[Soekris] Hard power problem with net5501-70

[ymartin]

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

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