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- Path: sparky!uunet!olivea!hal.com!darkstar.UCSC.EDU!cats.ucsc.edu!master
- From: master@cats.ucsc.edu (The Master)
- Newsgroups: comp.sys.sun.hardware
- Subject: Sun 3/60 problems
- Summary: hardware failing
- Message-ID: <18et21INNe2b@darkstar.UCSC.EDU>
- Date: 7 Sep 92 06:32:33 GMT
- Organization: University of California; Santa Cruz
- Lines: 34
- NNTP-Posting-Host: am.ucsc.edu
-
-
- My sun 3/60 has started having some problems, and am posting in the
- hope that someone may know how to fix it rather than replacing my machine.
-
- The basic problem is that after it has warmed up, it will sometimes die.
- It seems to be heat related. What basically happens is that the display
- seems to get scrambled (it constantly shifts, almost like one of the vide sync
- signals is out of wack), and the cpu pretty much halts (any activities
- that were being done through the serial ports stops working.) The
- kernel does seem to have enough time to write a 0 length core file in my
- directory. If I power cycle the machine, sometimes it will come up
- and start to boot normally (after checking the memory), and other times
- gets the same type of screen behaviour.
-
- Also, when in this state, the DTR line on ttyb fluctuates rapidly (I have
- a call in modem hooked up to it.)
-
- The machine is a non networked 3/60, 16 megabytes, cgfour display. I have
- noticed that it seem to happen more often when I start using it again after
- I had finished with it the previous night (when I power on the monitor and
- start to do something.)
-
- Also, typically before it crashes, the display makes small shifts to the
- left and right (ie, the entire dispaly shifts about 5 pixels right, it stays
- like that, and then shifts back to where it was.) No part of the screen
- information is actually lost, rather just where the boundries of where the
- screen are changes slightly.
-
- My guess is that the cgfour may have a bad part. I did notice that there
- are a few parts (resistors or diodes) that don't seem to be part of the
- normal board, but perhaps these are just standard add ons?
-
- Mark Wedel
- master@cats.ucsc.edu
-