The Kawai & Teisco Analog Synths Group

What is the problem on the Akai ?

--- In kawai_sx210@yahoogroups.com, "Travis Shire" <boardjunkie@t...> 
wrote:
> Check *ALL* of the interconnects. My 240 did this when I first got 
it and
> I reseated the wires in all the IDC ribbon cables. Take the cable 
off the
> board and put it on a hard surface (not the pcb), with a small 
mallet and
> a miniature flate blade screwdriver tap the wires back into the IDC
> contacts. After doing that spray some contact cleaner into them and
> plug/unplug a couple times to clean the pins/contacts.
> 
> You have to keep in mind that the gas coming out of a dead NiCd 
battery
> is *bad* stuff and will get into everything and corrode the shit 
out of
> it. I just worked on a Poly 61 that had a bad battery in it for 
years and
> the damage was extensive. Many connectors were eaten up to the 
point of
> being not much left of the metal at all and ruined the wire from 
one end
> to the other (yes, the gas climbs up through wire inside the 
insulation).
> After repairing all the damage there was a logic problem on the cpu 
bd
> that I didn't feel like buying a service manual to find (hey, I 
paid $20
> for the thing) so its been gutted and will be a case/keyboard donor 
for a
> 6 osc. monosynth project I've had in mind for a while.
> 
> Kids.....get those damn NiCd's outta there now.
> 
> Also....if anyone's interested in some Akai AX80 parts lemme know. 
I'll
> prolly be parting one of these out soon if I can't get the switch
> matrix/display issues taken care of (no service manual available 
for this
> one).
> 
> 
> 
>   ----- Original Message -----
>   From: "Mark Daborn"
>   To: kawai_sx210@yahoogroups.com
>   Subject: Re: [kawai_sx210] Re: Can anybody please help???
>   Date: Sun, 2 Oct 2005 10:04:13 +0100
> 
> Hi, as this whole problem with my machine is due to battery 
leakage, i
> have already removed the nasty old Ni-Cadand replaced it. Ic's 7 
and 8
> have been replaced and most of the tracks  in the area hard wired. 
All
> other tracks have been tested for continuity and appear okay. The
> behaviour of the machine still suggests possibly a ground issue or a
> defective IC (or IC's!!). When played in poly mode we found there 
was a
> regular pattern to the silent notes. In poly 4 mode it was even more
> obvious. Basically 4 notes on (as we played up the keyboard) then 4 
off.
> However, cycling through the 8 voices when playing one key (that 
worked)
> showed no sign of a defective voice. We have already eliminated the
> keyboard as a source of the problem. It's looking likely that as 
it's
> getting the instructions to play a note ok, and the sound 
generation side
> of it is okay, the problem must lie somewhere in between. The plan,
> therefore, was to remove the possibility of the EPROM being 
corrupted,
> which has already had a new socket. My friend has taken the service
> manual and is going to read it cover to cover hoping for divine
> inspiration! Thanks for your help! Mark.
> 
>   ----- Original Message ----- From: gil_weTo:
>   kawai_sx210@y...: Sunday, October 02, 2005 12:10 AMSubject:
>   [kawai_sx210] Re: Can anybody please help???
>   Did you read my last response ?
> 
>   Are you rewiring the board ? did you replace all components at the
>   battery area ?
> 
>   The behavious could be due to a defected EEROM, if the battery 
hasn't
>   leaked... but as this is the situation - look at the battery 
leakage
>   as main suspect.
> 
> 
>   --- In kawai_sx210@yahoogroups.com, "Mark Daborn" 
<darkest.yugo@n...>
>   wrote:
>   > Hi,
>   >
>   > The restoration of my SX-210 continues furiously.
>   > Today my techie friend and i had the thing in bits testing and
>   probing as much as we could.
>   > We eliminated quite a few components from our investigations but
>   have reason to doubt the contents of the EPROM.
>   >
>   > Does anybody have a copy of the program or know where i might 
find
>   one? I have had a search on the net but as yet
>   > not found anything.
>   >
>   > Could someone please help? Today my SX 210 almost made a 
sensible
>   sound and it's boosted my efforts to fix it.
>   > I didn't realise how amazing the ensemble sounds!
>   >
>   > Thanks for any help you can provide,
>   > Mark
> 
> 
> 
> 
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