(ASCEND) Re: Our first Max dies today!

[Stephen Chen <stephen@eni.net>]

Phil,

This sounds like the typical power supply problem, where the older power
supply (Digital Power Corp US70-105) had failed due to the current being
draw by the newer 56K modem cards.

You can just call Digital Power Corp and order a replacement power supply
(USS100-245)that puts out 20 amps.  While you have the case open, I would
replace all of the fans with ball bearing fans.

Good luck.

Stephen


>I am relating the following story in the spirit of sharing war stories and
>in case someone might have experienced something similar.
>
>This afternoon one of our Maxes stopped working. It powers on and does
>nothing (no link integrity on the Ethernet, no messages on the console)
>I replaced it with a spare 4048, but this was a temporary solution as
>the busted Max is a 4004 and had 4 T1's.
>
>While playing with it, I noticed that it had two busted fans (out of
>three!), and that it actually works as long as there are no modems in
>it. The moment you put modems in it, it won't boot (even just one card).
>
>I noticed that the Max appears to have two power supplies, one next to each
>other (one on top of each other in the newer internal layouts), and they
>have different ratings. I wonder if there's supposed to be one for the
>modems and one for the motherboard?
>
>My final solution to this problem, to get things back online ASAP, was to
>open up the busted 4004 and the new 4048, and swap motheboards. Now the
>4004 works great with the casing and power supply from the 4048. And I'm
>left with a 4048 in which I can put no modems (because it has the bad
>casing). That's OK, I can use it for ISDN!
>
>Extra bonus: This 4004, which was by far our hottest Max, with 72 V.34
>modems in it, now has a newer style casing which has 4 fans. (And the
>ISDN only box now has the older casing with only three fans, but that
>doesn't matter, it won't get hot without modems!)
>
>- -Phil

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