Subject: RE: more Multia repair part numbers and comments
To: 'John Hayward' <John.C.Hayward@wheaton.edu>
From: David Woyciesjes <DAW@yalepress3.unipress.yale.edu>
List: port-alpha
Date: 01/08/2001 11:17:08
Try replacing the battery. Weak or dead batteries tend to do wierd stuff in
the Multias...

---   David A Woyciesjes
---   C & IS Support Specialist
---   Yale University Press
---   mailto:david.woyciesjes@yale.edu
---   (203) 432-0953
---   ICQ # - 905818


-> -----Original Message-----
-> From: John Hayward [mailto:John.C.Hayward@wheaton.edu]
-> Sent: Friday, January 05, 2001 6:59 PM
-> To: Ross Harvey
-> Cc: port-alpha@netbsd.org
-> Subject: Re: more Multia repair part numbers and comments
-> 
-> 
-> Dear Alpha People,
-> 
-> Some time ago (ie 2-3 years) I had a Multia which was up 
-> running NetBSD.
-> Since then I needed the monitor for another machine and 
-> stopped using it.
-> I'm now in a situation where I can use this alpha (primarily 
-> as a router
-> running NAT for my DSL connection).
-> 
-> When I turned it on the monitor would not sync (it was a 
-> different monitor
-> than had run most reciently).  I then connected a monitor had been
-> connected previously.
-> 
-> I recall seeing a message something like "waiting to boot".
-> 
-> After cycling power and trying several more times the 
-> monitor shows only a
-> block cursor.  All three lights on the keyboard are on.
-> 
-> As I recall when it booted it went thru a cycle testing the 
-> video board
-> then presented some kind of boot menu.
-> 
-> Any suggestions on how to bring life back to this Multia?
-> 
-> johnh...
-> 
->  On Tue, 28 Apr 1998, Ross Harvey wrote:
-> 
-> > Date: Tue, 28 Apr 1998 02:35:15 -0700 (PDT)
-> > From: Ross Harvey <ross@teraflop.com>
-> > To: port-alpha@NetBSD.ORG
-> > Subject: more Multia repair part numbers and comments
-> > 
-> > OK, so I borrowed a supposedly dead Multia. Murphy's law 
-> is in fine form,
-> > though...when you _want_ a dead one, _specify_ a dead one, 
-> really can only
-> > _use_ a dead one (for the purpose of doing a friend a 
-> favor and testing the
-> > big multia fix) ...then...of course...it arrives and works 
-> just fine.
-> > 
-> > Now that I've seen the parts, the bad news is that they 
-> aren't likely
-> > to be in any catalog...good thing for me no one took up my 
-> offer on that
-> > bet. AFAICT it is going to be necessary to order them 
-> through one of the
-> > manufacturer's franchised distributors, and they can be 
-> difficult when you
-> > don't already have an account. Sometimes you can order 
-> samples through
-> > a web page, and certainly you can locate the distributer that way.
-> > 
-> > The generic thing you want is: (qty 6) a 20-lead .220 (i.e., medium
-> > body) soic 4.7K bussed (pullup) resistor network, with 
-> lead 20 as the
-> > common.  I think the Bournes parts are probably safe, I 
-> guess it was a
-> > bad batch, or possibly that thick-film part didn't like 
-> actually being
-> > _in_ the solderwave, which is what would have happened 
-> given that these
-> > components are on the bottom of the board.
-> > 
-> > And, I can now see why the Jupiter guys replaced the logic 
-> IC: on Tim's
-> > Multia the printing on the chip is starting to bake into a brownish
-> > off-white right in the center, i.e., over the die. I think 
-> it needs to
-> > go too, although using thermally conductive epoxy you 
-> could conceivably
-> > heatsink it...not much room to work with though. The 5% is 
-> perfectly
-> > fine as a tolerance, but if it is out of stock and the 2% 
-> or 1% is in
-> > stock...
-> > 
-> >         WhichOne        Mfr             Part Number
-> > 
-> >         R-network       Bournes         4820P-002-472
-> >         R-network       Dale		SOMC2001472J (5%)
-> >         R-network       Dale		SOMC2001472G (2%)
-> >         R-network       Dale		SOMC2001472F (1%)
-> > 	...there are probably more...
-> > 
-> > 	Logic-IC	TI		SN74ABT623DW
-> > 	Logic-IC	Philips		74ABT623D
-> > 	Logic-IC	Pericom		PI74FCT623TS
-> > 	Logic-IC	Pericom		PI74FCT623ATS
-> > 	Logic-IC	Pericom		PI74FCT623CTS
-> > 	Logic-IC	Pericom		PI74FCT623DTS
-> > 	Logic-IC	IDT		IDT74FCT623TSO
-> > 	Logic-IC	IDT		IDT74FCT623ATSO
-> > 	Logic-IC	IDT		IDT74FCT623CTSO
-> > 	...there probably are not any more...
-> > 
-> > This is almost trivial with the right lab, but it 
-> definitely isn't the
-> > easiest home project. Besides the difficulty of obtaining 
-> the components,
-> > you have 140 leads to remove and resolder...and you don't 
-> want to lift
-> > or destroy a single pad while doing it. At least it is a lot easier
-> > than if they were those ugly old dips.
-> > 
-> > Ross Harvey
-> > 
->