Tony, reverse engineered the HP 9836C (and a lot of
other HP equipment) he
made the diagrams available through the HPCC.
It's part from a great collection of HP diagrams including calculators computers
and peripherals etc..
http://www.hpcc.org/cdroms/index.html
It was decided by the HPCC committee to no longer send out physical CD-ROMs for
this. Instead members (only) can download the latest version free of charge. A year's
membership of HPCC is not much more than the only cost of the CD-ROM, and you
have the other benefits of HPCC.
The HP9826/36 schematics can be downloaded from the Australian HP museum,
http://www.hpmuseum.net/
They are under the HP9826, there is so much in common between the machines that
I produced one set of diagrams for both. I did the 3 machines I have, a 9826, a 9836A
and a 9836CU. Yes, I did include monitors, etc.
-tony