"Mark Zacharias" ) writes:
"Arfa Daily" wrote in message
...

"Gaetan Mailloux" wrote in message
...
Hello

A friend of mine do have a kenwood DP-460 cd player with a cd playing
problem.

My friend was sure that the laser was burned, but I
decide to test his Kenwood cd player, wen I use commercial music cd it
work perfect, but wen I use burned cd-r music, this Kenwood cd player can
not play more than 7 track, after 7 track it do jerky sound with the
music, it look like it can not follow those track.

Any hints of what could be the problems ?

Here is a link to a part of the schematic of the kenwood DP-460 cd
player.

http://img101.imageshack.us/img101/4...60smallfy3.jpg

Thank

Bye

Gaetan


Likely to be poor laser performance. CD-R discs are nowhere near as
reflective as commercial 'pressed' types, and many players that were not
specifically designed to cope with them, struggle, particularly if the
laser is marginal, or even dirty. Have you, as a first move, tried
cleaning the lens ? (properly with alcohol etc, not a cleaner disc).

As you get further into a disc, its rotational speed falls to maintain
CAV. If the performance of the spindle motor is anything less than
perfect, its speed can be minutely erratic. If the performance of the
laser is down as well, then when you combine these factors, which are
typically present in any player older than a few years, the result tends
to be poor tracking performance / general playability problems on late
tracks, and this will be exacerbated by use of CD-R discs.

Arfa



************************************************** ******
Have you, as a first move, tried cleaning the lens ? (properly with alcohol
etc, not a cleaner disc).


I agree - the OP should definitely clean the laser. Other maintenance, such
as cleaning and lubricating other moving parts - rails, gears, motor
spindles, etc, is also indicated. If after cleaning and maintenance issues
are resolved the problem persists, another brand of CD-R's might help, or
the laser may just be deteriorated to that point, especially if in a dusty
and/or smoky environment.

As you get further into a disc, its rotational speed falls to maintain
CAV.

Perhaps because audio CD's are CLV...

;-)


Mark Z.



Hello

Cleaning the laser lens and lubricating the mechanicals was the first
thing I have done.

I did try other cd-r brand but the problems still there.

Maby the laser are at the end of his life ?

Thank

Bye

Gaetan