Brother MFC-J3520 Service Manual page 307

For initialization of adjustment values
(1) Press the 5 and 8 keys in this order in the initial stage of the maintenance mode.
The "Select 58?" appears on the LCD.
(2) Press the Mono Start key.
The "1. ALL" appears on the LCD.
(3) Press the 8, 9, 5, and 4 keys in this order.
The machine initializes all paper feeding correction values.
The "CLEAR PF & EXIT" and "1. ALL" appear.
Press the X key to return the machine to the initial stage of the maintenance mode.
 pfadj1 Pattern
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