Brother DCP-J4110DW Service Manual page 271

If the internal ring is already set in the +1 or -1 position and cannot be turned further,
then replace the head/carriage unit.
Note: When turning the internal ring, hold down the head/carriage unit. Failure to do so
may cause missing block.
Turning the rings

External ring
Apply the tip of a flat screwdriver to the groove at section "A" shown on the next page.
While pressing down the external ring with the screwdriver, turn it to the + or - position.
Internal ring
Insert the tip of a flat screwdriver under the external ring from section "B" and remove the
external ring upwards. Put the external ring on the internal ring inside out and use it as a
wrench to turn the internal ring to the + or - position.
External ring
Internal ring
4-17
(5_001_E)
Confidential