HP 39gs Resetting Manual page 2

Hard reboot (with loss of memory)
To completely reset the calculator's memory back to factory settings press
SK1
( ="screen key 1") When doing this, don't press them all at once; hold down the
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
ON
then . 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
2. My past experience with these calculators is that they do tend to
3. Pressing
Locked Calculator? Won't turn on? Turns on briefly and then immediately off?
Try the following:
• Try a soft reboot using
• 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?
ON
Try and
repeatedly.)
ON
Use and
• 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.
SK1
then try the procedures listed below this tip.
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.
by mistake will
ON+SK4
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
+ .
to make the screen darker. (Hold down
to lighten the screen.
SK6
and together - release
.
ON+SK3
ON
and press
ON+SK1+SK6
.
ON
SK6 SK1
, then ,