[sdiy] Repair help Waldorf Chord Gekko

[Ullrich Peter]

Hi!

This is normal for MIDI powered devices as they need the power from MIDI Input.
And it doesn't matter as the Gekko doesn't bring another ground level as it has no 
Additional ground connection that could lead to problems...

Ciao
Peter

-----Original Message-----
From: MTG [mailto:grant at musictechnologiesgroup.com] 
Sent: Friday, April 22, 2011 3:14 PM
To: Ullrich Peter
Cc: Synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Repair help Waldorf Chord Gekko

Curious that they seem to neglect the MIDI spec current loop somehow...

GB
www.musictechnologiesgroup.com


----- Original Message ----- 
From: "Ullrich Peter" <Peter.Ullrich at kapsch.net>
To: "Tom Wiltshire" <tom at electricdruid.net>; "Sam Ecoff" 
<sam at synthasonic.com>
Cc: "sdiy DIY" <synth-diy at dropmix.xs4all.nl>
Sent: Friday, April 22, 2011 2:20 AM
Subject: Re: [sdiy] Repair help Waldorf Chord Gekko


> You can see pictures of the old Gekko Hardware here:
> http://pics.studiorepair.de/Waldorf/Gecko/slides/Waldorf_Gecko_PCB.html
>
> At least the Gekko Chord and Arpeggio used this hardware.
> Maybe also the Gekko Trigger...
>
> Ciao
> Peter
>
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl 
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Ullrich Peter
> Sent: Thursday, April 21, 2011 10:27 PM
> To: Tom Wiltshire; Sam Ecoff
> Cc: sdiy DIY
> Subject: Re: [sdiy] Repair help Waldorf Chord Gekko
>
> Hi!
>
> Interesting that the newer Gekkos use PIC processors as the old Gekko 
> Chord used a 8031 microcontroller and an external eprom...
>
> Ciao
> Peter
> ________________________________________
> Von: synth-diy-bounces at dropmix.xs4all.nl 
> [synth-diy-bounces at dropmix.xs4all.nl] im Auftrag von Tom Wiltshire 
> [tom at electricdruid.net]
> Gesendet: Donnerstag, 21. April 2011 19:44
> An: Sam Ecoff
> Cc: sdiy DIY
> Betreff: Re: [sdiy] Repair help Waldorf Chord Gekko
>
> It was my understanding that the 16C parts are one-time programmable, so 
> if the chip is scrambled, it might stay scrambled. That said, you could 
> probably replace it with a 16F part. On the page on Microchip's website, 
> they suggest the PIC16F723A, but I haven't checked whether it'd be 
> pin-for-pin compatible or if it just has the same features.
>
> http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en010145
>
>
> HTH,
> Tom
>
> On 21 Apr 2011, at 18:00, Sam Ecoff wrote:
>
>> Discovered today that my beloved Waldorf Chord Gekko is hosed. (It's a 
>> MIDI widget that basically adds chord memory function to any MIDI 
>> keyboard see here: 
>> http://matrixsynth.blogspot.com/2008/01/waldorf-gekko-midi-chord-memorizer.html ) 
>> I think that the PIC in it got screwed up somehow. It's a 16LC63A. I 
>> don't suppose anybody on the list can point me to someplace that might 
>> have code for this bugger?
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