Yamaha Electric Piano CLP550 no keyboard output

[dkneyle]

Well it's taken me a while to get back to this project but I can confirm after finally programming a new set of the 3 eproms with the code provided here I have a working unit again.
Many thanks to all those who have contributed all this vital information.
I was able to get a read from only one of the three originals which only had a partial match to the correct code so yeah they were stuffed.

As the bloke that started all this MANY years ago, I'm so glad to learn that people are having success! BTW, I had cause to talk to Yamaha Australia about another keyboard I recently (successfully) repaired, and told the tech about what we'd achieved with getting old Clavinovas going . I told him we'd extracted the code and it was now out there in the public domain. He didn't seem the least concerned. But you may recall, Yamaha refused to give or sell me the code; they wanted ~$300 for the three ROMS.

[Haydos]

Well it's taken me a while to get back to this project but I can confirm after finally programming a new set of the 3 eproms with the code provided here I have a working unit again.
Many thanks to all those who have contributed all this vital information.
I was able to get a read from only one of the three originals which only had a partial match to the correct code so yeah they were stuffed.

[hackervnac123]

can you share the whole circuit with me. I tried removing ic12 from CVP30 and installing it and it works. But I will have to uncomment

[hackervnac123]

Can you share the changelog with me?

This chip prone to failing over time. It has 4 outputs that drive DA conversion as I remember. Times one or two or more output not working in this chip. I have done a work around for this by using some shift registers earlier. This chip have clock input from cpu and you have to alternatively drive 4 output in sequence. I'm migrated and left behind lot of my old docs, otherwise I could share full circuit. Trace inputs and outputs of the chip and you will see how it works. Finding datasheet of the old chip helps to device a plan. As I remember, 2 or 3 8bit shift registers will be help with even just one output from the faulty chip. You can input it to shift registers and take appropriate outputs from it at after right number of but shifts.

[PMD]

It supports audio decoding. XC711AO/LC9116A-105

This chip prone to failing over time. It has 4 outputs that drive DA conversion as I remember. Times one or two or more output not working in this chip. I have done a work around for this by using some shift registers earlier. This chip have clock input from cpu and you have to alternatively drive 4 output in sequence. I'm migrated and left behind lot of my old docs, otherwise I could share full circuit. Trace inputs and outputs of the chip and you will see how it works. Finding datasheet of the old chip helps to device a plan. As I remember, 2 or 3 8bit shift registers will be help with even just one output from the faulty chip. You can input it to shift registers and take appropriate outputs from it at after right number of but shifts.

[stj]

well if you found a blank it wouldnt help,
you either need a yamaha spare or one that was removed from a scrap keyboard.
did you contact yamaha-haha yet?

[hackervnac123]

but can not buy them

[stj]

it's a custom chip
https://pdf.support/6f877755/semic.s...p/LC9116A.html

[hackervnac123]

I can't find it on any online shopping platform.

[hackervnac123]

It supports audio decoding. XC711AO/LC9116A-105

[stj]

30 pins? is that even a memory device?

[hackervnac123]

is there any way to copy it

[Haydos]

Re: Yamaha Electric Piano CLP550 no keyboard output

OK, well I took the plunge and ordered a programmer which has arrived. Just waiting for the chips from overseas to turn up and we'll see how we go.

[dkneyle]

Re: Yamaha Electric Piano CLP550 no keyboard output

Thanks so much for the feedback guys. I don't know who to really ask but I'd happily pay for the supply of the programmed roms.
Failing that I guess I'll look into a good source of the chips and that programmer kit.
I've tinkered with electronics all my life but I can't see me having a use for it after doing this favour for the owner.

Send a Private Message to PMD who you will find on this thread. He's in Sri Lanka. He and I were discussing getting him to burn me some ROMs for this piano.

[Haydos]

Re: Yamaha Electric Piano CLP550 no keyboard output

Thanks so much for the feedback guys. I don't know who to really ask but I'd happily pay for the supply of the programmed roms.
Failing that I guess I'll look into a good source of the chips and that programmer kit.
I've tinkered with electronics all my life but I can't see me having a use for it after doing this favour for the owner.

[stj]

Re: Yamaha Electric Piano CLP550 no keyboard output

https://www.aliexpress.com/item/32992209964.html
if you cant get roms done for free.

[dkneyle]

Re: Yamaha Electric Piano CLP550 no keyboard output

Hi all, this has been a great combined and commited effort to sort these units out. I, too have been asked to repair one and so far it appears to be steering towards the same issue. My question is, can anyone please steer me to a reliable supplier of the correct eeprom burner and hopefully an economical one. So far ebay isn't much help. This will be a one-off.

Hi Haydos, If you reach out to some of the guys who are part of this thread they can probably burn the EEPROMs for you. That was what I was going to do if I still had the piano in my possession.

For your interest, I told the keyboard tech at Yamaha Melbourne that we'd recovered the code and it was now floating around on the internet. He's a good bloke, but he didn't seem at all concerned about their intellectual property leaking out.

[Haydos]

Re: Yamaha Electric Piano CLP550 no keyboard output

Hi all, this has been a great combined and commited effort to sort these units out. I, too have been asked to repair one and so far it appears to be steering towards the same issue. My question is, can anyone please steer me to a reliable supplier of the correct eeprom burner and hopefully an economical one. So far ebay isn't much help. This will be a one-off.

[SMDFlea]

Re: Yamaha Electric Piano CLP550 no keyboard output

Hello,

would you be willing to sell me some coded ROMs please for a faulty CLP550 I have here in New Zealand?

thank you
Chris

You don`t have to buy anything ,the ROM`s are free, see post #1 .

[aotearoa]

Re: Yamaha Electric Piano CLP550 no keyboard output

Hello,

would you be willing to sell me some coded ROMs please for a faulty CLP550 I have here in New Zealand?

thank you
Chris