I have a Marantz CD85 and like it very much. It have been working fine until recently.
When I power up the CD player and play a CD immediately, there will not be any audio output. After 30 secs, the CD player's output relay will make a lot of noise for about 2. It maybe trying to latch. After which, the output relay will stop making noise. And there will be audio output. I have replaced the relay also changed some e-caps around the relay but it still have the same problem.
Anyway encountered such problem?
Need some advise and thanks in advance.
When I power up the CD player and play a CD immediately, there will not be any audio output. After 30 secs, the CD player's output relay will make a lot of noise for about 2. It maybe trying to latch. After which, the output relay will stop making noise. And there will be audio output. I have replaced the relay also changed some e-caps around the relay but it still have the same problem.
Anyway encountered such problem?
Need some advise and thanks in advance.
relay problemHi
Hi kokkeong, I have come across this problem before, but on a marantz cd80..
I don't know your tech abilities but this fault was difficult to trace.. basically in our
case the small capacitors that tuned the 11.2896 meg crystal in the saa7220
filter chip were too large at 27pf this was because philips had used basically the same values throughout a whole range of players but had forgotten that in those players with a ground plane the capacitors were added to in value by a few pf's now what this
did was reduce the amplitude of the clock to around the threshold level for stable
operation with ageing of crystal etc the clock amplitude became too low so the
solution was to reduce these 27pf caps to around 18pfs but use polystyrene
caps for a higher Q thus increasing the clock amplitude and solving the problem
I offer this as a possible solution, of course there may be other factors to consider
but hope this helps. regards
Hi kokkeong, I have come across this problem before, but on a marantz cd80..
I don't know your tech abilities but this fault was difficult to trace.. basically in our
case the small capacitors that tuned the 11.2896 meg crystal in the saa7220
filter chip were too large at 27pf this was because philips had used basically the same values throughout a whole range of players but had forgotten that in those players with a ground plane the capacitors were added to in value by a few pf's now what this
did was reduce the amplitude of the clock to around the threshold level for stable
operation with ageing of crystal etc the clock amplitude became too low so the
solution was to reduce these 27pf caps to around 18pfs but use polystyrene
caps for a higher Q thus increasing the clock amplitude and solving the problem
I offer this as a possible solution, of course there may be other factors to consider
but hope this helps. regards
Thank you very much
Dear Humble,
I have been busy with work and have not been checking my private email. I would like to thank you very much for your advice to my problem. I will give it a try if I have the time. Thanks once again.
Best regards,
Kok Keong
Dear Humble,
I have been busy with work and have not been checking my private email. I would like to thank you very much for your advice to my problem. I will give it a try if I have the time. Thanks once again.
Best regards,
Kok Keong
I know this problem..
If the mute relais cirquit is the same as in the CD80 than you have to look at the DC level on the output at first.
The CD 80 have a DC protection like in poweramps end delay at power on, the detection use a lot of transistors and comparators and maybe the problem is in this cirquit. Otherwise you can ground the sense point of the four 4.7Mohm resistors to kill this cirquit.
from every output is a sense resistor of 4,7M to one point.
If the mute relais cirquit is the same as in the CD80 than you have to look at the DC level on the output at first.
The CD 80 have a DC protection like in poweramps end delay at power on, the detection use a lot of transistors and comparators and maybe the problem is in this cirquit. Otherwise you can ground the sense point of the four 4.7Mohm resistors to kill this cirquit.
from every output is a sense resistor of 4,7M to one point.
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