Remember that UPS provides about 7 seconds run time to the system but spends the rest of its battery life supporting 'continuously powered main storage.' This is so that in a power outage the memory is still available to be copied to the system ASP and referred to during subsequent IPLs. That's what the 1 foot 'many conductor' cable that comes up from the UPS to the planar board is for.

The system will come up without the UPS and of course with what is desired to be done with it not having the UPS won't hurt, however those still using a 9406-720 for production will NOT want to bypass this UPS.

- Larry "DrFranken" Bolhuis


On 4/13/2012 6:50 PM, Roberto José Etcheverry Romero wrote:
typical UPS battery failure.
If you have enough c19 cables you can just bypass the UPS and connect
both PSU to the grid.
Should work.

Best Regards,


On Fri, Apr 13, 2012 at 5:50 PM, DrFranken<midrange@xxxxxxxxxxxx> wrote:
Those power supplies have 'two halves' as it were. One part is always
on as long as the plugs are in, that's the part that runs the service
processor and the service processor is what communicates with the
control panel. If that part is dead the control panel is dark and you
can't start the thing up.

Why is this important? Because if the 720 isn't the littlest one, the
power supplies on the left (CPU) and right (Expansion) are identical.
Since that part of the supply isn't used on the expansion side, you can
swap them left and right sides and get the server back running if that's
the problem. A large number of screws must be removed and replaced but
at least they are all the same!! (and don't miss the ones that come in
from the back of the server!)

- Larry "DrFranken" Bolhuis

On 4/13/2012 3:44 PM, Jim Donoghue wrote:
On the back of the unit, right side, just to the left of the power plug -
looking through the vent holes, when it is plugged in there should be a
green light (the light comes from a LED on the circuit board inside of the
power supply). If you have connected all the power cables correctly, and
this light is not on, the power supply may not be functioning.

Jim
On Apr 13, 2012 2:22 PM, "Ricky Thompson"<rickyt29@xxxxxxxxx> wrote:

I have a old 720 AS/400 (i think 9406 model) that has not been ran in a
couple of years but was working fine when put in storage and was kept in
good condition. I plugged it up the other day and the power supply fan
comes up but the front panel never lights up. I'm getting power to each
tower unit as I checked the cables coming from the power supply. What
would the next thing you would look for? Is there an internal battery that
would cause the front panel not to come on? Any guidance on what to look
for and where to look would be appreciated.

Thanks
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