Casio Privia PX-720 Guía de solución de problemas

ELECTRONIC KEYBOARD

(without price)

PX-720/PX-720C

SEP. 2007

Ver. 6 : Oct. 2015

PX-720C

INDEX

CONTENTS

SPECIFICATIONS ------------------------------------------------------------------------------------------ 1

BLOCK AND WIRING DIAGRAM --------------------------------------------------------------------- 2

PCB LAYOUT ----------------------------------------------------------------------------------------------- 3

CIRCUIT DESCRIPTION --------------------------------------------------------------------------------- 4

PRINTED CIRCUIT BOARDS -------------------------------------------------------------------------- 5

DISASSEMBLY --------------------------------------------------------------------------------------------- 7

DIAGNOSTIC PROGRAM ------------------------------------------------------------------------------18

EXPLODED VIEW ----------------------------------------------------------------------------------------21

PARTS LIST ------------------------------------------------------------------------------------------------23

SCHEMATIC DIAGRAMS -------------------------------------------------------------------------------27

– 1 –

SPECIFICATIONS

Keyboard: 88-key piano keyboard, with Touch Response

Maximum Polyphony: 128 notes

Tones: 11

• Layer (excluding bass tones)

• Split (Low-range bass tones only)

Effects: Brilliance (−3 to +3), Reverb (4 types), chorus (4 types), Acoustic Resonance

Metronome:

•

Beats: 0, 2, 3, 4, 6

• Tempo Range: 20 to 255

Duet: Adjustable tone range (−1 to +2 octaves)

Music Library:

•

Number of Songs: 60

• Song volume: Adjustable

• Part On/Off: L, R

Recorder:

•

Functions: Real-time recording, playback

• Number of Song: 1

• Number of Tracks: 2

• Capacity: Approximately 5,000 notes total

• Recorded Data Protection: Built-in ﬂash memory

Pedals: Damper, soft, sostenuto

Other Functions:

•

Touch Select: 3 types, Off

• Transpose: 2 octaves (−12 to 0 to 12)

• Tuning: A4 = 440.0 Hz ±99 cents (variable)

• Operation Lock

MIDI: 16-channel multi-timbre receive

Inputs/Outputs:

•

PHONES jack: Stereo standard jacks × 2

Output impedance: 170Ω

Output Voltage: 5.6V (RMS) MAX

• Power: 12V DC

• MIDI OUT/IN terminals

• Pedal connector

Speakers:

12cm × 2 (Output 8W + 8W)

Power Requirements: AC Adaptor: AD-12

Power Consumption: 12V 18W

Dimensions: Digital Piano and Stand: 137.1 (W) × 29.8 (D) × 79.2 (H) cm (54 × 11 3/4 × 31 3/16 inch)

Weight: Digital Piano and Stand: approximately 32.0 kg (70.5 lbs)

– 2 –

BLOCK AND WIRING DIAGRAM

RAM (64Mbit)

IC2

Reset IC

IC1

RESET

12MHz

SAD0 ~ SAD12,

SDBA0,SDBA1

SDD0 ~ SDD15

D8 ~ MD15

Power Amplifier

IC201

Filter

IC205

FLASH (128Mbit)

IC6

ROM (16Mbit)

IC7

A1 ~ A20

D0 ~ D15

MA0 ~ MA3

MD0 ~ MD15

KEY CONTROLLER

IC11

Keyboard

Power Supply Circuit

IC202,Q206,Q207

(12V)

VA12

(5V)

VD5

(5V)

VE5

(12V)

Speakers

(L) (R)

Main

Volume

CONSOLE PCB

(M681-CNA1)

CONSOLE PCB

(M406-CNA4)

Keyboard PCBs

(MCPZ-KYA1/KYB2/KYA3)

SUB PCB

(M408-PSA1)

CONSOLE PCB (M681-CNA3)

CONSOLE PCB

(M681-CNA2)

MAIN PCB (M408-MDA1)

Buttons

SI0 ~ SI10

FI0 ~ FI10

LOUT ROUT

KC0 ~ KC7

MPU

IC5

Control signal

Power

Switch

DAC

IC10

CN9CN13CN2

CN601CN211

CN605

CN14

CN602

CN206

CN203

CN207

CN603

CN15

CN604

CN607

CN606 CN201

CN209

CN204

– 3 –

PCB LAYOUT

PCB Components

MAIN PCB M408-MDA1 MPU, Reset IC, RAM(64Mbit), FLASH memory(128Mbit),

ROM(16Mbit), DAC, Key controller

SUB PCB M408-PSA1 Power supply circuit, Filter, Power amplifer

Console PCBs M681-CNA1 Button, Main volume

M681-CNA2 Phones jack

M681-CNA3 DC 12V terminal, MIDI OUT/IN terminals

M681-CNA4 Power lamp

Rear

M408-MDA1 PCB

M681-CNA1 PCB

M68

NA4 P

M681-CNA2 PCB

M681-CNA3 PCB

M408-PSA1 PCB

– 4 –

CIRCUIT DESCRIPTION

KEY MATRIX

NOMENCLATURE OF KEYS

KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7

FI0 A0A0#B0C1C1#D1D1#E1

SI0 A0A0#B0C1C1#D1D1#E1

FI1 F1F1#G1G1#A1A1#B1C2

SI1 F1F1#G1G1#A1A1#B1C2

FI2 C2#D2D2#E2F2F2#G2G2#

SI2 C2#D2D2#E2F2F2#G2G2#

FI3 A2A2#B2C3C3#D3D3#E3

SI3 A2A2#B2C3C3#D3D3#E3

FI4 F3F3#G3G3#A3A3#B3C4

SI4 F3F3#G3G3#A3A3#B3C4

FI5 C4#D4D4#E4F4F4#G4G4#

SI5 C4#D4D4#E4F4F4#G4G4#

FI6 A4A4#B4C5C5#D5D5#E5

SI6 A4A4#B4C5C5#D5D5#E5

FI7 F5F5#G5G5#A5A5#B5C6

SI7 F5F5#G5G5#A5A5#B5C6

FI8 C6#D6D6#E6F6F6#G6G6#

SI8 C6#D6D6#E6F6F6#G6G6#

FI9 A6A6#B6C7C7#D7D7#E7

SI9 A6A6#B6C7C7#D7D7#E7

FI10 F7F7#G7G7#A7A7#B7C8

SI10 F7F7#G7G7#A7A7#B7C8

F#3G#3 A#3 C#4D#4 F#4G#4A#4 C#5D#5 F#5G#5 A#5

F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 C6

D#3

C2 D2 E2 F2 G2 A2 B2 C3 D3 E3 B6A6G6F6E6D6 C7

C#3A#2G#2F#2D#2C#2

C1 D1 E1 F1 G1 A1 B1A0 B0

A#1A#0 G#1F#1D#1C#1 A#6G#6F#6D#6C#6

B7A7G7F7E7D7 C8

A#7G#7F#7D#7C#7

BUTTON MATRIX

SWB SWC SWD SWE

SI0

SONG

/

MODERN

METRONOME

SI1 L / R RECORDER CLASSIC

TONE/

SETTING

– 5 –

PRINTED CIRCUIT BOARDS

Main PCB M408-MDA1

Sub PCB M408-PSA1

– 6 –

Console PCB M681-CNA1 Console PCB M681-CNA2

Console PCB M681-CNA3 Console PCB M681-CNA4

– 7 –

DISASSEMBLY

■ To remove main body and speaker box.

*The screws come with the cap.

*Do not forget to attach the screw caps when assembling.

1. Remove the Connector and Pedal cord.

2. Remove 2 screws and then the Pedal unit

3. To damage neither the ﬂoor nor the main body, the main body is put on the mat or the blanket, etc.

4. Remove 8 screws and take off the left and right outer side covers.

ConnectorPedal cord Screws

Pedal unit

Main body

Speaker box

– 8 –

■ Speaker box disassembly

1. Remove the 20 screws and then the back of the speaker box.

2. Remove the 4 screws for each speaker and then take out the speakers (left and right).

■ Removing the T-BRD-UNIT.

1. Remove 18 screws and then the T-BRD unit.

T-BRD unit

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