I know it is a very old thread, but did you end up getting the manual? I sent Chroma an e-mail asking for a copy of the user manual for a 6512 AC source and got an e-mail a few days later from the Australian distributor with the manual. It gives me a local point to get parts from if ever I need them too.
If you didn't have any luck, I can send a copy of the 6512 manual, the commands might be similar