HP Forum Archive 09

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Woodstocks on the barbie... Message #1 Posted by John Garza (3665) on 9 Nov 2002, 5:36 p.m. Just how fragile are woodstocks when it comes to static electricity? I have a 21, 25, and 27 that were put up a year ago in perfect working order. Now they exhibit blank displays & odd symbols & counters when powered up. They were in a temperature controlled room, not subject to handling for a year. But now they seem to have spontaneously deteriorated. In reading the archives, I'm led to believe it could be old capacitors in the power supplies, or (even worse) static electricity as they were kept in plastic storage boxes with dessicant packets. Any one know the values of those tantalum caps, or a replacement cource for 21,25 ACT chips? I've read the 27 will require an "organ donor", as they're hard to come by. -John

Re: Woodstocks on the barbie... Message #2 Posted by David Smith on 11 Nov 2002, 4:04 p.m., in response to message #1 by John Garza (3665) You may have corrosion growing inside the machines. Open them up (two screws under the top feet) and clean the circuit boards with 91% isopropyl alcohol. Let dry overnight. Often times the culprit is not visible to the naked eye. The only replacement chips are from another machine. The 21/25/29/67/97 ACT chips are interchangeable.

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