Casio PV-750 Plus Technical Reference Manual page 17

Cause: 1. Light is not reaching the
infrared ports.
2. Surrounding light or
noise is causing
communication
problems.
Cause: An alarm time has been
reached for secret memory area data.
Check your home time setting and correct it if necessary!
Cause: This message appears after
an operation that can affect your
time settings.
Cause: An error occurred during
data communication.
Data error! Consult your User's Guide for correct procedure.
Cause: An internal data error has
corrupted memory data.
Data error! Do you want to view data before resetting?
Cause: A data error requires that
you perform the RESET operation,
which deletes all data stored in
memory and returns all settings to
their initial defaults.
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Cannot connect!
Action: 1. Remove the obstruction
Check the secret memory area!
Action: Enter the secret memory
area to view details about the alarm.
Action: Since all alarms and other
timekeeping related operations are
based on your time setting, be sure
to check it and make corrections as
necessary whenever this message
appears.
Communication error!
Action: Correct the cause of the
error and try again.
Action: See page 15 of this User's
Guide for the correct procedure.
Action: Tap Yes to close the dialog
box. You can then recall data stored
in memory to make written copies
before it is cleared by the RESET
operation. Tap No to go immediately
into to the RESET operation, which
will delete all data stored in memory.
that is blocking the light
and try again.
2. Change to a different
location, or change the
position of the phone,
and try again.