VID / REP: Teac X-2000R tension arms

Although my Teac X-2000R was almost mint, from the first moment the tension arms fluctuated when it was in play mode, both forward or reverse.

I swapped both tension arms guide rollers but the problem persisted.

I opened the deck trying to figure out which was the problem. The auto-tension system is basically the same as the one found in the Grundig TS-1000. Each tension arm has a small plate attached in the inside and passes near a photodetector so that when the tension arm is in the lower position, the motor power goes up, and when the arm goes to a higher position, the tension applied to the motor goes down.

Here is a video shot from the inside of the machine:

I tried to adjust the position of the photodetectors and even the trimmers that adjust the tension, but no luck, the problem still happening.

The tension arm axis is a screw that has springs. I realized that when I manipulated the screw, the height position of the tension arm varied. I adjusted this screw with the machine in play mode with a tape threaded so that I can watch the results in real time. I minimal adjustement was needed to watch the tension arm stops its oscillation.

In appearance, this was a rare failure, because most times whis happen is caused by old motors and/or poor lubricated rollers and arms, but in this case, both rollers are in perfect shape and the motors too.

Here is another video with the final result after the adjustement: