wrote in message
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On Oct 2, 6:18 am, "Arfa Daily" wrote:
"James Sweet" wrote in message

news:6gkMi.4857$Jk2.414@trndny03...





wrote in message
roups.com...
Hi Gents,

I have a rotel 865bx that has a problem. I have not worked on
players, so any help would be appreciated.

The problem is that after I insert a CD, and hit play, sometimes
the counter speeds up and the music sounds super fast. If I tilt the
player slightly, it sometimes stops. I have a couple of general ideas.

1) Alignment problem?

2) Intermittent that resolves when the pc board is flexed slightly?

3) Other?

Thanks.
Steve

If the pitch has gone way up, I would look at the oscillator driving
the
DAC, that's about the only thing that can affect the playback speed.

That ain't quite exactly so, James. If the player is 'skipping'
continuously, that can give the impression that it is going fast in the
same
way as when fast forward is pressed. Just about all 'standard' players
fast
forward by 'grab a block - skip five, grab a block - skip five etc '. If
the
player is really going fast as a result of clock trouble, the pitch of
the
playback sound will be altered, much as the pitch control alters things
on
disco CD decks. Otherwise, yes, I agree with you that it would have to be
a
clock issue.

Perhaps the OP could confirm what he means exactly by "super fast". If it
is
a rapid skip, as I suspect it might be, the very first thing is to make
sure
that it is not something really simple like a button-push issue, and that
the fast forward button is not being mechanically pushed somehow, in a
way
that gets resolved when the player is tipped / twisted. After that, it
would
be a case of removing the top, and observing the actions of the optical
block and its drive gears when the problem is occuring. The drive for the
sled should only be activated every 2 to 5 seconds or thereabouts. You
should see the drive gear rotate a few teeth, and then stop. No
overshoot,
no shuffling about. Overshoot is often a sign of mechanical issues with
the
sled sticking. Erratic behaviour or shuffling is often a sign of a weak
or
dirty laser. You might try cleaning the lens just for sport.

Other than that, it will be a case of just gently poking around the PCB
with
the butt end of a ballpoint pen, to see if you can locate an area which
instigates or clears up the problem when disturbed. It could of course be
an
issue internal to the laser, in which case, poking the PCB is unlikely to
yield a result.

Finally, do not be tempted to make any adjustments - mechanical or
electronic. Even if it has any adjustments - and many players don't now -
it
is unlikely that they would be the cause of the sort of problems that you
are experiencing, and adjusting them without an intimate knowledge of
what
they do, is likely to compound the original problem, and in the case of
the
laser power pot, may cause irreversible damage to the laser.

Arfa- Hide quoted text -

- Show quoted text -

Thanks gents. Sometimes it just sounds like Alvin for a whole song.
Other times one just hears a blip for an instant, sounds ok for
several seconds, and then blips again, randomly. Sometimes, I can lift
the player on one side and it reverts back to normal. I have cleaned
the optics, cleaned the CDs etc.

Again, thanks for your replies. It is much appreciated.
Steve


Open it up and poke around with a stick, ballpoint pen works well. Sounds
like a bad connection somewhere is causing a clock issue, could be a cracked
timing crystal as well.