Noel Chiappa wrote: > > From: Holm Tiffe > > > Anyway, thanks for the schematics > > Eh, de nada. > > > I have the board running again. The fix was simple, the xtal was bad. > > You're lucky it was something so simple! (Although we've seen this kind > of thing before - I had that 11/23 with a bad crystal.) > > I've got three dead 11/73 boards (from someone else), but none of them are > that easy. Different symptoms on all three, but I suspect the State Sequencer > gate array on all three. On one, at least, the ILOE latch control signal from > that gate array is sitting at 2V (which I seem to recall is characteristic of > a TTL input that's not being driven). > > Maybe it's just some corrosion, and re-seating the gate array (if I can work > out how to unseat it - don't have the extraction tool) will fix it. > Otherwise, I'm SOL. At least the J11 there are spares for - that gate array > is surely umobtainium. > > Noel
I do have an extraction tool, but was unable to extract the chips out of the sockets w/o braking one socket... ok soldered in a new one and put the chips back after cleaning the pins with a glass hair brush.. There is a german company that saves chips from old pcb's, If you are sure that you need a chip, try to search the numbers in ther database: http://demotronic.de/ I found at least the gate array type.. Search for all numbers, not only the "real" type. Regrads, Holm -- Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, Freiberger Straße 42, 09600 Oberschöna, USt-Id: DE253710583 www.tsht.de, i...@tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741
