On Sun, 15 Apr 2001, Martijn van Buul wrote: > Hey. > > I finally found some time to pick up a 2001-32B w/ 8050 and 8023 printer > yesterday, which I had been kindly donated (Thanks, Ruud!). All seems > to be working (except for the keyboard of the 2001, which probably needs > to be cleaned badly. However, I don't have any experience in cleaning > B-keyboards; they're totally different than the keyboards I know..). You need to remove the keyboard from the computer (there are screws on the top and bottom edge). If you have a shift lock key, you will have to unsolder the 2 wires connecting it to the rest of the keyboard. Be careful not to overheat the switch mechanism as that will damage it. I usually replace the two wires with longer ones so that I will not have to do this again (you WILL have to clean the keyboard again). You then remove all those little screws on the back of the keyboard and open it up. Clean the circuit board and rubber contacts with isopropyl (rubbing) alcohol. 90 per cent alcohol is better than 70 per cent as it removes all traces of water as it evaporates. As the rubber contacts age they shrink and do not make contact with the circuit board anymore. When this happens I remove the rubber contact from the bottom of the key and fill the space under it with a piece of eraser stick and then put the contact back on over the eraser. This holds the contract out so that it will now make contact. Occasionally, a circuit trace will break from the reapeted flexing of the keyboard from use. In this case you will have to track down the break with on ohmmeter and solder a jumper across the break. > The 8050 however is giving me headaches. It worked as a charm when I turned > it on after some cleaning and a visual check. However, halfway during > a backup from drive 0 to drive 1, a thick white smoke came out from the > small shielded area behind the power supply. I've opened it up, but there's > no visual damage whatsoever, and the unit still works like a charm. So, > my question is (What's that for an introduction :): It was probably dirt or a bug(literally) that burned off as it warmed up. > Does the 3-pronged AC socket used in the (European) 8050 (and probably in all > other PET-alike devices...) have a line filter? In that case, I know what > happened.. The thing makes a 'nice' "twang" when turned on. I've got a a 3032 > with similiar sounds at startup, and I'm beginning to see why. The "twang" is from the power surge in the transformer. These early machines have rather large power transformers. - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tml.hut.fi.
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