Yamaha D-80 Schematics

[Guest]

Hello! I'm new to the forum and want to thanks the creator of this site for such a place to go! Thank You!! </p>

Anyway, I have a Yamaha D-80U -TH with a bit of noise coming through the "mains" speaker. It makes a shhhhhhhh sound and is quite annoying. I think it may be a Filter Cap on the Amplifier. I would greatly appreciate anyone who has some schemes that I could see as to be able to possibly tackle the noise issue. Any comments or help on this matter is needed as well. Also, a note on the organ model, it is the same as the D-80 the U- TH is just a reference towards the "fancy" cabinet design. It's such a beautiful piece of equipment and sounds awesome!! Thanks to any one who can provide some advice and help!   </p>

[fredy2]

Re: Yamaha D-80 Schematics



Fillter cap is unlikely to cause the noise of that type. Filter caps being bad usually causes hum at either 60 or 120 Hz if in the USand 50 and 100 Hz in countries with 50 Hz power. Most likely it is either digitizing noise or the random pink noise associated with semiconductor amplifiers.</P>


You need to compare it to another organ of the same model to determine if it is normal for this organ. There has been a lot of discussion about these type noise on here.</P>
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[crankit]

Re: Yamaha D-80 Schematics



All yamaha schematics can be found here at http://www.wdgreenhill.com/ </p>

I bought the service schematics for my d-85 here and they sent it to my address in australia. I beleave they also have spare parts.

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[Electone]

Re: Yamaha D-80 Schematics



I can also confirm that my D-80 also makes a"SHHHHHH" sound. Ithought it was a problem, but itlooks likethese Electones just had rather noisy amplifiers. Oddly enough, the tremolo channel is dead quiet.</P>
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[Electone]

Re: Yamaha D-80 Schematics

Just a side note: I now use a Yamaha TM-5 tone cabinet with my D-80. The "shhhhh" sound is also present in the TM-5 when the D-80 is connected to it. The TM-5 is pretty silent when there is no connection to the D-80.

[andyg]

Re: Yamaha D-80 Schematics



Crikey, a D80! That takes me back a long way, playing it through a big speaker - presumably a TM5 -at a dealer's show. And yes, I can distinctly remember it being hissy, but i thought it was the speaker cabinet. Maybe it was more to do with the D80, then.</P>


Andy</P>

[FlametopFred]

Yamaha D-80 Schematics



At loud volumes (pedal to the metal, full volume on console) the
D-85 is noisy also. I think this is the nature of the beast ~
amplification was not one of Yamaha's strong points back then.
That's why I have ordered the Sevice Manuals and intend to bypass the
internal amps. I intend to tap the signal as close as possible to
the source ~ ie: take out any pre-amps or amps from the signal path,
and also have separate outs for drums, the synth, etc.</p>

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Cool to have a D-80 ... not quite sure what the differences are between D-85 and D-80 ? ?</p>

[Electone]

Re: Yamaha D-80 Schematics



Very little difference, but also quite a step up. D-85 added rhythm sequencer, rhythm fill-in, Celeste/Symphonic chorus, a better arpeggio unit, rhythmic chord, and a better speaker/amp setup. Although some new voices were added, they were the same quality. Yamaha did a mid-cycle upgrade around 1980 to its 1977 models.</p>

C-50 --&gt; C-55</p>

D-60 --&gt; D-65</p>

D-80 --&gt; D-85</p>

E-50 --&gt; E-45 (this was the oddball - they removed the E-70 style synth section. E-45 is basically a D-85 in a console style cabinet without 3rd manual)</p>

E-70 --&gt; E-75
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