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(3) Replacing the timing belt
* The timing belt !1 (22505705) of the highest quality is used, and it is not necessary to replace it
unless a special trouble occurs.
1) Perform removing/installing of the motor in
accordance with the steps of 4. - (2)
Replacing the motor.
<<A-SS(-7), A-SU(-7), A-DS-7, A-DU-7>>
2) Tilt the sewing machine, remove back-
magnet setscrews 9 and remove back-
magnet !0.
3) Pressing timing belt !1 in the right-hand
direction, turn the timing belt to the front
by fingers, then the timing belt can be
removed.3) Pressing timing belt !1 in the
right-hand direction, turn timing belt !1 to
the front by fingers, then timing belt !1
can be removed.
4) Replace timing belt !1 with a new one and
install again by reversing the above order.
<<A-SR only>>
2) Tilt the sewing machine, remove feed stepping motor connector !2, and remove feed lever spring
!3 from the spring bracket.
* When removing feed lever spring !3, perform the work using a radio pincers or the like.
3) Loosen two setscrews !4 in the stepping motor link C and draw out feed link shaft !5 to the right-
hand side.
4) Remove three setscrews !6 in the feed stepping motor unit.
5) Similarly, perform the work as the aforementioned steps 3) and 4) of <<A-SS(7), A-SU(-7), A-DS-
7, A-DU-7>>.
Procedures of disassembling/assembling
9
!1
!0
Rubber
cushion
Plunger
!1
!2
!3
!4
!6
!4
!5
!6
!6
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