97
Chapter 12 Troubleshooting
Problem 1: Low reading efficiency.
Probable cause
What to do:
•
A target code is not within the scan range of
the scanning window.
•
Bring a code within the scan range.
•
The code may be smeared.
•
Wipe off the dirt from the code.
•
The code may be blurred.
•
Use a code clearly printed.
Problem 2: Cannot read 2D codes or bar codes.
Probable cause
What to do:
•
The type of the code to be scanned has not
been set as a readable code.
•
Enable the type of the code to be scanned as a readable
code.
•
The scanned bar code contains no check digit,
while the "Enable, with a check digit"
parameter is selected.
•
Select the "Enable, without a check digit" parameter.
•
The check digit contained in the scanned bar
code is wrong.
•
Use a correct bar code.
Problem 3: Code data cannot be displayed normally on the computer screen. (USB-COM interface)
Probable cause
What to do:
•
The communications conditions of the scanner
are different from those of the connected host.
•
Change the communications conditions of the scanner to
match those of the connected host.
•
Any device driver other than our Active
USB-COM port driver may be used.
•
Use our Active USB-COM port driver that is designed for
the USB-COM interface.
Problem 4: Code data cannot be displayed normally on the computer screen.
(USB keyboard interface)
Probable cause
What to do:
•
The keyboard type selected may not match one
that is set up in the host computer.
•
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.)
•
The Caps Lock state selected may not match
that of the connected keyboard.
•
Select the same Caps Lock state as that of the connected
keyboard.
•
Any device driver other than the
system-supplied driver (USB device class
driver for HID) may be used.
•
Use the system-supplied driver.
•
The computer's keyboard may be held down.
•
Do not press the computer's keyboard when scanning
codes.
Summary of Contents for QK20-R
Page 1: ...2D Code Scanner Fixed type QK20 R QK20 U User s Manual...
Page 94: ...83 Header USB keyboard interface None default STX ETX CR LF CR LF TAB ESC ENTER Right Ctrl...
Page 95: ...84 Header USB keyboard interface...
Page 96: ...85 Terminator USB keyboard interface None STX ETX CR LF CR LF TAB ESC ENTER default Right Ctrl...
Page 120: ......
