Brother DCP-J552DW Service Manual page 224

(7) Adjust the head/carriage unit inclination by following the steps below.
When the block number with the least uneven printing in the first column configuration block
(top) is "0"
1) Check the block number with the smallest print unevenness in the second column
configuration block (center). Using a spanner, turn the external inclination adjuster knob
according to the checked number.
For example, when +1 block print unevenness is the smallest, turn the external inclination
adjuster knob one notch clockwise. If the smallest number is -1 block, turn the external
inclination adjuster knob one notch counter-clockwise.
2) After making adjustments, proceed to Step (8).
When the block number with the least uneven printing in the first column configuration block
(top) is not "0"
1) Check the block number with the smallest print unevenness in the first column
configuration block (top). Using an Allen wrench, turn the internal inclination adjuster
knob according to the checked number.
For example, when +1 block print unevenness is the smallest, turn the internal inclination
adjuster knob one notch clockwise. If the smallest number is -1 block, turn the inclination
adjuster knob one notch counter-clockwise.
2) Close the document scanner unit and print the test pattern for inclination adjustment again
in the same manner as Step (5).
3) Perform Chapter 5 "1.3.22 Move of the Head/Carriage Unit to the Adjustment Position,
and Check of the Pressure Roller Release Operation (Maintenance mode 63)"
head/carriage unit to an adjusted position. Open the document scanner unit.
4) Check the block number with the smallest print unevenness in the second column
configuration block (center). Using a spanner, turn the external inclination adjuster knob
according to the checked number.
For example, when +1 block print unevenness is the smallest, turn the external inclination
adjuster knob one notch clockwise. If the smallest number is -1 block, turn the external
inclination adjuster knob one notch counter-clockwise.
(8) Close the document scanner unit after adjustments.
The head/carriage unit will return to its home position.
Head/carriage unit
Head cover
Inclination adjuster knob
(external)
4-14
to move the
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