6 Troubleshooting
266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB | 73
Blank display screen
There are four approaches for troubleshooting the LCD. First, reset the display contrast to the default setting. Second, verify that
power is reaching the transmitter and that it has been correctly connected. Third, verify that the HMI connector is installed and
has not been damaged. Last, test component viability and potential need for replacement. The following procedures will address
the steps to eliminate a blank LCD.
Resetting display contrast
If the display screen is blank, the contrast adjustment may not be set in a viewable range. The setting range is between 0 and
100. The following procedure resets the display screen to the default setting of 50.
WARNING – Bodily injury. When the housing covers are removed and power is still connected, there is a
potential for explosion. Failure to observe this safety information may result in death or severe injury.
Do not remove housing covers in hazardous (classified) areas or explosive environments unless the area is
known to be non-hazardous. Verify an explosive atmosphere is not present before removing the housing covers
when power is live.
This procedure requires the transmitter to remain powered up.
1. Use the instructions in section 5.2.1 to remove the front housing cover, exposing the LCD assembly.
2. Press the right soft key and the left soft key simultaneously. This will reset the contrast to a default value of 50.
3. If the display has been restored, follow the instructions in section 5.2.2, Securing the housing cover, to secure the unit.
Otherwise, continue to the next step.
4. If the display is still blank, proceed to section 6.2.2, Verifying power connections.
IMPORTANT NOTE: If the display screen is dim, or the contrast too high for optimal visibility, go to section 5.8,
Adjusting the LCD screen contrast, to make additional adjustments before securing the housing covers.
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