From: JERONI.PAUL@terra.es   
      
   I am looking at the CD player part of an Aiwa CX-N500Z (NSX-500), many times   
   does not focus when a disk is loaded, but retrying sometimes starts and plays   
   the disk perfectly all the way.   
      
   I have swapped the entire optical pickup assy from an identical working unit   
   and the problem is in the drive electronics, not the pickup. Both pickups work   
   fine one one unit and both fail the same way in the other.   
   Mostly Sony parts, pickup: KSS-210A, ICs: CXA1081A, CXA1082BQ, CXD1167Q,   
   BA6296FP.   
      
   I have scoped some signals, when it its trying to focus the FOCUS-OK signal   
   from CXA1081A activates momentarily but nothing happens, this should trigger   
   the servos and start of spindle motor. Sometimes the focus locks and disk   
   starts to spin and    
   suddently loses focus for no obvious reason. However while playing it does not   
   lose focus easily, buttons FF or REW behave fine, but jumping tracks sometimes   
   cause it to lose focus.   
      
   A secondary sympthom (maybe related) is when playback is stopped through the   
   stop button, the sled returns home and at the end the sled gears slip some   
   teeth because the inertia, the motor does not brake in time. BUT if playback   
   is stopped with the stand-   
   by button instead, it does the same without teeth slippage, because it brakes.   
   I ran some tests shorting the switch contacts and with the Stop button the   
   sled moves some extra millimeters due to inertia. I can't explain how the   
   BA6296FP can stop the    
   motor without brake as its MUTE signal is wired to Vcc.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)