Audio Systems: Pioneer PD-M603, optical pickup, m603


Question
Hi, the 6pack cds go in and run through all but won't play any, says no disk. Can you help?

Answer
This can be an of the following:

ONE:  Dead or weak laser diode preventing any digital pickup from the disc.

TWO:  Optical pickup assembly badly out of alignment and focus also  preventing the pickup of the digital signal. Could even be the lens has fallen out of the pickup mechanism.

THREE: The servo mechanism inside the player is defective.

FOUR:  Broken motor or disc handling mechanism.

It must be looked at and analyzed by someone who can diagnose the details.

My guess would be number ONE. It is a very common cause.  A good diode will run for thousands of hours but some small percentage of them are only able to run a few hours before getting too weak to give a strong reflection off the disc.

Hope this helps.
C