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CHAPTER 6 TROUBLESHOOTING
6-54
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;
Toner sensor
Button unpressed
Rear registration sensor
Front registration sensor
Upper paper cassette sensor
Drum
Ready
Alarm
Paper
Toner
Data
Fig. 6-12
Toner sensor ON (The toner cartridge is installed.) Drum LED ON
OFF (No toner cartridge is installed.) Drum LED OFF
Rear registration sensor ON (Paper is detected.) Ready LED ON
OFF (No paper is detected.) Ready LED OFF
Front registration sensor ON (Paper is detected.) Alarm LED ON
OFF (No paper is detected.) Alarm LED OFF
Upper paper cassette ON (No paper cassette is installed.) Data LED ON
sensor (HL-1250/1270N only) OFF (The paper cassette is installed.) 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.
Button pressed
Paper eject sensor
Cover sensor
Lower paper cassette registration sensor
Drum
Ready
Alarm
Paper
Toner
Data
Fig. 6-13
(HL-1250/1270N only)
(HL-1250/1270N only)