Introduction
Having issues with your KBS3 keyboard then you should go through this guide to help diagnose any issues.
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Make sure the keyboard is powered, if none of the lights are on then check the cable between the dvr and the keyboard.
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if the cables are plugged in correctly and it is still not working then try using a different 485-bus port and if that did not fix the issue then either the keyboard, cable or the dvr are at fault.
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Replacement keyboards are on ebay for about £30-40 they are used but most of them work just fine.
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Almost done!
Finish Line