I own a Denon UDRA-f10 reciever (and UCD-f10 cd-player). The sound is very good. But I can not save the radio preset.
I tune in to a radiostation, press the Memory button, select a preset number, press Memory again. But when I select the preset number the old frequency (from the previous user) is used. The Memory button doesn't overwrite the old frequency.
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Protect mode can not be "reset". This mode means that a problem was detected in the final amp stage and the unit has been shutdown to prevent further damage. The most common cause of this is failed output transistors. Plan on a parts cost in the $20-$20 range for this repair.
Blingking Light or Protect usually means that there is DC appearing in output stage and is protecting Connected Speakers. It can be faulty Output Stage (Bad ICs/Transistors/Resistors/Capacitors) or Faulty Power Supply.
Working on These types of Problem is not user friendly at all.
This is an older way that makers of CD changers used to get CDs into cars that didn't have them. This is what they tried to get people to by them. I was never a fan of this system as the sound quality was never better than listening to FM radio. There is a unit in the car, usually under the dash behind the glove box, that the CD changer is plugged into. This unit has the FM antenna from the car plugged into it, and then a cable that is the same as that coming from the antenna going from the unit under the dash plugged into the FM antenna jack of the radio in the dash. All this unit does is take the digital, high quality sound from the CDs, transmit it on an FM frequency (usually low on the FM band 80s, 90s or low 100s) and then you tune the radio into that FM frequency to get the sound form the CDs. Problem is, the sound quality was only as good as FM radio. A pretty poor way of getting CDs into cars. But they sold millions of these things. If it isn't working, the wiring may have come loose, the fuse to the unit under the dash might be blown, or something is disconnected. if you go all through the FM dial, 0.1 at a time and don't hear it, it is time to get under the dash near the glove box and poke around. Good luck. If it were me, I would take all this gear out and put a new CD/MP3 player where the factory radio currently sits.
Sounds like an internal prob within the reciever, since recievers have radio tuners in em, maybe a prob in the input switching in it.
I assume you are running unbalanced rca cables out of the dvd player into the reciever as it probably doesn't have balanced input capability, unbalanced lines are susceptible to R.F.I. ( radio frequency interference ) but I doubt if that's the problem here unless maybe you are running very long cable lengths from the dvd player to the reciever.
Try using a different input and see if the problems still there, can use any input other than phonograph really as they are all line level inputs.
sounds like the radio cable ain't full connected or maybe just not connected to right place. sometimes one wire gone wrong messes up everything. did you get a install kit for your cd player might be a good idea