBC but it's always been in me but I have re learned a lot in the last few years since I got back into it
The residue under the electrolytics was glue or some other compound used to make the board more vibration resistant. If you look up pictures of DX7 power supply boards, all of them have similar rings of crud under them. The caps may have dried out, but I don't think they leaked. You also probably knew this, but using capacitors with a higher voltage rating won't hurt anything.
Yep, I just refurbished my old DX21. After cleaning the boards with isopropyl I noticed they were coated in all this weird sticky crap. Once they dried out they were fine though.
Great instructional video again Matthew more please.
Always nice when a repair is a simple fix and goes to plan!
Yes these things make me happy
That screachy noise when you closed the lid 13:46 actually reminded me of the intro to Thriller! 😅
Very interesting video Matthew.. Surprisingly the DX-7 seems to still hold it's ground in the world of digital sound reproduction.
I think it's great
The FS1R seems to be the one people go mad for when the SY99 is the best IMHO until the Montage appeared.
Ste McDonald's calender is funny as well 😂
gawd how many records does the DX7 feature on 🤣🎹🎉
Loads but possibly not Grendel :)
@@MatthewNorthMusic 🤣
DX7, Korg M1 and Jupiter 8 are probably featured on at least 70% of all 80-90's pop. This DX7 bass reminds me of Blue Monday 😊
This is maybe a bit of a tenuous tangent but,, 10 mins before your notification I got a notification from Suzanne Ciani (she is an electronic musican), Its an interview with her and John Chowning I had not heard of him but a google seach told me he invented FM Synthesis. Just thought that was a coincidence worth a mention.
Oh wow that is spooky also shows you subscribe to some quality content :)
@@MatthewNorthMusic yes, how could you think anything else?
People always get scared when they see the magic smoke, but more often than not it's just "rifa madness" as Dave from EEblog calls it, the rifa filter capacitors that crack and then let off their smoke. I've only changed them once in a BBC Model B PSU. I've got an OG DX7 as well, but I've got one of the third party expansion boards in mine.
Yep I've seen many smoking rifas though all the BBC's I've had I got to them before it stank the place put. However some revoxes I wasn't quick enough ! They do stink !
I really enjoyed watching you bring this dx7 back to life. Where did you learn your electrical skills? If I may ask. thanks
I did do electronics at college and then worked as an engineer for the BBC but it's always been in me but I have re learned a lot in the last few years since I got back into it