Re: portable dvd player audiosonic. fault . spindle motor not turning. model KM0502


"Meat Plow" <meat@xxxxxxxxxxxxxx> wrote in message
news:pan.2007.03.21.16.44.39.881480@xxxxxxxxxxxxxxxxxxxxxxxxxx
On Wed, 21 Mar 2007 14:50:15 +0000, Arfa Daily wrote:


"mark krawczuk" <krawczuk65@xxxxxxxxxxx> wrote in message
news:46011bdb$0$98626$c30e37c6@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
hi , i have a audiosonic portable dvd player , model KM0502.

the problem with it is , is that when u insert a dvd disc ,it doesnt
turn, the laser moves ok, and it says " disc not inserted "
i then connected a 1.5 volt battery to the motor , and it turned ok.

so i presume the power supply section on teh pc board is damaged.

would it be possible to make up a simple reg supply just for the motor
?
the thing is , i dont have a clue as to what voltage the motor is ?

anybody know ?

thanks,
mark k


I'm afraid your diagnostic logic is way off beam here. The fact that the
disc does not spin up, is not a sign that either the motor, or its drive
/
power supply circuitry is faulty. Most likely, the laser is not obtaining
focus, so the spindle motor servo is not being turned on by the system
control micro. First ensure that the sled drive is working correctly by
manually moving the laser out towards the disc edge, then reclosing the
door. Open it again, and ensure that the laser has 'homed' back to the
disc
centre. If this checks out ok, try a CD in the player, rather than a DVD.
If
a CD plays, but not a DVD, suspect a defective laser ( although not
always ). If neither type of disc plays, then you likely have a digital
processor / decoder problem. Either of these problems probably render the
unit landfill, unfortunately ...

Arfa

So the laser focuses before the disc spins up?


In most cases, yes. Sometimes, if focus cannot be obtained on the first try
sequence, the spindle servo will pulse the motor a little, to rotate the
disc a few degrees, before trying again, in case it was trying to read
through a jammy fingerprint. Some players just go ahead and spin up the disc
and look for a focus lock, followed by any old data coming off the disc,
that they can then get spindle and tracking servo locks on, but by and
large, the sequence is :- check optical block is home, if yes, turn on laser
and initiate focus search. When focus lock obtained, turn on spindle and
tracking servos. Read data and use to fine tune servos. Read and display
disc menu or TOC.

Arfa


.

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