Assembling The Keyboard Assembly - Yamaha Portatone PSR-740 Service Manual

17.

Assembling the keyboard assembly

17-1 Install the white keys CEGB from the lower notes, and
then install the DFA keys and C' key. Afterwards install
the black keys from the higher notes, and tighten the twenty-
one (21) screws marked [140]. (Fig.8)
17-2 Install the rubber contacts in the assembly while pressing the
keys as shown in Figure 9. Check that the rubber contact
has been firmly placed into position in the area indicated by
the arrow in Figure 10.
When fitting the rubber contacts, raise both ends of the
frame so that keys do not push the rubber contact up.
Install the MK circuit board in the assembly so that the
hooks B hold it as shown in Figure 11. (Fig.9, 10, 11)
Rubber contact
Fig.9
PSR-740/PSR-640
Rubber contact
Fig.10
Hooks B
MK
Fig.11
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