Need help with 2 projects. (TI and Xerox)

Hi, All I am looking for repair manuals for a TI 990/12 Business system. mine has no output from the Power Supply board. Fans come on. I have dozens of manuals but all have to do with operations and software. The only service info. is a folder with full of Xerox tech call logs and reapir invoices. The second machine is a Xerox Star. I have the software and operating manuals. I would like to find the stand alone common software disk or a disk image. I have only the network disks and booting it with out the network server is a pain. Of coarse if someone in the Seattle area has a Xerox 860 server they want to part with I can have my own Xerox network and Space heaters. ;-) I would also like to find the sys admin. type manuals. (set up, software install) Thanks, In advance Jerry Jerry Wright JLC inc. g-wright(a)att.net