EC8010 said:
Hi.
I cannot get this link to work.
Any ideas???
Has any one successfully downloaded it??
If so, please post to :- http://www.yourfilelink.com/
And I can download from there if you post the url
Andy
Sounds like real fun 
Let me tell you want I might want to do to my CD-5400:
- replace opamps with AD8620
- remove muting, and maybee replace it with a relay
- remove or replace out caps.
- replace dac with a CS4398
- do some power supply tweaks
- replace crystal stuff
I guess, I'll first replace the opamps. But I'll take it slowly
Let me tell you want I might want to do to my CD-5400:
- replace opamps with AD8620
- remove muting, and maybee replace it with a relay
- remove or replace out caps.
- replace dac with a CS4398
- do some power supply tweaks
- replace crystal stuff
I guess, I'll first replace the opamps. But I'll take it slowly
I intend to start by improving the clock - that's a serious weakness. I might replace the muting with relays, and might well replace the coupling capacitors. I have a pair of AD8620, so they might go in. Frankly, the change that will make the biggest difference is the clock. Everything else is just polishing.
That's trickier. At first, I was worried that the micro was really the master clock, but if you look, it uses the 16.9344MHz clock that arrives on pin 46. But the circuit diagrams and data sheets don't make sense to me. According to the Rohm BU2630 data sheet, pins 7, 8, and 9 are determinedly digital inputs, yet the Marantz diagram shows them connected to analogue signals. Something is wrong here.
What we expect to find is some sort of a master oscillator, followed by a frequency synthesizer to allow that frequency to be varied. We expect that variable frequency to go to the CD motor servo to control the speed of data read off disc and we expect it to go to the DAC to allow the DAC to cope with data having a variable sample frequency. We would expect that when variable pitch isn't engaged that the multiplication ratio of the frequency synthesizer would be an integer (2).
What we expect to find is some sort of a master oscillator, followed by a frequency synthesizer to allow that frequency to be varied. We expect that variable frequency to go to the CD motor servo to control the speed of data read off disc and we expect it to go to the DAC to allow the DAC to cope with data having a variable sample frequency. We would expect that when variable pitch isn't engaged that the multiplication ratio of the frequency synthesizer would be an integer (2).
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EC8010 said:
Exactly what I found! So I'm not going nuts?
I dug a bit further and found that the pins are actually refering to TMP87PS71AF (IC71). There pins 34,35 and 36 are actually labled SDA, SCL and PLL, and this is the uC that controls the whole thing, and they are connected to a general purpuse IO pin. So I guess those are used to setup pitch stuff.
I guess, you can just leave it away
Might be some obfuscation in the manual to make it harder to understand?
So I guess, you'll just have to insert a fesh clock into the point labled "DSP" and cut the rest loose?
4real said:I guess, you can just leave it away
Might be some obfuscation in the manual to make it harder to understand?
The manual is certainly clear as mud.
There's only one way of proving it. Put a fixed 16.9344MHz clock in to feed the DAC and the controller and see if it works. Watch this space...
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