27 Jun
2012
27 Jun
'12
2:14 p.m.
Snip
> Unfortunately, the drive appears to be failing
the built-in
> diagnostic; there's a single LED that goes on when the test starts and
> it's supposed to go out within a minute if the diagnostic's passed.
> The LED on mine just stays on permanently. Unfortunately that's the
> -only- diagnostic indicator on the unit. I've read through the
> service manual and unless I'm missing something it doesn't really
> describe how to go about narrowing down the problem. There's a
> flowchart that basically says "if the light doesn't go out, it's a
> problem with the controller in the drive unit" which seems fairly
obvious...
I asusme you've looked at the the schemaitcs and pnaiced. There are a few
boards of stanadrd logic, things like the disk data shift registers, data
separateor, etc. And then there's that board with the HP custom
'nanocontroller'
and firmware ROms on it. AFAIK HP never docuemtned
this nanocontroller,
the
instruciton set is not known (I would love to be wrogn
about this) so
tryign to
disassabmble the firmware is a non-starter.... And
without knowimg what
that
firmware is doing you are essentailly working blind.
-tony
Doesn't the nano-controller use the HP 2116 architecture and commands, like
the BPC and other earlier HP processors like the ones in HP 98X0 series ?
-Rik