I
ian
Guest
Hi folks, I have a c.d. player in the workshop that died a couple of
weeks ago, it is a Sharp model CMSR70CDX(GY). The l.c.d. panel just
flashes "CD" & then goes to error. Opened it up today & found that the
spindle drive doesn't start. It just moves a few degrees & stops. If
it is helped to rotate with a finger, it speeds up, achieves focus
lock & plays all tracks. Disconected motor & checked with an ohm
meter, seems to be 3 equal windings. put a 1.5v AA on the motor & it
spins up with a CD on the spindle with no problems. Measured the
voltage on the motor both when trying to start, & running, about 0.7
volts. Disconected motor & terminated leads in an 18 Ohm resistor &
still only 0.7 v. Would have thought this was low, but as the unit
works when spun with a finger, maybe the voltage is O.K. My thoughts
now are that the supply impedance is too high, & the motor can't draw
enough current to get started. Any help GREATLY appreciated,
particularly if someone has a circiut of the spindle motor drive.
Possibly any Sharp CD circuit would help. I haven't checked the Web
for a circuit, but will do tonight. Any advice will also be of
benefit.
T.I.A. ian sutherland. (To mail me, remove both spams & dot au)
weeks ago, it is a Sharp model CMSR70CDX(GY). The l.c.d. panel just
flashes "CD" & then goes to error. Opened it up today & found that the
spindle drive doesn't start. It just moves a few degrees & stops. If
it is helped to rotate with a finger, it speeds up, achieves focus
lock & plays all tracks. Disconected motor & checked with an ohm
meter, seems to be 3 equal windings. put a 1.5v AA on the motor & it
spins up with a CD on the spindle with no problems. Measured the
voltage on the motor both when trying to start, & running, about 0.7
volts. Disconected motor & terminated leads in an 18 Ohm resistor &
still only 0.7 v. Would have thought this was low, but as the unit
works when spun with a finger, maybe the voltage is O.K. My thoughts
now are that the supply impedance is too high, & the motor can't draw
enough current to get started. Any help GREATLY appreciated,
particularly if someone has a circiut of the spindle motor drive.
Possibly any Sharp CD circuit would help. I haven't checked the Web
for a circuit, but will do tonight. Any advice will also be of
benefit.
T.I.A. ian sutherland. (To mail me, remove both spams & dot au)