Vintage Synth Repair

hi 
there was no complete Service manual for DX7 (first edition)
on the internet.but now it is 
i just upload the complete  DX-7 first service manual in Files
hope it will help......

--- In vintagesynthrepair@...m, Kashayar Dashtdar <vdashtdar@...> wrote:
>
> Hi my friend.
> 
> Unfortunately there is no complete Service manual for DX7 (first edition)
> on the internet.
> 
> Try these :
> 
> 1- Replace all the electrolytic capacitors in the power supply board.
> 2- Send a fresh sound bank from the PC to the keyboard using a midi
> interface.
> 
> I hope it will make your dx7 work properly.
> 
> Good luck.
> Ciro
> 
> On Tue, Mar 6, 2012 at 8:49 AM, alesisfusion8hd <babouche369@...>wrote:
> 
> > **
> >
> >
> > Hi group,
> >
> > I recently bought a first generation DX7 for $ 50. Problem on startup:
> > sometimes starts up OK, sometimes keeps looping, sometimes seems OK but
> > actually frozen.
> > When it starts up OK, I found only garbage in the internal memory, but it
> > works with the cartridge. It does not memorize my settings, and main output
> > seems dead (headphone OK). I've suspected and replaced the battery cell.
> > I was able to run the self tests up to test #5 (analog inputs), but I have
> > no foot controller to complete this stage.
> > I checked the PSU and the voltage source on the main board (+2.5V, +7.5V
> > and +5AV) and everything is OK.
> > I suspect a signal is missing on the sub-CPU (6805), or a defective RAM.
> > I picked up the schematic and the service manual on Dave Benson's site,
> > but it seems to be altered after page 20. All other services manual I found
> > on the web has the same issue. Does anyone have a full copy of it?
> >
> > Thanks,
> > François
> >
> >  
> >
>