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Thread: Tascam 38 transport problem

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    Tascam 38 transport problem

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    Sorry for being pain in the ass but i need to ask you again about my maschine.

    Just take a look at a picture, it looks like pinch roller is putting more pressure on one side of capstan. In result, as you can see, tape is not rolling even and it is rubbing one side of the guide. I had this before, but I thought it was because of old/melted pinch roller. Now I have changed pinch roller along with capstan belt and after turning it on, it seemed ok, so we started doing some alignment/ calibration. Ater a while (1h maybe) we have notieced out of phase signal between two output tracks on a oscilloscope (picture no 2) We were plaing back tone from the test tape. I looked at headstock and notieced the problem went back

    For us it looks like the metal part that is holding pinch roller is not 100% still. It seems to be little bit loose on its mounting. Not very much like maybe 0.5mm. In result capstan and pinch roller is not 100% parallel while prssured. Im not sure you can see it on a picture, but even without pressure it is not parallel, I think.

    What wonders me, is why was it ok for a while, and then went back to previous state.

    Do you have any idea? Im guessing it is not recomended to use maschine in this state?

    Im depressed
    Attached Thumbnails Attached Thumbnails img_1338_zpsa059dbad-jpg   img_1336_zps5fd8addf-jpg   img_1337_zps2436169e-jpg   img_1339_zpsa2e8aa16-jpg  

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    some ideas:

    1) Any misalignment in the headblock (unlikely)
    2) Check that the pinch roller doesn't wobble. Take a close look at it when turning
    3) One possibility is that the pinch roller arm is slightly bent or has play, so you have a pinch roller that engages the capstan not fully flat
    4) Check the tape path carefully to try to find the misalignment.

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    The only thing I'm noticing is that the pinch roller is sitting way too low in the first picture.

    The tape should be travelling midway between the top and bottom of the roller so I'm suspecting that your replacement roller is the wrong one or is perhaps mounted upside down, by accident.

    Cheers!

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    Quote Originally Posted by fgonza2 View Post
    3) One possibility is that the pinch roller arm is slightly bent or has play, so you have a pinch roller that engages the capstan not fully flat
    For me it looks like it. If so, can this be fixed somehow?


    Quote Originally Posted by The Ghost of FM View Post
    The only thing I'm noticing is that the pinch roller is sitting way too low in the first picture.

    The tape should be travelling midway between the top and bottom of the roller so I'm suspecting that your replacement roller is the wrong one or is perhaps mounted upside down, by accident.

    Cheers!
    Yes, I also notieced that, but I think pinch roller is not symetrical, so it can be mounted only one way.

    Thanks

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    does it have any wobble ?

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    I think you might be missing a part (spacer,shim,keeper etc...).

    Gary

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    Quote Originally Posted by sasquatch View Post
    I think you might be missing a part (spacer,shim,keeper etc...).

    Gary
    You mean the part that should go underneath pinch roller to make it sit higher, or something else?

    thanks for all suggestions

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    Do you have the collar bearing that sits on top of the roller on the shaft ?
    As mentioned roller sits mighty low.Maybe upside down?

    Gary

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    Look at the picture, #7 (collar bearing) should come out when you remove the pinch roller. Do you have it ?

    t38-pinch-png

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    Is the tape rubbing on the top of all the guides? I wonder if the alignment problem is the actual spools? The tape looks as if it is high on heads too.

    Alan.

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