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Old 7th March 2017, 09:17 AM   #1
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Default Problem with vintage player

Hi all!

I have a very old Philips CD104, that has the following problem when connected to the amplifier: when I turn the amplifier's volume knob up or down I can see the right speaker's cone moving. This does not happen with any other player I have so it cant be amplifier related.
Apart from that, the player sounds beautifully, and I cant hear any hum or strange noise.
Any ideas what can it be and what can be done?
And can I use it like this until I get it repaired? I mean is there any danger for the amplifier or speaker?
I really love this player's sound and would hate to part with it.
Thank you very much! Any advice would be much appreciated.

Last edited by Juien; 7th March 2017 at 09:25 AM.
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Old 7th March 2017, 09:46 AM   #2
poynton is offline poynton  United Kingdom
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Change over the audio leads from the cd player.

Does it still happen with the same speaker or has the effect also changed sides?

If the effect changes sides then you have a problem with the cd player - probably a small amount of DC voltage on the channel.

If it does not change sides then the fault is in the amplifier.


Andy
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Old 7th March 2017, 09:50 AM   #3
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Thank you for answering!
I will try to do that once I get home from work.
Anyway, if it proves that the effect changes sides and there is that amount of dc voltage - is there any danger? And what can be done?
Thank you again!
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Old 7th March 2017, 02:52 PM   #4
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So, I swaped the audio leads and the effect went to the left speaker, it's definitely the player
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Old 7th March 2017, 06:01 PM   #5
poynton is offline poynton  United Kingdom
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Do you have a test meter ?

If you do, then measure across the output of the affected channel and see what the voltage is. It should be zero but may be a few millivolts.


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Old 7th March 2017, 06:03 PM   #6
Mooly is offline Mooly  United Kingdom
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Before you do anything I would try and measure any DC offset coming from the players output sockets. There should be zero volts.

I haven't got the manual in front of me but this just might be something fairly simple as I think the player will have an AC coupled output which means that should always be no DC voltage at the output.

Didn't these players suffer from 'griplet' issues, called rivets or bushes here:

~ Classic CD Player Modification & Modernisation ~
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Old 7th March 2017, 06:48 PM   #7
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Unfortunately, I dont have a test meter.
Searching on similar issues on the internet, I also found out that it may be a dc offset and a dead output coupling capacitor?
Can it be fixed or is this player dead?
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Old 7th March 2017, 06:56 PM   #8
Mooly is offline Mooly  United Kingdom
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Yes, it should be fixable assuming that its a 'normal' fault, and that it is not caused by something like spillage or the unit having an unknown history such as having been bought second-hand.

Without basic test equipment it all becomes guesswork. You have to be able to measure.
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Old 8th March 2017, 10:56 AM   #9
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I will get a guy to do some measurements.
Anyway, the more I read about it the more I am convinced that this is related to the output coupling caps. How do I know which are those?
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Old 8th March 2017, 11:32 AM   #10
Mooly is offline Mooly  United Kingdom
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You look at the service manual, thats how

https://www.hifiengine.com/manual_li...ps/cd104.shtml
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