MIDI Time Piece - question
WeAreAs1 at aol.com
WeAreAs1 at aol.com
Tue Feb 2 11:35:22 CET 1999
Hello DIY'ers -
I have acquired a MOTU MIDI Time Piece that has a small problem in the power
input section. There is a resistor which is in series with the DC input jack.
This resistor has burned out (completely open), and it's not possible to tell
what the value of the resistor was (it's kind of charred). I'm guessing that
the former owner tried powering it up with the wrong polarity power supply
(although he wouldn't admit it...). The unit has a 1N4002 diode across the
power input and ground (with the anode going to ground). This diode protects
the unit from inadvertent reverse-polarity supplies, and the resistor is
probably there to act as kind of a fuse, in the event that someone plugs in a
backwards supply. Obviously, the resistor has done its job, and valiantly
given its life in service. I'm fairly well convinced that replacing the
resistor is all I will need do to bring the MTP back to life (I've seen this
before in various other pieces - it's usually the diode or a similar
resistor/fuse).
I'm hoping that someone on the list might have a MIDI Time Piece and be
willing to look inside to find the value of the resistor for me. It's in the
corner of the board that is closest to the DC input jack and the two 1/4"
SMPTE jacks. It's labeled "R0", and judging by what's left of this one, it's
probably 2.2 ohms or maybe 22 ohms. It's located right next to the DC input
jack, and there are no other resistors in this area. Can anyone help? This
is exactly the kind of question that is next to impossible to get answered by
MOTU's, um, "product support" department. Proprietary "stealth resistor"
technology, you know. Wouldn't want it falling into the wrong hands.
Please let me know if you can help me on this.
Thanks,
Michael Bacich
P.S. - It's an original MIDI Time Piece, not a MIDI Time Piece II.
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