Hard reboot (with loss of memory)
To completely reset the calculator’s memory back to factory settings press
ON+SK1+SK6.
(
SK1=”screen key 1”) When doing this, don’t press them all at once; hold down the ON
key and, while still holding it down, press the first and then the last screen keys. Release
them in the opposite order. Don't release
SK1 and SK6 together - release SK6, then SK1,
then
ON. This is deliberately made complex so that it won’t happen by accident!
This type of reset will always cause complete loss of data. If you find that the screen fills
with garbage, or if the calculator’s in-built diagnostic routine starts to run, then it is just
that you have not released them in the right order. Simply try again.
Calculator Tip
1. If your calculator is really thoroughly locked up or won’t turn on
then try the procedures listed below this tip.
2. My past experience with these calculators is that they do tend to
lock up occasionally, particularly if you load aplets and programs
from the web. I usually suggest to my students that they regularly
save their work to a PC and perform a hard reboot about once a
month, reloading the saved work onto the calculator afterwards.
3. Pressing ON+SK4 by mistake will
result in the screen shown right.
This is a special diagnostic mode
that can be used by engineers to
test the calculator’s components.
There is nothing wrong with
experimenting with it but it is of no use to the average user. To exit,
simply reboot normally by pressing ON+SK3.
Locked Calculator? Won't turn on? Turns on briefly and then immediately off?
Try the following:
• Try a soft reboot using
ON+SK3.
• Try a paperclip in the hole in the back (gently).
• Is it possible that the screen is blank because the contrast is turned to extremely
light?
Try
ON and to make the screen darker. (Hold down ON and press
repeatedly.)
Use
ON and to lighten the screen.
• Change the batteries for new ones. Try this more than once because sometimes
batteries are dead right off the shelf if they've been in the shop too long. Try
replacing the backup battery too. Make SURE you’ve put the batteries in right
way around. Putting them in reversed may seriously damage the calculator.
Extracted from “Mastering the hp 39gs & hp 40gs Graphical Calculators” copyright © 2006 Applications in Mathematics & Hewlett
Packard. Permission is granted for use in education and for owners of HP calculators but not for commercial use.
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