02-02-2011 04:29 AM - last edited on 01-05-2014 10:00 PM by maikoro
Our company purchased a couple of HP ProBook 6550b machines and we are very happy with them.
I have a weird issue concerning NumLock however: if we type & hold the 4 numbers 0,1,2 and 3; numlock gets disabled and vice versa.
This is very ennoying because all our current product id's in our LOB start with these numbers ! Our IT dep says we should attach an external keyboard to fix the issue, but our superior says no way. Anyone else has the same problem and perhaps solution?
P.S. This thread has been moevd from Archived Desktops and Workstations Boards > Windows based to Notebook - HP ProBook, EliteBook, Compaq, Slate/Tablet PC, Armada, LTE. - Hp forum Moderator
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02-03-2011 03:52 AM
You probably can do this with even less keys pressed.
Almost all keyboards work with a matrix, in wich a key connects a row with a column.
This saves "wires" within the keyboard.
the electronics in the keyboard puts a signal on a row and scans the colums to see if the signal occurs there.
lets say you'v got rows 1-9, columns A-F
and lets say the numlock connects row-3 with column-C
- key-"0" that connect column-D with row-3
- key-"1" that connect column-D with row-4
- key-"3" that connect column-C with row-4
if you press "0", "1" and "3" together
a connection is made between row-3 and column-C (through row-4 and column-D)
The electronics detects this connection as "numlock-key".
Offcourse the electronics can be changed to overcome this problem, but it is easier to instruct your emplyoees not to do this weird behaviour.
If every key has a dedicated connection to the electronics, then this ghost-key detection cannot happen. but his keyboard design needs more "cabling"
02-03-2011 12:59 PM
in your opinion, if i log a call to hp support about this, is there a chance they can solve this with a patch?
02-04-2011 12:22 AM
It is not likely HP will do that.
It's not something that only goes for the ProBoook 6550b.
All PC-keyboards use this mattrix setup, and will have a combination of key's pressed that will detect a "wrong" key.
(the place of keys in the matrix may differ).
>>> This is very ennoying because all our current product id's in our LOB start with these numbers !?<<<
That is be no reason to press 4 keys simultanouously is it?
If all your numbers in this field start with the same number you could consider making this a fixed prefix in this entry-field.