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 Forum index » Instruments and Equipment » General Discussion
Help with Yamaha e70
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mikewalter



Joined: Mar 05, 2013
Posts: 5
Location: Venezuela
Audio files: 1

PostPosted: Tue Mar 05, 2013 8:11 am    Post subject: Help with Yamaha e70
Subject description: SERVICE GUIDE ANALYSIS FOR YAMAHA ELECTONE PAS
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Hi,
is there by chance another SERVICE GUIDE ANALYSIS FOR YAMAHA ELECTONE PAS for sale?
Or can you give me a copy of it? I have an e70 with serious problems and want to solve the but technicians haven´t been able to. Anyone that can help me with an e70 problem? sound in flutes are failing. Lower notes have no volume but it increases with higher notes. My guess is that notes are contructed with armonics sounds but some are missing, the lower ones. Is this crazy? Some idea where should we check? The yamaha technician hasn´t been able to solve it.
Thanks
Michael
mleydar@cantv.net
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johncronan



Joined: Feb 24, 2013
Posts: 42
Location: Chicago

PostPosted: Thu Mar 28, 2013 4:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hmm, I suppose your tech should really be looking at materials on the CS-80 since this synth is derived from that one. They use the same circuits (almost).

Quote:
My guess is that notes are contructed with armonics sounds but some are missing, the lower ones.

Well, close! You start with a harmonic-rich signal and take out the ones you don't want, generally. So perhaps your problem has to do with a stuck high-pass filter. If it happens for all voices than I would suspect the filter key tracking circuit. But really, you'd need to describe the problem in a lot more detail for one to even guess.

Hope that helps! -John
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johncronan



Joined: Feb 24, 2013
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Location: Chicago

PostPosted: Thu Mar 28, 2013 11:59 pm    Post subject: Re: Help with Yamaha e70
Subject description: SERVICE GUIDE ANALYSIS FOR YAMAHA ELECTONE PAS
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mikewalter (PM) wrote:
When you use the 1, 2 and 3 pistons, the organ seems to work fine, but as soon as you cancel and tried to use the 16th flute, the volume is very poor in two keyboard and the pedal. It increases with the higher notes. That is my guess that lower notes has lost some of the harmonics, i don´t know if this is the right name.

So it sounds not only too quiet but also thin (meaning bass light or, if you like, "tinny")?

If you hold down a higher note and then play a low one, does it still happen? What if you hold 3 or 4 or 5 and then press a low note? The result for what the low note sounds like is the same?
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mikewalter



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Location: Venezuela
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PostPosted: Fri Mar 29, 2013 5:01 am    Post subject: A test
Subject description: video
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Hi, this is a video that a made for a friend in usa thta is trying also to help.


video 01.avi
 Description:

Download
 Filename:  video 01.avi
 Filesize:  4.51 MB
 Downloaded:  439 Time(s)

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johncronan



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PostPosted: Fri Mar 29, 2013 12:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

Did you play it on the 16' setting in the video?
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mikewalter



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PostPosted: Fri Mar 29, 2013 1:19 pm    Post subject: Hi
Subject description: answer
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yes, i set up for the upper, lower and pedal just the 16th flute. when you use the other flutes it seems to gain more volume. but still not enough as when you use ther preset 1, 2 and 3.
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johncronan



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PostPosted: Fri Mar 29, 2013 2:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

It's still difficult for me to tell (a recording of a very slow legato glissando would be helpful).

But, I don't think this is in the VCA so it looks like maybe it is the high-pass filter.

What about my second question?
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mikewalter



Joined: Mar 05, 2013
Posts: 5
Location: Venezuela
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PostPosted: Sat Mar 30, 2013 9:07 am    Post subject: Second question
Subject description: Answer
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Hi,
The second question:
I tried that and the volume is the same in the lower and upper notes, same in the upper and lower keyboard. I was playing chord on the higher notes and playing a melody on the lower notes. No difference in the volume.

Yesterday, I began a blog about this so i can compile all the info that I have.
http://walterscocozza.blogspot.com/

Just in a couple a days i will have all the info there.
Bye
Mike
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johncronan



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Posts: 42
Location: Chicago

PostPosted: Sat Mar 30, 2013 3:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

Okay, I think I was probably on the wrong track. It's weird that the preset pistons work normally.

I wish I knew more about how organ consoles map to synthesizer controls!

These things have a control voltage mixer for the filter cutoff frequency - the problem could be in there. But I think you should try to listen to the output of the voice board mix before it goes into the ring modulator. This might be labeled "O1" on the "PRA" board, according to the CS-80 block diagram I'm looking at. If it sounds normal there than there's some failure in the final stages.
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mikewalter



Joined: Mar 05, 2013
Posts: 5
Location: Venezuela
Audio files: 1

PostPosted: Sun Mar 31, 2013 6:43 am    Post subject: Hi
Subject description: Some videos
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Hi,
I uploaded almost all of the videos. I`m including also some with voltage checking, etc. If you don´t have a e70 service manual, it can be downloaded from the net. Let me know and i`ll give you the link.
Bye
Mike


http://walterscocozza.blogspot.com/
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