Laser Unit Test Pattern Print (Function Code 68) - Brother HL-4140CN Service Manual

1.4.14 Laser unit test pattern print (Function code 68)

<Function>
This function allows you to print the laser unit test patterns and check if there is any failure in
the laser unit.
<Operating procedure>
(1) Press the
the maintenance mode. Then, press the OK button. "PRINTING" is displayed on the
LCD, and one laser unit test pattern (refer to the figure below) is printed.
Note:
When printing fails, a relevant error is displayed on the LCD. When the error factors
are removed and the Go button is pressed, the printer automatically recovers to the re-
executable state. "PRINTING" is displayed on the LCD, and the laser unit test
pattern is printed on a sheet.
(2) When this operation is completed without an error, "SCANNER CHECK" is displayed on the LCD.
(3) Press the Cancel button to return to the printer to the initial state of the maintenance mode.
When an error message is displayed on the LCD, take the measures described in the table below.
Error message
TONER EMPTY # *
Cover is Open
No Paper
Jam Tray1
Jam Rear
* # indicates the toner color (K, Y, M, or C) of which cartridge became empty.
■ Laser unit test pattern
or button to display "MAINTENANCE 68" on the LCD in the initial state of
Replace the empty toner cartridge and press the Go button
to clear the error.
Close the front cover.
Replenish paper of the A4-size paper specified in the display
on the tray. Press the Go button to clear the error.
Remove the jammed paper, and press the Go button to clear
the error.
Fig. 5-10
5-28
Measure
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