Casio Celviano AP-21 User manual

ELECTRONIC KEYBOARD

AP-21

MAY 1999

AP-21

— 1 —

CONTENTS

Safety Notice...................................................................................... 1

Specifications .................................................................................... 2

Block Diagram ................................................................................... 3

PCB Layout ........................................................................................ 4

Disassembly Instructions ................................................................. 5

Circuit Description ............................................................................ 8

Major Waveforms............................................................................. 10

Troubleshooting .............................................................................. 11

Wiring Diagram ................................................................................ 14

Exploded View ................................................................................. 15

Parts List .......................................................................................... 16

Schematic Diagrams ....................................................................... 19

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.

— 2 —

SPECIFICATIONS

GENERAL

Number of keys: 88

Polyphonic: 32-note

Preset tones: Piano-1, Piano-2, Electric Piano, Harpsichord, Vibraphone, Pipe Organ, Strings,

Choir.

Keyboard Controls: Touch sensitivity (Initial touch: Light/Middle/Heavy),

Tuning curve (Standard/Electric piano/Flat),

Baroque pitch (On/Off)

Pedals: Soft/Sostenuto, Damper

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

Transpose: F# - C - F

Tuning control: A4 = 440Hz ±50 cents

Demonstration tunes: 1: Polonais "Héroïque" (F.F. Chopin) 5: CASIO original

Frühlingslied Op. 62-6 (F. Mendelssohn)

jesus, Bleibet Meine Freude (J.S. Bach)

3: CASIO original 7: CASIO original

4: Harmonious blacksmith (G.F. Händel) 8: CASIO original

Memory: Real-time recording [Number of Songs: (A and B), Capacity: Approx. 3,000

notes total]

Backup Battery [Built-in lithium battery: BR2330, Battery life: Approx. 5years]

Terminals: LINE IN Jack [Input impedance: 30KΩ, Sensitivity: 200mV]

LINE OUT Jack [Out put impedance: 22KΩ, Output voltage: 2.0V (rms) MAX],

Phone Jack [6.3ø, stereo], MIDI jack (IN, OUT, THOUGH)

Speakers: 16cm dia. Approx. 20W input Rating: 2 pcs.

Power source: AC source (120V, 230/240V)

Power consumption: 48W (120V AC), 62W (230/240V AC)

Dimensions: 7-3/4" (H) ×54 (W) ×18 - 1/2" (D)

198mm (H) ×1370mm (W) ×470mm (D)

Weight: 36.4kg (80.3 lbs) /45.5kg (100.3 lbs) with stand

C2# D2# C6# D6# G6#F6# A6# C7# D7#

D2 G7

G1#

A0 B0 A2F1 F2G1 G2A1 B1 B2C1 D1 C6E1 E2 G6E6 F6 A6 B6 C7D6 E7 F7D7C2 C8B7A7

A1# A2#G2#F1# F2#D1#C1#AD# A7#G7#F7#

Nomenclature of keys

— 3 —

BLOCK DIAGRAM

Keyboard Pedal

unit

FI0~FI10

SI0~SI10

L1~L18

KI0

KI3

KC0~

KC7

Mute signal

D0~D7

SOLP

SORP

Reset signal

VDD (+5V)

AVDD (+5V)

AVCC (+15V)

AVFF (-15V)

Mute signal

IC 408

IC 411 Main

volume

BOK, WOK1

SOLM

RD0~RD15

RA0~RA22

ED0~

ED15 EA0~

EA14

A0~A14

A0~A16

MIDI

OUT IN THROUGH

Damper

P10, P12~P16,

P93, P94, P97

P70~P77

P12~P14

BRILLIANCE

Key touch LSI

LSI 10

HG52E35P CPU

LSI 1

HD6435328RC13F

LSI-S

LSI 7

HG51B155FD-1

LSI4,5

UPD6376GS-E1

DAC

LPF

MIXER

IC 406

Reset IC

IC 5

Power supply

circuit

Power

amp.

IC 405

Sound Source Rom

(3M-bit)

LSI 6

MX23C2410MC-12CA58

System ROM

LSI 2

2M-bit

LH532KU3

Effector RAM

256K-bit

LSI 8, 9

TC55257DFL-70L

Working strage

LSI 3

SRAM 256K-bit

TC55257DFL-70L

LEDS

Console

Gate array

LSI 301

UPD65005GF

-419

KC0

KC4

— 4 —

PCB LAYOUT

PCB

Main PCB

Sub PCB

Console PCB

Other PCBs

JCM358-

MA1M

PS2M

CN1M

CN2M

PS12

PS3M

PS4M

Components

CPU, LSI-S, Sound Source ROM Working storage

RAM, Effect RAM Reset IC, DAC, Key Controller

Filter, Lineout Amp., Power Amp. Power supply cir-

cuit. MIDI input/output.

LEDs, Buttons, Gate array

Main Volume

Fuse

Head phone Jack

Power lamp

POWER

VOLUME

MIN MAX

TRANSPOSE/

TUNE/MIDI DIGITAL

EFFECT CHORUS REVERB

REVERB2

REVERB1

TONE

PIANO E.PIANO HARPSI-

CHORD PIPE

ORGAN STRINGS

SONG A

SONG B RECORD

START/

STOP

DEMO

MEMORY

OFF

AP-21

MA1M

PS2M

PS12

PS3M

PS4M

CN1MCN2M

KY1M KY2M KY3M

— 5 —

DISASSEMBLY INSTRUCTIONS

1. Removal of top board

1-1. Remove 6 screws affixing the top board on the back.

1-2. Slide the top board forward and remove it from the main

unit.

2. Removal of keyboard cover

2-1. Lift up the keyboard cover full open position.

2-2. Unscrew the L-shaped stopper metal located on the inner

left corner.

2-3. Lift up the keyboard cover gear from the opening where

stopper metal is fixed then remove the keyboard cover.

— 6 —

5. Removal of keyboard unit

5-1. Disconnect connector CA on the PCB MA1M.

5-2. Remove 23 screws that affix the keyboard unit

(16 on the bottom of the case and 7 on the

keyboard unit).

5-3. Lift and remove the keyboard unit.

4. Removal of front cover

4-1. Remove 6 screws from the front end of the lower case.

4-2. Lift the front cover and remove the pilot lamp that is affixed

by 2 screws. Then remove the front cover.

3. Removal of console panel

3-1. Remove screws affixing both ends of the console panel.

3-2. Disconnect connector CD on PCB MA1M, connector CF on PCB PS2M, and transformer grounding

wire.

3-3. Lift the console panel and turn it over and remove the power switch, which is affixed by 2 screws.

Then remove the side panel.

Caution: Be careful not to scratch the side panels.

Earth cable Screw Connector (CD) Connector (CD)

screws

Keyboard screws

Front cover screws

Bottom

Keyboard screws

— 7 —

6. Removal of keys

6-1. While plying the side partition plastics with tweezers, lift

the edge of the key toward front.

7. Removal of keyboard PCB

7-1. Lay the keyboard so that keyboard PCBs face upward.

7-2. Remove screws on keyboard PCBs (10 screws on PCBs

KY1M and KY3M, 12 screws on KY2M).

7-3. Unsolder the cable.

8. Totes on replacing the main PCB.

A lithium battery is set on the main PCB for memory protection.

When you replace the main PCB, disconnect the jumper to open battery circuit.

Since there is no jumper on a new main PCB, be sure to set a jumper.

jumper

— 8 —

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

HG52E35P

Second contact First contact

— 9 —

POWER SUPPLY CIRCUIT

The power supply circuit generates five voltages as shown in the following table.

Name Voltage For operation of

VDD +5 V CPU, Reset IC, DSP, Sound source ROM, Working storage RAM, Effect RAM,

Key touch LSI, Gute array, LEDs

AVDD +5 V DAC

AVCC +15 V Filter, Mixer

AVFF -15 V Filter, Mixer

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