Yamaha U3-SILENT Manuale di servizio - Pagina 25

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•6 STEP MAINTENANCE for the PIANO TECHNICIAN (Minimum 3 are necessary.)

Check if the hammer shank stopper do not disturb the dampers or hammers

STEP 1

movement during normal playing. --> OK STEP 2

Hammer shank stopper height/lateral adjustment is necessary if any disturbing happens. --> STEP 6

STEP 2

Depress and lock the center pedal to enter silent mode.

Check if the acoustic sound doesn't come out during

playing keyboard with mf (Mezzo forte level). If no

sound comes, then the distance between hammer head

and strings will be within 4.5mm-7mm when the

hammer shank touches the shank stopper cushion.

(Fig. 2) --> OK STEP 3

Shank stopper must be adjusted to the front if the

acoustic sound comes. --> STEP 4

If the balance of the same section is not even (ex. bass),

--> STEP 5

Note: Hammer let off (set off) adjustment must be

1mm wider than the adjusted silent mode distance.

STEP 3

Turn on the POWER and check if all 88 keys sound correctly through headphones. (The standard

volume position is at 3 o'clock.) Depress the right pedal and play some notes to check electronic sustain

function. --> OK, Complete the post-delivery inspection.

Check first that if the gray-scale shutter is damaged by taking out the keyboard when some notes sound

incorrectly. Remove dirty marks if there on the shutter by cloth. --> Refer Fig. 11 --> Test mode and

Key sensor measurement, page 4, 5

STEP 4

By rotating the turn backle (Fig. 1), the both beginning and the end of the hammer shank stopper stroke

can be changed simultaneously. Normal adjustment should be done by this adjustment. In order to get

wider stroke, put the additional felt on the bottom of the pedal lock window. It would be effective for

the old pianos. Correct adjustment makes the turnbackle movement around 8 mm (Fig. 1). --> OK

STEP 3

8mm

Fig. 1

Hammer shank stopper

Fig. 2

SILENT SB SERIES

Turn backle

The position to be glued

the additional felt.