Yamaha electone 7000 tonal problems

[JohnR]

Hi, I am really looking for information on how to repair my 7000. I always wanted one so, I found one in Chicago for a song and brought it home. It hada great sound. I made the mistake of letting a local organ technichian take a look at it.You know, to clean it up blow the dustout and fix a noisy tremolo. He fixed the tremolo with a simple abjustment but decided that the organ was out of tune and started adjusting tone ports for the upper keyboard. They were still factory set until he messed them up. Now the organ has several keys that play louder than others and the third preset which is a mixture of strings and full organ is out of balance. He can't fix it. I bought a service manual and have played around with it myself. Ihave been able to adjust it back to normal as close as I can but it is still not back to original. Someone suggested an Ocilloscope? I don't know how to use one of those. Any suggestions on how to fix this issue easily? </P>

[geoelectro]

Re: Yamaha electone 7000 tonal problems



I don't believe there IS an easy way to fix it. Having a complete understanding of how it works would certainly help. Having patience and going very slowly, you should be able with minimal tools to get it back if it's just adjustments that are off. Can you tell if the original factory settings were marked such that the adjustments could be turned back where they were? Many manufacturers do that.</p>

I have the 7000 manual but to give you any advice, I would need very specific details of what is wrong and what you want.</p>

George
</p>

[fredy2]

Re: Yamaha electone 7000 tonal problems



If the service manual calls for an oscilloscope and shows the waveforms and the adjustment sequence, then that is what you will need to restore it.</P>


Some oscilloscopes are inexpensive used, but require some knowledge to use them. They are NOT useful for accurate note frequency setting.</P>


The first thing I would do is to buy a Korg electronic tuner which run under $20 to check the actual frequency of the notes. If they are off, filters may be causing the variation in volume of certain notes. Once the notes are on frequency, thencan try to fix other things... </P>

[JohnR]

Re: Yamaha electone 7000 tonal problems

Some of the pots have been marked witha red marker. I have moved all of those back to their original poitions. They are fairly easy to adjust. You simply insert a small screw driver and turn the pot to the desired position. However, there are plenty that are not marked. So, I am having to adjust itby ear. Like I said it is almost back to normal. I just wanted to be able to reset everything back to the original settings. My service manual does have frequency settings for each pot on all of the boards. Maybe, I will have to invest in the scope to get it just perfect.

[fredy2]

Re: Yamaha electone 7000 tonal problems



Scope is to adjust filters and wave shapes. For frequency, use one of the inexpensive tuners like the Korg Chromatic... about $20 or less from Musicians Friend or Same Day Music</P>


http://www.musiciansfriend.com/produ...ner?sku=210527</P>


These work nice and are sensitive to 1 or 2 cents.</P>

[JohnR]

Re: Yamaha electone 7000 tonal problems

Thanks Fredy.I have to admit I do not possess the technical skills that you have. Do you think it is possible for someone only armed with basicskills and the desire to fix the organto pull this off? [:D] I have my doubts. Is the tuner difficult to use or learn to use?

[fredy2]

Re: Yamaha electone 7000 tonal problems



That tuner is very difficult to use... hee, hee... hardest thing is probably putting the batteries in...</P>


You press the power on button, put it near the source of the sound and sound a note. It has a simulated needle pointer that shows the note it is detecting and whether the pitch is high or low by how much.</P>


You should use a flute tone that has minimum harmonics when setting the frequency of the notes and tremolo/vibrato off.</P>