Yamaha SY77 - Changing the Battery - Restoration part 3

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The Yamaha SY77 is not reporting that the current battery is running low. It would normally report this at the point of booting up following being switched on. But I have no idea when the current battery was installed and how much life it has remaining.
So I am going to use the opportunity while I have the Yamaha SY77 open on the bench to fit a new battery. I am also going to use the opportunity to fit a battery holder to the mother board and removed the requirement to have to de-solder and re-solder the battery to the board in the future.
If you follow this video all the way through you will see that the process of changing the battery is not simple on Yamaha synthesisers and in particular this Yamaha SY77. So the battery holder will pay dividends in the future next time I have to change the battery.
Background
About 18 months, maybe 2 years ago I acquired this Yamaha SY77. It really sounded peachy, but as with many of these Yamaha synthesisers produced at the time there was an issue with the Mitsumi floppy disk drive.
So I put the synth in a box and took it down to storage while I acquired the parts that I needed to fix it. And then other things took priority.
I have just finished another project and decided to get this project through the workshop and get this synthesiser back into full operation.
The Yamaha SY77 was what I consider the natural successor to the Yamaha DX synthesiser line. Released in 1989, this synth and it's big brother the Yamaha SY99 released two years later provided the musician with FM and AWM synthesis.
The equipment mentioned above (if you can still buy it!):
Yamaha SY77 (Used): ebay.to/32RwkMb
📖Chapters:
00:00 introduction to the Yamaha SY77 Battery Change
00:12 Yamaha SY77 battery replacement way forward
00:49 Channel promotion
01:12 Removing all the connecting wires from the mother board
04:26 Removing the mother board screws
05:04 Yamaha SY77 mother board removed
05:28 Explanation about fitting a battery holder
07:55 Removing the old solder tag battery
08:39 Circuit board modifications for battery holder
09:47 Installing the new battery holder
12:37 Checking the connections
14:38 Installing a new CR2032 battery
15:50 Re-installing the mother board into the Yamaha SY77
17:46 Re-installing all the connecting wires
21:13 Completion of the battery change on the Yamaha SY77
#YamahaSY77 #YamahaSY77Restoration #SY77 #Yamaha
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Yamaha SY77 - Changing the Battery - Restoration part 3 - 2023-12-23

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26 июл 2024

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Комментарии : 9

@TheMusicTechGuyUK 7 месяцев назад

For less than the price of a cup of coffee, support the channel, join the TMTG community: themusictechguyuk.me/Community

@tuesss 3 месяца назад

I've been restoring the SY99 over the past few days so just in case someone else runs into this issue and wants a different solution: Instead of drilling a hole I soldered a wire to one of the terminals to make it longer, then shaped it as needed. Possibly a bit more fragile in theory, but in practice it feels sturdy enough so that even if a future me or someone else another 30 years from now tries to change the battery without being careful I'm pretty sure it will be fine. The upside is that it looks as if the battery holder was part of the original design and most importantly there was no drilling involved 😅 But I like your solution too, I hadn't thought about it myself. Thanks for sharing!

@TheMusicTechGuyUK 3 месяца назад

Hi @tuesss As we say in the UK. There are many ways to skin a cat. Thanks for sharing your solution to this problem. Jon

@utuber13x 7 месяцев назад

nice job, great vid. I have an sy85, one day Ill need to do the same.

@TheMusicTechGuyUK 7 месяцев назад

Hi @utuber13x Thanks for the feedback. Jon

@PhrygianPhrog 5 месяцев назад

How do you check that the battery connection is good with a multimeter? What voltage is it supposed to show?

@TheMusicTechGuyUK 5 месяцев назад

Hi @PhrygianPhrog If you want to test the battery in situ with a Multimeter you will need to locate the solder points on the board and test across them. A new CR2032 battery will read 3.2V and you would expect to get a reading between 3.2V or 3.0V if the battery is in situ. Alternatively you could use diagnostic mode (see ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-wX4u_AMU8cQ.html) and the synth will tell your the state of the battery voltage. This will never read 3.2V in my experiences, even for a new battery. It should read 3.1V or 3.0V. In any situation a reading of 2.8V and below means you need to be changing the battery. Jon

@PhrygianPhrog 5 месяцев назад

@@TheMusicTechGuyUK Great, thank you. I'm soldering a battery holder with two wires. Do I have to solder on just one side, i.e. a blob of solder on the top and put the wire into the blob? Or should I try to get the wire through the PCB and solder on the other side? (or both sides).

@TheMusicTechGuyUK 5 месяцев назад

Hi @PhrygianPhrog The solder needs to be on the pad on the circuit board, so either method would do the job. Jon