Brother MFC9100C Service Manual page 119

(4) Fit the purge unit adjuster over the carriage rail as shown below.
NOTE: Take care not to scratch or damage the carriage rail.
(5) While pressing the knob to the rear, turn it counterclockwise (in the direction of arrow
order to clamp the purge unit adjuster to the top of the main frame.
(6) While pushing down the purge unit adjuster at section "X," fully tighten the purge unit screws.
(7) Remove the purge unit adjuster.
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