Re: HP 42S switches off immediately Message #5 Posted by Dave J on 28 Mar 2007, 10:47 p.m., in response to message #1 by bafana
Quote:
Hi I inherited a 42S and it switches off imediately after switching on. In some cases the display will flash for a split second, in other cases it doesn't show anything. If I press the ON key fast enough I can keep the display on until I release the key.
The self test (ON-LOG) works just fine, and passes OK. But at the end it just switches off. ON-ROOT (the reset function?) works and very briefly display "Machine Reset"
I can even adjust the contrast, and even get it to do calculations if I press a key fast enough at power on, but it switches back off again as before.
Anyone know what is wrong? Is there any higher level reset function I can try?
The batteries are brand new and tested.
Hey, that was my calculator on eBay, and your post is an identical one(cut'n'paste) to MY post on here a while back! :-P
If you are the guy that bought it from me then best of luck getting it fixed, all of the suggestions on this group and other groups did not fix the problem.
No it's not the capacitor(s), or other passive parts, it's not the batteries, and all the power-on reset and battery shorting tricks etc do not work.
If you do find a solution I'd be interested to know what it was.
Dave.
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