ukclique > comp.* > comp.sys.laptops

Graham J (29.05.2016, 17:40)
This is for a Port Designs Ergo Station II with 4 Port USB Hub, see:



The PSU has been lost.

I can't find any specification so I don't know the voltage, whether ac
or dc, pin polarity, etc. - nothing. If somebody has one of these and
can tell me what is written on the PSU I can improvise ...

TIA
Theo Markettos (29.05.2016, 20:26)
In uk.comp.sys.mac Graham J <graham> wrote:
> This is for a Port Designs Ergo Station II with 4 Port USB Hub, see:
>
> The PSU has been lost.
> I can't find any specification so I don't know the voltage, whether ac
> or dc, pin polarity, etc. - nothing. If somebody has one of these and
> can tell me what is written on the PSU I can improvise ...


Since it's just a USB hub, it's likely to be 5V DC.

A simple check on polarity would be to check for continuity between the
inlet and the shell of a USB plug. My guess would be it's a barrel
connector with centre positive/shell negative. Probably 2.1mm or 2.5mm
barrel (they're annoyingly hard to tell apart).

Since it's 4 port, get one with at least 4A and that should be enough for
most USB devices.

Theo
Graham J (29.05.2016, 23:41)
Theo Markettos wrote:
> In uk.comp.sys.mac Graham J <graham> wrote:
> Since it's just a USB hub, it's likely to be 5V DC.
> A simple check on polarity would be to check for continuity between the
> inlet and the shell of a USB plug. My guess would be it's a barrel
> connector with centre positive/shell negative. Probably 2.1mm or 2.5mm
> barrel (they're annoyingly hard to tell apart).
> Since it's 4 port, get one with at least 4A and that should be enough for
> most USB devices.


I took it apart. The pcb has what looks like a regulator chip and a big
diode so it probably wants about 9v dc and might tolerate polarity
reversal. There's also a transistor and a chip with about ten leads per
side. So a bit more reverse engineering and I will get there ...
Dr J R Stockton (30.05.2016, 22:03)
In demon.tech.pc message <nifnm7$s21$1>, Sun, 29 May 2016
22:41:27, Graham J <graham> posted:

>I took it apart. The pcb has what looks like a regulator chip and a
>big diode so it probably wants about 9v dc and might tolerate polarity
>reversal. There's also a transistor and a chip with about ten leads
>per side. So a bit more reverse engineering and I will get there ...


The "transistor" could be a three-pin voltage regulator. I suggest that
you give us (and Google-search) the part numbers of anything that looks
like a semiconductor, but perhaps not the "date" indicator (I cannot
recall what those looked like, and have not seen any with post-1999
notation).
Graham J (01.06.2016, 16:27)
Graham J wrote:
> Theo Markettos wrote:
> I took it apart. The pcb has what looks like a regulator chip and a big
> diode so it probably wants about 9v dc and might tolerate polarity
> reversal. There's also a transistor and a chip with about ten leads per
> side. So a bit more reverse engineering and I will get there ...


Found one which gives 9v at 850mA and has the correct barrel plug - so
using that.

Thanks for all the help.
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