ONKYO TECHNICS CD players repair help... - diyAudio
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Old 12th September 2010, 08:44 AM   #1
liquias is offline liquias  Israel
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Default ONKYO TECHNICS CD players repair help...

Hi,
I got from a friend two old CD players with similar symptoms:

1) Both players were supposed to get 110Vac and got 220Vac supply.
2) Both players blew their primary winding in the transformer. (naturally).
3) Both player have no fuse, not even inside the transformers. (What? What is this, Who make a machine with no fuse ?).

I'm quite at a loss here, I have no idea how to determine the secondary voltages needed out of these transformers.

CD players are :
1) ONKYO DX-2700
2) TECHNICS SL-PD627 (5 CD carousel).


My questions are :
1) Does anyone know what secondary voltages, and volt-ampere rating any of these ex-traffos used to be ?
2) Are these CD players worth the effort of salvaging ?

thanks ,
Liquias.
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Old 12th September 2010, 12:10 PM   #2
Mooly is offline Mooly  United Kingdom
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They will probably have a non replaceable thermal fuse fitted in the windings. Does the primary read open circuit ?
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Old 12th September 2010, 03:52 PM   #3
liquias is offline liquias  Israel
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Oh, believe me, they don't.
One of them is welded tight, and the two of then are toast.
primary gone (open circuit) - very very black primary winding with many open ends, no fuse inside the winding - I checked...
Secondary looks fine.
But thanks anyway.

Both of them are multi voltage output transformers.
I guess I could fit a transformer into those machines, if I knew the voltages. I can tell by the caps and regulators the general ball park, but i'm hoping for some more accurate help.
Any idea is also very appreciated...
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Old 12th September 2010, 06:37 PM   #4
Mooly is offline Mooly  United Kingdom
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If the thing has sat powered up on the wrong voltage there may be other damage, as all the secondaries will have been very high... which you won't know untill you power it all up.

Impossible to say without looking in great detail how it's all connected. There may be windings for the display etc as well as analogue and digital stages. You can work back from anything with a reg, just select an AC voltage that allows enough headroom for the regs to work after rectification/smoothing. Currents harder to guess, depends what feeds what.

Do the original trannies smell burnt ? Strange there is no fuse... it wouldn't pass safety tests without.
Post a picture maybe (a clear one) showing the pins on the transformers and the internal mains side of things on the players... I'm just puzzled.
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Old 12th September 2010, 08:53 PM   #5
liquias is offline liquias  Israel
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Quote:
Originally Posted by Mooly View Post
If the thing has sat powered up on the wrong voltage there may be other damage, as all the secondaries will have been very high... which you won't know untill you power it all up.
Of course, electronics might just as well be fried. It looks OK but I have to admit that I haven't even started to check it.


Quote:
Originally Posted by Mooly View Post
Impossible to say without looking in great detail how it's all connected. There may be windings for the display etc as well as analogue and digital stages. You can work back from anything with a reg, just select an AC voltage that allows enough headroom for the regs to work after rectification/smoothing. Currents harder to guess, depends what feeds what.
That's my main loss. I am hoping for either someone who knows these players, or someone with a service manual...


Quote:
Originally Posted by Mooly View Post
Do the original trannies smell burnt ? Strange there is no fuse... it wouldn't pass safety tests without.
Post a picture maybe (a clear one) showing the pins on the transformers and the internal mains side of things on the players... I'm just puzzled.
Oh yes, the traffos smell burnt. I don't understand how two different and separate devices had no fuse.
Pictures to come, hopefully tomorrow.

I'm still not sure it's worth the effort, the onkyo is a VERY old CD player I'm not even sure I could get the laser pickup should I ever needed a spare, though It's supposed to be a good one, and I'm not very fond of 5 CD carousels (Technics).

What do you think ?
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Old 13th September 2010, 06:58 AM   #6
Mooly is offline Mooly  United Kingdom
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What do I think ? It's probably not worth the hassle.
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Old 15th September 2010, 10:50 AM   #7
liquias is offline liquias  Israel
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Sorry for the late replay...
I believe I'll be quoting Anatech's wife saying :
"Just because you can, doesn't mean you should".

Throw in YOUR time and effort.

I think I might be able to give these two a rest. (they're no Sherwood...)
I think I might ask around for people with service manual (the easy way...) but other than that CD players might be considered 'for spare parts'...

Pictures are out of the question, (unless for some reason you want to see the insides of these players).

Again, (as always),
THANK YOU !
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Old 15th September 2010, 12:35 PM   #8
Mooly is offline Mooly  United Kingdom
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Your welcome...
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