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Hi all,

Been a while since I posted here, but I could really use some help, as I have only recently had the time to get back into music, and seem to be plaqued by all sorts of problems the most pressing being this one.

My Yamaha 03D is the heart of my install, as the ADAT in/out is connected straight to my Pulsar card.

Of late I have noticed that occasionally I get extreme continuous noises on the input stage, at first it just started out as occasionaly blips. So at first I assumed it was a digital clocking problem.

Today I got round the back of my equipment and pulled out all the inputs/outputs into/out of the mixer, and the noise was still showing on the input faders on numerous channels?

Anyone else had the same problem?

<font size=-1>[ This Message was edited by: remixme on 2005-11-18 04:53 ]</font>

is the noise distributed randomly over channels or is there a pattern (like only even channels, first or second half etc) ?

if it's random - are there any changes in WLAN or wireless phone setups around it's location ?

in case there's a pattern the buffering caps of the powerlines are often suspect to failure.
I'd only suggest further action if the unit is out of warranty.
Do you have a multimeter available and some experience how to handle it ?

cheers, Tom
ps: if you remember, that toy guitar is still alive and I even developed some playing technique for that that thingy...

Hey Tom,

Good to hear from you again mate, I had a feeling it would be you who would come to my rescue.

The problem is kind of intermittant, so it's hard to tell if it's patterned, but when it does appear, it stays on those particular channels to the point where I can mute them.

It could be a powercap problem, as all my equipment get's switched off at once, I have one of those "OneClick" extenstion boards which turns all of my equipment on when I turn on my computer.

I figured it could be something like that as I have already had to replace the protection relay on my albeit aging Samson Servo 170.

As for multimeter and experience with it, I certainly do, in fact most of my gear gets serviced by me. I would have had the thing open already, but I wanted to have some idea of what I was looking for before taking the thing to bits, and yep its way out of warranty!

Thank's in advance,

Si

with a very good multimeter you could measure the caps directly, but with the humble $20 helpers it's not that simple.

The multichannel structure helps a lot, tho.
Mark the channels that work and compare the respective parts with those of the 'problem' channels. There has to be a difference somewhere.

I usually measure 'resistance' across the cap, which is nonsense, but produces a side effect, the cap get slowly loaded and the value on the multimeter display changes.
The proper range is trial and error, but eventually the measure will approach a certain value in a certain time (say 15 seconds).

The suspective caps will just 'behave non-standard', either a significant difference in value (and) or time - it's no scientific approach at all, but it mostly works

if caps are 'broken' it may be difficult to get replacement parts in case they are the same type as those used on motherboards (for example).
The latter are industrial supplies and generally not available in electronic shops.

I'd suspect the ones buffering input converters and op-amps in the first place

good luck, Tom

Try The Pulsar's setting as Slave Clock (ADAT). You will need to turn on the Yamaha at all time when your PC is on.

Hope this helps,
LongStudio