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denon udm3
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jts1957



Joined: 24 Nov 2008
Posts: 2458
Location: Far, Far Away
PostPosted: Tue Oct 20, 2015 11:29 am    Post subject: Reply with quote
srestaino wrote:
Top of CD caddy with previous circuit board removed


If anyone can give me a pointer at least, that would be fantastic. It would be such a shame to have to throw out this stereo unit just because of what seems to be a small defect.

PS Apologies for the 'test post'. I don't seem to be able to remove it. Admins, feel free to do so.


Well, first you should have started your own thread. Second you say the mechanism works fine if the tray is opened / closed and disc installed manually.
In this picture, there are two boards. The one with two motors has a 'limit switch' that can become tarnished. Unsolder motor terminals, remove board and turn board upside down, pull clear plastic cover / insulator off leaf switch, burnish contacts and reassemble.
Second, just to the right there is a second board with a single motor and two 'tact' switches. The motor shaft probably has a worn belt and/or one or both 'tact' switches are failing to make reliable contact. Usually you can hear motor spinning trying to pull the tray fully closed or push it fully open as the worn belt 'slips.' Unsolder two joints on motor, remove the single screw and release the black plastic clip below it to remove board. Belt should be accessible from the top with the tray, I believe in any position other than fully closed.
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fredleon



Joined: 01 Dec 2014
Posts: 2
PostPosted: Tue Oct 20, 2015 10:11 pm    Post subject: different model Reply with quote
Hi,

as well as being a different model it sounds like a different problem as well. Possibly fuse related but on your pics I can't see anything with the same naming conventions as on the UDM3 (where the fuses seem to all begin with PR)

Sorry I can't be of help, I'm no electronics whizz and I just followed fatz2000's excellent post to the letter.

Hope you get a fix.

fredleon
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guestbonsaibuddy
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PostPosted: Wed Jan 04, 2017 3:16 am    Post subject: ud-m3 reapir Reply with quote
i have done the same repair to my ud-m3 as in listings. works perfect. no need to drill holes for wires as is gap just above the circuit board to the side then used pin nose pliers to grab the wires.
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icybee



Joined: 07 May 2017
Posts: 2
Location: Wokingham
PostPosted: Sun May 07, 2017 4:56 pm    Post subject: Denon udm3 Reply with quote
Message for newcoppiceman

Hi found a post on the forum re cd tray failure - I have my daughters unit which has failed - I suspected the grandkids had stuffed something in and took cover off but nothing obvious - I am not very technically capable - would you be able to look at unit and see if it's repairable - will pay of course - I live in wokingham and daughter is in Epsom so we pass by Woking regularly - especially when the M3 is shut!! Hope you can help - cheers - Ian
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icybee



Joined: 07 May 2017
Posts: 2
Location: Wokingham
PostPosted: Sun May 07, 2017 4:58 pm    Post subject: Denon udm3 Reply with quote
Message for newcoppiceman

Hi found a post on the forum re cd tray failure - I have my daughters unit which has failed - I suspected the grandkids had stuffed something in and took cover off but nothing obvious - I am not very technically capable - would you be able to look at unit and see if it's repairable - will pay of course - I live in wokingham and daughter is in Epsom so we pass by Woking regularly - especially when the M3 is shut!! Hope you can help - cheers - Ian
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rothana



Joined: 09 Jul 2017
Posts: 3
PostPosted: Sun Jul 09, 2017 12:39 am    Post subject: Reply with quote
DENON UMD-30. A very clean and smooth sounding unit. The design is classic and display is adequately bright. If you're limited for space and budget, this is the ...

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TONLOVE69



Joined: 01 Dec 2017
Posts: 7
PostPosted: Fri Dec 15, 2017 9:19 am    Post subject: Reply with quote
Of course, the tray is not out, there is no motor running, every other function seems OK. If the CD is in the drive, it will not recognize it.




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