Rockwell Automation 2755-L7, -L9 Scanners - Manual (Page 36)

Chapter 6
Maintenance and Troubleshooting
6–4
Problem Probable Cause Possible Solution
PWR ON indicators on
both scan head and
decoder do not light.
Decoder is not turned ON.
Improper connection to power supply.
Line fuse on decoder is blown.
Faulty power cord or switch.
No incoming power.
Turn decoder ON.
Reconnect power cord to source.
Replace fuse on decoder.
Check that voltage is present at service
outlet.
Check that voltage is present at service
outlet.
PWR ON indicator on
scan head does not light,
but PWR ON indicator on
decoder is lit.
Interconnect cable between decoder and
scan head is loose.
Interconnect cable is defective.
Scan head or decoder is defective.
Reconnect cable and check connections.
Replace cable.
Replace scan head.
No laser beam emitted
from window of scan head
Laser ON/OFF toggle switch is in OFF
position.
No scan trigger signal.
Check Laser ON/OFF toggle switch
position.
Verify sending of scan trigger by either
package detect or trigger from decoder.
Unable to read a label.
Improperly positioned labels.
Poor quality labels.
Laser ON/OFF toggle switch is in OFF
position.
Decoder is improperly programmed.
Loose cables or connections.
Scan Window is dirty
Check that reading distance is correct and
orientation of labels to scan head is correct.
Check that labels are good quality and
within specifications.
Check Laser ON/OFF toggle switch
position.
Refer to the appropriate User’s Manual.
Check cables and connections.
Clean window. Refer to Chapter 6
Laser beam expands and
contracts. Scan head is not securely mounted. Improve mounting.
Warning!
Laser beam is an intense
dot of light.
Laser scanning mechanism is not operating
correctly. Turn laser OFF using toggle switch on back
of scanner, then turn decoder OFF.
Troubleshooting the System