[Soekris] [SPAM] Hard power problem with net5501-70

[Przemyslaw Maszenda]

Hi

I have brand new net5501-70 (bought 1,5 week ago) and "Power Supply, 
12V, 2.5A, IEC320-C14 inlet" with 230 inlet from Soekris europe shop and 
have this problem too:
after power off (unplugged 12 V end of power supply or 230V end of 
power-supply), when I power on (re-plug) box doesn't start:
* red diode "Error" brights
* green diode "Power" brights too.
* Yellow diode "Disk" doesn't bright.
* There is no BIOS prompt.

I must repeat unplug / replug few times (usually 1 or 2 times but 
sometimes 3 or more times) to start net5501 and receive BIOS prompt....

"+++ reset" nor "+++ power" over rs-232 console doesn't help. For me 
this is most critical problem with net 5501.

I saw few people had wrote about this problem on this list, but I didn't 
  find solution nor workaround :(.


ymartin wrote:
> 
> We got some hard power problems here with 20 new net5501-70 (serials numbers
> from 173070 to 173089):
> -> 
> When we unplugged the power-supply then re-plug, sometime it doesn't
> restart, without any reason.
> - We are using 12V 1.5A power supply from Globtek and one PCI card plugged
> on the Net5501-70.
> 
> What we do :
> 
> We tried different voltages from 7.5 to 15 Volts without any stable result.
> - With input at 7.5V., there is a small noise probably generated by internal
> converter (aprox. 130mV/300kHz) but I don't think this will affect the board
> (tested on 12V. pins).
> - With input at 12V. noise is insignificant.
> - Hard power problems "looks like" more stable with low voltage (7.5V)
> 
> Is it a known problem? What can we do to resolve this issue?
> 
> 
> -----
> Regards,
> 
> Yves MARTIN
> ymartin at PointCA.com
> PointCA Télécom
> 
> Tél (514) 381-5151 #101
> SF/TF 1 866-781-5151
> www.PointCA.com
>