There are only 2 replies to my question and the solution in our case was a
bad adaptor.
The following are the suggestions that I received over the net:
Thanks to: Harvey M Wamboldt & Marc Newman
1. First: If you do poke around the hardware, YOU MUST OBSERVE AT ALL
TIMES proper static precautions and DO NOT touch the hardware with
power applied.
On 28 Sep 1998, J Leung wrote:
> Can't clear ESP interrupts: check SCSI Term. Power Fuse
Sounds like it's telling you to look for a fuse for the SCSI Terminator
Power. This would probably be a small device somewhere on the
motherboard, probably near the SCSI connector. It may be soldered in
place. Assuming you have a regular single-ended SCSI, you can check to
see if you have terminator power on the SCSI bus by checking that you
have 4.8 volts DC (or greater) on pin 38 of a 50-pin SCSI bus and on
pins 17, 18, 51 & 52 of a 68-pin SCSI bus. If the fuse on the
motherboard is blown, all is not lost. You may be able to get power on
the SCSI bus from the external drive. You will need a manual for the
drive (if it's a Seagate, you may be able to find one at
www.seagate.com) telling you which jumper is which. SCSI terminator
power can usually be provided from a hard drive by moving a jumper
somewhere on the drive.
Before you turn on the terminator power though, you should find out
what happened to the fuse. You can sometimes blow drivers (or if you
are lucky, the fuse) if you have too many terminators installed on the
same SCSI bus. You should check the jumpers on all external drives to
see whether their internal terminators are enabled or disabled, and any
other devices on the SCSI bus as well. Remember, only use two
terminators, one at each end of the SCSI bus. A lot of SCSI problems
can be traced to having internal (built-in) terminators enabled when
using external terminators at the same time. Another problem, far less
common, occurs when different devices on the SCSI bus are connected to
different power supplies. I once had two devices side by side with a
50 volt difference in grounds between them. This can happen where
grounds float, a common problem on a ship, and can also be caused by
wiring problems, or where power is supplied from different sources
(such as two backup generators). Other than on ships, this is a pretty
rare problem. A few volts difference would be more than enough to blow
fuses.
Hope this helps,
2. Some SCSI devices, especially disks, have jumpers for internal
termination. Unterminate your drive, it should work better.
Original Question
_________________
Hi, gurus! When the Sparc20 running Solaris 2.5 rebooted, it came up with
the following error message twice: Can't clear ESP interrupts: check SCSI
Term. Power Fuse We have the Sparcstation connected to an 8mm tape drive
and an external disk drive. Doing a probe-scsi reveals that the system
could reach/see its internal disk drive and the tape drive, but not the
external disk drive. Swapping another SCSI cable and/or terminator on that
external disk didn't seem to help. Does it mean that the power fuse of
the external disk drive needs to be replaced? Or what else could I check?
Regards, Janet
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