3- disc CD changer problem

[moonlite]

Every time I load a disc, the disc won't spin until I give it a tiny
spin by hand. When I spin the disc just a little, it will start
playing fine without any problems. Nothing is broken (mechanically at
least). Could this be an indication of a bad/weak laser ? If the laser
was bad, then it won't read, period. I appreciate your opinions.

moonlite

 

[N Cook]

Every time I load a disc, the disc won't spin until I give it a tiny
spin by hand. When I spin the disc just a little, it will start
playing fine without any problems. Nothing is broken (mechanically at
least). Could this be an indication of a bad/weak laser ? If the laser
was bad, then it won't read, period. I appreciate your opinions.

moonlite

Does it try and start every time?
Does it sometimes work and other times not at all until you spin it?

The first maybe bearing problem or lack of drive, try reducing the top clamp
force to see if that temporarily improves it.
Second case , one armature winding inoperative due to crud on commutator or
o/c winding

Not a laser problem , i would say, unless it spins up and fails to read the
TOC track.

 

[Mark D. Zacharias]

Every time I load a disc, the disc won't spin until I give it a tiny
spin by hand. When I spin the disc just a little, it will start
playing fine without any problems. Nothing is broken (mechanically at
least). Could this be an indication of a bad/weak laser ? If the laser
was bad, then it won't read, period. I appreciate your opinions.

moonlite

Most likely - a shorted spindle motor. You've rotated it past the shorted
brush, so it starts to rotate. The motor is drawing too much average current
in this condition, so you should not continue to play it this way.

The motor brushes can often be cleaned out. One must understand how small
motors are constructed.

One can spray some cleaner / lubricant into the little slits at the bottom
of the motor, aimed at the point where the brushes touch the commutator. Do
this while rotating the motor, and it helps to use an air compressor to blow
out excess cleaner etc from the motor. It is often necessary to repeat the
process several times to clear the short.

Another method is to run the motor from an external power supply at a
higher-than-normal voltage, say 6 to 9 volts, and "burn" the short out. My
thought is the short is more likely to recur this way.


Mark Z.

 

[Golf]

Most likely - a shorted spindle motor. You've rotated it past the shorted
brush, so it starts to rotate. The motor is drawing too much average current
in this condition, so you should not continue to play it this way.

The motor brushes can often be cleaned out. One must understand how small
motors are constructed.

One can spray some cleaner / lubricant into the little slits at the bottom
of the motor, aimed at the point where the brushes touch the commutator. Do
this while rotating the motor, and it helps to use an air compressor to blow
out excess cleaner etc from the motor. It is often necessary to repeat the
process several times to clear the short.

Another method is to run the motor from an external power supply at a
higher-than-normal voltage, say 6 to 9 volts, and "burn" the short out. My
thought is the short is more likely to recur this way.

Mark Z.

I ditto what Mark said. A blast of contact cleaner while the motor
rotates may resolve this problem.

 

[moonlite]

I ditto what Mark said. A blast of contact cleaner while the motor
rotates may resolve this problem.- Hide quoted text -

- Show quoted text -

Thank you very much gentlemen. You were a great help. I will try your
suggestions.

moonlite