home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!beartrk!ceilidh!hijo-2!dnichols
- From: dnichols@ceilidh.beartrack.com (Don Nichols (DoN.))
- Newsgroups: comp.sys.3b1
- Subject: Re: Panic translator needed
- Message-ID: <1992Sep13.122000.10903@ceilidh.beartrack.com>
- Date: 13 Sep 92 12:20:00 GMT
- References: <1992Sep8.150249.25096@umbc3.umbc.edu> <ycqwqB1w165w@vector0.UUCP>
- Sender: news@ceilidh.beartrack.com (News)
- Organization: D & D Data
- Lines: 57
- Nntp-Posting-Host: pinata
-
- In article <ycqwqB1w165w@vector0.UUCP> jon%vector0.UUCP@sactoh0.SAC.CA.US (Dazed N. Confused) writes:
- >hybl@umbc4.umbc.edu (Dr. Albert Hybl (UMAB-BIOPHYS)) writes:
- >
- >> (A translation into something understandable would be helpful.)
- >
- > I second this. I've been getting panic messages every so often.
- >My unix.log shows several error messages called "Spurious Interrupt",
- >like 50 of them one morning. Should I ignore this stuff?
-
- Open up you machine, and pull the D.C. power connector (the one on
- the heavy-duty ribbon cable that goes to the CPU board) off. Now put it
- back on. Repeat several times. Now re-assemble the machine, and see if it
- works better (for a while).
-
- Acutally, while the machine is apart, you might check the power
- connector for signs that one of the pins is overheating due to too much
- current being pumped through an oxidized connection. If you can find
- Cramolin (the R5 version - red - is preferred) apply it to the connector
- pins and cycle the connector on and off a few times. This can help even a
- badly oxidized connector.
-
- Also, check the underside of the power supply board where the
- connector solders on. If the area around one (or more) of the pins looks
- grainy rather than smooth, or even worse lumpy, then get a good hot
- soldering iron, and some good *electircal* solder (*****NOT ACID CORE****),
- and clean out the joint and re-flow fresh solder into it. This can be the
- cause of your pin heating problems and your spurious interrupts.
-
- A spurious interrupt is one which was unexpected and unexplained.
- These can sometimes be caused by power supply glitches, which is why I
- suggested that you check out your connections there. The reason it is
- declared "spurious" is that when the registers of all devices using that
- inerrupt were checked, none registered as having requested one. (Or the
- inerrupt may be one which is not used in the machine at all. Only two are
- used in the bus, and perhaps a third one for the interrupt line to implement
- task switching form a timed pulse train.
-
- >> 6) The condition in (5) appears to fit FAQ# 43, so I open the
- >> machine and clean the mother board (top side only so far).
- >> This has helped although the conditions has occasionally
- >> recurred during normal start up.
-
- The reason for cleaning the board is that dust helps insulate the
- board from the cooling airflow, so the chips overheat. A conformal coating
- (which is needed only when you are planning on operating under excessive
- humidity) would only make matters worse in this area. (The board *does*
- have a good solder-mask, which insulates most of the traces, except where
- components are soldered to them.
-
- Good Luck to you both
- DoN.
-
- --
- Donald Nichols (DoN.) | Voice (Days): (703) 704-2280 (Eves): (703) 938-4564
- D&D Data | Email: <dnichols@ceilidh.beartrack.com>
- I said it - no one else | <nichols@nvl.army.mil>
- --- Black Holes are where God is dividing by zero ---
-