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Re: TEAC X1000R Stereo Tape Desk (reel to reel)
That is a over simplified version of the truth. The X1000R is a very complicated deck employing a servo tension system of the reel motors- these often times get off reference and need adjustments. If the Capstan belt is to be replaced it is best done by a Technician- why is this? Because the change of any capstan related part requires the calibration of the speed adjustments on the capstan servo board. In other words- the belt just does not plug in. The Flywheels should be pulled out and cleaned and the bearings oiled- Just putting on a belt will not accomplish this. I kind of know these machines as I have been a Teac Technician from the early 80's and have worked at the Factory Service in Arlington Heights IL. I operate Skywave Tape Deck Repair in the Chicago area if you want the deck serviced correctly and with a 6 month warranty.. I repair Teac, Pioneer, Sony, Technics and Studer units all the time. I have been servicing decks for better than 40 years now.
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Logically, if the full tape reel and the empty reel are identical the second must fill at the same rate the other empties and all the tape from the first will fit on the second.
What does happen, however, is at the start the second reel seems to fill much quicker than the first reel is emptying, which is understandable when for any given tape length the second reel will revolve between at least twice as fast as the first reel and probably even faster.
A tape reel that appears to be half full will have much less than half the available tape capacity filled.
Well two things have to happen to make tape move in a cassette deck. One is the Capstan shaft has to rotate and that is usually a belt link to a motor through a pulley. The second thing is you must have take-up torque. If the tape moves but the take-up reel does not pull it onto the take-up reel then you either have a eaten tape or the deck will shut off. in your complaint it could be any of these items- maybe a bad Idler from the reel motor or the capstan belt is old and stretched.
Well, not being there to try some diagnostics, there can be a number of reason that the tape plays backwards at times. One reason is that the tapes are 4 channel discrete tape requiring a 4 track 4 channel deck- this would mean track 2,4 are recorded in the forward direction. A Stereo (2 channel 4 track deck) play tracks 2,4 in the opposite direction. That is why you turn the tape over on some decks. Other possibilities could be tape path skew, that reverse relay is NOT changing the head that "listens: to the tape and that is just the start of what it could be. When a new person starts to use a deck of such age- it can be correct to assume that the deck is not working in some respect. A Tape deck Technician such as myself would know how to determine if the deck was working correct or not and know and have parts to correct it. I worked in the Factory Service in Chicago for Teac and actually have one coming into my shop in the near future. After 40 years of working on these I am still at it. I am sorry there may not be an easy answer to this.
This is a case of a failing reel motor. What happens i sthe brushes become aged and wear down and the motor has what they call a dead spot on the Commutator. The motor will work fine at high speeds as the inertia is working for it but when you use a slow speed as in play mode the motor hits the dead spot and stops. You will need a new reel motor in the most likely case- I can service the deck if you want at Skywave Tape Deck Repair Chicago area. I will most likely put a new motor into the deck.
Without actually seeing your Teac reel deck, i suggest you verify that all fuzes in the deck are good..not blown. Also with a tape correctly installed..ensure that left and right tape tension arms are held under tension/ closed by tape tension, also ensure the capstan shaft is rotating... look in back to ensure the capstan drive motor is running.. if yes, and tape still will not play... problem could be a stuck/failed solenoid, dirty or corroded push buttons, or corrosion on contacts where rear circuit boards/plugs insert into other boards.