CDX no sound

6 replies
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beka (archived2)
Bronze
Posted February 23, 2017 at 13:58 GMT
#2205867

Hi,

after two radio-shops failed to repair my cdx last year I will meet the challenge and took it from the storage shelf. Although having no electronic skills.

I checked the griplets as recommended in some posts and found them already done. With little pieces of wire as described here. And I checked the connections to the next points in the circuit, there is contact.

But nevertheless no sound. What else can I control? I read something about a mute relay. I couldn't find it.

In the diagram of the decoder board is the IC 6514 with  a mute control. Is this perhaps the reason for the problem? How can I check this? Or is it better to find another board and just change it. If anybody has such a spare part.

Hope that anyone has a helpful hint.

Bernd

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chartz (archived2)
Bronze
Posted February 23, 2017 at 15:43 GMT
#2205868
Hi,

The relay is a double reed-contact one.

It is located right next to the output, accessible underneath the player. It is a white plastic core with the reed contacts passing through its coil.

Just check there is audio between the output caps and the reed contacts. Or just short the contacts while playing ! Looks like this one (although from a Philips player).

Funny coincidence, I am going to buy reed switches tomorrow for my Philips CD300! 😎
B(
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beka (archived2)
Bronze
Posted February 23, 2017 at 21:46 GMT
#2205869

Thank you chartz for your quick answer. I will see at weekend if I am able to convert your advice into practice.

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beka (archived2)
Bronze
Posted February 27, 2017 at 23:50 GMT
#2205870

Now I shortened the contacts, but unfortunately no success. Any other idea?

C(
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chartz (archived2)
Bronze
Posted February 28, 2017 at 17:29 GMT
#2205871

beka wrote:

Now I shortened the contacts, but unfortunately no success. Any other idea?

Have you checked the PSU voltages? 

B(
Offline
beka (archived2)
Bronze
Posted February 28, 2017 at 22:00 GMT
#2205872

I had not, but now I have! You see, I'm a bloody amateur and can only go further on guided step by step.

Sorry!

With the help of my service manual I checked the voltages and found them nearly ok. 11.8 instead of 12, 17.9.. instead of 18  etc. Is that in the normal tolerance?

Bernd

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