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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.
You need a set of RCA AV dubbing cables (available at fine electronics
stores everywhere), and a couple VCRs. Plug the cables into the "A/V
Out" jacks on the back of the VCR that will be playing, and into the
"A/V In" jacks on the VCR that will record.
Also on the recording
VCR, use a regular coaxial cable to attach it to a television.
set the TV to 3, fire up the VCR's, and set the recording VCR's TV/VCR
toggle to VCR. Also on the one that is recording, set the channel to
"INPUT" or "AUX" or something like that. (You're telling it to record
what it sees coming from the jacks you plugged the cables into.) Then
hit Play on the other machine. You should be able to see your tape
playing back. If you do, you have followed these directions correctly,
and you're ready to make your dub.
HINT: The first few feet of
tape are often prone to dropout and generally sucking. Record a minute
of black before making your dub. Mark this on the tape or tell them when
you turn it in. They will be impressed.
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.
If there is a switch (either a mechanical switch or a relay) that changes the recording mode (something like normal/dub or record/dub), it might have oxydized contacts and this may be the cause of the problem. Cleaning the contacts inside the switch/relay or replacing the switch/relay will probably solve this.
You may want to check the switch prior to removing it. You can do it with a continuity tester (possibly with the kind that gives a sound signal when the continuity is good).
Otherwise, if the switch can be disassembled in a simple way, see if the contacts inside the switch are brownish/oxydized, if so, you need to clean them, but you also need to clean the clips that connect the contacts. Some fine sandpaper will do the trick, but be careful when you disassemble and reassemble the switch, some parts can easily get damaged.
As far as I know, you need to press Record button to record from external source. If you press Dub, it will start Dubbing from Tape-A to Tape-B. You might be need to press Record and later press Pause or Play to start recording.