User manual - A257_M256_UsersGuide
36
File Viewer Troubleshooting
Problem Cause and Required Action
File Viewer does not appear when I 
connect USB flash drive to the 
Data Projector’s USB-A port.
z The USB flash drive you are connecting may have a format that cannot be 
recognized by the Data Projector. Connect the USB flash drive to your 
computer to check if its file system is FAT or FAT32. If it isn’t, reformat the 
USB flash drive to FAT or FAT32. Note that doing so will delete all of the 
data currently in USB flash drive.
z If “Off” is selected for the “Option Settings 2 3 Plug and Play” setting 
(page 60), File Viewer will not startup automatically even if a USB flash 
drive is connected to the projector’s USB-A port. If this happens, change 
the “Plug and Play” setting to “On”.
Some folders and/or files are not 
displayed in the file menu.
All the folders and/or files contained in a folder will not be displayed if there 
are more than 999 folder and/or files inside the folder. If this happens, reduce 
the number of folders and/or files in the folder.
There are multiple devices 
connected to the Data Projector via 
a USB hub or USB card reader, but 
some of the devices are not 
recognized.
The Data Projector can recognize up to four drives. If the number of 
connected drives is greater than four, the Data Projector will not recognize 
the fifth and subsequent drives. Connect memory devices while ensuring that 
no more than four drives are connected.
When I connect my digital camera 
to the Data Projector via USB, 
digital camera memory contents do 
not appear.
z The digital camera’s USB mass storage class setting may not be 
configured correctly, or you may need to perform some operation on the 
camera. Consult the user documentation for your digital camera for 
information about the required settings and operations.
z The digital camera may not support USB mass storage class. If it does not, 
you will not be able to use Viewer to view digital camera memory contents.
On the Slide Mode file menu, 
question marks (?) appear in place 
of thumbnails.
Question marks are displayed in place of thumbnails of images that cannot 
be projected by File Viewer.










