HP 21 not powering on - repair/troubleshooting advice
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01-28-2021, 03:01 PM
(This post was last modified: 01-28-2021 03:51 PM by aurelio.)
Post: #15
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RE: HP 21 not powering on - repair/troubleshooting advice
(01-27-2021 11:44 PM)dmh Wrote:I would avoid dipping this part if you have not removed the keyboard first. If it shows signs of corrosion then clean it too, but with a sponge. To remove the keyboard you have to cut the plastic rivets and therefore you need extra work to restore them.... remove the keyboard only if there are false contacts and you have to clean (with a thin sheet of paper) ... if you browse the forum in another discussion it is explained how to do in detail. If I've undersood the issue (do not power up at all) and you see traces of green on the printed board simply try to do the first step (this way you also clean the battery contacts). if the calculator power on now, can go ahead, checking the rest(01-27-2021 09:41 AM)aurelio Wrote: Don't worry: the bath is a well-established procedure, especially for this type of machines... Have fun |
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