Troubleshooting chart – Rockwell Automation 2755 AdaptaScan Bar Code Readers User Manual

Page 67

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Troubleshooting and Maintenance

6–2

Table 6.A
Troubleshooting Chart

Problem

Probable Cause(s)

Corrective Action(s)

Reader does not power up. No LED indicators
illuminate.

1. Improper connection to power source.

2. Power source not providing 12 to 28

VDC.

1. Check power source.

2. Check for green LED in wiring base.

3. Check the wiring base connector for bent

pins.

No communications with personal computer.

1. Communications fault.

2. No power supply connection at

DeviceNet connector

3. Computer fault.

4. Broken or bent pins on Configuration Port

of Reader

1. Check cable connection.

2. Power must be supplied. See Chapter 3.

3. Refer to computer user manual.

4. Check Configuration Port of Reader for

damaged pins. If pins are damaged, re-
turn Reader.

No laser beam emits from scan window.

1. No laser light trigger signal.

1. Verify Reader Laser Light trigger source

for proper configuration and operation.

Unable to read a label.

1. A label has not been defined.

2. Decoding functions not configured

correctly.

3. Label(s) out of specification.

4. Scan line not on the label.

5. Reader is at incorrect angle or distance

from bar code symbols.

1. Define a label and symbol.

2. Check decoder configuration to verify that

parameters are set appropriately for your
application. After making changes, SEND
the configuration and try again.

3. Use good quality labels that are within

specifications.

4. Reposition the scan line.

5. Use autofocus to adjust the read range.

Use the ON SYMBOL LED to verify that
the Reader is scanning a possible bar
code symbol.

No communications with host.

1. Baud rates not set properly.

2. Loose or incorrect wiring.

3. Broken or bent pins on 24-pin Reader

connector.

4. Reader DeviceNet address or DH485

node and maximum node are not set
properly.

5. Termination switch not set properly.

1. Verify that Reader and host are set at the

same Baud rate.

2. Verify cable connections using connection

diagrams in Chapter 3.

3. Check Reader connector for broken or

bent pins.

4. Verify DeviceNet Address or DH485 node

number settings.

5. Check position of termination switch in

wiring base. Set to correct position.

No communications with network.