Fix a display with graphics errors

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Description

Recently it has come to our attention that in very rare cases the handheld display exhibits graphics errors similar to those shown in the picture below.

Display Graphics Error.png

It appears that the images read from the SD card got corrupted.

Solution

To fix a scrambled display, the microSD card inside the display ideally needs to be formatted prior to writing new files to the card.

  1. Power on the robot electronics and check the version number that appears on the status page on the top right.
  2. Disconnect the robot/control electronics from power.
  3. Loosen the cable gland a couple fo turns. There is no need to remove it completely.
    • Sdcard cable gland.jpg
  4. Remove the rubber sleeve from the handheld display, if your display has one.
    • Sdcard rubber sleeve.jpg
  5. Now there are 4 screws (Phillips head) accessible. Remove these screws to open the display.
    • Sdcard screws.jpg
  6. Open the display without putting undue stress on the cable coming from the outside.
  7. Locate and remove the microSD card.
    • Sdcard sdcard.jpg
  8. Many laptops have SD card readers built in these days. Put the SD card into your laptop/PC and format it FAT16 (the display cannot read FAT32 at all). In Windows 10 FAT16 is simply called FAT. Be very careful not to format the wrong drive by accident as this would cause data loss on your computer!
    • Right click on the SD card. Note your SDcard may have a different name.
    • Select FAT or FAT16 from the drop-down list and click start.
  9. Copy the individual files that you have unzipped earlier to the SD card.
    • Copy the files to your empty SD card.
  10. Safely remove the SD card from the PC, put it back into the display and reassemble the display in reverse order and power on the control electronics/robot.
    • SDcard safely remove.png
  11. The graphics should display ok now. If you find that the icons are not longer scrambled but you see overlaying icons, it is likely that you have downloaded the wrong zip file in the first step.