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  1. #31
    Senior Member
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    Jan 2013
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    426
    Just curious... What's the make and model number of that PSU?

  2. #32
    Member
    Join Date
    Nov 2008
    Location
    Switzerland
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    37
    Quote Originally Posted by Fizbin View Post
    Just curious... What's the make and model number of that PSU?
    Mean Well PS-15-5, 2.8A@5V; I got it from Distrelec. As the terminals are different, I got a couple of crimp contacts, SVH-21T-P1.1, which I soldered onto the wire ends.

  3. #33
    Senior Member
    Join Date
    May 2015
    Location
    Grosse Pointe Woods, MI
    Posts
    778
    Quote Originally Posted by arkadi58 View Post
    I got a comparable PS from a local source; the size is different, so the result is not that pretty, but an immediate success.
    Attachment 22124
    Here is a picture of the old PS; there are some signs of heat damage, right opposite the voltage regulator.
    Attachment 22125
    Glad it was the fix. The symptoms were classic.

    Point of interest is that in switchmode power supplies like this, there is usually no single voltage regulator. Most of the active parts are inside a feedback loop that couples back to the power line side with an opto-isolator.

    The slippery slope to failure usually starts with a slowly partially failing electrolytic cap or transistor. its internal resistance increases a little at a time. The power supply may still measure OK with no load, but in use, some voltage output is well below spec.

    For example, the spec for 5 volts is on the order of 4.75 volts minimum. So the 3-ish volts that was observed was solidly in failure territory. Given the low costs and possibility of multiple degraded components, a total replace makes a ton of sense.

  4. #34
    Junior Member
    Join Date
    Jul 2019
    Posts
    1

    Thank You So Much!

    I don't know if anyone is still looking at this thread but I just want to thank mkbrucetx and all the others who posted about this issue. You can add me to the list of success stories. This was such a easy fix and I am very happy to have my Transporter back in action.
    For those who wish to know, the part was ordered from eBay and a company called Blue Sky Components Limited. Its description was: PowerPax UK SW3376 Mini Open Frame PSU 5VDC 2.3A It came from the UK just like the one mkbrucetx ordered and was about the
    same price. Anyway, thanks again everyone for posting about this. It really made the fix very easy. Hopefully the part will still be available if my other Transporter decides it wants to retire.


    Quote Originally Posted by mkbrucetx View Post
    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.

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