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Chapter 14 Troubleshooting
Problem 1: Low reading efficiency.
Probable cause
•
A target bar code is not within the scan range of
the reading window.
•
The bar code may be smeared.
•
The bar code may be blurred.
Problem 2: Cannot read bar codes.
Probable cause
•
The type of the bar code to be scanned has not
been set as a readable code.
•
The scanned bar code contains no check digit,
while the "Enable, with C/D" parameter is
selected.
•
The check digit contained in the scanned bar code
is wrong.
•
The power saving function built in the computer
may be activated.
Problem 3:
Bar 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.
Problem 4:
Bar code data cannot be displayed normally on the computer screen.
(USB-COM interface)
Probable cause
•
Any device driver other than our USB-COM
device driver may be used.
•
Bring a bar code within the scan range.
(See Chapter 3.)
•
Wipe off the dirt from the bar code.
•
Use a bar code clearly printed.
•
Set the bar code type as a readable code.
(See Section 13.2.)
•
Select the "Enable, without C/D" parameter.
(See Section 13.2.)
•
Use a correct bar code.
•
Deactivate the power saving function.
•
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 that is included in
Windows 98 or later Operating Systems.
•
Do not press the computer's keyboard when scanning
bar codes.
•
Use our USB-COM device driver that is designed for
the USB-COM interface.
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What to do:
What to do:
What to do:
What to do:
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