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Thread: Tascam MS-16 Transport Not Working....

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    Tascam MS-16 Transport Not Working....

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    Hi all,
    I'm in a bit of a panic because I'm dealing with a deadline and my MS-16 very suddenly stopped moving tape.
    None of the transport buttons are lighting up or functioning. Not even 'Edit'.
    To summarize...
    -the capstan *is* spinning
    -the speed readout lights up
    -the track arming panel lights up and behaves normally
    -the minute/second readout is working (well it's stuck at 0:00 because none of the transport modes work).
    -All the fuses are OK
    Any thoughts? Experience with this issue?
    It seems to be the identical issue posted by this guy: Tascam MS-16 Power Problem (sadly there was no posted followup).
    Last edited by ethyrvalve; 01-12-2016 at 13:29.
    My humble, militantly analogue studio's blog: The Bottle Garden

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    Inside the transport, on the Motor Control PCB, there are 3 heat sink mounted transistors which are susceptible to heat failure from age. They are listed as Q-10,11 & 12. I would replace all three of those and that should fix your dead transport issue. I've read other stories of this specific issue with the MS-16 and ATR-60 transports and that seems to be the most common fix. That board slides out through the rear of the transport casing but requires a fair bit of disassembly to get to so this is not a job for the timid or the inexperienced DIY'er. Page 8-28 of the manual will give you the specific part numbers. Pages 8-26 and 8-27 will show you the board layout and where those parts are located on the pcb.

    Good luck!

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    Thanks so much Gle!
    I wonder if higher rated equivalents exist?
    My humble, militantly analogue studio's blog: The Bottle Garden

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    Quote Originally Posted by ethyrvalve View Post
    Thanks so much Gle!
    I wonder if higher rated equivalents exist?
    No idea but consider this: the ones that were in there lasted 30+ years so there's that.

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    Fair point about the ratings!

    Hmm, the transistor junctions seem to test ok. Could they still be bad but test ok in a multimeter?

    The person on groupdiy told me his issue ended up being the 5v regulator on the PSU pcb (mine is ok; all voltages seem to be ok).

    I'm a bit stumped as to where to look next.
    My humble, militantly analogue studio's blog: The Bottle Garden

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    Have you followed the testing protocols outlined in this video?


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    If the transistors were tested properly and (out of circuit to avoid any false readings), I guess the next thing to look at is to do with the power supply and testing whether or not the motor board is receiving all of the voltages it needs from the power supply. If all that checks out OK then I too am stumped as to where to look after all that is confirmed, beyond looking for visual signs of burnt components such as caps or resistors that show discolorment, (browning).

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    Thank Gle, they tested fine using the diode mode but I just verified again with the method used in the video.
    I just noticed that the IC mounted on the heatsink is another 7815a 15v fixed regulator. I'm thinking this needs further investigation too.
    Last edited by ethyrvalve; 01-13-2016 at 06:29. Reason: typo wrong regulator voltage
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    After having a surprisingly hard time finding an appropriate source voltage, I found the 7815A on the Motor Control board is ok too. I'm truly stumped now.

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    I re-soldered and reassembled the motor control board.
    Another clue: I can now get into dump edit mode by clicking Edit+Play. And once in this mode. Stop will work. And the supply tension arm can be manipulated to vary the supply motor.
    I wonder if there could be something wrong with the takeup tension circuitry? It's weird that all this happened so suddenly in the midst of tracking with no warning...
    My humble, militantly analogue studio's blog: The Bottle Garden

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