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Sony CDP790 and KSS240 Restoration Project
Sony CDP790 and KSS240 Restoration Project
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Old 1st November 2020, 07:14 AM   #211
Mooly is offline Mooly  United Kingdom
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Sony CDP790 and KSS240 Restoration Project
Could be a bargain for $10, particularly if it has a good RAFOC (laser assembly) and the CDP997 from what I can see does look very similar to the Sony in this thread...

Enjoy
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Old 27th November 2020, 12:20 PM   #212
maouna is offline maouna  Greece
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Can those cheap chinese oscilloscopes be used to show the eye pattern of a cdplayer and to calibrate it succesfully?

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Old 27th November 2020, 02:31 PM   #213
Mooly is offline Mooly  United Kingdom
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No idea tbh as I've never used one. The bandwidth is more than adequate but how a complex eye pattern would look I wouldn't like to say.

I imagine you would see some sampling artefacts and so it would look less clean than viewing on an analogue scope, but that it should be representative in amplitude given the bandwidth.
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Old 27th November 2020, 04:19 PM   #214
maouna is offline maouna  Greece
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i was thinking of buying one of these but i cant find a video anywhere showing the eye pattern on such cheap oscilloscopes.I dont know whether they have this chop/alternative mode or not.
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Old 27th November 2020, 04:58 PM   #215
thimios is offline thimios  Greece
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Sony CDP790 and KSS240 Restoration Project
Quote:
Originally Posted by tiefbassuebertr View Post
Same thing, in second catalog is 10 pieces.
Good quality, i'm afraid not.
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Old 27th November 2020, 05:30 PM   #216
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by maouna View Post
i was thinking of buying one of these but i cant find a video anywhere showing the eye pattern on such cheap oscilloscopes.I dont know whether they have this chop/alternative mode or not.
Chop and Alternate is used when using a scope in dual trace mode. Viewing the eye pattern is done with a single trace so those don't really figure into things.
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Old 27th November 2020, 06:47 PM   #217
maouna is offline maouna  Greece
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Quote:
Chop and Alternate is used when using a scope in dual trace mode. Viewing the eye pattern is done with a single trace so those don't really figure into things.
Looking at this service manual says to set input mode to alternate or chopper thats why i am asking.Havent done such a measurement before and i am a bit confused.
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Old 27th November 2020, 07:36 PM   #218
Mooly is offline Mooly  United Kingdom
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Well you would normally turn the second channel on the scope off (so it behaves as a single beam) and then the Chop/Alt don't apply. The eye pattern is a single measurement that can be done on a single beam scope.

------------------------------------

The difference if you have both traces running is that Alternate traces out first channel 1 and then channel 2 and so on. Chop displays both together with the traces literally 'chopped' as they scan left to right.

It makes a difference at really low sweep speeds where you want to see both traces together and not have one trace disappear while the other traces out.

Found this:
#31: Analog oscilloscope ALT, CHOP, ADD, INVERT vertical controls - YouTube

That's all it does
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Old 9th December 2020, 06:54 PM   #219
maouna is offline maouna  Greece
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Today i received the kss240a i ordered 1 month ago for my denon-dcd625.The original kss240a loooks like the one below on the left but what i received had a 10pin ic instead of a 24pin and another extra ic that the original doesnt have.( picture on the right).When i bought it from the seller ,the photo corresponding to the item was that of the one with 24pins and so i decided to buy it but i received one with 10pin ic.
Is this of inferior quality?
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Old 9th December 2020, 07:49 PM   #220
Mooly is offline Mooly  United Kingdom
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As far as I know none of the replacements are genuine Sony parts and haven't been for nearly 20 years now.

All you can do is fit it and see how it performs. Its a totally different design electrically but as long as it works to the original spec then it should be OK.

Another difference you will notice is that original parts have the sintered phosphor bronze bearing shells whereas the replacements use moulded plastic.
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