The T610 hard drive is the formatter and has a special operating system software installed on if from HP. You can't format a hard drive and install it...so the whole formatter assembly needs to be replaced when the hard drive goes bad...
The error code 02.1:10 means the plotter has a communications problem between the main logic board and the carriage PCA. The possible parts at fault are: The Carriage PCA, Trailing Cable, or the Main Logic Board, all available here: Designjet T610 Parts
There is no User Guide available for download though.
You can also get a Service Manual (which is not a User Guide, but describes some functions of the printer) from this blog, that has a link to a rapidshare download page (make a note of the password necessary to open the downloaded rar file). Or you can download the the Service Manual from here (this is only a temporary link): http://dl.getdropbox.com/u/1322442/HP%20Laserjet%205P-5MP-6P-6MP%20SM.pdf
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