casio AP-38 Service Manual

AP-38

INDEX

SEP. 2002

AP-38

ELECTRONIC KEYBOARD

Ver.2 Nov/ 2004

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

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

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

Diagnostic Program.......................................................................................... 4

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

Circuit Description............................................................................................ 9

Printed Circuit Boards.................................................................................... 11

Exploded View ................................................................................................ 12

Parts List ......................................................................................................... 15

Schematic Diagrams ...................................................................................... 18

SAFETY NOTICE

CAUTION! Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the appliance manufacturer.Discard used batteries according to manufacturer's instructions.

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SPECIFICATIONS

GENERAL

Models: AP-38/AP-38V Keyboard: 88 piano keys (with touch response) Polyphony: 64 notes, maximum Tones: 16

Layer: Adjustable volume

Split: Split point, adjustable volume Digital Effects: Reverb (8 types), Chorus (8 types), Brilliance Demo Tunes: • Number of Tunes: 16

• Playback: Repeat (all tunes, one tune)

Song Memory: • Operations: Real-time recording, playback

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

• Capacity: Approximately 8,000 notes (total of 2 tracks)

• Memory Backup: Built-in lithium battery (Battery Life: Approximately 5 years)

Music Library: • Number of Tunes: 50

• Playback: All song repeat, specific song

• Part Off: L, R Pedals: Damper, Soft, Sostenuto Other Functions: • Metronome: Beat (6 types), Tempo (

• Touch Select: 3 types, off

• Transpose: 1 octave (F# to C to F)

• Tuning: A4 = 440 Hz ± 50 cents (adjustable)

• Temperament: 7 types

• Baroque pitch MIDI: 16 multi-timbre receive Input/Output: • Headphones: Stereo standard jacks × 2

• LINE OUT (R, L / MONO): standard jacks × 2

Output Impedance; 1.1 KΩ Output Voltage; 1.3 V (RMS) MAX

• MIDI (OUT) (IN) Speakers: ø 16 cm × 2, ø 5 cm × 2 (Output: 20 W + 20 W) Power Supply: AP-38: 120V

AP-38V: 220-240V

Power Consumption: AP-38: 60W

AP-38V: 60W

Dimensions: • CELVIANO (without stand): 138.0 × 47.2 × 22.2 cm (54 3/8 × 18 5/8 × 8 3/4 inch)

• CELVIANO: 138.0 × 47.2 × 83.9 cm (54 3/8 × 18 5/8 × 33 1/16 inch) Weight: •CELVIANO (without stand): approximately 39.0 kg (86.0 lbs)

• CELVIANO: approximately 51.0 kg (112.4 lbs)

= 30 to 255)

• Design and specifications are subject to change without notice.

• AP-38 has hardwired power cords.

• AP-38V has detachable power cords.

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BLOCK DIAGRAM

LEDs Buttons

SW/LED

Controller

uPD65881GB

(LSI301)

Reset IC

RN5VD2BAA

IC 12

MIDI

OUT

PEDAL

ANI0 ~ 2

M-IN M-OUT

CPU

uPD703107AGJ148UEN

LSI 6

Keyboard

IC 7

IC 8

CA1 ~ 4

3VD0 ~ 15

CA1 ~ 17

Mute

FI0 ~ 10 SI0 ~ 10

KC0 ~ 7

5VD0~7

5VD8~15

S00 LR00 CK00 LR01

Keyboard Controller

TC190C020AF

LSI 1

RAM (128KB)

D442012AGYBB55XMJH

LSI 5

ROM (4MB)

MR27V6402G-0A3TP-3

LSI 2

RAM (128KB)

D442012AGYBB55XMJ1-1

LSI 4

SW400

T401

MA0 ~ 21

MD0 ~ 15

EA0 ~ 15

ED4 ~ 19

Power Supply

IC401: NJM78M05FA IC402: NJM78M15FA

DSP

uPD914AGM-3ED

LSI 3

+5V +15V

VDD AVCC

CA1 ~ 6

3VD0 ~ 15

SYCK1

D/A Converter PCM69BU/2K

D0 WCK

IC 2

Filter

IC 1, IC 5

Main Volume

Power Amp.

LM4765T

IC403

SPSP

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HEADPHONE

DIAGNOSTIC PROGRAM

■Initial Setup

1. Connect an AC adaptor.

2. Connect a Sustain pedal.

3. Connect a MIDI cable (In-Out).

4. "Main" volume: MAX.

5. Turn the BRILLIANCE knob to the center.

6. Have the headphones ready.

NOTE: If there is no pedal or MIDI cable, pedal or MIDI check can be skipped.

■ How to start diagnostic program

1. Press the “POWER” button while pressing the “CHORUS key” and “GRAND PIANO1 key” buttons.

2. Release the “CHORUS” key and the “GRAND PIANO1” key. All the LEDs turn on once.

■ Diagnostic program

1. RAM/ROM check

1 RAM/ROM check starts automatically after the diagnostic program is booted. 2 A confirmation tone of C4, E4 and G4 sounds after ROM/RAM check normally ends.

2. LED check

1 The following groups of 9 LEDs turn on one after another.

GROUP1: REVERB, CHORUS, GRAND PIANO1, GRAND PIANO2, ELEC PIANO1,

HARPSICHORD, PIPE ORGAN1, STRINGS1, CHIOR

GROUP2: ACOUSTIC BASS, VARIATION, SPLIT, SONG MEMORY, RECORD, TRACK A,

TRACK B, MUSIC LIBRARY, METRONOME

2 Press “CONTROL” button.

A confirmation tone of C4, E4 and G4 sounds.

3. SLIDER check

1 “PIPE ORGAN1” LED turns on. 2 Select “MELLOW”. 3 “GRAND PIANO 1” LED turns on. 4 Select “BRIGHT” 5 “VARIATION” LED turns on. 6 Turn the “BRILLIANCE” knob to the center. 7 Press “CONTROL” button.

A confirmation tone of C4, E4 and G4 sounds.

4. SWITCH check

1 Press “CONTROL” button.