[iyonix-support] Re: PSU below spec?
- From: David Mc Dowell <david.mcdowell@xxxxxxxxxxxx>
- To: iyonix-support@xxxxxxxxxxxxx
- Date: Sun, 18 Feb 2007 10:53:01 GMT
In message <8b9a01b74e.boase@xxxxxxxxxxxxxxxxx>
Bernard Boase <B.Boase@xxxxxxx> wrote:
> The power supply (Herolchi HEC-250LR-AT) in my Iyonix (serial
> IYO1100963) is suddenly dropping its +12V supply to between 11.53 and
> 11.63V, with the result that the hard drives stop being able to read.
>
> Sometimes it recovers, e.g.after I gave the PSU a thorough cool-off
> and dust-out, but more often than not the voltage drop now makes the
> machine unusable.
>
> Should I just replace the PSU, or might there be some other cause
> draining the +12V supply?
>
> Grateful any ideas.
>
I would just replace the HEC with Q-Tec from Iyonix Ltd. 58GBP inc P+P
save hassle fully guaranteed to be correct spec!
I have recently done this - my symptoms included erratic harddisc perfomance
failing to boot properly, lots of errors requiring copious use of DiscKnight-
also Error 26's, (IDE cable CRC errors) and data lost errors, (as others have
reported) these were in the main 'spurious errors' caused by a failing
power supply. I replaced my 120GB Maxtor fortunately not throwing it away as
it was still perfect - now kept as second backup drive. I also have spare
UDMA round IDE cables - not real Error 26's!
More usually its low 5 volt (symptom of noisy/dirty waveform due to dried out
capacitors) gives the most problems. I had a range of things; losing
Ethernet/internet, intermittantly. was most irritating. When after speaking
to JWB and measuring my HEC with borrowed DVM - it was just on borderline of
5.06 + - .02V at 5.04 on this three and half year old Iyonix.
Now everything is back to totally reliable normal.
Regards, David.
--
David Mc Dowell: RISC OS 4 Authorised Installer
Acorn User since discovering the 'Atom' in 1979
Member: Cambridge RISCOS User Group (CAMRUG)
Cambridgeshire, United Kingdom.
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