alphaserver 2000 fan cablings?

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Article #15821

#15821

From: Antti Järvinen
Date: Tue, 15 Jul 2003 18:11

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Hello,

I've got disassebled as2000 that has no fans. System behaves just like 
ftp://ftp.digital.com/pub/DEC/Alpha/systems/as2000/docs/service_hypertext.zip
tells it to behave when there is a fan failure: at bootup it will power down
almost immediately. 

Could some kind soul open the lid of his/her as2000 and send me a brief
description of how fans connected. A picture is the preferred method,
but any media is ok. Document mentioned above tells that
there are 2 fans: one cooling the disk shelves and another the rest. The
fan connector on main board has 6 pins and I've beel told that the pin
assigment is this:
   +---+
   |123|
   |456|
   +---+
     ^
     | 
     a snap      

1-3 gnd
4 +12v
5 +12v
6 rotation speed measurement

and I`m curious where is the speed measurement of the second fan? There must be
something wrong with above picture -> if there is normally 3 wires going to
one fan then above connector with 6 pins is enough but how is the cabling
arranged? What goes where and from which point? For example, are both fans
connected to same connector? And what are the colours of the wires leaving
from each connector ending to each fan? 

Thanks a million for a hi-res picture that shows above :-) 

--
Antti, costello@iki.fi

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From: costello@iki.fi (Antti Järvinen)
Newsgroups: comp.os.vms,comp.sys.dec,comp.os.linux.alpha,fj.sys.alpha
Subject: alphaserver 2000 fan cablings?
Date: 15 Jul 2003 21:11:43 +0300
Organization: oreganozation
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