Would appreciate comments or help with a high pitch whining noise coming from the power supply board of a CD/SACD player.
Recently picked up a 999ES player to hack up and do some mods many have done throug the years.
The player seems to operate fine, however the other night, I detected a high pitch whining noise coming from inside the player when the drawer was open.
So I took the top cover off and found this noise is coming from the power supply board.
The noise gets louder when the player is in operation, and when loading/unloading discs, and during the initial disc read.
My questions are:
Is this noise associated with the switching power supply design of this player; or could there be something wrong this unit.
Are there relatively easy solutions to fixing this issue that a parts swapping modder like myself could handle.
Or is this something that should not be too much of a concern, as it does not affect the performance of the player.
I have read threads of others designing an entire new power supply circuit, but that is not something I can handle...
One other thing, I can't detect this noise from my Music Hall CDP when the drawer is open.
So is this a design flaw with the Sony players.
Cheers all.
Recently picked up a 999ES player to hack up and do some mods many have done throug the years.
The player seems to operate fine, however the other night, I detected a high pitch whining noise coming from inside the player when the drawer was open.
So I took the top cover off and found this noise is coming from the power supply board.
The noise gets louder when the player is in operation, and when loading/unloading discs, and during the initial disc read.
My questions are:
Is this noise associated with the switching power supply design of this player; or could there be something wrong this unit.
Are there relatively easy solutions to fixing this issue that a parts swapping modder like myself could handle.
Or is this something that should not be too much of a concern, as it does not affect the performance of the player.
I have read threads of others designing an entire new power supply circuit, but that is not something I can handle...
One other thing, I can't detect this noise from my Music Hall CDP when the drawer is open.
So is this a design flaw with the Sony players.
Cheers all.
Noisy SMPSU's used to be a real problem in the TV trade. It's a case of how noisy is it, and is it actually faulty ( probably not ). The no1 problem with these type of PSU's ( in general ) is dried out caps, and that CAN make the thing noisy. You may never cure it though, I've taken transformers and coils out and hot soaked them in varnish, and even that doesn't always work, it's down to the nature of the irregular HF chopper frequency, there's just so much magnetic energy within the coils that they sing. The noise changes with function as the drive waveform changes to compensate for differing power demands from the player.
That player's power supply should not be whining unless there are electrolytic capacitors going bad in it. Usually, these will be Rubycon, which have the highest failure rate in such things, and I would strongly recommend replacing all the caps in the SMPS with Nichicon or Nippon ChemiCon.
Appreciate the replies and advice.
Will start with replacing all the electrolytic caps on the PS board and go from there.
Cheers
Will start with replacing all the electrolytic caps on the PS board and go from there.
Cheers
Other than what Mooly and stephensank suggested, I changed all the electrolytic caps except the largest one which is a 270uf 250v nichicon; did not have this value and need to find a source for a replacement.
All the others were replaced with nichicon golds, BG Standards, and BGNX's.
I did a double check of the PS board this evening and pinned down the whining to be coming from or near one of the power transformers .
The noise does change in pitch and level when a disc is in play mode; it also gets much quieter when the player is in standby mode.
I stuck a tube damper around the transformer which cut the whining down by about 50%.
Would changing the 1N4005 diodes to Fairchild Stealths help to lower the ringing.
All the others were replaced with nichicon golds, BG Standards, and BGNX's.
I did a double check of the PS board this evening and pinned down the whining to be coming from or near one of the power transformers .
The noise does change in pitch and level when a disc is in play mode; it also gets much quieter when the player is in standby mode.
I stuck a tube damper around the transformer which cut the whining down by about 50%.
Would changing the 1N4005 diodes to Fairchild Stealths help to lower the ringing.
Changing 4005's almost certainly not and without actually hearing it for real it's impossible to say whether it's faulty or not. Have others complained of this same problem ?
Is it annoying if you are 4 or 5 feet away from it. Sony have a data base of faults etc but you would need someone with an active account to access it, or contact Sony technical, but again you need to be an account holder. The 270mfd wil be the main reservoir cap, and these "can" fail ( again generally on various stuff ). To test it's not critical, a 150, 220 or 330mfd will be fine to tag in.
Is it annoying if you are 4 or 5 feet away from it. Sony have a data base of faults etc but you would need someone with an active account to access it, or contact Sony technical, but again you need to be an account holder. The 270mfd wil be the main reservoir cap, and these "can" fail ( again generally on various stuff ). To test it's not critical, a 150, 220 or 330mfd will be fine to tag in.
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