Casio AP-20 Manuale utente

ELECTRONIC KEYBOARD

AP-20

(with price)

— 2 —

CONTENTS

Safety Notice...................................................................................... 2

Specifications .................................................................................... 3

Block Diagram ................................................................................... 4

PCB Layout ........................................................................................ 5

Disassembly Instructions ................................................................. 6

Circuit Description .......................................................................... 10

Major Waveforms............................................................................. 12

Troubleshooting .............................................................................. 13

Wiring Diagram ................................................................................ 17

Exploded View ................................................................................. 18

Parts List .......................................................................................... 21

Schematic Diagrams ....................................................................... 23

SAFETY NOTICE

CAUTION!

Danger of explosion if battery is incorrectly replaced.

Replace only with the same of equivalent type recommended

by the appliance manufacturer.Discard used batteries

according to manufacturer's instructions.

— 3 —

SPECIFICATIONS

GENERAL

Number of keys 88

Polyphonic: 32-note

Preset tones: 10, PIANO 1, PIANO 2, ELEC. PIANO, HARPSICHORD, VIBRAPHONE,

PIPE ORGAN, STRINGS, CHOIR, W.BASS (Lower tone only),

E.BASS (Lower tone only)

Layer/Split function

Key transpose: F#-C-F

Keyboard controls: Tuning curve, Baroque pitch

Temperaments: Equal Temperament, Kirnberger III, Werckmeister, Mean-Tone,

Just Intonation (Minor/Major), Pythagorean System

Effects: Reverb (Room, Stage, Hall 1, Hall 2)/Chorus/Tremolo/Brilliance

Demo tunes: 8, 1. Polonaise "Héroïque" (F.F. Chopin)

2. Frühlingslied Op. 62-6 (F. Mendelssohn)

3. CASIO original

4. Harmonious blacksmith (G.F. Händel)

5. CASIO original

6. Jesus, Bleibet Meine Freude (J.S. Bach)

7. CASIO original

8. CASIO original

Memory: Number of Songs: 2 (A and B)

System: Real-time recording

Memory Capacity: Approximately 3,000 notes total

Memory Backup Battery: Built-in lithium battery

Battery Life: Approximately 5 years

Pedals: Soft, Sostenuto, Damper

Tuning control: 440Hz ±50 cents

Built-In Speakers: 16 cm dia. x 2 (Output: approx. 20 W + 20 W)

MIDI: 16-channel, multi-timbral reception

Terminals: PHONES 1 and 2, MIDI (IN/OUT/THRU), LINE OUT L and R (Output Imped-

ance: 10 KΩ; Output Voltage: 2 V, RMS, max.), LINE IN R and L (Input Imped-

ance: 20 KΩ, Input sensitivity: 200 mV)

Power source: 120V (for U.S.A.),

120V, 220V, 230V and 240V (for other countries)

Power consumption: 65W (with 120V AC), 55W (with 220V, 230V and 240V AC)

Dimensions (HWD): Without stand: 185 ×1340 ×520 mm (7-5/16 ×52-13/16 ×20-1/2 inches)

With stand: 820 ×1360 ×550 mm (32-5/16 ×53-9/16 ×21-11/16 inches)

Weight: Without stand: 35.5 kg (78.3 lbs)/38.5 kg (84.0 lbs)

With stand: 45.5 kg (100.4 lbs)/48.5 kg (106.1 lbs)

Note: There are two models of AP-20, one has a keyboard cover, the other has no keyboard cover.

— 4 —

DSP

HG51B155FD

RAM

256K

HM62256BLP-10

ROM

MX23C1010PC-

12CA25

CPU

HD6435328RC13F

PEDAL

MIDI

IN OUT

ROM

8M + 16M

HN62418PD25

HN624116D44

RAM

256K ×2

HM65256BLSP-

10 ×2

Keyboard

Controller

HG52E35P

Switch & LED

Controller

µPD65005GF-419

D/A Converter

µPD6376CX

D/A Converter

µPD6376CX

Filter

Mixer, Mute Circuit

T6, T7, T10, T11

Power Amp.

STK4132MK

RA0 ~ 19

RD0 ~ 15

EA0 ~ 14

ED0 ~ 15

A0 ~ 3

A0 ~ 14

D0 ~ 7

KC0 ~ 4

KI0 ~ 3

L1 ~ 9

LA ~ J LEDs

Switches

Keyboard

KC0 ~ 7

FI0 ~ 10

SI0 ~ 10

Main

Volume

Voltage Regulator

M5F78M12L ×2

M527BL05

T8, T9

AVCC

AVDD

AVFF

VDD

+12V

+5V

–12V

+5V

SOLM, SOLP

BDK, WOK1, SORM, SORP

Power Switch

Power Transformer

T101

Reset IC

MB3771P

RST

MUTE

BRILLIANCE

MIDI MIDO

Filter

LINE IN

P70 ~

P77

P12 ~

P14

BLOCK DIAGRAM

— 5 —

POWER

VOLUME

MIN MAX

HALL 2

BRILLIANCE

MELLOW BRIGHT

CONTROL

PIANO 1

TONE

PIANO 2 E.PIANO HARPSICHORD PIPE ORGAN STRINGS CHOIRVIBRAPHONE W.BASS E.BASS

LOWER TONE REVERB

HALL 1

STAGE

ROOM

TREMOLO

CHORUS SONG A

MEMORY

SONG B RECORD START/

STOP

TUNE DEMO

OFF

MA2M

MA1M

PS1

CN2M CN1M

CN3M

IF1M

MA4M MA5M

TP10-KY1M TP10-KY2M

PCB LAYOUT

Note: IF1M PCB is a terminal board for the keyboard PCBs, and included in the main PCB.

PCB

Main PCB

Jack PCBs

Console PCBs

Power PCB

JCM433-

MA1M

MA2M

MA4M

MA5M

CN1M

CN2M

CN3M

PS1

Components

CPU, DSP, Sound Source ROM Working storage

RAM, Effect RAM Reset IC, DAC, Filter, Key con-

troller, Power amp, Power supply circuit

LINE IN/OUT jack, MIDI jacks

Phone jacks

Power indicator

Gate array (Button controller/LED driver), LEDs,

Buttons

Main Volume, Brilliance volume

Tune Buttons, Demo button

Fuse, Noise filter

— 6 —

DISASSEMBLY INSTRUCTIONS

1. Disassembling top board

1-1. Remove 8 screws on the rear.

1-2. Slide the top board towards the rear.

The top board will be free from catches on the

case.

1-3. Lift the top board.

For keyboard-cover model

2. Disassembling keyboard cover

2-1. Slide the keyboard cover to open fully.

2-2. Passing the gear into the opening on each

rack, lift the keyboard cover.

For no-keyboard-cover model

2. Disassembling the front cover

2-1. Remove 4 screws at both ends of the front cover.

2-2. Remove the front cover.

— 7 —

3. Disassembling console panel

Note: To avoid scratch on the side board, put paper between the

console panel and the side board at both ends.

3-1. The console panel is fixed with screws and nuts. Holding the

nut, remove the screw.

3-2. Remove the screw fixing a grounding wire at the transformer.

3-3. Slide the console panel towards the front to free from catches.

3-4. Turn round the console panel.

3-5. Remove the 2 screws fixing the power switch.

Insert paper here.

4. Disassembling front cover

4-1. Remove 5 screws at the front edge on the bottom.

4-2. Disconnect the connector for phone jacks from the main PCB.

4-3. Watching the phone-jack cable, pull out the front cover towards the front.

— 8 —

5. Disassembling keyboard unit

5-1. Remove 6 screws at both ends on the bottom, and a screw at the middle.

5-2. Remove 2 screws at both ends of keyboard unit.

5-3. Disconnect 2 connectors for the keyboard unit from the main PCB.

5-4. Moving the keyboard unit towards the front, remove the unit from the case.

6. Disassembling keys

6-1. Peel the red felt and sponges off the keyboard unit.

6-2. Using a long-nose plier, remove key springs.

6-3. Pressing the hook with a long-nose plier. Lift the key.

— 9 —

7. Disassembling keyboard PCBs

7-1. Turn round the keyboard unit to face the PCB

up.

7-2. Disconnect the connector at the middle of

keyboard.

7-3. Remove screws on the keyboard PCBs.

Jumper

8. Replacing the main PCB

Note: The main PCB contains a lithium battery for memory back-up. Please remove the jumper

before replacing the PCB. And make sure that the jumper is reset on new main PCB after

replacing the PCB. Because no jumper is set on a spare part of the main PCB.

— 10 —

CIRCUIT DESCRIPTION

KEYMATRIX

KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7

FI0 A0 1 A0 # 1 B0 1 C1 1 C1 # 1 D1 1 D1 # 1 E1 1

SI0 A0 2 A0 # 2 B0 2 C1 2 C1 # 2 D1 2 D1 # 2 E1 2

EI1 F1 1 F1 # 1 G1 1 G1 # 1 A1 1 A1 # 1 B1 1 C2 1

SI1 F1 2 F1 # 2 G1 2 G1 # 2 A1 2 A1 # 2 B1 2 C2 2

FI2 C2 # 1 D2 1 D2 # 1 E2 1 F2 1 F2 # 1 G2 1 G2 # 1

SI2 C2 # 2 D2 2 D2 # 2 E2 2 F2 2 F2 # 2 G2 2 G2 # 2

FI3 A2 1 A2 # 1 B2 1 C3 1 C3 # 1 D3 1 D3 # 1 E3 1

SI3 A2 2 A2 # 2 B2 2 C3 2 C3 # 2 D3 2 D3 # 2 E3 2

FI4 F3 1 F3 # 1 G3 1 G3 # 1 A3 1 A3 # 1 B3 1 C4 1

SI4 F3 2 F3 # 2 G3 2 G3 # 2 A3 2 A3 # 2 B3 2 C4 2

FI5 C4 # 1 D4 1 D4 # 1 E4 1 F4 1 F4 # 1 G4 1 G4 # 1

SI5 C4 # 2 D4 2 D4 # 2 E4 2 F4 2 F4 # 2 G4 2 G4 # 2

FI6 A4 1 A4 # 1 B4 1 C5 1 C5 # 1 D5 1 D5 # 1 E5 1

SI6 A4 2 A4 # 2 B4 2 C5 2 C5 # 2 D5 2 D5 # 2 E5 2

FI7 F5 1 F5 # 1 G5 1 G5 # 1 A5 1 A5 # 1 B5 1 C6 1

SI7 F5 2 F5 # 2 G5 2 G5 # 2 A5 2 A5 # 2 B5 2 C6 2

FI8 C6 # 1 D6 1 D6 # 1 E6 1 F6 1 F6 # 1 G6 1 G6 # 1

SI8 C6 # 2 D6 2 D6 # 2 E6 2 F6 2 F6 # 2 G6 2 G6 # 2

FI9 A6 1 A6 # 1 B6 1 C7 1 C7 # 1 D7 1 D7 # 1 E7 1

SI9 A6 2 A6 # 2 B6 2 C7 2 C7 # 2 D7 2 D7 # 2 E7 2

FI10 F7 1 F7 # 1 G7 1 G7 # 1 A7 1 A7 # 1 B7 1 C8 1

SI10 F7 2 F7 # 2 G7 2 G7 # 2 A7 2 A7 # 2 B7 2 C8 2

LSI

UPD912GF-3BA

Second contact First contact

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