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Just one question. Why would you want to downgrade your sound by going from digital to analog tape complete with it's own hiss? I assume that you are using the dvd player to play your cd's.
anyways.............since one of your units is digital and one not, get 2 red and white composite audio cables. Use one red & white cable and go from the "output" of the audio of the dvd to the "in" of your tape deck. The other set of cables will go to the "out" of your tapedeck and will go to any tape or cd or aux in the back of your amp. Make sure the device selection button on the amp matches whatever slot you put the cables into on the back of the amp. Start a cd and put a casette in the tapedeck. Push record to see that the sound is coming through.
We still do not know what model you are working on to help you with a Service Manual. Again jumping to conclusions is not a good thing to do nor are you likely to find that microprocessor chip. The fact is that uP in most tape deck do not fail and it is very rare. I suspect you have a bad solder joint or a regulator problem. The last Denon unit a guy brought me had a control section out due to a shorted 6.3 V electrolytic. I don't know where these low voltage caps come from but anything below 16 V to me is and I suspect are drop outs from 16 V manufacture lines. Change them out for 16V minimum. I have had a lot of decks fail totally due to shorted 10 V Electrolytics. Manual wise- Try Hi Fi Engine or Owners-manuals.com or if you want paper try stereomanuals.com
There should be a DUB button. After you push the DUB button, you will have another button that will allow you to select Dub form 1-2 or 2-1. If not there will only be one deck that will play while the other records and plays. Put the tape to be coppied in the play deck and the blank tape in the record deck push record and it should work.
Is the erasure prevention tab missing from a commercial or previously recorded cassette? It would leave a little (about 1/8" square) hole in the spine edge of the cassette shell. That tab is there to prevent accidental erasure by allowing a small sensor lever to drop in and mechanically disable the recording mechanism. Compare a commercial cassette with a brand new blank one. You can place a piece of adhesive tape on the casette to allow recording, but take care to NOT cover more than the first 1/8" of the opening if it is larger as the recorder also senses tape type by the length of the hole molded into the cassette.
Word to the wise - don't scrimp on the tape if the recording matters to you. Spend a bit extra for better tapes. Store the tapes 'played', avoid fast forwarding and rewinding unless you'll be playing them through to wrap the tape uniformly before storing it INSIDE its tape box. Read the other warnings that come with the media. No heat, moisture, dust, blah-blah.
Oxide deposits on heads can restrict audio transfer to tape. You may need to do a deep cleaning of record head. Depending on how much deposits are on heads may need no more than alchohol and Q-tip. Be sure to clean erase head and drive roller. Afterwards, try recording, then use headphones in jack on recorder to check for recording on both channels. If this works, problem is not in rest of equipment set up. If you still need help, email me