I use my Denon DVD-3930 as my universal audio player. The problem is that is just does not read / load regular audio CD's/SACD's or randomly does (sometimes it does/does not, in case of the same CD!). I tried a DVD cleaning disc, but the same problem continues to occur. Shall I manually clean the lenses? I am not a technician/DVD expert.
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there is the possibility of damage to the optic lens of the DVD is already weakened or damaged. so it can not load the disc. you have to replace them with new ones according to the type of DVD optical lens.
By this time I figure most peoples warranties are expired. So give this a try:
1 Open the case. 2 Turn the unit on and load a disk. 3 On top of the disk transport, you will see a black disk trying to spin as it reads the disk. You might notice that it is a bit quite as the display goes to 00H00M00S. It should be fast and a bit noisy. 4 Try loading a disk again, except this time, try to help that little black disk spin. It might take a couple of attempts, but I was able to get my 2910 working again.
The last year I've had to do this 2-3 times. But it works. From what little I have read, it may just be an issue with lubricating the right part with the right oil. I've narrowed my choices to PTFE 3n1 oil, Lithium oil, or silicone oil.