apple Lisa2. Keypads

Hi Ray, Ah, so you wrote that repair stuff at lisafaq.sunder.net . A very useful site which I have refered to often during this Lisa restoration. I opened the keyboard tonight following the instructions in the FAQ. It was the mylar disks and the pads allright. Note this photo. http://www.classic-computers.org.nz/blog/images/2010-12-23-lisa-pads.jpg The silver disk you see is the working number 4 key. The only key apart good shape either as can be seen from this photo. http://www.classic-computers.org.nz/blog/images/2010-12-23-lisa-pads-degrad… that's indeed the cause. Looks like it's not too hard to fix, althoughfiddly. Thanks for providing the info.Terry----- Original Message -----From: "Ray Arachelian" <ray at arachelian.com>To: "General Discussion: On-Topic and Off-Topic Posts"<cctalk at classiccmp.org>Sent: Thursday, December 23, 2010 10:19 AMSubject: Re: apple Lisa2. Any advice on non-working floppy drives?> On 12/22/2010 12:56 PM, terry stewart wrote:>> Alex, so you really think this might be the cause? The web-info I've>> read on the Lisa suggests it's usually the pads that wear out causing>> non-responsive keys and that these should be replaced. However what's>> odd is...>>>> 1. All the keys feel very firm, with no sign of the "mushiness">> mentioned in some of the info.>> The mylar disks can still go bad. There maybe be dirty areas where the> mylar disks go down, there might be a short.>>> 2. ALL the keys expect for one (i! n two keyboards) are not working AT>> ALL no matter how hard you press. Yet the '4' in one and the '/' in>> another are working fine and with no pressure needed at all? In the>> third keyboard NONE are working.>>>> It would be great if the problem wasn't the pads, but something more>> easy to fix.>> Laziness is only a virtue for programmers. :-) Whatever's broken is> whatever must be fixed. Could be pads, could be something else.>>> It's hard to believe the pads could deteriorate 100% on all keys bar>> one. And on that one they are fine? Anyone on the list had>> experience with Lisa keyboards and could comment?>> Yes, of course. Why do you think I keep sending you to> lisafaq.sunder.net for repair info? :-) Those are my repair> experiences. It's much easier to write up a FAQ and point people to it> than to individually write answers for specific repair questions. It's> a fairly easy repair.>> Another thing to do: Get a can of contact cleaner, the spray kind.> Unpl! ug the Lisa. Get some paper towels and lay them down under the> Lisa. Spray the stuff nice and thick into the keyboard jack, wait a> minute, flip the Lisa forwards so the stuff can run out, hold it like> that for 15-20 minutes until dry. Might be the jack.>> Also wipe down the contacts on keyboard jack too.>>>>>> I'll be opening them up in the next day or so so I guess I'll soon see.>>>> When you do, check all 3 the wires in the keyboard connector against> where they hook up to the keyboard electronics. Maybe the wires arebroken?>> Carefully clean the "contacts" (quotes because they're not really> contacts, they're capacitance sensors.) on the board. Make sure there's> no shorts from ancient dust/debris/etc.>> Look at all the mylar disks, if they're not intact, replace them. Odds> are, this is your issue.> The foam is easy to fix, just buy double sided foam tape. Hardware/Home> repair stores should have it.>> The only hard part is cutting them into rounds of the right shape.>>>> Terry>>>>>>>> ----- Original Message ----- From: "Alexandr! e Souza - Listas">> <pu1bzz.listas at gmail.com>>> To: "General Discussion: On-Topic and Off-Topic Posts">> <cctalk at classiccmp.org>>> Sent: Thursday, December 23, 2010 12:46 AM>> Subject: Re: apple Lisa2. Any advice on non-working floppy drives?>>>>>>>> Well, not quite. One has the '4' key working on the keypad, the>>>> other has the '/' key working. But that's it.>>>>>> Terry, if ONE of the keys is working, there must be a stuck key or>>> a bad contact in the connector betweek the controller board of the>>> keyboard (inside it, of course) and whatever brings the switch>>> contacts to it (probably a membrane). I'm sure you'll be very lucky>>> on that :)>>>>>>>>>>>>>>