One of my cdm4/19 (sourced from a Marantz CD41 player) has an annoying quality: it's a good bit louder when playing when compared to others...
The problem manifests itself like the increased spindle motor noise when playing.
The interesting thing is that it's noisiest when playing original (pressed) CDs, and relatively quiet (normal) when playing cdr and cdrws which leads me to believe noise is reflectabillity-related...
The mech itself works great and reads everything with no problem. It doesn't need much trimming to achieve the 50mV laser current optimum, from which I can conclude that the laser itself isn't in a bad shape.
So far, I have lubricated the spindle motor, transferred the arm to another (good) cdm4/19, switched players, but to no avail...
My last thought would be that some of the smd element/s on the arm itself has gone bad, but apart from resoldering them, I haven't done anything else about that (I'm not very optimistic about changing smd elements on a flex foil
).
Searching the board, I've found only one reference to the problem, but in an unrelated thread: http://www.diyaudio.com/forums/showthread.php?postid=872929#post872929
I would be grateful to any fresh insights.
Cheers!
The problem manifests itself like the increased spindle motor noise when playing.
The interesting thing is that it's noisiest when playing original (pressed) CDs, and relatively quiet (normal) when playing cdr and cdrws which leads me to believe noise is reflectabillity-related...
The mech itself works great and reads everything with no problem. It doesn't need much trimming to achieve the 50mV laser current optimum, from which I can conclude that the laser itself isn't in a bad shape.
So far, I have lubricated the spindle motor, transferred the arm to another (good) cdm4/19, switched players, but to no avail...
My last thought would be that some of the smd element/s on the arm itself has gone bad, but apart from resoldering them, I haven't done anything else about that (I'm not very optimistic about changing smd elements on a flex foil

Searching the board, I've found only one reference to the problem, but in an unrelated thread: http://www.diyaudio.com/forums/showthread.php?postid=872929#post872929
405man said:I have a CD player that uses a Philips CDM4/!9 and when playing original CDs there is a chirping noise from the mechanism which is disc speed related when I play copied CDs the noise is considerably reduced or not present at all. This suggests that there is a difference in the amount of work the servo does with different discs. I have not yet had a chance to investigate further
Stuart
I would be grateful to any fresh insights.

Cheers!