Yahoo Groups archive

Vintage Synth Repair

Index last updated: 2026-04-28 23:41 UTC

Thread

Roland TR707

Roland TR707

2013-04-12 by Nick Bell

Hi,

I'm working on a 707 with no midi out. I suspect Q6 which is a 603 58F - does any one know a suitable replacement & where I might source one? Could be either said transistor or IC3 which is a HD14584BP hex schmitt trigger - again, anyone know of suitable replacement? .. or perhaps the cpu is failing somehow but I doubt it. I can't scope any of it as I cant afford one yet, so my limited skills have narrowed it down to these components.

Thanks for your help

Re: Roland TR707

2013-04-12 by alesisfusion8hd

Hi Nick,

hard to nail the cause without a good tool. Maybe you should consider building a cheap logic probe: http://www.swansontec.com/sprobe.html
Will certainly be helpfull.

Francois

--- In vintagesynthrepair@yahoogroups.com, Nick Bell <mckenzie126@...> wrote:
Show quoted textHide quoted text
>
> Hi,
> 
> I'm working on a 707 with no midi out. I suspect Q6 which is a 603 58F - does any one know a suitable replacement & where I might source one? Could be either said transistor or IC3 which is a HD14584BP hex  schmitt trigger - again, anyone know of suitable replacement? .. or perhaps the cpu is failing somehow but I doubt it. I can't scope any of it as I cant afford one yet, so my limited skills have narrowed it down to these components.
> 
> 
> Thanks for your help
>

Re: [vintagesynthrepair] Roland TR707

2013-04-12 by Paulo Palmieri

Hi Nick,
I already replaced the 603 transistor in a Juno 106 and i used 2SC1815 as a replacement according the Juno 106 service notes. It works perfectly. And if you need a PNP, the 2SA1015 is ok.
The 2SC1815 is easily found in many stores.
Hope this helps a bit...
Regards,
Paulo Palmieri
Show quoted textHide quoted text
----- Original Message -----
From: Nick Bell
Sent: Friday, April 12, 2013 2:14 PM
Subject: [vintagesynthrepair] Roland TR707

Hi,

I'm working on a 707 with no midi out. I suspect Q6 which is a 603 58F - does any one know a suitable replacement & where I might source one? Could be either said transistor or IC3 which is a HD14584BP hex schmitt trigger - again, anyone know of suitable replacement? .. or perhaps the cpu is failing somehow but I doubt it. I can't scope any of it as I cant afford one yet, so my limited skills have narrowed it down to these components.

Thanks for your help

Re: [vintagesynthrepair] Re: Roland TR707

2013-04-14 by Nick Bell

Thanks Francois, will def build one of them. 




________________________________
 From: alesisfusion8hd <babouche369@...>
To: vintagesynthrepair@yahoogroups.com 
Sent: Friday, 12 April 2013, 22:46
Subject: [vintagesynthrepair] Re: Roland TR707
 


  
Hi Nick,

hard to nail the cause without a good tool. Maybe you should consider building a cheap logic probe: http://www.swansontec.com/sprobe.html
Will certainly be helpfull.

Francois

--- In vintagesynthrepair@yahoogroups.com, Nick Bell <mckenzie126@...> wrote:
Show quoted textHide quoted text
>
> Hi,
> 
> I'm working on a 707 with no midi out. I suspect Q6 which is a 603 58F - does any one know a suitable replacement & where I might source one? Could be either said transistor or IC3 which is a HD14584BP hex  schmitt trigger - again, anyone know of suitable replacement? .. or perhaps the cpu is failing somehow but I doubt it. I can't scope any of it as I cant afford one yet, so my limited skills have narrowed it down to these components.
> 
> 
> Thanks for your help
>

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.