Vintage Synth Repair

Well, looking closely at the circuit I found some corroded traces...
I guess there is a great chance that this is the cause of the 
problem - will retrace and check again. I always thought this can 
only happen on a NiCD battery based synths...


--- In vintagesynthrepair@yahoogroups.com, "gil_we" <gil_we@...> 
wrote:
>
> It would be so great if you could send it... Lemme know :)
> 
> 
> 
> --- In vintagesynthrepair@yahoogroups.com, "jim" <leman@> wrote:
> >
> > Hi Miguel 
> > 
> > Many years ago, I had a DX7 and put an expansion card to get 4
> > internal banks. 
> > to install the card, I'd to remove the genuine IC ROM from the DX.
> > I sold the keyboard but I think I still have these genuine ROMs.
> > If you need them, tell me, I'll look for them. Just be patient and
> > make a pray to help me to find them easily !
> > 
> > jim
> > 
> > --- In vintagesynthrepair@yahoogroups.com, grantbt@ wrote:
> > >
> > > I don't think those ROMs would be that hard to come by...
> > > 
> > > GB
> > > 
> > > 
> > > -----Original Message-----
> > > >From: gil_we <gil_we@>
> > > >Sent: Oct 31, 2006 12:26 PM
> > > >To: vintagesynthrepair@yahoogroups.com
> > > >Subject: [vintagesynthrepair] Re: DX7 plays no sound....
> > > >
> > > >No I don;t think so. You need the two original ROMS that have 
> been 
> > > >removed once installing it. Sounds like bad contacts 
somewhere. 
> I'll 
> > > >check it out.
> > > >
> > > >
> > > >
> > > >--- In vintagesynthrepair@yahoogroups.com, "GB" <grantbt@> 
wrote:
> > > >>
> > > >> Remove the E! ?
> > > >> 
> > > >> GB
> > > >> 
> > > >> ----- Original Message ----- 
> > > >> From: "gil_we" <gil_we@>
> > > >> To: <vintagesynthrepair@yahoogroups.com>
> > > >> Sent: Tuesday, October 31, 2006 3:48 AM
> > > >> Subject: [vintagesynthrepair] Re: DX7 plays no sound....
> > > >> 
> > > >> 
> > > >> 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@...m, "Miguel Mendoza"
> > > >> <miguel@> wrote:
> > > >> >
> > > >> > Thanks Fran�ois, 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.
> > > >> >
> > > >> >   Fran�ois
> > > >> >
> > > >> >   >From: "Miguel Mendoza" <miguel@>
> > > >> >   >Reply-To: vintagesynthrepair@yahoogroups.com
> > > >> >   >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@...m, "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 ;)
> > > >> >   > >
> > > >> >   >
> > > >> >   >
> > > >> >   >
> > > >> >   >
> > > >> >
> > > >> >   
__________________________________________________________
> > > >> >   Voyez vos amis en faisant un appel vid�o dans Windows 
> Live
> > > >> Messenger
> > > >> >   http://imagine-msn.com/messenger/launch80/default.aspx?
> > > >locale=fr-
> > > >> ca
> > > >> >
> > > >> 
> > > >> 
> > > >> 
> > > >> 
> > > >> 
> > > >> 
> > > >> Yahoo! Groups Links
> > > >>
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > 
> > > >Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > >
> >
>