Vintage Synth Repair

You ought to get an oscilloscope..
Check z24 and z23.
If nothing changes at z24 then the logic part in front of z24 is gone.

reg Eric.


--- In vintagesynthrepair@yahoogroups.com, "Keith Niver" 
<kaniver@m...> wrote:
> Sounds like either a shorted keying diode or keying chip, whichever 
it uses.
> I don't have a print in front of me, but that's where I would look 
first if
> the key contacts are ok.
> 
> Keith Niver
> Certified MITA tech
> 
> -----Original Message-----
> From: daniel_muschinsky [mailto:daniel@s...] 
> Sent: Tuesday, July 20, 2004 4:13 PM
> To: vintagesynthrepair@yahoogroups.com
> Subject: [vintagesynthrepair] Re: arp pro soloisy, not working!!! 
playing
> the same note...
> 
> 
> 
> oh! i see...
> 
> nope. they are all good...
> 
> 
> --- In vintagesynthrepair@yahoogroups.com, "desteric" 
<desteric@y...> 
> wrote:
> > The J-wires are the keycontacts.
> > Are they all under the busbar? I mean, maybe one of them is making
> a 
> > constant contact.
> > 
> > reg,
> > Eric.
> > 
> > 
> > --- In vintagesynthrepair@yahoogroups.com, "daniel_muschinsky"
> > <daniel@s...> wrote:
> > > 
> > > what do you mean by j-wires!!?!
> > > 
> > > i checked the wires from the keycontacts to the circuitboard and
> > the
> > > flat multi colored cable with the plug (j-wires?) from the
> > > circuitboard an on... it seems OK!!
> > > 
> > > cheers! Daniel
> > > 
> > > --- In vintagesynthrepair@yahoogroups.com, "desteric"
> > <desteric@y...>
> > > wrote:
> > > > Did you check the j-wires, the connectors?
> > > > 
> > > > reg,
> > > > Eric.
> > > > 
> > > > --- In vintagesynthrepair@yahoogroups.com, "daniel_muschinsky"
> > > > <daniel@s...> wrote:
> > > > > 
> > > > > hi!
> > > > > 
> > > > > i´ve got an arp pro soloist that is not working...
> > > > > 
> > > > > no matter which key i´m playing it´s playing the same note!
> > > > > 
> > > > > is there a way to fix this!?
> > > > > 
> > > > > i couldn´t find a service or user manual on the net. has
> anyone 
> > > got
> > > > > any info!?!?
> > > > > 
> > > > > 
> > > > > cheers! Daniel
> 
> 
> 
> 
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