Brother HL-4140CN Service Manual page 371

Color laser printer

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To avoid problems caused by the worn-out of the developer roller surface and deterioration of

the toner ceiling, "Replace Toner" message is displayed and the print operation is prohibited

when the number of the rotations of the developer roller reaches the upper limit even if toner

remains. The upper limit of the number of the rotations of the developer roller is shown in the

table below. Due to the specification change of detecting standard of "Replace Toner", the

upper limit differs depending on the version of main firmware.

(1) Main Ver. from Master to Ver. 1.15

Toner cartridge

(2) Main Ver.1.17 or later

Toner cartridge

Upper limit of rotations of the developer roller

Upper limit of rotations of the developer roller

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Troubleshooting