Brother DCP6690CW Service Manual page 377

(18) To select the paper feed roller adjustment using paper tray #2, press the 1 key.
The "PFLT NO. +0" appears on the LCD.
(19) Perform the same operation as in step (8) and (9).
For the paper ejection roller adjustment using paper tray #2
No adjustment is needed. The adjustment values determined in steps (10) to (14) above
automatically apply.
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