[SunRescue] Sun 4/670 problems

[Michael S. Schiller]

Michael:

I don't remember what your original problem was, but if it was getting the
internal scsi tray working on a 670, I found out something really
interesting the other day. When you open up the separate SCSI 'drawer' you
will find a circuit board with 2 SCSI connectors on it, and 4 power
connectors. Well, I know that the SCSI has to be a loop going from one
connector to whatever drives are in the box, then back to the other
connector. Well, I did this using a generic SCSI cable I had here, and no
go, the SCSI stuff didn't work at all. After careful examination of the
board inside I discovered that the connectors key (the slot in the
connector) is wrong! You need a special cable with the 2 outside
connectors reversed from the rest of them for the SCSI stuff to work
properly. All I did was grind off the key on the cable, reverse it, and
now everything works wonderfully! I hope this info helps.

-Mike

Michael Graziano wrote:

> This thread doesn't seem to have generated much interest (c'mon, I
> know somebody else has to have one of these old crates lying around!).
> I figured I'd post an update on where I am at (which isn't too far from
> where I was, but it's an improvement I suppose) -
>
> In a burst of energetic activity, I have completely disassembled my
> 670 (for what is probably the first time in its 11 year lifetime).
> I will be taking pictures of the whole extravaganza before putting
> it back together and I will drop another note in this thread when
> I have them up.  In the mean time I'm busily searching for the source
> of my mysterious "Unexpected Phase = 0" error (see below), and
> carefully cleaning the dust and rust specks from the innards of my
> beloved monster.
>
> I looked at the board the drive cages connect to in hopes of finding
> my problem and noticed that there are three resistors on the left
> side looking toward the connectors as though inserting the drive tray).
> Do these suckers terminate the SCSI bus for me (*clueless look*)?
>
> A bit more info, the drive enclosure on my machine only has one SCSI
> port (not the SCSI In/SCSI Out I've seen mentioned here).  I don't know
> if that gives you folks any more clue about it or not.  There are also
> 4 power connectors and 4 ceramic fuses on this board (I will try to
> make pictures of the whole disassembly available this weekend, so if
> anyone thinks they might be helpful let me know and I'll post the URL)
>
> On the brighter-than-a-billion-watt-lightbulb side, there doesn't seem
> to be any damage to the boards inside the 670 from when she fried the
> disk adapter (thank your favorite deities, I doubt I could repair too
> much damage on something this old).  Unfortunately this still leaves
> me in the dark about the "Unexpected Phase = 0" error, so just to be
> safe the old multimeter is coming out this weekend to test the
> SCSI-Related bits.
>
> I will still sell my first born (or my brother if you can't wait) for
> some technical manuals or schematics.  I don't know if a FEH exists
> or if any of you have one, but it would be great if someone does.
> The same basic idea holds as in my prior mail:
> > manuals, whatever for these old beasts I would much appreciate a
> > copy (scanned, photocopies (I'll pay for paper and shipping), or
> > original manuals if anyone is willing to part with them for a
> > reasonable price).
>
> Thanks again,
>
> /~mikeg
> _______________________________________________
> rescue maillist  -  rescue at sunhelp.org
> http://www.sunhelp.org/mailman/listinfo/rescue

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