Yamaha Electone Stagea ELS-01 Owner's Manual page 225

5
Install these two units together with the
screws removed in step 3.
First temporarily install the right-front screw, then
insert and partially fix the remaining three screws.
Finally, firmly tighten all four screws.
6
Connect the USB cables for both units to
the USB TO DEVICE terminals.
First install this screw.
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