ibbotsnm
Guest
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 Posted:
Sat Jun 04, 2005 7:27 pm Post subject:
Denon CD Player/Receiver UD-M5 |
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jakdedert Wrote:
| Quote: | ibbotsnm wrote:-
I have a Denon UD-M5 3 CD player that at first sight appears to hav
a
Lasar problem in that it will not play CDs. The Amplifier is working
OK when the unit is operationg in the Tuner mode. I have noticed
that the head is moving, hunting for the start position on what ever
disc and track it is commanded to play, however, it does not appear
to pick up alignment information. If I persist , then the player
bursts into sound occassionally, playing faultlessly untill the end
of the disc is reached. It will also always indicate correctly the
number of tracks that any one disc has indicating that it is able to
read the indexing sector of each disc. although it has problems in
locating the start position. Can anyone please help in A.
identifying what the problem
is
B. Suggest how the unit can be re-aligned if that is
the problem
I have noticed that the unit does not appear to have any drive belts
that might slacken. It also has a very complex disc load mechanism.
Many thanks for any help you can give.-
I had an old Technics player (only) which had the same sort of problem
I
*slightly* tweaked the PLL trimmer and cured it. It's still a littl
picky
about what disk it wants to play, sometimes; and is more prone t
skipping
than I'd like. It does work 98% of the time now, though, compared t
about
10% before.
If you go this route, do a thorough cleaning first, that alone may fi
it.
Then mark *everything* so that you can get it back to square one i
case of
no improvement. Only make almost infinitesmal adjustments and chec
for
functionality after each tweak. If you get it working, try t
triangulate
the proper range of adjustment by continuing to go 'too' far, and the
back
off to the middle of the range between not working in one direction
and not
working in the other.
I didn't think I had anything to lose, and was ready to chuck the thin
if
it didn't work out. Instead, I got a (mostly) functional unit whic
has
worked for many years with just one small tweak...seriously, I hit i
the
very first time...about a 5 degree turn of the pot.
YMMV...oh yeah, be sure to read the FAQ on CD repair before you d
anything.
jak
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Thanks JAK for your swift and very helpful reply. I have just sen
off for the service manual for the Denon so hopefully I will be able t
identify the PLL circuitry when it arrives.
Norma
--
ibbotsnm
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Steve Hatch
Joined: 01 May 2006
Posts: 1
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Mon May 01, 2006 9:47 pm Post subject:
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Did you manage to get the manual for this unit? I was having the same problems with the laser and decided to buy a donor unit from ebay.Having fitted the laser I somehow manged to lose the sound from the unit completely, so I'm in desperate need of schematics for this unit.
Many thanks,
Steve. |
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