Fig. 6-12; Fig. 6-13; Factory inspection mode- Page 176

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)