Troubleshooting Guide - Sharp EL-9900 Operation Manual

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 saved calculator configurations are not retained!
The power seems to be on, but the characters and numbers cannot be seen
clearly on the display!
The calculator won't take the minus (-) sign; calculation results in a syntax
error!
The calculation results are very different from what is usually expected!
The graph cannot be seen!
• The operation batteries may not be installed, may be ex-
hausted, 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.
• Both the lithium battery and the operation batteries may need to
be replaced.
• The screen contrast may need to be adjusted.
Press @ p, then press A to enter A CTRST; the
screen contrast can be adjusted by using the + or the
- key.
• To set a negative value, use the _ key instead of the -
key.
• The angle unit and other configurations may be incorrectly set.
Check the configuration under the @ ;.
• Check the zoom configuration. Try selecting the automatic zoom
tool, by pressing Z, then A 1.
• The graph line may be set differently; check the line configura-
tion under @ d menu.
• The calculator may not be set to display graphs. Check the "="
sign in Y= screen.
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