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The RCA outputs sockets on the 122 connect to either tape 1 or tape 2 "PLAY". on the Nad.
The Line In Jacks on the 122 connect to the record of tape 1 or tape 2 rec of the Nad.
If you connect it to tape 1 connect both to that.
To listen to the deck you select either tape 1 or 2 depending which you have connected it too.
With this kind of mechanism you need to open the deck up and assist the cam wheel by hand to get the eject block and heads to go down to the stop mode. This is the only way to get a tape out without destruction to both tape and machine. I have done it a few times. If you can not do it yourself, I am in the Chicago area as Skywave Tape Deck Repair. I can get the tape out.
There should be a button or switch that will select the recording deck and the dubbing deck. You put a blank tape into the recording deck and the pre-recorded one into the play deck. Pressing the record button on the dubbing deck, on some models should start the play deck running. If not press play on that deck.
Just connect the deck via tape 1 the out of the deck going to the in of the amp. While the out of the amp goes to the in of the deck.
The tape deck itself will automatically choose the player that plays the cassette. One will play the other will be on pause (if you press both play buttons) till the tape stops then the other will play. For recording from tape to tape one deck will be the copy and the other the copier. There should be a dubbing button which you press to record tape to tape. Some models have a high speed dub also. For recording from the amp unless both decks have record buttons you will only be able to record with one deck. Make certain the dub button is not set.
That would be me at Skywave Tape Deck Repair- maybe I have contacted you already through Thumbtack. I can not say more here but if you search for tape deck repair in Chicago you no doubt will come across me sooner or later. The only other person you would be qualified would be Russ Bachmann at New Jersey Factory service. We both worked at Teac factory service facilities and rose to high ranks at those facilities.
The Bias control is used during recording. If you turn down the bias,
you will get more highs, but the distortion will increase, and then
start to increase dramatically if you back off the bias more.
As far as playing tapes from different decks goes.......
1..Does the tape that you recorded on your deck sound OK on your deck ?
2..Does the tape that you recorded on your deck sound OK on other decks ?
If 1 and 2 are true, then your deck is OK.
If the tapes recorded on a specific deck sound bar on yours, but 1 and 2 are true, then the other deck is faulty.
When a deck leaves the factory, the head is aligned to a " standard "
tape. By standard tape I mean a very special tape recorded in such a
way, that a tech can tell if the head is out of align and "tweek " the
physical alignment of the tape head..
All decks are aligned just a little differently, but fairly close to each other.
first do the mechanicals....is the head of your deck spotlessly clean ?.
Use 99% pure isopropanol alcohol and a cotton swab. Never use anything
metal to clean the tape head. If you scratch the head, its toast.
If your deck is clean, plays its own recordings well, and those
recordings play well on other decks, then your deck is not the problem.
the tascam 414 is a 4 track recording studio which uses standard cassette tapes- meaning they only play in one direction, because the tape is full. The 414 records at double speed so that recording fidelity is increased. When you have made a recording you want to mix you then dub your recording though the outputs into another standard tape recorder or whatever you have available, be it a cd recorder or your PC. So, when you listened to your recording on a standard tape player, you were not only hearing it at half speed but you were only listening to 2 of the 4 tracks. The other tracks would only be heard if you flipped the tape over, and they would be heard running backward. I would have though the 414 had a swich to allow it to also record at standard speed to but I guest it does not.
try firmly banging the cassette onto a table top(with reels flat) a few times, then ff right through and rew a couple of times. this will layer the tape more evenly and hopefully allow the mechanism to play it. the takeup reel or autostop mechanism may be failing if the deck does not have enough torque to carry the tape and may require belts replaced or dried grease removed in the transport.
There is a tape tension sensor which, it appears, isn't working. Check to see if the linkage to this sensor may have been misaligned while you were replacing the belts. Also check to see that the sensor isn't binding or sticking.