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Old 11th June 2004, 05:34 AM   #1
nonos is offline nonos  Hungary
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Default Philips cd753

Hello,

I look for the Philips CD 753,723 schematic or service manual.
I would like to make a transport with this CD.

Can anybody help me?

Thanks
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Old 30th July 2009, 12:32 AM   #2
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Default cd723 service manual

Here you go.

:-)
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Old 6th December 2010, 08:59 PM   #3
UV101 is offline UV101  England
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Hi, did you manage to find a copy of this manual? I got quite a few on my links page but not this one and I'm about to modify one for a friend. If you have one, I'd be grateful Thanks :-)
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Old 17th December 2010, 08:43 AM   #5
UV101 is offline UV101  England
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Many Thanks :-)
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Old 14th April 2011, 08:14 PM   #6
JosM is offline JosM  Netherlands
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Could someone tell me what kind of modifications he has made? I'am also very interested in de CD 753.
Thanks a lot
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Old 14th April 2011, 09:24 PM   #7
UV101 is offline UV101  England
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Hi, I modded one of these for a friend. They are very very good as std. In fact they sound better than they look like they should.

I replaced the smoother in the psu (+10v before the reg) with much larger 22,000uF Panasonic TSUP's, Built a separate +/-12v regulated supply for the opamp stage and replaced the opamp with a LME49720HA, split the 5v rails for the DAC and fed with 3 independent regulators. I replaced lots of decoupling caps with Rubycon ZA's.

On the transport, I replaced the clock with decent oscillator powered from a low noise reg and replaced several caps with ZA's again.

I'm sure I did something with the elco's in the signal path on the output but I cant remember what!!!

The result was stunning. This player looks like a low end toy but would seriously give some "hi-fi" a run for its money with mods.
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When Bitstream came out, I thought, “my God, what are we going to do...?” Ken Ishiwata http://www.hifisounds.co.uk
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Old 15th April 2011, 08:30 PM   #8
JosM is offline JosM  Netherlands
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Thanks for your comment. I will replace the opamp with a LM4562 and I recognise many of your mods.
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Old 4th May 2011, 06:53 AM   #9
UV101 is offline UV101  England
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I found a couple of pics showing the mods I did. Clock with decent reg, big caps on the rails, lots of small ZA caps for local decoupling and 3 separate regs on the dac. Oh and the opamp

Click the image to open in full size.Click the image to open in full size.
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When Bitstream came out, I thought, “my God, what are we going to do...?” Ken Ishiwata http://www.hifisounds.co.uk
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Old 5th May 2011, 08:20 PM   #10
JosM is offline JosM  Netherlands
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Very impressive. I have still a modification for you. You could remove the "mute" transistors at the output of the opamp. It is known that these transistors influences the sound, produced by the CD player.
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