Roland D-50 - invalid sounds (noise, creaking, cracking)

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Jeeper73
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Re: Roland D-50 - invalid sounds (noise, creaking, cracking)

Post by Jeeper73 » Wed Jan 21, 2015 10:11 pm

I removed from D-550 DAC and put socket (for convenience).

Then I put in the D-550 invalid DAC from D-50 (which is the "native") - module D-550 works fine and perfectly sings all patches :D
Then I put in the D-550 good DAC from D-50 (which was replaced with instead faulty DAC) - module D-550 also works great and sings all the patches.
:lol:

What is the "catch" ? It turns out the previous owner in vain has replaced the DAC.
What fault then?

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Re: Roland D-50 - invalid sounds (noise, creaking, cracking)

Post by db0451 » Thu Jan 22, 2015 12:23 pm

So, as I have indicated multiple times, it seems like it might not be the DAC that is causing the problem. Check some other things.

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Re: Roland D-50 - invalid sounds (noise, creaking, cracking)

Post by Jeeper73 » Fri Jan 23, 2015 9:37 pm

Hello everyone !

Dear friends, you could advise me in detail to verify the memory - IC1-IC6. Here is the datasheet for the memory -
uPD41416C-12 :oops: :?:
And probably Roland D-550 is very useful in this process - she's (memory) the same (you can compare the voltage waveform, for example) :idea:

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Re: Roland D-50 - invalid sounds (noise, creaking, cracking)

Post by Jeeper73 » Tue Jan 27, 2015 11:05 pm

"Surprise" crept unnoticed - on board Roland D-550 instead of the expected uPD41416C-12 proudly sticking MB81416-10 - http://www.datasheets360.com/pdf/-4276417536693949486 :shock:
It seems to be the same, but porastoropnee - 100ns instead of 120ns.

What to do? I'm not going to change all six chips :?:

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Re: Roland D-50 - invalid sounds (noise, creaking, cracking)

Post by ninja6485 » Tue Jan 27, 2015 11:40 pm

Jeeper73 wrote:I have a faulty Roland D-50 - instead of sounds gives some noise, creaking, cracking. Some patches can be identified, but if you really-really listen.
Just a random crazy thought, did you check the volume slider? Mine does something like that occasionally, especially with one channel. I have to fiddle with the volume slider: it doesn't like to be at the very top, but slightly lower, and sometimes if you just tap it it goes out again. Could the faint sounds you're hearing be a result of a problem like that, and the noise, creaking and crackling be the noise floor?
This looks like a psychotropic reaction. No wonder it's so popular...

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Re: Roland D-50 - invalid sounds (noise, creaking, cracking)

Post by Jabberwalky » Wed Jan 28, 2015 1:08 am

My Dx7 would do something similar to what Ninja experienced. I ended up just hard wiring it 100% since the slider doesn't seem to exist anymore.

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Re: Roland D-50 - invalid sounds (noise, creaking, cracking)

Post by synthroom » Wed Jan 28, 2015 6:09 am

Jabberwalky wrote:My Dx7 would do something similar to what Ninja experienced. I ended up just hard wiring it 100% since the slider doesn't seem to exist anymore.
Interesting, a DX-5 I have seems to have a dead spot in it.
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Re: Roland D-50 - invalid sounds (noise, creaking, cracking)

Post by Jeeper73 » Wed Jan 28, 2015 9:51 am

No, dear ninja6485, Jabberwalky and synthroom, - it is not a fader, because
the keyboard has played very little - she was lying on the shelf longer than previously used.
The reason is not fader. You read my thread on the first page, I described everything ;)

I probably still first check IC11, IC17 and IC12, before changing memory.
Right now I do not have such chips, otherwise I would have done it.

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Jeeper73
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Re: Roland D-50 - invalid sounds (noise, creaking, cracking)

Post by Jeeper73 » Thu Jan 29, 2015 10:59 am

Hello.

I checked the IC12 - OK. More remains to verify the IC17 and IC11 - just change, they are cheap. Then deal with memory (IC1-IC6).

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Re: Roland D-50 - invalid sounds (noise, creaking, cracking)

Post by Jeeper73 » Sat Jan 31, 2015 10:51 pm

Well - IS17 has proven to be an "alibi" :)

Yes ... SMD-body of SO16 format much "thinner" since the '80s - "narrowed" wide by a millimeter (3.9 vs. 5), and the findings have also become shorter :shock:
If "native" SMD-chip is completely covered their findings designed place to put it, it falls short of the modern tracks on 0.5 mm on each side. Had some trouble to solder ;)

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Re: Roland D-50 - invalid sounds (noise, creaking, cracking)

Post by Jeeper73 » Tue Feb 17, 2015 11:12 pm

Welcome all !

The repair is complete, synthesizer again sings "like a nightingale" ;)
I was helped by a master from another forum - skx from REMONT-AUD.NET

Under IC8 (chorus) inexplicably "stuck" to multiple address tracks a piece of solder and formed something like a resistor :shock:
And ordinary magnifying glass to see such a defect was impossible, and to have helped in this case micro-video-cam.
Extract this piece of solder was not possible, so I had to unsolder IC8. After the liquidation of "catastrophe" IC8 was returned to the place.

Such was breaking :D

Moderators, issue has been resolved and the topic can be closed.

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