Old x0x never been tuned (solved)

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isak
 
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Re: Old x0x never been tuned

Post by isak »

well, i dont have oscilloscope.
is there any other way i can check?

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mmm
 
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Re: Old x0x never been tuned

Post by mmm »

isak wrote:well, i dont have oscilloscope.
is there any other way i can check?
I'm afraid not.

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isak
 
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Re: Old x0x never been tuned

Post by isak »

i got it fixed with the help of an very old friend, known as GUEST 8)
R16 150ohm replaced with 220ohm, now the midi in is working like a charm.

thanks guest.
we are missing you man.

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pulsar256
 
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Re: Old x0x never been tuned

Post by pulsar256 »

isak wrote:i got it fixed with the help of an very old friend, known as GUEST 8)
R16 150ohm replaced with 220ohm, now the midi in is working like a charm.

thanks guest.
we are missing you man.
Happy to see your x0x working now properly. I have been trying to understand that fix, but after staring at the schematics I could not make any sense of it. R16 originally calls for 100 Ohm, R15 on the other hand should actually read 220 Ohm. I take it, it was R15 and not R16?

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isak
 
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Re: Old x0x never been tuned (solved)

Post by isak »

Thanks :)

Its R16.
By the building manual its 150ohm, I've never seen its 100ohm.
Any way he told me to replace it to 220ohm.
I'll check the the old R16 and let you know the original value.

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isak
 
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Re: Old x0x never been tuned (solved)

Post by isak »

ok, ive checked the value of the old R16 and yes you are right, its 100ohm.

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pulsar256
 
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Re: Old x0x never been tuned (solved)

Post by pulsar256 »

isak wrote:ok, ive checked the value of the old R16 and yes you are right, its 100ohm.
thanks for looking it up, now i would really like to understand what was going on there. /me is puzzled.

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isak
 
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Re: Old x0x never been tuned (solved)

Post by isak »

I'll post here all the things he said in few min :)

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isak
 
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Re: Old x0x never been tuned (solved)

Post by isak »

He said to me to replace R16, and then I asked if he thinks that R16 is faulty.
this was his answer...
its not so much that its faulty, but its not well matched to ic24 and q50.  if the 220ohm doesnt work, then try 1k
So replace R16 to 220ohm did the job.
Hope it helpes you.

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