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.

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.

This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list
To post a message email: MIDRANGE-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
or email: MIDRANGE-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives

This thread ...


Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2020 by and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].