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General Discussion / Re: Nagra T - Tape tension stability issue.
« on: July 08, 2013, 01:03:43 PM »
Hi Dan.
Thank you for your answer.
I red carefully this topic 2005.15, I'm not sure to face the same problem.
My machine mostly work correctly, but a particular type of tape seems to trigger the issue.
It looks like a friction problem of the tape oxide onto the tension sensor.
This friction creates an audible noise, and induces a kind of modulation also on the output signal.
I would like to check if this oscillation exist electrically on the tension control loop, and have a general check on test points in this area.
For some reasons it could be that this loop is a bit susceptible, and this friction could be enough to push the tension regulation to oscillate.
It's always difficult in a close loop system to discover the root cause.
That's why I'm searching for the Service Manual.
Thanks again for your time.
Ren?.
Thank you for your answer.
I red carefully this topic 2005.15, I'm not sure to face the same problem.
My machine mostly work correctly, but a particular type of tape seems to trigger the issue.
It looks like a friction problem of the tape oxide onto the tension sensor.
This friction creates an audible noise, and induces a kind of modulation also on the output signal.
I would like to check if this oscillation exist electrically on the tension control loop, and have a general check on test points in this area.
For some reasons it could be that this loop is a bit susceptible, and this friction could be enough to push the tension regulation to oscillate.
It's always difficult in a close loop system to discover the root cause.
That's why I'm searching for the Service Manual.
Thanks again for your time.
Ren?.