Original question:
> I had an external harddrive go down recently on a sparc1+. After I
> removed the disk from the machine, the sun won't even start the
> "testing" procedure... it just hangs, and accepts nothing from the
> keyboard. I powercycled the machine few times with no effect.
>
> The external disk was a Micropolis in a shoebox. The sparc1+ has an
> internal disk with OS4.1.1. The testing goes through ok if I connect
> the external drive, but I don't want to do that!
Quick check from one expert:
switch the ethernet fuse with the scsi fuse and see if the system boots
Answer from the experts:
The SCSI fuse was blown.
Part: Littlefuse 273002 (2A Microfuse subminiature 125V).
Analysis from some experts:
- It works with the external drive attached because the drive is supplying
terminator power back to the internal terminators in the SPARCstation.
- To verify that it is the fuse, supply power to an external terminator from
an external device (eg. set the appropriate jumper on your disk). The machine
should boot up fine.
- Take the cover off and check both internal fuses with an ohmmeter.
Solution:
I got the fuse from a local electronics store ($2.10 for a pack of 2).
But one response pointed to:
Littelfuse (708) 824 1188, street address:
800E, North west Highway, Des Plaines, Ill.
One of many responses:
open up the machine, look on the motherboard close(ish) to the SCSI plug,
for a SCSI fuse (it looks like a small rod, 3mm diameter, one end
clear, the other end black, with two leads coming out of the black
end. Ground yourself, pull it out. Then go find/buy/borrow/steal
a replacement. I suggest if you can, get a couple of spare ones.
Note that when you have a blown SCSI fuse, even L1-A won't work,
and like you say you can't run diagnostics. Bummer.
Suggestion from the experts:
Never unhook any device before turning it off
(I think I did exactly that!)
Some other sugestions:
- try terminating the SCSI port
- motherboard might need to be replaced
- try scsi-probe [not possible, as original question states]
Thanks to the following experts for their great responses:
"John D. Barlow" <John.D.Barlow@arp.anu.edu.au>
pag@scg.boulder.co.us (Peter Gross)
Peter Samuel <peters@megadata.mega.oz.au>
Peter Shipley <shipley@tfs.COM>
zeke@mpl.UCSD.EDU (Rob Scott)
Wilson N G <noel@essex.ac.uk>
weingart@inf.ethz.ch (Toby)
birger@vest.sdata.no (Birger A. Wathne)
geertj@ica.philips.nl (Geert Jan)
baumeist@vsun04.ag01.Kodak.com (Hans Baumeister)
rick%pgt1@Princeton.EDU (Rick Mott)
poffen@sj.ate.slb.com (Russ Poffenberger)
Paul Rundans <rundans@zerkalo.harvard.edu>
rauls@usb.ve (LDC - Raul Silvera)
TS@CS-IND.Prime.COM (Ted Schafer)
trdlnk!mike@uunet.UU.NET (Michael Sullivan)
John DiMarco <jdd@db.toronto.edu>
Perry_Hutchison.Portland@xerox.com
This archive was generated by hypermail 2.1.2 : Fri Sep 28 2001 - 23:06:54 CDT