Troubleshooting

Occasionally a problem may occur with the NCR 7879. If this happens, check the following.

 

Note:  Other Topics are available at the end of this page.

 

Do This First

Perform the following before calling for service.

1. If there are Lights on, identify their meaning – Scan Advisor and Power Bar.
2. Verify that there is proper AC power supplied to the Power Supply, if included.
3. Reset the NCR 7879 by removing and then supplying power.
4. Verify that all cables are properly connected.
5. Verify that the Scan Windows are clean.
6. If the NCR 7879 includes a scale, verify that there are no obstructions to the Top Plate movement.
7. Set the scale to zero by touching the Scale Zero button.
8. Verify that the host terminal is functioning properly.

 

Scanner Problems

ClosedNo Lights On

Possible Cause / Corrective Action

Problem with Power Supply – if included with system

1. Check AC receptacle for having proper power.
2. Check Power Supply – Green light should be on.
3. Check Power Supply cable connections.
4. Call for service.

Problem receiving power from the host terminal – Power Supply not used

1. Check host terminal for being on.
2. Check communication cable connections.
3. Call for service.

 

ClosedReads Only 2 Labels

Possible Cause / Corrective Action

NCR 7879 is not communicating with host

1. Check communication cable connections.
2. Check host terminal for being turned on.
3. Check host terminal for proper operation.
4. Check for expected communication protocol.
5. Call for service.

 

ClosedDoes Not Read Any Labels

Possible Cause / Corrective Action

Internal Failure

1. Power cycle the scanner – Off then On.
2. See Power Bar if an error code is displayed.

Scanner disabled by host terminal

3. Verify Host Terminal is enabling scanner with transaction.
4. Call for service.

 

ClosedPoor Scanning Performance

Possible Cause / Corrective Action

Scanning outside of Scan Zone

1. Scan all items within the Scan Zone.

Poor tag contrast or quality

2. Scan closer to Scan Window.

Excessively dirty/scratched Horizontal Scan Window Glass

3. Clean the Horizontal Scan Window Glass.

Poor camera focus

4. Call for service.

 

ClosedData Not Sent To Host

Possible Cause / Corrective Action

Problems communicating with Host Terminal

1. Reset 7879 by scanning the Reset tag.
2. Check communications cable connections.
3. Check programming and correct as needed.
4. Call for service.

 

Scale Problems

ClosedRemote Scale Display Is Blank

Possible Cause / Corrective Action

Scale is under weight

1. Verify that the Top Plate is properly located on the NCR 7879.
2. Remove any debris and foreign objects from under the Top Plate.
3. Touch the Scale Zero button.

Top Plate is restricted from moving

4. Remove any foreign objects from around the Top Plate and Produce Guard.
5. Touch the Scale Zero button.

Power Supply problem

6. Turn the NCR 7879 off then on.

Remote Scale Display not working

7. Check Display Cable for being properly connected to the NCR 7879.
8. Replace the Remote Scale Display.

NCR 7879 is not programmed for a scale

9. Program the NCR 7879 for a scale – Program Mode, Hex 3, Hex 0, Hex 3, Save and Reset.
10. Call for service.

 

ClosedRemote Scale Displays – – – –

Possible Cause / Corrective Action

Too much weight on Top Plate

1. Remove items from Top Plate.
2. Remove any obstructions to the Top Plate movement.
3. Call for service.

 

ClosedScale Not Weighing Correctly

Possible Cause / Corrective Action

Scale is out of calibration

1. Touch the Scale Zero button.
2. Have the scale calibrated.

Component failure

3. Call for service.

 

Other Topics

User Information

Home Page

Scan Advisor

Identify specific Status indication

Power Bar

Identify specific Performance or Error indication

Programming Tags

Display Programming Tags Bar Codes