17 Aug
2015
17 Aug
'15
8:22 p.m.
On 08/16/2015 09:48 PM, drlegendre . wrote:
I placed a disk in Drive A and upon pressing RETURN
the display immediately
stabilized and went into a loop printing "BOOT ERROR" on successive lines,
eventually scrolling the original boot message off the top of the display.
Hey,
I dug out that machine's 'twin', and it does the same there (just to verify
that there's nothing odd about that behavior).
It did not seem to even attempt seeking the disk - and
it behaves the same
way, whether or not a disk is in Drive A. Tried this routine several times,
with minor alterations, and always the same - straight to the BOOT ERROR
scroll and no other activity in the drive.
Drive LED was on in all cases.
OK... behavior on mine (with no disk present) is that the drives spin, the
heads step in and out repeatedly, and the LED stays on.
Do you hear the drives spin at all? If not, perhaps check for 12V at the
PSU. I don't have schematics for the system handy, but it wouldn't surprise
me if it doesn't use +12V for the drive motors (spindle and head) and maybe
some of the auxiliary logic (e.g. modem and RS232), but not for the 'core'
logic - so a lack of 12V might give the symptoms you're seeing.
If it does have +12V, make sure it's getting to the drives - my memory's
hazy, but I think there's a little power distribution harness/board in
these systems, so there's some potential there for faults (broken wires,
dirty connectors etc.)
cheers
Jules