Philips Expanium 200 CD/MP3 Player, Motor not spinning.

[ohdev83]

I have a Philips Expanium 200 CD/MP3 Player, it was working Ok, but suddenly and without any prior problems,
the motor stopped spinning.

I tested the Motor seperately and it's working OK.

attached are two screenshots of the board from the two sides.

PS: the motor connector is the 6 pins connector beside the volume control.

any idea what may be wrong?

thanks in advance.

 

[sky_123]

It's probably still the motor. They get a bit cloggy after 10 years or so, due to the grease or something. Did you check the motor with something a bit less than the supply voltage of the CD player? e.g. if the CD player voltage is 3V, check with (say) 2.7v, and with a small resistor (maybe 10 ohms) in series.
If it doesn't turn, then clean the motor a bit.

 

[betwixt]

The motor drive circuits are quite complicated. In a CD (or DVD) player, the motor speed has to be adjusted by the player according to how far the reading laser is from the edge of the disk. As the diameter of the 'track' changes the rotational speed has to change in order for the bit rate to remain fairly constant. On a working player you can clearly see this by watching the disc spin while selecting first and last tracks.

Because of this, the motor is usually driven by a sequence of pulsed currents into several windings, that's why there are more than two wires to the motor. The pulse rate is decided by a calculation based on the present head position so software is involved. The problem may be electrical, in which case the motor drive IC would be first suspect but it could also be a failure of the micro-controller or a speed feedback mechanism. Sadly, it probably isn't worth repairing, the parts are almost certainly custom to that model and not available individually anyway. You might be able to get a complete replacement board from Philips but the price might be several times more than a new player.

Brian.

 

[ohdev83]

It's probably still the motor. They get a bit cloggy after 10 years or so, due to the grease or something. Did you check the motor with something a bit less than the supply voltage of the CD player? e.g. if the CD player voltage is 3V, check with (say) 2.7v, and with a small resistor (maybe 10 ohms) in series.
If it doesn't turn, then clean the motor a bit.

Dear Sky_123,
it's not the motor, as i tried it before, and 5 years ago it wasn't working, so it's not something new.
thank you.

---------- Post added at 03:14 ---------- Previous post was at 03:11 ----------

The motor drive circuits are quite complicated. In a CD (or DVD) player, the motor speed has to be adjusted by the player according to how far the reading laser is from the edge of the disk. As the diameter of the 'track' changes the rotational speed has to change in order for the bit rate to remain fairly constant. On a working player you can clearly see this by watching the disc spin while selecting first and last tracks.

Because of this, the motor is usually driven by a sequence of pulsed currents into several windings, that's why there are more than two wires to the motor. The pulse rate is decided by a calculation based on the present head position so software is involved. The problem may be electrical, in which case the motor drive IC would be first suspect but it could also be a failure of the micro-controller or a speed feedback mechanism. Sadly, it probably isn't worth repairing, the parts are almost certainly custom to that model and not available individually anyway. You might be able to get a complete replacement board from Philips but the price might be several times more than a new player.

Brian.

Dear Brian,
before anything thank you for always giving others a brief about how things work, this is really useful.

the motor itself has only two wires, the other wires go to the lens and the motor responsible of moving the lens.

i will give it a try and send it to a person i know who is used to fix Playstations, maybe he can fix it.

thanks again.