Topcon DL-501 Instruction Manual page 112

20. WARNING AND ERROR MESSAGES
The following cannot be used in a file id.
A file name containing "*", "?", or "/" is invalid. Create a file name which does not use any of these
characters.
Time out
The Auto Focus function could not read the staff, or Auto Focus could not complete within the time
specified. Check the staff is set up correctly and try again.
Too bright
Too bright. The brightness level suddenly altered during measurement.
Something is shining nearby or behind the staff.
Light is entering the eyepiece.
Use your hand or body to shield the eyepiece from the light source.
Too dark
Too dark. The brightness level suddenly altered during measurement.
USB files are read-only.
Data on the USB memory device is read only. Files cannot be deleted, changed, or overwritten.
USB memory device is write protected.
USB memory device is write protected. Data cannot be written to the USB memory device.
Cancel write protection or use a different device.
USB memory device not inserted.
No USB memory device inserted in the USB port.
Check that the USB memory device is inserted correctly.
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