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Old 10th October 2012, 05:44 AM   #11
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Thanks for your effort, tiefbassuebertr

I did intend to write a modules for NEC code and RC5 for my DIY system but I've probably forgotten how to program and it'll take days to get back into it. Can't remember why I started with Sharp.

I reckon if I fix the power supply and advise on the remote situation, I'll have done enough to return a favour.

There's a couple of shops with bins full of remotes down town I guess, so I'll keep an eye out for likely candidates.
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Old 11th October 2012, 01:44 AM   #12
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Not to be trusted absolutely, but a quick check shows both problems: mains and harmonics, and only odd harmonics of the 1k input. I've never seen 7H greater than 5H before. Perhaps some of it is a coincidental something else. THD measures .040% but some is due to the soundcard.

No ripples in the frequency response. It's a pity RightMark doesn't show phase.
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Old 12th October 2012, 04:39 PM   #13
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Cambridge Audio don't published service manuals and schematics. OTOH this is necessary to understand the unwanted observations concerning THD.

According the image from post #10 the main PCB (green color) looks like a PCB from an extremly cheap DVD player or MP3 player.

At least it is not a pure decoder board for PCM, as usual by older CD player models.

What are the exact namings from that PCB and the used MPEG audio video processor units ?

With help of this informations would it be possible to find out a more known model like this model from cambridge audio so as the datasheets of the used ICs.

And the next step is to order or download the appropriate schematics from the actually manufacturer of the main PCB.

Last edited by tiefbassuebertr; 12th October 2012 at 04:41 PM.
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Old 13th October 2012, 05:41 AM   #14
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Hi tiefbassuebertr

The board is marked CD36 which is another Cambridge model. There's no sign of it's original manufacturer. The CL8830 processor is for VCD, this one's Chinese but the datasheet for the original c-cube chip is available.

Output stage features 741-type opamps. The power supply includes a switched-mode 5V, other voltages are unregulated and high impedance. I can't see a reference or regulator on the main board either. My eyes are sore from trying to follow tracks...

If it were mine, it would be in the bin by now...or rather taken to my nearest authorised electronic waste disposal facility...

A replacement cap for the switcher's output has reduced the noise coming through the mute and kill circuits to the headphone amp, but it's still audible and now I can hear the turntable motor when paused, so I guess there's a ground problem somewhere.

It's trash, basically. It'll be a lot easier and cheaper for me to give the owner one of my own players.
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Old 13th October 2012, 02:31 PM   #15
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Quote:
Originally Posted by PlasticIsGood View Post
Hi tiefbassuebertr

The board is marked CD36 which is another Cambridge model. There's no sign of it's original manufacturer. The CL8830 processor is for VCD, this one's Chinese but the datasheet for the original c-cube chip is available.

Output stage features 741-type opamps. The power supply includes a switched-mode 5V, other voltages are unregulated and high impedance. I can't see a reference or regulator on the main board either. My eyes are sore from trying to follow tracks...

If it were mine, it would be in the bin by now...or rather taken to my nearest authorised electronic waste disposal facility...

A replacement cap for the switcher's output has reduced the noise coming through the mute and kill circuits to the headphone amp, but it's still audible and now I can hear the turntable motor when paused, so I guess there's a ground problem somewhere.

It's trash, basically. It'll be a lot easier and cheaper for me to give the owner one of my own players.

Datasheet is here:
CL8830 pdf, CL8830 description, CL8830 datasheets, CL8830 view ::: ALLDATASHEET :::

an other player where this IC is in use is follow:
这个就是我飞利浦解码的 步步高 丽声超级VCD - 音响DIY论坛 - 中国音响DIY
Technische Detail des AD-N212 !!! - dvdboard.de Forum (AD-N212)
[ DVD.nl ] - Reviews DVD apparatuur
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