Matrix Orbital VK204-25 Legacy - Manual (Page 17)

Figure 17: Protocol Select Jumpers
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 will fit on the Power/Data Connector and do have the
correct pin out as can be seen in figure 10 on page 8.
• The next step is to check the USB cable which you are using for continuity. If you don’t have an ohm
meter, try using a different USB cable, if this does not help try using a different power supply.
• The last step will be to check the USB Cable on the LK204-25-USB. If the USB Cable has become
loose, or you are unable to resolve the issue, please contact Matrix Orbital, see 14.5 on page 52 for
contact information.
3.2 The display module is not communicating.
• First, check the USB cable for continuity. If you don’t have an ohm meter, try using a different USB
cable. If you are using a PC try using a different USB Port.
• Second, 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.
• Finally, you may reset the display to it’s default settings using the Manual Override Jumper, see
Section 2.3 on page 9.
Matrix Orbital VK204-25-USB 13