Basic Adjustments - Brother S-7300A Service Manual

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7-5-4

Basic adjustments

7-5-4-1. Adjusting the feed dog height
(1)
Becomes
higher
Becomes
lower
Becomes
higher
Standard
Becomes
lower
1.
Turn on the power.
2.
Start backtack sewing, best PFM mode, slow start,
special locus and X-over seam assist will turn off.
3.
Set the feed pitch to 3 mm (for -[][]3 specifications) or to 5
mm (for -[][]5 specifications). (Refer to "5-4-3. Main
sewing settings" in the Instruction Manual.)
4.
Press the menu key (1).
5.
Check the clearance A when the feed dog (2) is at the
furthest forward position.
-[][]3 specifications: 0.5 mm
-[][]5 specifications: 3 mm
*
<-[][]3>
0.8mm
<-[][]5>
1.2mm
0929D
6.
Turn the machine pulley to move the feed dog (2) to its
highest position above the needle plate.
7.
Tilt back the machine head.
8.
Loosen the set screw (3).
9.
Turn the feed lifting rock bracket stud (4) within a range of
90° from the reference line (5) to adjust the vertical height
of the feed bar (6). (Fig. A)
10.
*
0916D
Becomes
higher
Needle plate
Standard
Becomes
lower
0930D
S-7300A
The standard height of the feed dog (2) when it is raised
as far as possible above the surface of the needle plate
is 0.8 mm (for -[][]3 specifications) or 1.2 mm (for -[][]5
specifications).
Tighten the set screw (3).
If you are worried about the angle of the feed dog (2),
turn the shaft (7) while carrying out the above adjustment.
(Fig. (B)) (Refer to "7-5-4-2. Adjusting the feed dog angle"
on the nextpage for details of this operation.)
7. ADJUSTMENTS
Becomes
higher
Standard
Becomes
lower
0931D
122