I have a problem that whenever ili2500 1000 copy after copy of messages on the display comes on the display that the machine does not have to put the toner and toner but the bottle is full. Copies of many faint. After that, go into service mode and true copies forsed toner is great and getting a good copy.after 2500 or 3000 again appears that there is no tone. I changed the developer, but my problem is back> Please help me what the problem is. Thank you

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