ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hi Guys,So after a couple of months of not using the CD50, which was working fine last time, it's decided to chuck a hissy fit.The CD player seems to play fine, loads the disk, plays the disk, changes track. All of that is working, there is just no output from the RCA outputs.I have replaced the capacitor for the muting circuit, which was blown, but to no avail. System still has no output.I've noticed that if I plug the RCA cables into the CD player while the amp (non B&O) is on, there is no "crack" through the speakers, making me think there is an open circuit somewhere. I don't know if this is a correct diagnosis or not...The cable works with other systems so I know that's not the problem.
I don't have a din to RCA cable to test the other output.
If anyone has any ideas on what could be the problem that would be great. I'm thinking there may have been a chain reaction from the muting capacitor blowing out.Cheers,Luke
Which is the "muting capacitor" you refer to,and how has it "blown out"just out of interest?
The muting circuit in these rather nice,but somewhat overdesigned machines,is quite complex.
Apart from muting duties during normal play,in case something corrupts the signal,the circuit also mutes after a power outage,when power is restored,but should then "disconnect" after a short period.
Does the sound appear if you leave the machine for a while playing?
Nick
Not sure if this is the cap the OP has replaced, but C354 (470uF) is the usual culprit.Normally, the symptoms are no sound at first, then - if you let the deck play - slowly (and distorted) sound coming up creeping,then -if you wait long enough - sound clears up and it plays on fine for the rst of the session. Next day it's all over again.But if the deck stood unused for a long time, the cap may have died completely, causing constant muting.
Martin
Managed to get it workingC354 was the initial cap I replaced, bottom bulged out so I was able to find it and replace quite easily. But the CD player still wasn't working.I decided to replace the other 2 electrolytic caps in the start up muting circuit and all good. The 33uF cap was also dead but didn't bulge so I initially dismissed it as the problem.
If only the tops of the caps blew every time.
Might have a go at recapping the entire player when time permits.Cheers,Luke