HP 30s screen & brain have been water-damaged, but I enjoyed this calculator
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From: Merciadri Luca on 14 May 2010 17:04 Hi, I have some old HP 30s, and as every HP stuff, I like it. The problem is that some strange guy threw water on it when I was at secondary school. It does not perform correct computations anymore, i.e. it does not deal correctly at all with powers, but there is also a screen problem. How could I repair it? I can still change the screen, but for the calculations? Thanks.
From: ChrisCoaster on 14 May 2010 21:59 On May 14, 5:04 pm, Merciadri Luca <merciadril...(a)gmail.com> wrote: > Hi, > > I have some old HP 30s, and as every HP stuff, I like it. > > The problem is that some strange guy threw water on it when I was at > secondary school. It does not perform correct computations anymore, > i.e. it does not deal correctly at all with powers, but there is also > a screen problem. > > How could I repair it? I can still change the screen, but for the > calculations? > > Thanks. ___________________ In hindsight, no buttons should have been pressed even after you wiped off the exterior of the calculator. That is - no circuits should have been allowed to complete - what happens when you press buttons on the calc. The calc should be dismantled - if readily so - and allowed to dry under a bright lamp or the sun. Reassemble and it *should* work like new. That was all that was spilt on it - water? -CC
From: Merciadri Luca on 15 May 2010 06:58 > Tear them apart and clean the guts with a dry paint brush. It > probably has some corrosion damage from the soaking. Done, nothing better. > > Also, there are 8ea HP-30s calculators on eBay for an average prices > of about $15/ea. Yeah, I know, but I even have a HP-50g, which is clearly better. That is not the problem. The problem is that I like(d) this calculator.
From: Merciadri Luca on 15 May 2010 07:21 On May 15, 3:59 am, ChrisCoaster <ckozi...(a)snet.net> wrote: > In hindsight, no buttons should have been pressed even after you wiped > off the exterior of the calculator. That is - no circuits should have > been allowed to complete - what happens when you press buttons on the > calc. The calc should be dismantled - if readily so - and allowed to > dry under a bright lamp or the sun. Reassemble and it *should* work > like new. That was all that was spilt on it - water? Yes, only water. The problem is that water was spilt on it not only all over one face, but over both faces. After having opened it, etc., I also realized that the main board is slightly broken at its end: some circuitry portion is raised upward, showing some slight damage, probably done with a screwdriver. I assume that the whole stuff was sticking out because after having opened the calculator (to see this and to check connections) and closed it, it does not work anymore. I re-opened it, did my best to join both parts, but it does not want to work anymore. Is it ready for the trash? It only shows slight damage. Thanks.
From: ChrisCoaster on 15 May 2010 09:13
On May 15, 7:21 am, Merciadri Luca <merciadril...(a)gmail.com> wrote: > On May 15, 3:59 am, ChrisCoaster <ckozi...(a)snet.net> wrote:> In hindsight, no buttons should have been pressed even after you wiped > > off the exterior of the calculator. That is - no circuits should have > > been allowed to complete - what happens when you press buttons on the > > calc. The calc should be dismantled - if readily so - and allowed to > > dry under a bright lamp or the sun. Reassemble and it *should* work > > like new. That was all that was spilt on it - water? > > Yes, only water. The problem is that water was spilt on it not only > all over one face, but over both faces. > > After having opened it, etc., I also realized that the main board is > slightly broken at its end: some circuitry portion is raised upward, > showing some slight damage, probably done with a screwdriver. I assume > that the whole stuff was sticking out because after having opened the > calculator (to see this and to check connections) and closed it, it > does not work anymore. I re-opened it, did my best to join both parts, > but it does not want to work anymore. Is it ready for the trash? It > only shows slight damage. > > Thanks. _______________ That slight damage to the circuitry may be all it takes. The width of the paths of those ciruits is designed to carry specific voltages with a specific resistence. If one is cut even slightly through the proper voltage(signal) will not reach its intended destination. That is all I know about that and someone else may have a better answer. In addition, they may also have a better answer than the one already provided to the problem I posted about my JVC VHS-DVD combo video heads(!) -CC |