Am 21.06.2016 um 16:36 schrieb "aswood at t-online.de" <aswood at t-online.de>: Hello all, I do have an Symbolics UX1200 plugged into a Sun4 370 host. Before powering the host, just to be secure, I'd like to check the psu - or if the psu will be broken, I'd like to try to fix it. Yesterday I'd a look into the psu - very complicated layout! Is there any known documentation, servicing and maintenance documentation or schematics for psus used in Sun server/workstation available, of course esp. for psus used in Sun4 370 systems? -- Andreas ?