Casio CTK-591 Service Manual

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10.Remove 13 screws and then the lower case.
11.Remove 19 screws and then the PCB ASSY (KY1M, KY2M).
12.Remove the rubber keys.
Note: Pay attention to the positions of the rubber keys as one of them has a different length.
Match the projections of the rubber keys with the holes of the lower case when reassembling.
Note: Tighten the screw with the arrow mark in the figure first when reassembling.
Cushion
Projection

Casio CTK-591 Specifications

General

Number of Keys	61
Rhythms	100
MIDI	Yes
Power Supply	9V DC
Keyboard	Standard
Display	LCD
Polyphony	12 notes
Terminals	MIDI
Effects	Reverb
Auto Accompaniment	CAS (Casio Auto-Accompaniment System)