Casio CTK-591 Service Manual

— 11 —
9. Remove 28 screws and then the PCB ASSY (CN1M).
Note: Fix the LED (D4, D5, D50, D53, D54) to the PCB according to the height as shown in the figure below while
paying attention to the polarity.
Refer to the illustration on the PCB for the details of the polarity.
Anode
Cathode
8.7 ± 0.5 mm
D4,D54: 11.0 ± 0.5 mm
D5: 11.5 ± 0.5 mm
D53
D5 D54
D52
D4
D50
■ D50, D52, D53 ■ D4, D54
■ D5

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)