Oh yes, that's looking good :-) Thank you very much Mattis! BTW: Some years before I helped to repair and administering the east german copy of an 11/780.. the Robotron RVS K1840. The console Processor of this beast was an Robotron K1620, the slowest PDP-11 ever made but it was enough to load the microcode :-) The 1620 used two 5,25" Floppies instead of the 8" one in the 11/780.
Best regards, Holm Mattis Lind wrote: > That is a BA11-M box with a H780 supply. The schematics can be found in the > KC780 document since the front end processor of the 11/780 is a PDP-11/03 > with a RX01 drive. > In the end of this document there is a schematic: > > http://bitsavers.org/pdf/dec/vax/780/MP00534_KC780_Nov77.pdf > > Good luck! > > /Mattis > > Den mån 13 mars 2023 kl 10:57 skrev Holm Tiffe via cctalk < > cctalk@classiccmp.org>: > > > > > Hi all, > > > > I have to repair an PSU of a 11/23 n a BA11 Box with an H9720 Backplane > > (with an KDJ-11A) that has run an CNC milling machine until 2 weeks > > before now. :-) This is a Fidia machine..never heard about it before. > > > > The problem is that a big 19000µF 40V capacitor in the PSU has failed > > and that I think because of that the 2nd of the two Nidec fans has > > finally failed. > > I'm in the process of cleaning the goo from the PSU-PCB, found a burnt > > 5A fuse and now I'm checking the Semiconductors... > > > > The problem is here that the Transistors (and diodes) have uncommon > > types printed on, an TO220 is named SJE2677, another one is labeled > > 12652-00 RCA..and so on. > > I've found a label with "0H780-B" on the PSU.. H780 PSU? > > Where can I get some schematics from that beast? It is a secondary > > switcher ist seems. > > > > Regards, > > Holm > > -- > > Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, > > Goethestrasse 15, 09569 Oederan, USt-Id: DE253710583 > > i...@tsht.de Fax +49 37292 709779 Tel +49 37292 709778 Mobil: 0172 8790 > > 741 > > > > -- Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, Goethestrasse 15, 09569 Oederan, USt-Id: DE253710583 i...@tsht.de Fax +49 37292 709779 Tel +49 37292 709778 Mobil: 0172 8790 741 ----- Ende weitergeleitete Nachricht ----- -- Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, Goethestrasse 15, 09569 Oederan, USt-Id: DE253710583 i...@tsht.de Fax +49 37292 709779 Tel +49 37292 709778 Mobil: 0172 8790 741
