Omron NT31 Operation Manuals page 634

Troubleshooting
NT31/NT31C Symptoms
The System Menu cannot
be called up.
The following System
Menu operations are not
possible.
- Establishing the
Transmit mode
- Displaying the memory - Displaying the memory
switch setting screens
- Screen data memory
check
- Displaying the
initialization menu
- Displaying the
calendar/time setting
screen
Cannot input numeric
values
Cannot input numeric
values/character strings.
Window screen does not
open
Cannot switch screens
with touch switches
The display is dim.
The display is too faint.
Cause
"Display System Menu" under
"Change System Settings" in the
System Installer mode is set to
"Disabled".
"Screen Memory Protect" under
"Change System Setting" in the
System Installer mode is set to
"Disabled".
"Screen Memory Protect" has been
set to "Disabled" because the PT
power supply was turned OFF during
deletion of screen data.
The upper/lower (max./min.) limit
check for numeric value input is in
effect.
Bit 5 of the PT status control area
(numeral/character string input) is set
to "1" (ON).
Bit 6 of the PT status control area
(PT window opening) is set to "1"
(ON).
Bit 4 of the PT status control area
(PT screen switching) is set to "1"
(ON).
Insufficient contrast or brightness
Backlight defective, or its life has
expired
The contrast is too high.
Remedy
In the System Installer mode, set "Display System
Menu" to "Enabled" (page 169).
In the System Installer mode, set "Screen Memory
Protect" to "Enabled" (page 169).
Do not turn the PT power OFF during deletion of
screen data.
In the System Installer mode, first change the setting
for "Screen Memory Protect" to "Enabled", then
repeat the screen data delete operation (pages 169
and 170)
Check the screen data's upper/lower (max./min.) limit
check setting for numeric value input, and correct it if
necessary (for numeric key type, refer to page 424; for
thumbwheel type, refer to page 431).
Set bit 5 to "0" (OFF) (page 274).
Set bit 6 to "0" (OFF) (page 274).
Set bit 4 to "0" (OFF) (page 274).
Increase the contrast/brightness (pages 212 and 213).
Replace the backlight (page 632).
Reduce the contrast (page 212).
Section 11-1
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