istari_knight
05-08-2013, 19:13
This is an extremely common fault with all of these little Denons, when turning the volume control it will jump from 0 to 30 & everything inbetween rendering the unit unusable without the remote control. Unfortunately I've found quite a lot of people selling these on eBay would rather bin them than let someone else have a "cheap fix"... Human nature for 'ya ! :doh:
I have decided to document the "repair" procedure for anyone wanting to fix theirs in the hope it might save a few. If you follow the directions correctly I can 99% guarantee the fault will be fixed [I've now done 10+ of these without fail.] This will work for the models: UD-M30, UD-M31, RC-DM33 & RC-DM35 and probably many others I haven't worked on.
All of the usual safety rules apply: If you don't understand it probably best not to attempt it, never work on live electronics, anything you do is entirely at your own risk... If you go at it with a hammer you'll end up with a boat anchor etc etc...
The tools you'll need are: Philips screwdriver, small flat-head screwdriver, pliers, isopropyl alcohol, switch cleaner & cotton buds.
Firstly you need to remove the outer casework screws, there is one large silver one on each side & five small black ones on the rear. Once unscrewed you can get your fingers under each side & pull away from the unit, at this point the outer casework will simply lift off.
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01474_zps363fa569.jpg
Once the outer casework is off you'll be presented with this... Always a good opportunity to do some dusting with a paintbrush !
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01476_zps084b7587.jpg
Now you need to remove the volume control [it pulls off without much force] which will reveal the potentiometer shaft with threaded collar, just gently unscrew and remove the nut & washer.
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01477_zpse120a0ba.jpg
Now flip the unit over & remove the 4 black screws along the front edge.
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01478_zps43bfab06.jpg
There is a little plastic retaining clip each side of the fascia that holds the front fascia on, pulling the fascia whilst pushing on the retainers with your index fingertips will cause the whole front fascia to [literally!] pop off... Be as gentle as possible here as there is a ribbon cable with very little play in it. Once the fascia is separated from the main body lay it flat & remove the 9 screws.
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01479_zps5d9a003e.jpg
You should now be able to pull the PCB from the fascia & gently remove the ribbon cable, you may have to wiggle the PCB to loosen it [quite a tight fit.]
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01480_zpsfc727038.jpg
Now we can see the offending component, the "rotary encoder." Its held together with 4 retaining clips that need to be prised away using a small flat-head screwdriver... Just bend them enough to free the encoder, too much & they will snap off.
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01481_zpsda739a01.jpg
The internals...
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01485_zps30bffe77.jpg
Using some isopropyl alcohol on a cotton bud give of all the internal parts a good clean *be very careful not to bend those little legs* ... Now give both parts a squirt of switch cleaner [I use Servisol but any decent one will do.] Place them back together & bend those retainers back into position nice & tight. The control should now feel smooth to operate if it "clicks" or feels jumpy its not aligned correctly or the legs are bent.
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01488_zps7651b476.jpg
Now its just a case of repeating the disassembly in reverse order, the only hard part being that ribbon cable but I find placing the unit on its side helps giving a little extra room.
Thats it ! Your volume control is now working as it should :yay:
If your rotary encoder is physically damaged or you just want new they can be purchased from here: http://www.chsinteractive.co.uk/electrical-components/misc/udm30-control-volume-denon.htm?utm_source=froogle&utm_medium=ppc&utm_term=90673&utm_campaign=froogle Next time I have to change a laser on one of these I'll add another thread in the same vein as its an equally common fault that's super easy to fix when you know how :)
I have decided to document the "repair" procedure for anyone wanting to fix theirs in the hope it might save a few. If you follow the directions correctly I can 99% guarantee the fault will be fixed [I've now done 10+ of these without fail.] This will work for the models: UD-M30, UD-M31, RC-DM33 & RC-DM35 and probably many others I haven't worked on.
All of the usual safety rules apply: If you don't understand it probably best not to attempt it, never work on live electronics, anything you do is entirely at your own risk... If you go at it with a hammer you'll end up with a boat anchor etc etc...
The tools you'll need are: Philips screwdriver, small flat-head screwdriver, pliers, isopropyl alcohol, switch cleaner & cotton buds.
Firstly you need to remove the outer casework screws, there is one large silver one on each side & five small black ones on the rear. Once unscrewed you can get your fingers under each side & pull away from the unit, at this point the outer casework will simply lift off.
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01474_zps363fa569.jpg
Once the outer casework is off you'll be presented with this... Always a good opportunity to do some dusting with a paintbrush !
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01476_zps084b7587.jpg
Now you need to remove the volume control [it pulls off without much force] which will reveal the potentiometer shaft with threaded collar, just gently unscrew and remove the nut & washer.
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01477_zpse120a0ba.jpg
Now flip the unit over & remove the 4 black screws along the front edge.
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01478_zps43bfab06.jpg
There is a little plastic retaining clip each side of the fascia that holds the front fascia on, pulling the fascia whilst pushing on the retainers with your index fingertips will cause the whole front fascia to [literally!] pop off... Be as gentle as possible here as there is a ribbon cable with very little play in it. Once the fascia is separated from the main body lay it flat & remove the 9 screws.
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01479_zps5d9a003e.jpg
You should now be able to pull the PCB from the fascia & gently remove the ribbon cable, you may have to wiggle the PCB to loosen it [quite a tight fit.]
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01480_zpsfc727038.jpg
Now we can see the offending component, the "rotary encoder." Its held together with 4 retaining clips that need to be prised away using a small flat-head screwdriver... Just bend them enough to free the encoder, too much & they will snap off.
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01481_zpsda739a01.jpg
The internals...
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01485_zps30bffe77.jpg
Using some isopropyl alcohol on a cotton bud give of all the internal parts a good clean *be very careful not to bend those little legs* ... Now give both parts a squirt of switch cleaner [I use Servisol but any decent one will do.] Place them back together & bend those retainers back into position nice & tight. The control should now feel smooth to operate if it "clicks" or feels jumpy its not aligned correctly or the legs are bent.
http://i26.photobucket.com/albums/c129/istari_knight9/DSC01488_zps7651b476.jpg
Now its just a case of repeating the disassembly in reverse order, the only hard part being that ribbon cable but I find placing the unit on its side helps giving a little extra room.
Thats it ! Your volume control is now working as it should :yay:
If your rotary encoder is physically damaged or you just want new they can be purchased from here: http://www.chsinteractive.co.uk/electrical-components/misc/udm30-control-volume-denon.htm?utm_source=froogle&utm_medium=ppc&utm_term=90673&utm_campaign=froogle Next time I have to change a laser on one of these I'll add another thread in the same vein as its an equally common fault that's super easy to fix when you know how :)