Sharp el-9950

231
Appendix
2. Troubleshooting Guide
Refertothelistofpossiblesymptoms,andsolutionsmaybefoundhere.
The calculator’s power won’t turn on!
• Theoperationbatteriesmaynotbeinstalled,maybeexhausted,
ormaybeinsertedincorrectly.Checktheoperationbatteriesin
the battery compartment.
• Placethebatterycoversecurelyorthecalculatorwillnotturnon.
The saved calculator configurations are not retained!
• Boththelithiumbatteryandtheoperationbatteriesmayneedto
be replaced.
The power seems to be on, but the characters and numbers cannot be seen
clearly on the display!
• Press
@
p
, then press
A
to enter A CTRST; the
screencontrastcanbeadjustedbyusingthe
+
or the
-
key.
The calculator won’t take the minus (-) sign; calculation results in a syntax error!
• Tosetanegativevalue,usethe
_
key instead of the
-
key.
The calculation results are very different from what is usually expected!
• Theangleunitandothercongurationsmaybeincorrectlyset.
Checkthecongurationunderthe
@
;
.
The graph cannot be seen!
• Checkthezoomconguration.Tryselectingtheautomaticzoom
tool, by pressing
Z
, then
A
1
.
• Thegraphlinemaybesetdifferently;checkthelineconguration
under
@
d
menu.
• Thecalculatormaynotbesettodisplaygraphs.Checkthe“=”
sign in Y= screen.
• Graphsdrawingsmaybeinterruptedinrarecaseswhen
equationsofGraphshavealistformat.