Needle Bar Rising And Needle Clearance - Brother PR655 Service Manual

Adjustment
[Standard]
The right edge of the needle matches up with the outer rotary hook point when
the needle bar is raised 1.8 to 2.2 mm from its lowest point.
And the clearance between the scarf of the needle and the outer rotary hook point
in the front/back direction should be 0 to 0.4 mm.
[Adjustment]
1. Remove the 2 screws of the needle plate to remove the needle plate.
2. Remove the screw 1 and screw 2 of the rotary hook stopper to remove the
rotary hook stopper.
1
2
3. Start the test mode and select [#11: Needle spacing] under [MAIN BOARD
TEST MODE].
4. Press the [Spacing position] and the standard needle bar for adjustment will be
selected automatically. The needle bar case unit will move to the left and right.
5. Turn the inner rotary by hand until it reaches a position (A) such that the
right edge of the needle and the outer rotary hook point look like they match
up with each other.
6. Hold the inner rotary and turn the pulley by hand to lower the needle bar to
its lowest point. Now slowly raise the needle bar until the number displayed
to the right of "Motor angle" reads 199.
*Key point
• The "Motor angle" will equal 199 when the needle bar is raised between 1.8 and 2.2 mm from its lowest point.
*CAUTION
• When rotating the pulley by hand be careful not to pierce your finger with either the outer rotary hook point or
the needle tip.
Needle
"A"
Outer rotary
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Needle bar rising and Needle clearance

Bolt, Socket
M3X6
Screw
2
Rotary hook stopper
1
with hex wrench 2.5 mm
Outer rotary hook point
Inner rotary
4 - 20
Needle bar rising
1.8 - 2.2 mm
Inner rotary Outer rotary