Yamaha PSR-S770, Service Manual

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PSR-S770/PSR-S970
20
21. Assembling the Keyboard Assembly
21-1. Install the white keys CEGB from the lower notes.
(Fig. 13)
21-2. Install the white keys DFA and C’. (Fig. 13)
21-3. Install the black keys from the higher notes, and
tighten the twenty-one (21) screws marked [140K].
(Fig. 13)
* To install the white and black keys, insert the
projections of the keys into the respective slots [C]
on the frame first. (Photo 3, Photo 4, Photo 5)
21-4. Install the rubber contacts while pulling the keys up.
(Fig. 14, Fig. 15)
* When fitting the rubber contacts, raise both ends
of the frame so that keys do not push the rubber
contact up.
21-5. Install the MK-L and MK-H circuit boards in the
assembly so that the hooks B hold it. (Fig. 16)
MK-L MK-H
,
RUBBER CONTACT
RUBBER CONTACT
HOOK B
Fig. 13
Fig. 14
Fig. 15
Fig. 16
Photo 3 Photo 4 Photo 5
BLACK KEY
WHITE KEY C’
WHITE KEY CEGB
WHITE KEY DFA
[140K] x 21
WHITE KEY Projection Projection
FRAME [C] BLACK KEY WHITE KEY