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83.131.61.14
This happens only on the cd input. The cdp is old, and when I turn it on a pop is heard also from the left speaker. Everything sounds fine...Most importantly, can I damage anything?
Thanks,
v.i.
Million miles from home.
Follow Ups:
Once again, thanx, gonna have "my repair guy" take a look at it, if this is just caps, is this a basic and inexpensive repair?v.i.
Million miles from home.
Yes, if the cap or DC servo loop situation deteriorates, you could face a blown woofer or a blown amplifier, maybe both, depending on the amount of DC that leaks and how it happens. If the DC servo loop fails suddenly, it could generate a HUGE transient on the CDPs output.I have not seen bias adjustment, like a trimpot, on a CD player. Usually the designer blocks DC with a electrolytic cap or a DC servo (an op-amp that is supposed to cancel DC on the output).
Lytics caps are known to fail frequently in today's cramped. hot electronics; do a search on motherboard caps, all kinds of horror stories.
In the past, before the personal computer, lytic caps were supposed to last ten years. Currently, probably because of legal concerns, most lytic caps are guaranteed for 2,000 hours, less than 3 years of light usage or less than 100 days if your CDP stays on during stand-by!!!If your CD player is inexpensive or old, your best bet is to replace it right away, it will cost less than having it repaired. Also newer CDPs usually (not always) sound better than stuff made a few years ago.
Good luck
Carlos
The question is whether your CD player is capacitor coupled or direct coupled.If it's capacitor coupled, the problem is exactly what others stated here, a leaky or shorted output capacitor.
If it's direct coupled, the problem is the output bias on the CD player has drifted, resulting in DC at the output. The bias has to be adjusted by a technician.
as Carlos pointed out, probably the output coupling capacitor - though it could be another component depending on the design.DC leakage has a couple negative side effects; depending on the level of leakakge it can lead your woofer voice coil to overheat earlier than otherwise expected and, it can cause linearity distortion since the woofer will see compression earlier on 1/2 of the cycle. A little leakage is probably not a concern but, we don't know how much you actually have. Its better not to have any.
Your CD is injecting DC in the volume control.
The symptoms match DC leakage.
Good luck
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