Brother International HL 1240 Service Manual - Page 157

CHAPTER 6 TROUBLESHOOTING Factory inspection mode The factory inspection mode is used to check if the sensors in the printer are functioning correctly. In the process of this inspection, the LEDs and the control panel button are also checked. On entering this mode, the LEDs show the status of the respective sensors as shown in the figure below; Drum Ready Paper Alarm Toner Data Toner sensor Rear registration sensor Front registration sensor Upper paper cassette sensor (HL-1250 only) Button unpressed Fig. 6-12 Toner sensor ON (The toner cartridge is installed.) OFF (No toner cartridge is installed.) Rear registration ON (Paper is detected.) sensor OFF (No paper is detected.) Front registration ON (Paper is detected.) sensor OFF (No paper is detected.) Upper paper cassette ON (No paper cassette is installed.) sensor (HL-1250 only) OFF (The paper cassette is installed.) Drum LED ON Drum LED OFF Ready LED ON Ready LED OFF Alarm LED ON Alarm LED OFF Data LED ON Data LED OFF For checking more sensors, press the panel button. The LEDs show the status of the respective sensors as shown in the figure below. Drum Ready Paper Alarm Toner Data Paper eject sensor Lower paper cassette registration sensor (HL-1250 only) Cover sensor Button pressed Fig. 6-13 6-47