CD player won't recognize disc

JCBANVILLE

unread,

Jan 21, 1998, 3:00:00 AM1/21/98

to

My NAD 502 player doesn't know that I've inserted a disc. I'm in the process of
changing the display bulb and now this. When you insert the disc, It just sets
there instead of spinning for a couple of seconds, and the display says DISC,
as if no disc was in it. I used my multimeter to check all the connections for
continuity around the light bulb and others. I can't find the problem. Any
ides?

thanks
Jim

Jim Bennett

unread,

Jan 21, 1998, 3:00:00 AM1/21/98

to

You need to carefully check all of the connectors to see if you didn't
accidentally pull one a little loose. Also, it's possible that you might
have displaced a mechanism switch that tells the system control that the
door is closed or the laser is at the start position.

BTW, this is simply a generic answer based on the models that I've seen and
the more common possibilities. I've not worked on that specific model.
--
Jim Bennett
*For non-commercial reply by E-mail, delete "removethis" from my address.*
===========================================================
JCBANVILLE wrote in message
<19980121233...@ladder01.news.aol.com>...

JCBANVILLE

unread,

Jan 22, 1998, 3:00:00 AM1/22/98

to

I mixed-up a couple of connectors on the board. It works!!!

Jim

Alhermes

unread,

Jan 22, 1998, 3:00:00 AM1/22/98

to

>I mixed-up a couple of connectors on the board. It works!!!
>
>Jim
>
>
>

Congrats! However, I seem to have a problem with a CD that I had printed
through Martin Audio (in Seattle, I think... our mastering engineer did the
dirty work).

It seems that it won't play in some players (even brand new ones), but it does
just fine in others. It plays in most portable, Discman-type units, but often
times not in a changer, or some "boomboxes".

Is this a common problem, or did I get unnecesarily shafted?

Is there an explanation/solution?

Thanks!

Aaron Hermes

Dan Barlow (GraySoul)

unread,

Jan 22, 1998, 3:00:00 AM1/22/98

to

Alhermes wrote:

> It seems that it won't play in some players (even brand new ones), but it does
> just fine in others. It plays in most portable, Discman-type units, but often
> times not in a changer, or some "boomboxes".

if you're brave, try darkening the edge (not the surfaces!) of the CD
with a permanent marker. Some brands of substrate (the clear plastic
part) suffer from edge reflections and this will fix it.

Otherwise, think about whether the artwork could be off balance enough
to wobble on players with weak spindle mounts? we ran into that with
CD-ROMs, spectacularly with Microsoft Office.

Richard D Pierce

unread,

Jan 23, 1998, 3:00:00 AM1/23/98

to

In article <34C7F9...@radix.net>,

Dan Barlow (GraySoul) <danb...@radix.net> wrote:
>Alhermes wrote:
>
>> It seems that it won't play in some players (even brand new ones), but it does
>> just fine in others. It plays in most portable, Discman-type units, but often
>> times not in a changer, or some "boomboxes".
>if you're brave, try darkening the edge (not the surfaces!) of the CD
>with a permanent marker. Some brands of substrate (the clear plastic
>part) suffer from edge reflections and this will fix it.

Wrong. Edge reflections cannot have the effect you claim. Do not use an
edge marker.
--
+---- Dick Pierce ---------------------------------------------+
| Professional Audio Product Development |
| Transducer Design and Measurement |
+---- (781) 826-4953 (Voice and FAX) DPi...@world.std.com -----+