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19
TROUBLESHOOTING GUIDE
The following guide is for reference purposes only. Contact a Metrologic
representative at 1-800-ID-METRO or 1-800-436-3876 to preserve the limited
warranty terms on page 20.
SYMPTOMS POSSIBLE CAUSE(S) SOLUTION
No LEDs, beep and
there is no visible laser
No Power is being
supplied to the
scanner
Make sure the cable is
plugged into the host.
Check the host system’s
power cable, the outlet and
power strip.
No LEDs, beep and
there is no visible laser
No power is being
supplied from the
USB port.
The IS4220 requests
100mA from the USB port.
If the USB port cannot
supply this, a notification
window will appear on the
screen.
After scanning a bar
code, the Red and
Green LEDs are on,
but no data is being
transmitted to the host.
The scanner is not
programmed properly
for communication
with the host.
Re-program the scanner
using the appropriate codes
for your scanner model.
USB Keyboard Emulation
After scanning a bar
code, the scanner
beeps, but the
characters appear
incorrectly in your
application.
The scanner is not
programmed
correctly.
The incorrect country
has been selected.
Re-program the scanner
using the appropriate codes
for your scanner model.
The scanner powers
up, but does not scan
and/or beep.
The scanner is trying
to scan a particular
bar code symbology
that is not enabled
Verify that the type of bar
code being read is
enabled.