CASIO AP22S Service Manual

AP-22S

ELECTRONIC KEYBOARD

CONTENTS

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

Specifications .................................................................................... 4

Block Diagram ................................................................................... 5

PCB Layout ........................................................................................ 6

Disassembly Instructions ................................................................. 7

Circuit Description .......................................................................... 11

Major Waveforms.............................................................................13

Printed Circuit Board ...................................................................... 14

Troubleshooting .............................................................................. 15

Wiring Diagram ................................................................................ 19

Exploded View ................................................................................. 20

Parts List .......................................................................................... 23

Schematic Diagrams .......................................................................25

SAFETY NOTICE

CAUTION! Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type.

— 2 —

DENMARK:

FINLAND:

ADVARSE! Lithiumbatteri. Eksplosionsfare ved fejlagtig handtering. Udskiftning ma kun ske med batteri af samme fabrikat og type. Lever det brugte batteri tilbage tili leverandoren.

SWEDEN:

VAROITUS Paristo voiäjähtää, jos se on virheellisesti asennettu. Vaihda paristo ainoastaan valmistajan suosittelemaan tyyppiin. Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.

VARNING Felaktigt batteribyte kan medf fara för explosion. Använd därför endast samma typ eller likvärdig typ enligt apparattillverkarens rekommendation.

Kassera förbrukade batterier enligt tillverkarens anvisning.

— 3 —

SPECIFICATIONS

GENERAL

Keyboard: 88 piano keys (with touch response) Polyphony: 32 notes, maximum Tones: • 10 (including two bass tones)

• Tuning Curves: 3 (preset for each tone)

• Layer: Adjustable volume

• Split: Split point, adjustable volume Digital Effects: Reverb (4 types), Chorus, Tremolo, Brilliance Demo Tunes: • Number of Tunes: 8

• Playback: Repeat (all tunes, one tune) Memory: • Operations: Real-time recording, playback

• Number of Tracks: 2 (Track A, Track B)

• Capacity: Approximately 5,000 notes (total of 2 tracks)

• Memory Backup: Built-in lithium battery (Battery Life: 5 years) Song Lesson: • Number of Tunes: 80

• Playback: All song repeat, specific song

• Part Off: L, R

• Phrase Repeat Pedals: Damper, Soft, Sostenuto Other Functions: • Metronome: Beat (6 types), Tempo (q = 30 to 300)

• Touch Select: 3types

• Transpose: 1 octave (F# to C TO F)

• Tuning: A4 + 440 Hz ±13 Hz (adjustable)

• Temperament: 7 types

• Baroque pitch MIDI: 16 multi-timbre receive

Input/Output: • Headphones: Standard stereo jacks × 2

• LINE OUT (R)(L): Standard stereo jacks × 2

Output impedance 22 KΩ Output voltage: 2.0 V (RMS) MAX

• LINE IN (R)(L): Standard stereo jacks × 2

Input impedance: 30 KΩ Input voltage 200 mV

• MIDI (OUT)(IN) Speakers: ø 16 cm × 2, ø 5 cm x 2 (Output: 30 W + 30 W) Power Supply: 120 V (for U.S.A.), 120 V, 220 V, 230 V and 240 V (for other countries) AC

household current via AC power cord supplied with piano. Power Consumption: 70 W (with 120 V AC), 90 W (with 220 V, 230 V and 240 AC) Dimensions: • CELVIANO Only: 139 × 54 × 25 cm (5.5 × 2.1 × 1.0 inch)

• CELVIANO and Stand: 139 × 54 × 88 cm (5.5 × 2.1 × 3.5 inch)

Weight: • CELVIANO Only: approximately 48.5 kg (106.9 lbs)

• CELVIANO and Stand: approximately 60.2 kg (132.7 lbs)

Accessories: Stand with three pedals, score book, power cord

— 4 —

BLOCK DIAGRAM

A0 ~ 19

RAM 256K

TC55257DFL-

70L

ROM

MX23C8000MC-

12CA73

PB4 ~ 6

BRILLIANCE

A0 ~ 14

D0 ~ 7

PEDAL

CPU

HD6435328RF35F

HG51B155FD

MIDI

OUT

M-IN M-OUT

DSP

P70 ~ P77

MUTE

Keyboard Controller

HG52E35P

P12 ~ P14

Switch & LED

Controller

µPD65005GF-419

RST

RA0 ~ 22

RD0 ~ 15

EA0 ~ 14

ED0 ~ 15

KC0 ~ 7

FI0 ~ 10 SI0 ~ 10

L18 ~ 28

KI0 ~ 3

LA ~ LG, LP

LK8 ~ 14

Reset IC

MB3771PF

Keyboard

Buttons

LEDs

ROM

24M

MX23C2410MC-

12CA58

RAM

256K × 2

TC55257DFL-

70L × 2

AVCC

AVDD

AVFF

+15V

+5V

–15V

+5V

NJM78L05A

NJM7805FA

NJM78M78M15FA

T101

Power Switch

VDD

Power

Transformer

Voltage

selector

LINE OUT

LINE IN

SOLM, SOLP

D/A Converter

µPD6376GS

Filter

Main

Volume

Mixer, Mute Circuit

BDK, WOK1, SORM, SORP

D/A Converter

µPD6376GS

Filter

SPSP

Power Amp.

STK4132MK

Tweeter Tweeter

HEADPHONE

— 5 —

PCB LAYOUT

PS3M

POWER

ONON OFFOFF

PS4M

Main PCB

Jack PCBs

PCB

PS11

CONTROLCONTROL MIDIMIDI

MELLOWMELLOW BRIGHTBRIGHT

TRANSPOSETRANSPOSE

TUNETUNE

MIDIMIDI

BRILLIANCEBRILLIANCE

METRONOME VOL

CONTROLCONTROL

TP20-KY1M

MA1M

PS2M

CN2M

BRILLIANCE

ROOMROOM STAGESTAGE HALL 1HALL 1 HALL2HALL2

VOLUME

MIN

MAXMAX

MIN

PIANO 1PIANO 1 PIANO 2PIANO 2 E.PIANO

TONE

CHORUSCHORUS TREMOLOTREMOLO

PIPE ORGAN

STRINGS

VIBRAHONE

PIPE ORGAN

STRINGS

VIBRAHONE

CHORUS/TREMOLOCHORUS/TREMOLO

JCM434-

HARPSICHORD

CHOIR

PS2M

W. BASS

LIGHT

LOWER TONE

MIDDLE HEAVY

E. BASS

TOUCH SELECT

E. BASS

TOUCH SELECT

MA1M

CN1M

MALTI FUNCTION DISPLAYMALTI FUNCTION DISPLAY

VALUE

TEMPO/BEAT/

FIXED

TRACK

RECORD

TRACK

RECORD

A B

SONG LESSON/MEMORY

PLAY/STOP

PART

SONG

PLAY/STOP

PART

LLR

DEMO

PHRASE REPEATPHRASE REPEAT NEXTMETRONOMEREVERB

TP20-KY2M

Components

CPU, DSP, Sound Source ROM Working storage RAM, Effect RAM Reset IC, DAC, Filter, Key controller, Power amp, Power supply circuit

LINE IN/OUT jack, MIDI jacks

Console PCBs

Power PCB

PS3M PS4M CN1M

CN2M PS11

Phone jacks Power indicator Gate array (Button controller/LED driver), LEDs,

Buttons Main Volume, Brilliance volume, LEDS, Buttons 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.

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.

— 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.

Insert paper here.

3-1. Remove three screws afixing the console panel. 3-2. Remove the screw fixing a grounding wire at the transformer. 3-3. Disconnect two connectors CF on PCB JCM434-PS2M and CD on PCB JCM434-MA1M

3-4. Slide the console panel towards the front to free from catches. 3-5. Turn round the console panel. 3-6. Remove the 2 screws fixing the power switch.

— 8 —

4. Disassembling front cover

4-1. Remove 9 screws at the front edge on the bottom. 4-2. Unscrew 2 screws and remove JCM434-PS4M

5. Disassembling keyboard unit

5-1. Remove 12 screws fixing front end of the keyboard unit and three screws supporting rear end of

the keyboard.

5-2. Remove 2 connectors CA and CB on PCB JCM434-MA1M. 5-3. Lift up the keyboard unit.

— 9 —

6. Disassembling keys

6-1. Pressing the hook with long-nose pliers, lift the key. 6-2. Using pliers, remove key spring.

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.

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.

Lithium battery

Jumper

— 10 —

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