Yamaha AvantGard N3 Maintenance Handbook page 37

(5) Remove parts
5-1 Remove the top board.
5-2 Remove the front board.
5-3 Remove the left and right arm upper.
(6) Adjust damper holder up/down position
6-1 Loosen the screw marked [S09] and the screw marked
[S16] holding the damper holder to the arm. (Fig. 3)
<Top view>
DAMPER
HOLDER
SPACER
DAMPER
HOLDER
[S16]
KEY
BLOCK
ARM
RUBBER BUTTON
KEY
BLOCK
RUBBER
DAMPER
BUTTON
HOLDER
[S09]
ARM
<Section A-A>
(7) Key cover front/rear position within standard?
(Check the left and right end.)
Standard 1 Make sure that with the key cover opened the
gap between the back of the black keys and the
front surface of the key cover is within standard.
(Fig. 4)
(Reference)
Standard value B (at shipment):
3.3 mm +1.7 mm/-1.3 mm, difference on the
left and right within 1 mm (Fig. 4)
A
A
DAMPER
HOLDER
SPACER
6-2 Adjust the key cover height to the height standard given
in (4) by changing the number of damper holder spacers
below the damper holders as needed. (Fig. 3)
6-3 Tighten the two (2) screws holding the damper holder.
(Fig. 3)
* If necessary, the adjustment can be performed by
not only loosening but also removing the screws
holding the damper holder from the inside of the arm,
however, this is not recommended as it will most likely
require new pilot holes. If removal cannot be avoided
and tightening of the screws is not possible in step
"6-3", follow the instructions in section "Adjustment
procedure by replacing damper holder".
<Section B-B>
Fig. 3
Standard 2 Make sure that with the key cover closed the
difference in level between the front surface of
the arm and the front of the key cover is within
the standard (especially the difference on the left
and right). (Fig. 5)
(Reference)
Standard value C (at shipment):
3.2 mm ±2 mm, difference on the left and right
within 2 mm (Fig. 5)
B
DAMPER
HOLDER
SPACER
DAMPER
HOLDER
[S16]
KEY
BLOCK
ARM
B
RUBBER BUTTON
DAMPER
HOLDER
SPACER
RUBBER
DAMPER BUTTON
HOLDER
[S09]
ARM
N1
KEY
BLOCK
37