[sdiy] Boss DR110 system noise

[Metrophage]

I second what Dave said. Over the years, I have had a few DR110s
(before I learned how to fix things). My first drum machine, and still
a fave. 

I had the exact same thing happen on a DR110 I bought last year. Worked
at first, but soon after - the noise died. I made an audio cable with
just test clips for testing flaky stuff like this. Looking at
schematics, I saw where the noise was coming from. Tested there, heard
noise OK, so I knew the noise section was not broken. Next, I looked
for where the noise should have been introduced to the respective voice
subcircuits. Tested - no noise there, of course. Tracing back, between
the noise and voice sections, the noise signal was supposed to go
through an electrolytic cap... A pad had lifted, due to pressure on the
cap, holding it in place with a finger restored the noise, a little
enamel scrape and drop of solder fixed it. 

Otherwise, if the noise section has no output, look for other tall
components and bogus joints. Else, one could replace the CMOS chips, if
needed. One of the nice things about the DR110 is that they are so
simple, not much there which can go wrong.
CJ

--- Dave Magnuson <resfreq at hoohahrecords.com> wrote:
> It's quite possible that one of the VCAs for the hats, cymbal or
> snare is 
> stuck "open".    The build quality of DR-110s is rather low... I see
> cold 
> solder joints and cracked traces all the time.   So I'd look at the 
> OH/CH/CY/SN sections for a bad solder joint first.   Do you have a
> scope?
> 
> Reply off-list if you need a schematic, and I can email it to you.
> 
> Dave Magnuson
> 
> 
> ----- Original Message ----- 
> From: "Fiercefish" <fiercefish at btinternet.com>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Friday, April 29, 2005 7:52 AM
> Subject: [sdiy] Boss DR110 system noise
> 
> 
> I have a Dr-110 that was working fine up until recently, one day I
> turned it 
> on and the noise component (snare/clap) is continuosly sounding,
> other than 
> this the machine works fine, but this problem makes it unusable. What
> 
> component is it likely to be? Dodgy ribbon cable? Dead diode?
> Transistor 
> gone kaput? Has anyone else experienced this or know what the
> solution could 
> be? TIA
> 
> FF
> 
> 
>
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