Brother DB2-DD7100, Service Manual

Page: 57 / 153

6. ASSEMBLY
SL-710A
50
6-18-1. Adjusting the presser foot height
The standard height for the presser foot (1) is 6 mm when
the presser foot (1) is raised by the presser bar lifter (2).
1. Raise the presser foot (1) using the presser bar lifter
(2).
2. Move the presser bar (3) up and down until the
presser foot (1) is 6 mm above the top of the needle
plate.
In addition, adjust so that the groove of the presser
foot (1) is parallel to the groove of the needle plate.
3. Tighten the bolt (4).
6-18-2. Adjusting the thread guide height
The standard height for the thread guide (5) is 121 mm
above the top of the bed when the presser foot (1) is
lowered.
1. Lower the presser foot (1).
2. Loosen the screw (6).
3. Adjust the position of the thread guide (5) so that it is
121 mm above the top of the bed, and then tighten the
screw (6).
6-18-3. Adjusting the tension
spring vertical position
The standard position for the tension spring (7) is 6 - 8
mm (4 - 6 mm for sub-class -[][]5) above the top of the
thread guide (5) when the presser foot is lowered.
1. Lower the presser foot.
2. Loosen the set screw (8).
3. Turn the thread tension bracket (9) to adjust the
position of the tension spring (7).
4. Tighten the set screw (8).
* Check the forward/back position of the thread tension
bracket (9) when tightening the set screw (8).
6-18-4. Adjusting the thread tension
bracket forward/back position
The correct forward/back position of the thread tension
bracket (9) is when the tension discs (10) start to open
when the presser foot is 4 mm above the needle plate.
1. Loosen the set screw (8).
2. Move the thread tension bracket (9) forward and back
to adjust so that the tension discs (10) start to open
when the presser foot rises to 4 mm above the needle
plate.
3. Tighten the set screw (8).
* Check the vertical position of the tension spring (7)
when tightening the set screw (8).
1782M
(1)
(4)
(3)
(2)
(1)
6 mm
Parallel
1781M
(10)
(9)
(11)
4 mm
1784M
0916M
(7)
(9)
(8)
(5)
< For sub-classes -[][]1 and -[][]3>
6 - 8 mm
< For sub-class -[][]5>
4 - 6mm
1783M
(6)
(5)
121 mm
(1)
(2)