Sy,

Besides driver IC's and clocks, you could have a very noisy power
supply. You'll need to look at the supplies with a scope.

Regards again,
Tim


SY Chun wrote:

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