"SY Chun" wrote in message ...
Can any one help me with my CD player? It's a Sony component CD player that uses KSS-240 pickup. My problem is, as soon as the player is powered on, the lens head will be immediately starting whacking up and down, something like machine gun fires. The objective lens overshoots and hits, making a sound somewhere like 10hz beating/whacking sounds. It won't stop until powered off. Does anyone know how I can fix this?

Thanks a lot,

SY

If the player has what's called ( by Sony ) a ' B ' board mounted immediately under the deck, with the spindle and sled motors soldered straight into it, look for 3 or 4 surface mount electrolytics along one edge - there's various versions of this board.

I think that they are 47uF as I recall. They commonly go open circuit, but also, one of them is prone to actually leak, and the electrolyte usually attacks a nearby through plated hole, which must then be ' wired around '. It is ESSENTIAL that the caps are replaced with similar surface mount types. Ordinary wire ended types WILL NOT work. All of these caps are on pins of the servo processor IC, and the symptoms you describe are typical of their failure.

Arfa