Brother International MFC 8890DW Service Manual - Page 404
Sensor Operational Check (Function code 32), <Function>, <Operating Procedure>, Start
UPC - 012502622673
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4.10 Sensor Operational Check (Function code 32) This function allows you to check whether the 20 sensors work correctly. (1) Press the [3] and [2] keys in this order in the initial stage of the maintenance mode. The machine beeps 1100 Hz and 400 Hz tones cyclically through the following volumes for testing the speaker. To stop beeping, press the [OK] button. 400 Hz Low Medium High OFF OFF 1100 Hz Low Medium High If the sensing status are as listed below, the LCD will show the following: "C1P1C2P2T2T3BC**", "TNMPNTRMRSPOCV" and "DFDRDLDSFCFH****" (which can be switched by pressing the [Start] button for machines.) Given below is the relationship among the LCD indication, sensor names and sensor status. LCD Sensors Sensing status C1 Tray1 sensor P1 Tray1 paper sensor C2 Tray2 sensor P2 Tray2 paper sensor T2 Tray2 connect sensor T3 Tray3 connect sensor BC Back cover sensor (Used for both standard tray andduplex tray.) Tray installed. Recording paper detected. Tray installed. Recording paper detected. Tray2 connected. Tray3 connected. Back cover detected. (Tray detected.) TN Toner sensor MP Multi-purpose tray sensor NT New toner sensor RM Front registration sensor RS Rear registration sensor PO Paper ejection sensor CV Front cover sensor Toner detected. Recording paper detected. New toner detected. No paper detected. No paper detected. No paper detected. Front cover detective. DF Document front sensor No document detected. DR Document rear sensor No document detected. DL ADF document separation sensor/Size sensor Document detected. DS ADF document SB sensor No document detected. FC FB cover sensor Document cover closed. FH Document scanner home position sensor CCD unit home position detected. (2) Change the detecting conditions to check that the indication on the LCD changes according to the sensor states. For instance, insert paper through the document front (or rear) sensor or the registration sensor (s), open the front cover or the document cover, remove the toner cartridge, jam paper at the paper outlet, insert paper from the manual feeder, and load a recording paper tray, etc. 7-17 Confidential