26 Feb
2008
26 Feb
'08
11:54 a.m.
We have the original HP blueprints/schematics for the
HP 9810 and/or 9820.
I haven't scanned them yet as they are on big sheets. I should try to
copy/reduce them onto A4 and then scan them.
Nice. I can assure you those scheamtics do _not_ appear in the normal
HP9180/20 service manual (it's one manual convering both machines, and
apart from the PSU it contaisn no schematics). On the other hand, the
patents for those machines contain schematics of virtually everything.
Those 2 machines have about 60% of the boards in common. The CPU,
backplane, printer, card reader and PSU are common. The expansion
backplane is differnt (the 9820 allows DMA IIRC and has extra pins on the
module connecotors as a result), the memory box is totally different
(none of the boards are common), the keyboard and display are of course
different.
Yes, I've repaired both of them...
-tony