Rockwell Automation 2755 Enhanced Decoder Series B - Manual (Page 286)

17–4 Maintenance and Troubleshooting
Publication 2755-833
Problem: ”Laser On” indicators on both the decoder and
scanner light but the scanner does not emit the laser light.
Cause: Mechanical shutter on scanner closed (2755-L4/L5
scanners only).
Solution: Open shutter.
Cause: Scanner Laser On switch is in OFF position (2755-L7/L9
scanners only).
Solution: Turn on switch.
Cause: Cable connections between decoder and scanner are
loose or defective.
Solution: Check cable and connections.
Cause: Laser tube or diode burned out or defective.
Solution: Replace scanner.
Problem: Decoder ”Trigger Active” indicator will not light.
Cause: Wrong or improperly wired trigger source. (Decode
Mode is set to Triggered).
Solution: Verify that an appropriate package detector is properly
connected to the scanner. Most photoelectric package detectors
have a built-in LED. Verify operation of this package detect LED.
Some photoelectric switches have sensitivity adjustments. Check
adjustment.
Cause: Cable connections between decoder and scanner are
loose or defective.
Solution: Check cables and connections.
Problem: Decoder cannot read label.
Cause: Decoder not configured correctly.
Solution: Check decoder configuration to verify that parameters
are set appropriately for your application.
Cause: Loose cables or connections.
Solution: Check cables and connections.
Problem: Decoder cannot read label.
Cause: Scanner is at incorrect angle or distance from the bar
code.