DVD / CD player topology - UK Vintage Radio Repair and Restoration Discussion Forum

John_BS · 10th Oct 2021, 7:51 pm

Does anyone have architectural knowledge of the operation of DVD players which can also play audio CD's? I have a Naim AV receiver which will play DVD's, but not CD's, which seems a bit odd. When I had the thing apart, I think I saw two miniscule ceramic pre-sets on the side of the optics, but they really were miniscule. The player is a DLR 200
John

Red to black · 10th Oct 2021, 8:06 pm

Yes, the optical block (pick up) has two Laser diodes inside it, one for each disk type, it is not unusual for one to fail, most usually I found players would play CDs and not DVDs though it is possible for it to fail as yours has.

John_BS · 10th Oct 2021, 9:21 pm

Many thanks for that information: I wonder if a tweak of the diode current might restore the CD section. Problem is I don't know which is which (if the presets are actually presets!).

10th Oct 2021, 7:51 pm	#1
John_BS Octode Join Date: Dec 2008 Location: Wincanton, Somerset, UK. Posts: 1,780	DVD / CD player topology Does anyone have architectural knowledge of the operation of DVD players which can also play audio CD's? I have a Naim AV receiver which will play DVD's, but not CD's, which seems a bit odd. When I had the thing apart, I think I saw two miniscule ceramic pre-sets on the side of the optics, but they really were miniscule. The player is a DLR 200 John

10th Oct 2021, 8:06 pm	#2
Red to black Nonode Join Date: Mar 2010 Location: Sunderland, Tyne and Wear, UK. Posts: 2,474	Re: DVD / CD player topology Yes, the optical block (pick up) has two Laser diodes inside it, one for each disk type, it is not unusual for one to fail, most usually I found players would play CDs and not DVDs though it is possible for it to fail as yours has. __________________ I don't suffer from Insanity. I enjoy every minute of it.

10th Oct 2021, 9:21 pm	#3
John_BS Octode Join Date: Dec 2008 Location: Wincanton, Somerset, UK. Posts: 1,780	Re: DVD / CD player topology Many thanks for that information: I wonder if a tweak of the diode current might restore the CD section. Problem is I don't know which is which (if the presets are actually presets!).