ekijak@ARDEC.ARPA ("Edmund S. Kijak", POINT) (10/01/86)
To Peter Jaspers-Fayer Make sure all cables and wiring are connected securely, sometimes they vibrate loose. If that doesn't work, unplug the circuit cards and replug them in. Sometimes all the contacts are not making contact and the boards need to be reseated. Make sure you ground yourself before (and occasionally while) you are handling the boards to avoid damaging the boards with static electricity. This is probably rare but if it still doesn't work, at least you know you haven't added anything to the problem. You can ground yourself by touching a cold water pipe or the screw that holds the cover on a conventional wall socket plate or switchplate.. Come to think of it, check to see that any socketted chips are seated properly. Sometimes all the chip pins are not making good contact. Also look for solder bridges or conductive dirt shorting circuit traces or chip pins.