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Chapter 19 Troubleshooting
Problem 1:
Low reading efficiency.
Probable cause
A target code is not within the scan range of the
reading window.
The code may be smeared.
The code may be blurred.
Problem 2:
Cannot read 2D codes or bar codes.
Probable cause
The type of the code to be scanned has not been set as
a readable code.
The scanned bar code contains no check digit, while
the "Enable, with a check digit" parameter is selected.
The check digit contained in the scanned bar code is
wrong.
Problem 3:
Code data cannot be displayed normally on the computer screen. (USB-COM interface)
Probable cause
The communications conditions of the scanner are
different from those of the connected host.
Any device driver other than our Active USB-COM
port driver may be used.
Problem 4:
Code data cannot be displayed normally on the computer screen. (USB keyboard interface)
Probable cause
The keyboard type selected may not match one that is
set up in the host computer.
The Caps Lock state selected may not match that of the
connected keyboard.
Any device driver other than the system-supplied
driver (USB device class driver for HID) may be used.
The computer's keyboard may be held down.
What to do:
Bring a code within the scan range.
Wipe off the dirt from the code.
Use a code clearly printed.
What to do:
Enable the type of the code to be scanned as a readable
code.
Select the "Enable, without a check digit" parameter.
Use a correct bar code.
What to do:
Change the communications conditions of the scanner to
match those of the connected host.
Use our Active USB-COM port driver that is designed
for the USB-COM interface.
What to do:
Select the same keyboard type as one that is set up in the
host computer.
(You can check the computer's keyboard type by
clicking My Computer | Control Panel | Keyboard |
Hardware.)
Select the same Caps Lock state as that of the connected
keyboard.
Use the system-supplied driver.
Do not press the computer's keyboard when scanning
codes.
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