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  1. #1
    Junior Member
    Join Date
    Jun 2016
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    12

    Fix for spuriously rebooting Transporter

    For a couple of months, my Transporter would spuriously reboot itself as if it had lost power completely - relays clicking, logo scrolling, etc.

    Not finding anything directly relevant through Google searches other than a vague reference to the DC power supply being a cheap Chinese switcher, I opened the cover and measured the PSU output - 5.1 V unloaded, exactly what one might expect. However, plug in the front panel, and the voltage dropped to 4.6 and wandered around between there and 4.8-4.9 - the DC power supply was obviously hosed.

    Searching around some more, I found a UK company that sells a rebranded version of the exact same board from Unifive. I'll post a link in a follow-on message (since this is my first post to this forum, I can't post it here)

    Confident in the fix, I ordered two ($8 each, but $31 shipping from the UK to US). A few days later, the new supplies arrived at my door. Put one in and checked voltage - 5.1V unloaded and 5.1V with the front panel plugged in.

    The Transporter is back in the rack and I'm hoping to not hear the dreaded clicking of a reboot.

    Hopefully this will help someone with a similar problem or a completely dead front panel - check the DC supply between the front panel and the main board in the back, but be careful. The back connector is 110VAC when plugged in. The front connector is 4 pins but only the outer two are used.

  2. #2
    Junior Member
    Join Date
    Jun 2016
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    12
    Link to replacement power supply:

    https://www.rapidonline.com/powerpax...c-2-3a-85-2251

  3. #3
    Senior Member
    Join Date
    May 2008
    Location
    United States
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    11,076
    Thanks for posting. I'm sure this will help some Transporter owner in the future!

    EDIT: and what do you know....later in this tread that future transporter owner turned out to be me!
    Last edited by garym; 2016-09-15 at 17:35.
    Home: VortexBox 4TB (2.4) > LMS 7.9.1 > Transporter, Touch, Boom, Radio (all ethernet)
    Cottage: VBA 3TB (2.4) > LMS 7.9.1 > Touch > Benchmark DAC I, Boom, Radio w/Battery (all ethernet except Radio)
    Office: Win8(64) > LMS 7.9.1 > Squeezelite
    Spares: Transporter, Touch(3), Radio(3), Boom, SB3, CONTROLLER
    Controllers: iPhone6 & iPadAir2 (iPeng & Squeezepad), CONTROLLER, or SqueezePlay 7.8 on Win10(64) laptop
    Files: ripping: dbpoweramp > FLAC; post-rip: mp3tag, PerfectTunes; Streaming: Spotify

  4. #4
    Senior Member
    Join Date
    Jan 2013
    Posts
    357
    Thanks for the heads up. I have two myself, and I don't even have a Transporter...yet.

    Any chance I can have your old PSU? (I'll pay you to ship it to me) I'd love to take a look at it with my magnifier. (If "yes", I'll PM you)

  5. #5
    Junior Member
    Join Date
    Jun 2016
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    12
    Quote Originally Posted by Fizbin View Post
    Thanks for the heads up. I have two myself, and I don't even have a Transporter...yet.

    Any chance I can have your old PSU? (I'll pay you to ship it to me) I'd love to take a look at it with my magnifier. (If "yes", I'll PM you)
    Sure - PM me your info and we can arrange something.

  6. #6
    Senior Member
    Join Date
    Jan 2013
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    357
    Thanks! You'll have to turn your private message option ON. Right now its disabled.

  7. #7
    Senior Member
    Join Date
    Apr 2013
    Location
    UK
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    1,007
    It is quite normal for an unregulated power supply to drop output voltage quite significantly when it's put under load but I would have expected a regulated supply in that location. It is a cheap fix, however.
    Last edited by drmatt; 2016-07-01 at 01:46.
    --
    Hardware: 3x Touch, 1x Radio, 2x Receivers, 1 HP Microserver NAS with Debian+LMS 7.9.0
    Music: ~1300 CDs, as 450 GB of 16/44k FLACs. No less than 3x 24/44k albums..

  8. #8
    Junior Member
    Join Date
    Jun 2016
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    12
    Quote Originally Posted by drmatt View Post
    It is quite normal for an unregulated power supply to drop output voltage quite significantly when it's put under load but I would have expected a regulated supply in that location. It is a cheap fix, however.
    The 5VDC supply in the Transporter is load regulated to +/-5% and line regulated to +/-1% according to the manufacturer specs.

  9. #9
    Senior Member
    Join Date
    Jan 2013
    Posts
    357
    mkbrucetx: How is your Transporter doing since you replaced the PSU?

  10. #10
    Junior Member
    Join Date
    Jun 2016
    Posts
    12
    Quote Originally Posted by Fizbin View Post
    mkbrucetx: How is your Transporter doing since you replaced the PSU?
    Happy as a clam - no reboots or other weird behavior.

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