Does anyone know what components I would be looking at replacing on a CD player with a ridiculously loud output level? its so loud, its distorted, and it can be heard playing on a system when the volume is at zero. As it warms up, the level drops to normal. All electrolytics have been replaced, so its not those.
Firstly, you'd be looking for a make, model number.
Because no one can be of any help, or even speculate, on something unknown.
All we know is..... "it's a CD player" of some sort.
Asides from that, what reason were the capacitors replaced for?
Hopefully, it wasn't some unprofessional online hype about "bad caps".
Because no one can be of any help, or even speculate, on something unknown.
All we know is..... "it's a CD player" of some sort.
Asides from that, what reason were the capacitors replaced for?
Hopefully, it wasn't some unprofessional online hype about "bad caps".
I figured the make/model doesn't matter. A CD player circuit is a CD player circuit, surely would be the same issue regardless. But, if it matters, its a B&O CDX. Caps were replaced because they are over 30 years old, has nothing to do with my question.
No.
It does matter, and not all CD machines are "the same", and use the same design.
Trust me, I've been an audio/video service tech for decades.
As for the cap replacement, it should have only been done if something was obviously malfunctioning, and done under strict understanding of static sensitive devices that are used in these machines.
It does matter, and not all CD machines are "the same", and use the same design.
Trust me, I've been an audio/video service tech for decades.
As for the cap replacement, it should have only been done if something was obviously malfunctioning, and done under strict understanding of static sensitive devices that are used in these machines.
It's hard to answer that question without knowing the cause. Does it have it's own DAC or do you use an external DAC?
Have you tried with another DAC or preamp or whatever you use, could it be that THAT has too much gain?
Have you tried to burn a 1kHz disc and measuring what comes out?
Jan
Have you tried with another DAC or preamp or whatever you use, could it be that THAT has too much gain?
Have you tried to burn a 1kHz disc and measuring what comes out?
Jan
Again, you have to give more details. wiseoldtech was right, from the little you have told us, it sounds like the cap replacement caused the problem. Hmmm, what changes as the device warms up....could it be the caps fully charging 😀
you need a circuit diagram so you can scope it through and check voltages.
anything else is speculation.
anything else is speculation.
The B&O CDX is an early Philips based player and so has a 2v output.
What input are you plugging it into on your amplifier?
Andy
What input are you plugging it into on your amplifier?
Andy
This sounds a very very strange issue for a stand alone CD player...
You must do one basic test before anything else and that is to either confirm that the issue still occurs when used with a different amplifier or you must measure the output using a scope and see if the level is to high and distorted and then comes down over time or not.
I've never known a basic CD player to have an output that varies over time.
You must do one basic test before anything else and that is to either confirm that the issue still occurs when used with a different amplifier or you must measure the output using a scope and see if the level is to high and distorted and then comes down over time or not.
I've never known a basic CD player to have an output that varies over time.
wiseoldtech was not right, and his "know it all" attitude and information was poor at best. Yeah, lets wait for a catastrophic failure before replacing caps, because that makes sense! Not only did he not have a clue/didn't even answer the question, but many high end manufacturers recommend replacing caps every 13- 15 (AS REGULAR MAINTENANCE) years in their kit for a reason, I am sure wiseoldtech is going to call this snake oil nonsense. I won't waste my time with people like him.
I said it's not the caps, because I know it is not the caps, as the issue was present BEFORE the caps were replaced.
You are actually the second person to tell me that 2 resistors are the cause! So I will be looking into this in more detail. Thanks.
It most certainly is an odd one, I haven't seen before either. I have tried it on different system with same results. I will add, one of those systems was damaged by running this CDX through it. I am guessing the high output did some damage somewhere in the amp .. luckily I use old kit for testing things.
It could be the cd player, however 2mv output might not match your amplifier. Could you tell us which amp you are using and if it has a cd input? If you are using an old amp with aux input you might need to weaken the output or change the input of your amp. (Had a similar issue with Quad 33 amp). You can buy plugs like Rothwell or change the resistors yourself.
Also, no offense intended, have you replaced all the caps with the same value and the right way in?
Yep, no offence taken, it is an easy mistake to make. As previously mentioned, this issue was present before the caps were replaced, and yep, they are all in correctly and with the correct values as per the schematic.
Time to get hold of a schematic, a test disc with some pure tones, your test gear and probe about looking for levels at different points to locate the problem.