Re: (ASCEND) Max 4000 Power Supply

["Paul M. Ledbetter" <Paul@austintx.net>]

Update on the 4000.

We received the new upper power supply and installed it.

Once we replaced fans we were ready to power it up.  We only put the unit 
back together enough to test everything out.  No modem cards installed, 
just the chassis together basically.  All it did was spin the fans and all 
4 lights on front just glowed.  Nothing more.  Put a terminal cable on it, 
and received no data.  Guess the power supply failure was a bit more 
damaging to the unit that just itself.  Possibly the lower power supply is 
bad too, but no conclusive proof to that.  It looks fine by a visual 
check.  We are going to put a meter on it and see what we can figure out.

Next?

Paul M. Ledbetter
Austin Internet Access

At 01:17 PM 2/2/00 -0600, Paul M. Ledbetter wrote:
>At 12:15 PM 2/2/00 -0600, Jim Logan wrote:
>>At 09:46 AM 2/2/2000 -0600, you wrote:
>>>Anyone had a 4K power supply fail?  What was the end damage?  Were you 
>>>able to find both supplies from a third party, or did you have to go 
>>>back to Ascend?
>>>
>>>Ours appears to have failed big time and we have another one on it's way 
>>>(Thankfully other suppliers besides Ascend have the one that blew), and 
>>>we are wondering if anyone else had one fail.  Once you replaced the 
>>>P/S, did the unit function correctly?  Did you ever figure out why it failed?
>>>
>>>Ours appear to have over-heated, but yet all of the fans "appear" to be 
>>>free moving when spun by hand.  This unit has always done well, and 
>>>never skipped a beat.  I hate to see it go down in flames like this, but 
>>>after 3 years, anything goes.
>>
>>   The good news, there are 3rd party sources for the power supply as 
>> well as the fans. I can give you some of that info if you want.
>
>That would be great!  I have found a source for the upper supply, but not 
>the lower one and might need that info if it turns out to be bad 
>also.  The top supply actually had "expanded" capacitors and diodes, so I 
>think it took the brunt of the blow.
>
>Now, as for the fans, I think I had better replace them, just to be on the 
>safe side.  At this point, new is better....
>
>
>>   The bad news,  what we have found out is that a 'shorted' fan is what 
>> typically blows the supplies and you can risk loosing the main board via 
>> the spikes caused.  There is no alternative sources for the main boards.
>
>This is the part that scares me.  I can only pray that the board was not 
>affected.  We did have a power outage on Monday and even though the unit 
>is on a UPS, it ended up rebooting.  Maybe that is pure coincidental, but 
>it is more data for the diagnosis.
>
>Thanks for all of the help!!
>
>Paul M. Ledbetter
>Austin Internet Access


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