I have run thru the solders on the drive board and elsewhere.
The drive is fine when it runs and the "tilt" is a specific angle and
repeatable with bumping and jarring having no effect.

I am suspecting that it has something to do with the laser itself
since the fix (tilt) is so repeatable. It is definitely on the deck.
I checked out all the switches and the board on the deck removing and
replacing all connectors.

Apparently the electronics need feedback from the laser to tell it
there is a CD in the deck before it will generate the drive for the
spindle. Is this correct???

Therefore the Laser needs to see a reflection. So if the laser is
tipped, the reflection won't hit the right spot on the assy. I see
only a movement, apparently controlled by coils, that adjusted the
laser along the radius of the CD.

When it does play, I see the sled shaking back and forth as if
following the CD. Shouldn't the laser itself be moving by the coils
mentioned above. I think this deck has three lasers to control
tracking. I have no idea how this works. I only see one lens.

thanks for the responses.


On Sun, 31 Dec 2006 10:43:44 GMT, "Arfa Daily"
wrote:


wrote in message
.. .
I have a Sony CDP-302 player
this is an old, ~1986, high end player.
It playes very well --- as long as it is tipped to and angle of 45° or
greater on either side. Not 40°, but 45°, maybe 43°. I measured it.
If I tip it from 40° to 45° it will start working. No bumping or
jarring required.

If it is flat or tipped to any angle front to back, the spindle motor
won't operate. The spindle motor circuit doesn't get any drive
signal.
I traced it back to the electronics board and something is shutting
down the generation of the signal. The problem is on the CD carriage,
because I loosened the electronics board and tipped them seperately.

The spindle motor is an open DC type. Coils are on the PC board with
the magnet attached to the bottom of the spindle. NOTHING appears to
be loose or jammed. All micro switches seem to be operating in all
positions. It worked intermittently in the flat position for a while.

It is suppose to spin the CD on insertion or power on and read the
TOC, then stop and wait for the play button. It does this only when
tipped at the proper angle.

I don't have a schematic, but what would be position sensitive to
shut
down the drive signal?

thanks

That type of motor normally has many connections to the stator coils, which
are a comparitively heavy assembly in themselves. I would suggest that the
first move would be to resolder all of those connections, if you can even
get at them.

Arfa