Brother MFC-P2000 - B/W Laser Printer Service Manual page 102

Paper eject ON (Paper is detected.)
sensor OFF (No paper is detected.)
Registration ON (Paper is detected.)
sensor OFF (No paper is detected.)
Cover ON (The top cover is closed.)
sensor OFF (The top cover is open.)
Toner empty ON (The toner cartridge is installed.)
sensor OFF (No toner cartridge is installed.)
The procedure for the factory inspection mode is as follows.
(1) Turn off the power switch of the printer, open the top cover, and remove the drum
unit.
(2) Turn on the power switch while holding down the printer control panel switch. The
Drum lamp comes ON.
(3) Lightly press the panel switch again.
(4) Check that the Drum (paper eject sensor) and Alarm (registration sensor)
lamps go OFF after all the lamps have been ON.
If the paper eject sensor is ON at this point, the Drum lamp stays ON (error).
If the registration sensor is ON at this point, the Alarm lamp stays ON (error).
(5) Install the drum unit.
Check that the Data lamp goes OFF.
(6) Lightly touch the registration sensor actuator.
Check that the Alarm lamp comes ON.
(7) Close the top cover.
Check that the Ready lamp goes OFF.
(8) Press the printer control panel switch.
(9) If all the sensors are correct, the printer goes back to the Ready status. If
any error is detected, the corresponding lamp stays ON.
Drum lamp ON
Drum lamp OFF
Alarm lamp ON
Alarm lamp OFF
Ready lamp OFF
Ready lamp ON
Data lamp OFF
Data lamp ON
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