VAXstation/MicroVAX 2000 CPU/FPU overheating?

Hi Guys, I've just acquired a VAXstation 2000 (thanks Mouse!) which exhibits what appears to be an overheating issue. Powered up ir runs for about 10 mins or so (just sitting at the console prompt doing things like TEST 50 to display the configuration, pressing ENTER to get another '>>>' etc.). After about 10 mins (give or take) it fails, sometimes appears to reset, hangs etc. Firt thing I noticed is that the two surface mount chips with the round heatsinks affixed to them get *HOT* ... Hot enough that you wounldn't want to keep your finger on either of them for very long. I believe these are the CPU and FPU chip? - Is this normal for them to run this hot? They don't heat up alarmingly quickly, but after a few minutes they are hotter than I'd think normal. Aside from the eventual failure, it seems to run correctly - the self tests (including the FPU test) pass (except for those which don't have hardware installed, loopback connectors etc. When I got the system, it was jam packed with cards, including the main board, color frame buffer, double-sided memory expansion and an ethernet interface. During my testing, I've removed all of these except for the main board, and am running the system as a MicroVAX. I do have the resistor/loading card installed as is recommended when running the system lightly loaded. Power rails all look good - There is a 9V supply which the technial manual describes as "for loading" which has a separate supply and return. Relative to ground I measure about +5.6v on the supply and about -3.3 on the return, which I'm assuming is normal (?) Anyone know where I can obtain anything resembling a schematic? Other technical information (I have a PDF of the technical manual, however it's mostly "system information" from an operational point of view). Any known issues etc.? Regards, Dave -- dave06a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.classiccmp.org/dunfield/index.html