Kenwood UD90 crakle & pop! - diyAudio
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Old 27th October 2012, 08:06 PM   #1
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Default Kenwood UD90 crakle & pop!

Good grief... just dug out the receipt - bought in 1992 - I had no idea it was that old. £900 with Yamaha centre speaker in it's day though

My problem is this - by about half way through watching a DVD the sound starts to pick up some kind of interference(?) and starts to make a sort of electrical pop/crackle which makes it unusable and I have to switch it off and just watch through the Pioneer TV.

Anything I can check or is it time for a new system?

Thanks in advance

Stewart
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Old 28th October 2012, 07:37 PM   #2
Mooly is offline Mooly  United Kingdom
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Is the problem on one or all channels ? Does it do this fault if just playing a CD or listening to another source ?

I would guess (and it is purely a guess) that this unit uses some form of "monolithic" or "hybrid" output IC rather than discrete circuitry. Typical problem areas could be something as simple as a poor soldered joint, relay contacts if it uses any and a faulty output IC.

You need to pin it down a lot more with tests first
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Old 28th October 2012, 08:26 PM   #3
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Many thanks for that logical thought - I mainly use it for films these days. CD's seem to be a thing of the past for me - mostly I-tunes on the Computer now.
I've set it up to play from the Sky box and leave it on to see what happens.
I'll report back...
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Old 28th October 2012, 10:16 PM   #4
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Interesting test... Sky for 2 hours, trouble free

Quote:
this unit uses some form of "monolithic" or "hybrid" output IC rather than discrete circuitry
I have no idea what that actually means

Is it a reference to the unit putting out Dolby Pro Logic when I'm watching a DVD rather than just normal when watching Sky or am I way off

Maybe I should check out all my connections first?
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Old 29th October 2012, 07:04 AM   #5
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Cracked solder points.

Gajanan Phadte
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Old 29th October 2012, 08:36 AM   #6
Mooly is offline Mooly  United Kingdom
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A monolithic or hybrid output stage is one using something like an LM3886 or and STK4141 type component. Do an internet search for those two as examples Up to now though and it sounds like the problem is elsewhere.

So it played OK...

That seems to point the finger at the DVD source and some problem with its output. Again you need to narrow things down. Does the Sky audio feed come into the Kenwood via the same inputs or not. If not then can you swap them around and retest.

Without seeing how its all connected its hard to say. This is why you have to pin it down. How about leaving the DVD playing until you know it would be showing a fault and only then turning the Kenwood on. If the DVD is the problem it would sound distorted immediately. If it was some problem with the Kenwood it would still take that hour or more for a problem to show.
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Old 29th October 2012, 08:54 PM   #7
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Thanks again Mooly for both time and ideas. What's simple to you experts, us newbies don't think of
I've swapped cables, removed a couple I don't need any more (like the old coaxial arial - on Sky Digital so don't use it) and just watched a DVD - perfect!

Fingers crossed, I might be back
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Old 30th October 2012, 08:31 AM   #8
Mooly is offline Mooly  United Kingdom
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Thanks for the update... lets hope its OK
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