Yamaha AvantGard N2 Maintenance Handbook - Page 30

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N3, N2

N3, N2 KEY COVER ASSEMBLY-REPLACEMENT PROCEDURE

1. Required items for task

Service person shall possess the skill needed to replace the key cover in a grand piano.

2. Required parts

The task requires the usual tools, the key cover assembly (ZE082500), key cover adjuster part sets (ZE082600).

The following parts are included in the key cover adjuster part sets (ZE082600).

• Damper spacers A and B

• Rotation jig L/R (+1.0 mm, +2.0 mm)

• Music rest spacers

• Music shelf spacers

• Fall board rubber buttons (H=3.5/4.5/5.5 mm)

• Key block felt A (t=1.0/1.5/2.0 mm)

• Key block felt B (5 x 74 mm with tape)

3. Replacement procedure

3-1. Remove the key cover assembly from the unit and ﬁ t a new key cover assembly on the unit.

3-2. If the new key cover ﬁ ts with no problems in 3-1. then check the key cover assembly installation.

Fall board damper shall not easily separate from the damper holder on the unit

Shall be no contact between front top rail and key cover when opening/closing key cover (Fig. 1)

Shall be no contact between key cover felt and keys when opening/closing fall board (Fig. 2)

Keys reﬂ ected onto key cover shall appear straight when viewed (Fig. 3A)

N3 Shipping criteria: Angle between white keys and key cover shall be 90+1.5/-0.5 °

N2 Shipping criteria: Angle between white keys and key cover shall be 90±1 °

Fig. 1 When closing key cover

Fig. 3 Keys reflecting onto key cover

5 pieces each

1 piece each

12 pieces

4 pieces

2 pieces each

--- If it does not ﬁ t then make the adjustment A.

--- If it separates then perform adjustment A.

--- If there is contact then perform adjustment B.

--- If there is contact then perform adjustment C.

Fig. 2 Felt and key interrelation

--- If not then perform adjustment D.