Rich Grise wrote in
news
DesignJet 2500CP
... an hour of searching HP's website and calling 800 numbers
resulted in pretty much nothing.

What's happening is, when we go to power up the plotter, it
reports "Initializing", does some mechanical stuff (but not
as much as it normally does) then says, "System Error:
010021 A6502230".


The user manual is available from the HP site as a PDF.

It says that an initialization error code of 65xxxx means printhead
failure, either ink tank is empty or an electrical problem in the head.
Solution is to replace the ink system. See p. 12-12.

Sounds like this machine has pretty good diagnostics built into it, and
if you figure out how to order replacement parts, you can probably fix it
yourself. Without even getting out your VOM!