HP 48SX does not switch on
in [HP48]
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From: Marck on 21 Jan 2010 10:23 Hi all, I pulled out of the box after many years my HP 48SX which is in perfect conditions...except for the fact that it doesn't switch on! Of course I put 3 new batteries in it.. but nothing happens. Does anybody know if I can perform some little tests to try to understand what's happening and fix the problem? Many thanks to all of you. Marck
From: Han on 21 Jan 2010 12:52 On Jan 21, 10:23 am, Marck <marck-DO-NOT-USE-T...(a)microsoft.com> wrote: > Hi all, > > I pulled out of the box after many years my HP 48SX which is in perfect > conditions...except for the fact that it doesn't switch on! > Of course I put 3 new batteries in it.. but nothing happens. Does > anybody know if I can perform some little tests to try to understand > what's happening and fix the problem? > > Many thanks to all of you. > Marck Underneath one of the four rubber feet is a reset hole that you can try. READ YOUR MANUAL FIRST as the hole is not in the same place for all ROM versions.
From: Marck on 21 Jan 2010 14:57 On 21/01/2010 18:52, Han wrote: > Underneath one of the four rubber feet is a reset hole that you can > try. READ YOUR MANUAL FIRST as the hole is not in the same place for > all ROM versions. thanks a lot, there's a hole underneath each of the 4 rubber feet and the manual doesn't tell everything about a reset button... i tried to "press" in every hole but I didn't feel anything like a button "click" inside, only a hard surface... I tried the reset memory command described in the manual (ON+A+F buttons pressed together) and also tried to change the AAA batteries with new ones but still nothing seems to happen, the screen is always off.. :-( Any more suggestions? Marck
From: Yann on 21 Jan 2010 16:06 Looks electrical. Maybe you can't avoid opening your HP48sx case (follow instructions to do it without damage) you may end up discovering a simple connection issue between battery lanes and the board to power.
From: John H Meyers on 21 Jan 2010 17:24
On Thu, 21 Jan 2010 13:57:18 -0600, Marck wrote: > there's a hole underneath each of the 4 rubber feet and > the manual doesn't tell everything about a reset button.. > i tried to "press" in every hole but I didn't feel anything > like a button "click" inside, only a hard surface... There is nothing so fancy as a "button" in the HP48[S/G] series; the "reset switch" contact in my 48G is made between a bent piece of thin shielding and the circuit board, when a paper clip pushes part of the shielding towards the circuit board, and then hits the board. Best to use as thick a paper clip as can fit into the hole. Postings about resetting a 48S[X] (or sometimes 48G[X]): http://groups.google.com/group/comp.sys.hp48/msg/d3c69db4f936720c http://groups.google.com/group/comp.sys.hp48/browse_thread/thread/e14d7ca65ac5a58 By Dave Arnett (HP electrical engineer on HP48 series): http://groups.google.com/group/comp.sys.hp48/browse_thread/thread/c294d11b77c5b804 DO NOT REVERSE THE BATTERIES (that was NOT Dave speaking!) -- |