Vintage Synth Repair

I already found it somewhere, but thanks for the thought man.

chris

paintingwithsound wrote:
> I have put the DR-55 service manual on my Downloads page at
> www.paintingwithsound.co.nz.
>
> --- In vintagesynthrepair@yahoogroups.com, freckles <freckles@...> wrote:
>   
>> Hi Scott
>>
>> thanks for your info, and sorry for the HUGE delay in getting back
>>     
> to this.
>   
>> Its not a start-button problem. regardless of what is programmed in the 
>> memory, when the cpu [tc5501] sends out the drum trigger signals, its 
>> like each trigger is doubled. its not a semi-quaver apart but maybe
>>     
> 10ms 
>   
>> or something, which makes me wonder if the sounds are restarting on the 
>> falling edge of the trigger pulse as well? but maybe its more basic
>>     
> than 
>   
>> that..
>>
>> my knowlege of electronics is very limited - i don't even understand 
>> what's happening in the clock circuit, maybe the problem is there as it 
>> connects directly to one of the cpu pins next to the trigger
>>     
> outputs.. ? 
>   
>> what would happen if C42 was faulty? What does NP 1/50 mean [next to 
>> C42]. I tried replacing the 4011UB but no change.
>>
>> Any help very much appreciated
>>
>> Thanks
>>
>> Chris
>>
>> Scott Nordlund wrote:
>>     
>>> I don't have a DR-55 but I downloaded the service manual for my own 
>>> amusement (I'm cool like that).  I would guess that the note
>>>       
> button is 
>   
>>> double-triggering, and the sequencer then correctly plays back the 
>>> wrongly-entered sequences (where you can turn the tempo down and hear 
>>> two successive steps rather than a double-triggered flam), yes?  If 
>>> I'm understanding this correctly, the rest button shouldn't 
>>> double-trigger, and you should replace C45.
>>>
>>>    
>>>       
> ------------------------------------------------------------------------
>   
>>>     To: vintagesynthrepair@yahoogroups.com
>>>     From: freckles@...
>>>     Date: Thu, 10 Apr 2008 18:10:14 +0000
>>>     Subject: [vintagesynthrepair] Boss DR-55 sounding problem
>>>
>>>     Hi just wondering if anyone has some advice/tips for me.
>>>
>>>     I have what appears to be a fully working DR-55 except the
>>>       
> drum sounds
>   
>>>     are double-triggering. most noticeable is the kick which obviously
>>>     flams, making it sound very farty.
>>>
>>>     I don't have a scope but i've recorded it to my laptop and can
>>>       
> see the
>   
>>>     double peak.
>>>
>>>     Anyone have any idea what it could be? I can mail relevant service
>>>     manual pages if that helps.
>>>
>>>     Thanks
>>>
>>>
>>>
>>>
>>>       
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