Has anyone ever run across a schematic for one of these players? I've got a hold of one that I'm trying to resurrect. It has the dreaded "dying laser head" syndrome, where it plays erratically or not at all...
I have a head or two out there to try and buy, but what I also am interested in doing is hack into the CD transport to DAC board interface, find the data lines, and be able to use the DAC directly.
Have a RPi running Moode as a nice little WiFi music player... direct I2S interface to a well thought of $3000 CD player of 17yrs ago would be a nice thing. 😎
So, any info on this player in particular, or, was there a common pinout from common Phillips CD transports to the rest of a player? It is a Phillips VAL1250/VAM1250 transport assembly. I hear Resolution rolled their own servo board, so maybe the 26p ribbon connector in there isn't some easily discovered standard pinout, but maybe knowing a standard would help with the reverse engineering...
I have a head or two out there to try and buy, but what I also am interested in doing is hack into the CD transport to DAC board interface, find the data lines, and be able to use the DAC directly.
Have a RPi running Moode as a nice little WiFi music player... direct I2S interface to a well thought of $3000 CD player of 17yrs ago would be a nice thing. 😎
So, any info on this player in particular, or, was there a common pinout from common Phillips CD transports to the rest of a player? It is a Phillips VAL1250/VAM1250 transport assembly. I hear Resolution rolled their own servo board, so maybe the 26p ribbon connector in there isn't some easily discovered standard pinout, but maybe knowing a standard would help with the reverse engineering...
The transport doesn't matter. You can ignore everything before the digital filter, a PMD100 according to the CD55 user manual. All that is needed is to provide the filter with data in an acceptable format and away you go. Admittedly an oversimplification but it gives you the general idea.
Any info on the interface at the CD Transport side? I seem to remember long ago people adapting computer CD drives to DACs.
From a first look at the PMD100 data sheet , it seems settings/clocking info needs to be changed for different bit/data rate files, ergo some detection and switching upstream?
Trying to get a handle on the easiest way to go from my I2S source into this thing.
From a first look at the PMD100 data sheet , it seems settings/clocking info needs to be changed for different bit/data rate files, ergo some detection and switching upstream?
Trying to get a handle on the easiest way to go from my I2S source into this thing.
I bought 3 replacement transports on E-pay for this player and none of them worked. Bad luck really. As to the opinion that transport doesn't matter well , Opus 21 works quite a bit better with ancient Sony ES as a transport (in a dac mode) than with it's own drive. Also the variable output is quite a bit worse than a DIN fixed one. Having said that it's a really nice player and I'm going to stick with it.
Once the PMD100 is set it is set. What you need to know is what it is set to. Hardware mode or software mode. MCLK at 256Fs or 384Fs. 16 to 24-bit left justified or 16 bit right justified audio data. Also be aware that the PMD100 does not accept I2S. The one bit offset of SD relative to WS has to be removed turning into left justified data.
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