Matrix Orbital GLK24064-25 Legacy - Manual (Page 17)

3 Troubleshooting
3.1 The display does not turn on when power is applied.
• First, you will want to make sure that you are using the correct power connector. Standard floppy
drive power cables from your PC power supply may fit on the Power/Data Connector however they do
not have the correct pin-out as can be seen in figure 9 on page 4. Matrix Orbital supplies power cable
adapters for connecting to a PC, which can be found in the Accessories Section on page 1.
• The next step is to check the power cable which you are using for continuity. If you don’t have an
ohm meter, try using a different power cable, if this does not help try using a different power supply.
• The last step will be to check the Power / Data Connector on the GLK24064-25. If the Power / Data
Connector has become loose, or you are unable to resolve the issue, please contact Matrix Orbital
see 15.6 on page 63 for contact information.
3.2 The display module is not communicating.
• First, check the communication cable for continuity. If you don’t have an ohm meter, try using a
different communication cable. If you are using a PC try using a different Com port.
• Second, please ensure that the display module is set to communicate on the protocol that you are
using, by checking the Protocol Select Jumpers. To change the protocol used by the display module
see Section 2.6 on the preceding page.
• Third, ensure that the host system and display module are both communicating on the same baud rate.
The default baud rate for the display module is 19200 bps.
• If you are communicating to the display via I 2 C please ensure that the data is being sent to the correct
address. The default slave address for the display module is 0x50.
NOTE I 2 C communication will always require pull up resistors.
• Finally, you may reset the display to it’s default settings using the Manual Override Jumper, see
Section 2.2 on page 7.
3.3 The display module is communicating, however text cannot
be displayed.
• The cause of this is often that no font has been loaded onto the display. To load a font onto the display
see Section 4.2.1 on page 16.
• Another common cause may be that the contrast settings have been set to low. The solution to this
problem is to adjust the contrast settings, the default setting that will work in most environments is
128.
NOTE Optimal contrast settings may varry according to factors such as temerature, view-
ing angle and lighting conditions.
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