6-11SectionSystem Maintenance
159
Check if the screen data memory is functioning normally.
Reference: S In
the screen data memory check, a write test is performed on the screen data
memory.
Since all the screen data in the NT21 is lost in this
check, confirm that
the
data has been backed up at the NT Support T
ool or Memory Unit before
executing it.
S If
writing to the
screen data memory is disabled by the setting for System Set
-
tings
in
the System Installer mode, it is not possible to execute a screen data
check.
S Once a screen data check has been started, it cannot be stopped.
Follow the menu operations from the Device Check Menu as shown below.
Select Screen Memory.
Press Execute.
• During the check, the message Checking Now... is displayed.
• On normal completion of the check, the message Memory Check OK is dis-
played.
• If
an error is discovered in the check, the message Memory Check
NG is dis
-
played.
After
confirming the result of the check, press Quit. The NT21 returns to the DE
-
VICE CHECK MENU screen.
Screen Data Memory
Check
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