Get another toner to fit to your new drum, what happens is the toner sits on the drum, and when you lock it on the drum it dumos as much powder from the toner container on top into the drum as it can. If the top unit runs entirly out of toner it will throw the sensor error, if you look at the drum you took out you will see it has the toner in it, so if you even just a put a new one in before you fitted the drum, you will need to fit another..
You can check if this is the issue by looking at the level of powder in drum unit, it should be up to the brim of foam edged slot not below it...then feel your toner if the top cart is empty then thats your issue ..fit another toner
There are other things but this is the most likly and I have given you a test to verify if this is your issue or not.. hope this helps oh and its a good idea not to change toner near drum life ends...or if you dont mind a little mess, before changing drum, invert your old one with toner still on top, while you are holding upside down , keep a firm pressure between both units and unlock the toner, turn upright and you now should have an near emppty old drum and the toner locked back in the toner cartridge ready to transfer its load to the new drum, rather than the expensive stuff heading for the bin......must be money in selling the stuff they want you to waste it....what a planet..cheers.
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