There's a partial CE Service Handbook, here:
http://www.hpmuseum.net/exhibit.php?hwdoc=555
Hi Mike, thanks for the steer.
That manual is interesting but does not seem to contain any of the basic operating
procedure.
e.g. I guess that it is OK to power the drive down with a cartridge in situ but will the
drive attempt to spin up and load the heads if I power it up?