Brother International HL-2400C Service Manual - Page 126
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5) Press the Continue button to implement SW TEST. The LEDs are all off, and then the following display appears. Check that the corresponding number appears when pressing the buttons on the control panel. XXXXXXXX Corresponding button number on the panel 12345678 1 2 3 45 6 7 8 6) Press the Continue button to implement the SENSOR TEST. The LEDs are all off, then the following display appears. sXXXXXXXXXXXXXXX XXXs ABCDEFGHIJKLMNOP QRST Check that the display of each sensor is changed to the corresponding character. s → (Open the cover) → (Remove the toner cartridge.) → (Close the cover and wait for 20 seconds.) → (Open the cover.) → (Install the toner cartridge.) → (Close the cover and wait for 20 seconds.) → 'D' Corresponding sensor code A: Front Cover B: Top Cover C: Rear Cover (Transfer Unit) D: Toner Cartridge (K) E: Toner Cartridge (C) F: Toner Cartridge (M) G: Toner Cartridge (Y) H: OPC Belt Cartridge I: Fuser Cleaner J: Fusing Unit K: Waste Toner L: Upper Cassette M: Lower Cassette N: Upper Cassette Paper O: Lower Cassette Paper P: Upper Cassette Media Q: Lower Cassette Media R: Paper Sensor 1 S: Paper Sensor 2 T Paper Sensor 3 Note: • Since the sensors respond only when the cover is closed, be sure to close the cover before re-installing any items. • The sensors tests, especially the OPC test, require time to respond on the LCD panel. Operate a sensor in one sense for at least 20 seconds before restoring it to the original condition for reliable operation of these tests. V-5