Re: Yamaha Electric Piano CLP550 no keyboard output
i forgot to attach details previously. here it is.
[url]https://www.ebay.com/itm/LA104-Digital-Logic-Analyzer-4-Ch-Oscilloscope-SPI-IIC-UART-Programmable-100MHz/333332088649?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649[/url]Re: Yamaha Electric Piano CLP550 no ...e=STRK%3AMEBID
PMD
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Last Activity: 10-25-2019, 12:34 AM
Joined: 11-22-2018
Location: Colombo
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Re: Yamaha Electric Piano CLP550 no keyboard output
Hi DS, Thanks for follow-up, since im away from my home locations for a while on my job commitments, i didnt had time to do the testings on construction of daughter board. also i had ordered pocket size Ossiloscope\signal analyzer too and waiting for delivery and heard it reach my home today( witch will help me on several other works as well). so couldn't go through the test. will update no sooner i did the test!Leave a comment:
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Re: Yamaha Electric Piano CLP550 no keyboard output
Hi DS
it seems your proposal is more practical, faster and accurate except one concern. i already got parts for construct it as well, but one question arises to my mind, whether we can tap the LE and SHx signals parallel from there existing usage points??. we have to drive some extra TTL loads at our new circuit. will the IC12 output work normally with extra loads in its outputs?, we might need some extra buffers to get this done? pls advice!
i here attached a proposed design sketch. your inputs are welco...Leave a comment:
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Re: Yamaha Electric Piano CLP550 no keyboard output
Hi DS,
Congratulations on your success and Thanks for contribution to the forum! we have fully workable solution to the ROM related issues now!( except main ROM, we havent backup yet!).
Thanks for the inputs and nice timing details on SH signals where i had struck for some days. i found very simple design to create missing SH3 signal. i replicate SH3 with reference to SH0 with 5uS delay using small basic uController and expected program was below 50lines of Assembly( fast and accurate timing). i too...Leave a comment:
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Re: Yamaha Electric Piano CLP550 no keyboard output
Hi DS,
I can tell you the working combo is ROM-A(IC-10) from Ami(Post No.93) and ROM-B(IC-9) and ROM-C(IC-8) from post No.65, even errors in few intermittent Bytes wont harm anything much, but some minor tonal quality difference in occasional note in certain TONE. some times that might not noted even when playing. even without ROM-A, my system working(except sound distortion due to SH3 signal missing). so go ahead with above and should work just fine.Leave a comment:
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Re: Yamaha Electric Piano CLP550 no keyboard output
Spending on TL866II can be justifiable as it getting new patches continually and you may have many applications in the long run. i had consider it quite a time ago and finally ordered. it paid me off totally in another project same days later and now its asset for me like these cases. you will pay off once this piano repaired.
about the main ROMs, you better backup. me too will try to get it done once the multiplexer issue patch module ready. since the All ROMs belong to very older technology, main...Leave a comment:
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Re: Yamaha Electric Piano CLP550 no keyboard output
im doubt that the data stream comes to DAC might be equal or very closer to Bi-polar Zero. and no significant output generated at DAC to out from speakers. this happened to me. when im checking the my case first time, most of the keys does not produce any sound as its corresponding readings from Wave ROM are empty(or caused to generate bipolar zero output at DAC) i suppose. me too first order DAC and replace as DAC having all the valid inputs, but not giving anything out. lets see how it moves...
sometime...Leave a comment:
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Re: Yamaha Electric Piano CLP550 no keyboard output
Hi DS,
Thanks for your inspiring inputs. im not in a hurry and take your time to do the next testing when you got DAC. SH should be sample and hold and IC15 & IC16 used to sample and hold also to eliminate switching and DA glitches as both Left & Right Audio channels decoded from single DAC. IC12 they marked as SFD-2( sequential frame decoder ???), but cant find SFD-1 anywhere. Yamaha seems using more than one 16bit packet for generate tones as IC14 used at DAC output as level controller with two bit control output...Leave a comment:
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Re: Yamaha Electric Piano CLP550 no keyboard output
DS,
Thanks for your response. dont get wrong about the chip names A, B, C. i continue the previous peoples dump naming convention as i remember. but to avoid people get messed with, i have carefully name the attached files with chip name. IC number, ect. when refer the files, there wouldn't be any doubt as name correctly says what was the chip that file meant for.
i know you were going through the very systematic approach to fault finding. i went through same, and some other too before and we all replaced...Leave a comment:
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Re: Yamaha Electric Piano CLP550 no keyboard output
Hi DS, I noted, you were very observant and focus to very detailed description of the problems and behaviors of the Piano. Im certain you had the same issue of ROMs. me too getting likely issues before change ROMs. i assume ROMs had wave details of the tones also some sound effects related information's and information how to decode the bit steam to the stereo sound with some switching\multiplexing mechanism. also i guess mostly, all 3 ROMS of your Piano had issues. mainly read as zero outputs.( possibly due to disconnected pins...Leave a comment:
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Re: Yamaha Electric Piano CLP550 no keyboard output
Hi DS,
unfortunately any combination of ROMS didnt work well with my case and i eventually giveup. i was noticed one more chip in the board not getting one input directly from sort of sterio decoder signal and output was garbled. that might be the case. but Ami conforms he had succeeded with his dump plus very first upload(TL) combinations. pls try. i order 10nos of EPROMS at very low cost and done my tests. you may re-program if needed after test. i used AM27C040-120DC ordered from ebay.
[url]https://www.ebay.com/itm/10pcs-AM27C040-120DC-27C040-UV-EPROM-4M-DIP-32/251611869164?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649[/url]...Leave a comment:
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Re: Yamaha Electric Piano CLP550 no keyboard output
NO checksum printed on the chip! chip images attached...Leave a comment:
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Re: Yamaha Electric Piano CLP550 no keyboard output
Hi Ami,
I agree with your comment on ROM-A reading is defective(not everything, to some extent) and seems your Dump was Almost perfect once compare with previous, but bit suspicions of some lines in middle. anyway i already make a copy of your ROM-A dump and will check it in a day or two and will update the forum. if anyone prefer to compare BIN files, may use HexCmp-2 from [url]https://www.fairdell.com/hexcmp/[/url] (using 15 day trail version).
ROM-B i coudnt recover...Leave a comment:
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Re: Yamaha Electric Piano CLP550 no keyboard output
Hi,
I checked that you can still read the TC534000 with TL866 and its software by set the software like you reading a 27C040. due to all the pinout and reading mechanisms are same, TL866 will simply read the old TC534000 without problem(and believing its reading a 27C040) and i had do that before with TL866 and successfully read my old chips(TMP534000) and contributed remaining dumps to this forum.
pls try to dump it that way and lets cross check the images of ROM-A.
...Leave a comment:
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Re: Yamaha Electric Piano CLP550 no keyboard output
hi, i were managed to check the CLP 550 with 27C040 ROMs burn with given images. and piano is working!!. i checked the DA converter as well but it working fine. i think previous conclusion of wave ROMs are rotten is correct. even i read the two ROMs just after remove from the board but does not respond to reader few days afterward(i just wanted to read again and compare few reads to see how much consistent the contents of ROMs). but no chance now.
Quote eccerr0r:
"What do you mean by "nothing readout"...Leave a comment:
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Re: Yamaha Electric Piano CLP550 no keyboard output
I was working on my CLP550 and got replacement EPROM AM27C040 and had read my existing chips. two were readable quite well and files attached here. basically the missing image from previous attempt also recovered. but only one rom we both recovered by seems some slight differences in some areas. pls refer attached images if any one interest to some forensics. i manged to read rom A & C. third ROM was just reading first 2 or three bytes but from that point nothing readout. i dont have control over reading pulse time of data...Leave a comment:
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Re: Yamaha Electric Piano CLP550 no keyboard output
Hello friends, Thanks for the lot of effort made on the clavinova 550 so far. me too now having a unit to repair with NO sound or some strange distortions on certain key puches. so i follow the whole thread and learn alot.
i had gone through my case before read this thread and refering the circuit diagram and i was end up with decision to change the DAC chip first. but it seems i have more things to consider.
i noted the circuit of my case had not done any repair so far and problem occurred after idle...Leave a comment:
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