Rockwell Automation 2755 High Performance VLD Scanner - Manual (Page 44)

6–4 Maintenance and Troubleshooting
Problem: “Power” indicator lights but the laser beam is not on.
Cause: Decoder setup parameters are not set up
properly.
Solution: Verify decoder configuration.
Cause: Package detector not operating.
Solution: Verify decoder configuration / package
detect operation.
Cause: Laser scanning mechanism is not
operating correctly.
Solution: Return scanner to Allen-Bradley for
service.
Problem: Unable to read a label.
Cause: Decoder not configured correctly.
Solution: Check decoder configuration to verify that
parameters are set appropriately for your
application. After making changes, SAVE
configuration to EEPROM and restart
decoder.
Cause: Label(s) out of specification.
Solution: Use good quality labels that are within
specifications.
Cause: Scan window is dirty.
Solution: Clean window as described in previous
sections of this chapter.
Cause: Scanner is at incorrect angle or distance
from bar code symbols.
Solution: Check that the scanning distance is correct
and orientation of labels to scanner is
correct.
Determine the optimum reading angle by
using a static bar code label position and
checking the decoder performance
indicators with the Decode Mode set to
Continuous. Refer to ”Compensating
for Pitched Symbols”.
Fix the scanner at a position that results in
a high decoder performance value. After
properly positioning the scanner, return
the decoder configuration to the correct
operating mode.