Question about Zebra LS4278 Cordless Bar Code Reader Barcode Scanner

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I have a symbol LS4278 scan gun. When I place the gun in the cradle it blinks with an amber light. In the documentation that says that it has a "Critical battery temperature fault". I replaced the battery with a new one but it still does the same thing. Could it be that the cradle is no good, or maybe a problem with the scanner itself? Thank You.

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Hello Lynda,
this seems to be an error with the charging system of the scanner. As you stated the error occurs also with other battery. Just check if the scanner is in warranty and send it for repair.
It could work also with this error, but the charging will not work correctly. As the temperature error is safety measure which stops the charging until the status get changed.

Posted on Sep 08, 2010

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Posted on Jan 02, 2017

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My canner ls4278 is making a sound and turnin red when i scan


It could be the scanner is not paired to the cradle. The scanner will be once for the barcode and then four times for the communication error. Make sure the cradle has power; it will pull power from a USB port. Scan the pairing barcode on top of the cradle. The scanner will give a high low high low beep and then shortly after give a short low short high beep indicating the radios have paired. If the scanner still beeps four times after doing this, the host type may not be set. If connecting USB scan HID Keyboard from the LS4278 Product Reference Guide.

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There are three possibilities I can think of assuming this is not a brand new scanner:

1. The LS4278 is faulty - which given Symbols quality I would say it is normally not the case unless th scanner has been dropped or otherwise damaged.

2. The cradle is not charging the scanner. You may wish to try another cradle - one that you know is charging aother scanner. After a few minutes you should be able to see the laser.

3. The battery in the scanner either needs a recondition (see product reference guide), or needs replacement.

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The most unlikely scenario is that all the bases are defective. If you power your PC off every night, you should purchase a power supply so the scanners can continuously charge. Another issue may be that you need new batteries (also unlikely if they stopped working at the same time). Also try swapping scanners and bases (one scanner from one base and place it with another base) make sure you firmly place the bottom of the scanner in the base to verify there is a good connection with the charging pins. We are here to help if you have further questions.
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I was also unable to find a solution for you. There are only supposed to be 2-leds in the cradle, 1-green and 1-amber. Maybe it is a battery temp fault, and it has somehow been misread. If you have another docking station and another gun, try swapping them to see where the fault lies. If on the good station the gun shows the same error, you know the fault it with the gun, not the cradle. Hope this has helped!

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1 Answer

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Hi, try scanning French Windows barcode from the USB section of the LS4278 Product Reference Guide. The barcode is on Adobe page 147 of 414. You may also have to scan the Enable Keypad Emulation barcode from Adobe page 150 of 414, but I would do this only after testing with the French Windows setting first. I suggest saving a copy of the document before printing the barcodes just to make it easier to print. Hopefully this will resolve the issue.

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If the scanner does not start working immediately you should reboot your computer.

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1 Answer

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Hi, I would be happy to assist you in resetting your LS4278, but it would be helpful to know how you are connected. The Set Defaults barcode will reset all of the scanner settings, but it will also cause you to lose the "pair" (communications) between the scanner and cradle. If you try scanning a barcode at this point you will receive a single beep followed by four error beeps. This just means the scanner is not talking to the cradle. Scan the barcode on top of the cradle. The scanner should give a high low high low series of beeps followed by a short low short high. The short low short high indicates the scanner is talking to the cradle again and you are ready to scan.

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Samsung battery


Green:Fully charged
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Red:Charging

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