Vintage Synth Repair

Hey buddies,

After following the procedure for master reset proived with the E1 
Expansion Card manual (which is on my DX7), I can finally hear 
sounds, but it behaves very strangely. Most of the times when 
powering it On, sounds will play, but some notes sustain forever, 
volume changes between notes, some notes are cut after a few 
miliseconds, some do not play at all, some play well.... all 
randimally. On the other hand, I could once have it playing just 
fine ! 

What do you think could be the problem ?.....




--- In vintagesynthrepair@yahoogroups.com, "Miguel Mendoza" 
<miguel@...> wrote:
>
> Thanks François, that would be a good info.
> 
> Cheers!
> 
> Miguel.
> 
>   ----- Original Message ----- 
>   From: francois basquin 
>   To: vintagesynthrepair@yahoogroups.com 
>   Sent: Tuesday, October 31, 2006 2:06 AM
>   Subject: Re: [vintagesynthrepair] Re: DX7 plays no sound....
> 
> 
>   Miguel,
> 
>   there is a procedure to reset the entire DX (and to empty all the 
mem). I 
>   don't rember it well, but I do have it in a book and can find it 
if 
>   necessary.
> 
>   François
> 
>   >From: "Miguel Mendoza" <miguel@...>
>   >Reply-To: vintagesynthrepair@...m
>   >To: <vintagesynthrepair@yahoogroups.com>
>   >Subject: Re: [vintagesynthrepair] Re: DX7 plays no sound....
>   >Date: Mon, 30 Oct 2006 18:28:01 +0100
>   >
>   >Hi Narfman,
>   >thanks a lot for your answer and help. I needed the system 
settings because 
>   >I had an issue with the keyboard, only one octave was playing, I 
though it 
>   >might be a hidden option in the system setup. But it was due to 
a hardware 
>   >problem already solved.
>   >
>   >Thanks again for your help.
>   >
>   >Kind regards.
>   >
>   >Miguel.
>   >
>   >
>   > ----- Original Message -----
>   > From: narfman96
>   > To: vintagesynthrepair@yahoogroups.com
>   > Sent: Sunday, October 29, 2006 3:49 PM
>   > Subject: [vintagesynthrepair] Re: DX7 plays no sound....
>   >
>   >
>   > Miguel,
>   >
>   > E-mail me at Narfman96 at yahoo dot com if you want the sysex 
for
>   > the DX7II setup. I couldn't find your address as it's private.
>   > I'm not sure you wan't just any system setup because it defines
>   > evrything from the CC controller id's to the patch change 
transmit
>   > buffer. All the midi channels for each voice group (A or B)and 
the
>   > transmit channel (I use ch. 1). Local on/off and sysex on/off 
are
>   > located in the setup file too. Be careful. It may be easier to 
set
>   > your synth for the way you use it with your gear and save that 
setup.
>   > Either way if you contact me I'll send you whatever you need...
>   >
>   > Narfman (I'm in all the Yamaha DX groups also.)
>   >
>   > --- In vintagesynthrepair@yahoogroups.com, "Miguel Mendoza"
>   > <miguel@> wrote:
>   > >
>   > > Hello, I think you should also to restore the system settings 
that
>   > were in the memory like master tunning, volume and voice 
tunning.
>   > > By the way, does anybody have a system backup sysex file of 
the DX7
>   > II or can do it? Please, if you could send it to my email. I 
would be
>   > very grateful.
>   > >
>   > > Regards.
>   > >
>   > >
>   > >
>   > > ----- Original Message -----
>   > > From: gil_we
>   > > To: vintagesynthrepair@yahoogroups.com
>   > > Sent: Sunday, October 29, 2006 9:32 AM
>   > > Subject: [vintagesynthrepair] DX7 plays no sound....
>   > >
>   > >
>   > > I just got a DX7 (first version), and it plays no sound.
>   > >
>   > > I first checked the battey - and indeed it was low. I 
replaced it
>   > with
>   > > a new 3v lithium, preset banks has been reset as expexted.
>   > >
>   > > I tried playing some patches from the ROM cartridge (which 
didn't
>   > > suppose to be affected by the battery change), and programming
>   > some new
>   > > patches, but no sound it heard on neither. Anyhow, I can hear 
the
>   > hiss
>   > > coming from the amplification circuit...
>   > >
>   > > does anyone have any idea where should I look at ?
>   > > Is that a common problem on the DX7 ?
>   > >
>   > > Thanks, can't wait to make it work ;)
>   > >
>   >
>   >
>   >
>   >
> 
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