X0xb0x broken suddenly no more sound at mix or headphone out

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Arnoid
 
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Joined: Thu Sep 28, 2006 3:27 am

X0xb0x broken suddenly no more sound at mix or headphone out

Post by Arnoid »

I have a working x0xb0x for a few years now but last weekend when I powered on my x0xb0x before the start of a liveset and started a sequence there was no more sound at the mix output & headphone output...
The digital section is still working I still see the sequnecer running etc

When I came home I did some further testing and when I crank up the gain to +60db or so on my analog mixer I hear a very very quiet acidline on the outputs ?

I also tested the external input abd this also doens't work anymore ?

Somebody have some tips or knows where to look I guess a broken opamp or something ?

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antto
 
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Re: X0xb0x broken suddenly no more sound at mix or headphone

Post by antto »

check with a pair of inexpensive headphones (or a scope) if you hear the synth playing at R121 (that's between the VCF and VCA)

also at the volume pot

Arnoid
 
Posts: 21
Joined: Thu Sep 28, 2006 3:27 am

Re: X0xb0x broken suddenly no more sound at mix or headphone

Post by Arnoid »

antto wrote:check with a pair of inexpensive headphones (or a scope) if you hear the synth playing at R121 (that's between the VCF and VCA)

also at the volume pot
I hear it playing @ the volume pot

Gonna check tonight if I hear it at R121 I'm not home for the moment

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antto
 
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Re: X0xb0x broken suddenly no more sound at mix or headphone

Post by antto »

if you hear it clearly at the volume pot - no need to check at R121 since that's earlier in the audio path

so, from the volume pot, there's not much stuff till the output

check if you have 6V at pin 3 on J5 (on the mainboard)
and probe at pin 1 on J5 to see if you hear the synth again (set the volume high)

Arnoid
 
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Joined: Thu Sep 28, 2006 3:27 am

Re: X0xb0x broken suddenly no more sound at mix or headphone

Post by Arnoid »

I have 1V at pin 3 of J5? And I don't hear the synth playing at pin 1

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antto
 
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Re: X0xb0x broken suddenly no more sound at mix or headphone

Post by antto »

1V?
should be 6V there

check the IO board..

Arnoid
 
Posts: 21
Joined: Thu Sep 28, 2006 3:27 am

Re: X0xb0x broken suddenly no more sound at mix or headphone

Post by Arnoid »

antto wrote:1V?
should be 6V there

check the IO board..
Ok gonna check it out tonight maybe the 78L06 is broken ?

Arnoid
 
Posts: 21
Joined: Thu Sep 28, 2006 3:27 am

Re: X0xb0x broken suddenly no more sound at mix or headphone

Post by Arnoid »

Weird my x0xb0x works again ??
2days ago I changed the old flatcabels with new ones but without succes ...

Yesteday the olyl thing I did was resoldering the 7805 voltage regulator because it was bended to much...
I did some more measurements and had 6V again at pin 3 on J5 and when tested the x0xb0x I checked the volume was normal again ???

Weird because that voltage regulator has nothing to do with the 6V at pin 3 from J5...

but the most important thing is it works again :)

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