Casio Oriental Maestro AT1 Manual de usuario

ELECTRIONIC KEYBOARD

AT-1

(without price)

CONTENTS

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Replacing the DSP (HG51B155FD) . . . . . . . . . . . . . . . . . . . . . . . . 2

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

Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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

PCB View and Major Check Points . . . . . . . . . . . . . . . . . . . . . . . 14

Schematic Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

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

IC Lead Identification and Internal Diagram . . . . . . . . . . . . . . . . 19

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

— 1 —

General

Number of Keys: 61

Polyphonic: 32-note

Preset Tones: 100

Tone Expander: Layer, Split

Keyboard Controls: Touch Response: On/Off

Touch Sensitivity: Light/Middle/Heavy

Key Transpose: Range from F# to F by a semitone increment

Oriental Scale Control: Tune: On/Off, Mode: Cent/

Koma

Tuning Rang: Quarter tone (±99 cents) and

koma

(±5

komas

)

Scale Memories: 4

Auto-Rhythms: 50

Tempo Control: 40 to 255

Auto-Accompaniment: CASIO Chord/Fingered/Full-Range Chord

Controller: Variation, Fill-In, Intro/Ending

Magical Presets: 50; BREAK BEAT 20

FREE SESSION 24

KEY SPLIT 6

Digital Effects: 10; Reverb-1, Reverb-2, Reverb-3, Chorus, Tremolo, Phase Shifter,

Organ SP, Enhancer, Flanger, EQ Loudness

Sound/Control Pads: 4

Pad Variations: 32; Phrases: 10, Drums: 10, Percussion: 10, Controllers: 2

Song Memory: 1; System: Real-time recording

Memory Capacity: Approx. 700 notes

Pitch Bender: Bend Range; 2 semitones/3 semitones

Registration Memories: 6

Registration Items: Tone Number, Rhythm Number, Tempo, Accompaniment Mode,

Accompaniment Volume, Effects, Layer On/Off, Split On/Off,

Chord On/Off, Accompaniment Scale On/Off, Pad Variation,

Assignable Jack, Auto-Accompaniment Controller, MIDI (Channel On/Off,

GM On/Off, Local Control On/Off, Bend Range)

Tuning Control: 440Hz ±50 cents

Terminals: Headphone Jack [Output Impedance: 150 Ω, Output Voltage: 5.2 V(rms)

MAX], Assignable Jack, MIDI Jacks (IN, OUT), AC Adaptor Jack (9 V)

Built-In Speakers: 12 cm dia. 2.5 W Input Rating: 2 pcs.

Power Source: 2-way AC or DC source

AC: AC adaptor AD-5

DC: 6 D size dry batteries

Battery life: Approx. 5 hours by manganese batteries R20P(SUM-1)

Auto Power Off: Approximately 6 minutes after the last operation

Power Consumption: 7.7 W

Dimensions (HWD): 129 x 942 x 367 mm

5-1/16 x 37-1/16 x 14-7/16 inches

Weight: 5.3 kg (11.7 lbs) excluding batteries

Standard Accessory: Music stand, Dust cover

SPECIFICATIONS

— 2 —

Electrical

Current Drain with 9 V DC:

No Sound Output 260 mA ±20%

Maximum Volume 930 mA ±20%

with key C3 pressed in Synth-Bass tone and effect No. E-9

Split: On, Layer: On, Oriental scale: On/Cent

Song memory: Play, Volume; maximum, Touch: maximum

Line Output Level (Vrms with 47 KΩload each cannel):

with key F2 pressed in FSynth-Bass tone 2480 mV ±20%

Phone Output Level (Vrms with 8 Ωload each channel):

with key C3 pressed in FSynth-Bass tone 97 mV ±20%

Speaker Input Level:

with key C3 pressed in FSynth-Bass tone 2240 mV ±20%

Minimum Operating Voltage: 6.3 V

REPLACING THE DSP (HG51B155FD)

Note: To increase productivity ,the DSP HG51B155FD is sticked on the main PCB with a double-side

adhesive tape, then its leads are soldered.

Remove the DSP according to the following procedures.

1. Prepare isopropyl alcohol and a flat IC desoldering machine (Spot Heater HS-600).

2. Apply plenty of the alcohol to the adhesive tape from the reverse side of the main PCB. (Fig.1)

There is a hole on the PCB just under the LSI, and the adhesive tape can be seen through the hole.

3. Leave it more than one minute so that the alcohol weaken adhesive power fully.

4. Using a proper size of nozzle, apply heat to leads of the LSI with the desoldering machine.

5. Grasp the LSI with tweezers, and using gentle force vibrate the tweezers to feel melting solder. (Fig.2)

6. Remove the LSI after meltingsolder at every leads wholly.

Alcohl

Spot Heater HS-600

Fig.2Fig.1

HG51A115A

LSI-S

— 3 —

BLOCK DIAGRAM

KC0 ~

KC7

SI0 ~ SI7

FI0 ~ FI7

Key Touch LSI

LSI106

HG52E35P

Working Strage

RAM (64K-bit)

LSI104

SRM2264LC90,10

7-Seg.

LED

LO0 ~ LO4 LED driver

IC301/302

BA612

LD0 ~ LD7

Buttons

KI1 ~ KI7 VDD

Power Switch

MIDI

OUT

EA0 ~ EA12

ED0 ~ ED7

DSP

LSI105

HG51B155FD

RA0 ~ RA19

RD0 ~ RD15

Sound Source ROM

(16M-bit)

LSI103

TC5316200CP-C106

WCK1 SLOP BCK

D/A Converter

LSI101

UPD6376CX

Filter

IC105

Main

Volume

Power Amplifier

IC102

LA4598

CPU

LSI102

HD6433298A36P

Keyboard

A0 ~ A14

POWER

Power Supply Circuit

IC101, Q1 ~ Q4

VCC AVDD VDD

LVDD DVDD

APO

Effect RAM

(64K-bit)

LSI107

SRM2264LC90,10

D0~D7

Speakers

Output

A0 ~

A12

A0 ~ A3

A0 ~ A2

LEDs

LED driver

Q109 ~ Q116 KO Signal

Generator

IC303/304

TC74HC174P

La ~ Lg, Lp

Reset IC

IC104

RE5VA35AA

RESET

CLK KO0 ~ KO10

LC1 ~ LC4

Filter

IC105

— 4 —

Note: Each key has two contacts, the first conatct 1and second contact 2.

CIRCUIT DESCRIPTION

Key Matrix

Key

Second contact 2 First contact 1 FI

F#3 G#3 A#3 C#4 D#4 F#4 G#4 A#4 C#5 D#5 F#5 G#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#2

F#2D#2

C#2 A#6

G#6F#6D#6

C#6

Nomenclature of Keys

KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7

FI0 C2 1C#2 1D2 1D#21E2 1F2 1F#2 1G2 1

SI0 C2 2C#2 2D2 2D#22E2 2F2 2F#2 2G2 2

FI1 G#21A2 1A#2 1B2 1C3 1C#31D3 1D#31

SI1 G#2 2A2 2A#2 2B2 2C3 2C#32D3 2D#32

FI2 E3 1F3 1F#3 1G3 1G#31A3 1A#3 1B3 1

SI2 E3 2F3 2F#3 2G3 2G#32A3 2A#3 2B3 2

FI3 C4 1C#4 1D4 1D#41E4 1F4 1F#4 1G4 1

SI3 C4 2C#4 2D4 2D#42E4 2F4 2F#4 2G4 2

FI4 C4 1C#4 1D4 1D#41E4 1F4 1F#4 1G4 1

SI4 C4 2C#4 2D4 2D#42E4 2F4 2F#4 2G4 2

FI5 E5 1F5 1F#5 1G5 1G#51A5 1A#5 1B5 1

SI5 E5 2F5 2F#5 2G5 2G#52A5 2A#5 2B5 2

FI6 C6 1C#6 1D6 1D#61E6 1F6 1F#6 1G6 1

SI6 C6 2C#6 2D6 2D#62E6 2F6 2F#6 2G6 2

FI7 G#61A6 1A#6 1B6 1C7 1

SI7 G#6 2A6 2A#6 2B6 2C7 2

— 5 —

Button Matrix

Reset Circuit

Initial reset

When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU.

The CPU then initializes its internal circuit and clears the working strage RAM.

Power ON reset

When the power switch is pressed, the CPU receives a low pulse of POWER signal. The CPU provides

APO signal to the power supply circuit, then provides RESET signal to the DSP, the key touch LSI and

the KO signal generators.

VDD Battery set

RESET

CPU

LSI102

HD6433298A36P

Reset IC

IC104

RE5VA35AA

Working Strage RAM

LSI104

SRM2264LC90,10

DSP

LSI105

HG51B155FD

Key Touch LSI

LSI106

HG52E35

DVDD

VDD

-RESET

POWER

From power switch

KO Signal Generator

IC303/304

TC74HC174P

-NMI

KI1 KI2 KI3 KI4 KI5 KI6 KI7

KO0 Registration 3 2 1 0

KO1 Control Demo Layer Split

KO2 Tone Rhythm 9 8 7 +

KO3 Accomp 6 5 4 -

KO4 G# down A down A# down B down G down

KO5 ScaleMode ScaleTune B up A# up A up G# up G up

KO6 Intro Start/Stop

KO7 C up C# up D up D# up E up F up F# up

KO8 C down C# down D down D# down E down F down F# down

KO9 Mode Pad B Pad D Pad A Pad C

KO10 Rec

Song

Memory

Touch

Response

Transpose/

Tune

Magical

Preset Digital

Effect

Tempo

Down Tempo

Up Synchro/

Ending Variation/

Fill-In Normal/

Fill-In

Scale

Memory 1 Scale

Memory 2 Scale

Memory 3 Scale

Memory 4

— 6 —

CPU (HD6433298A36P)

The 16-bit CPU contains a 32k-bit ROM, a 1k-bit RAM, seven 8-bit I/O ports, an A/D convertor and serial

interfaces. The CPU accesses to the working strage RAM, the DSP and the key touch LSI. The CPU also

controls buttons, bender input, LEDs and MIDI input/output.

The following table shows the pin functions of the CPU.

Digital Signal Processor (HG51B155FD)

Upon receipt of note numbers and their velocities, the DSP reads sound and velocity data from the sound

source ROM in accordance with the selected tone; the DSP can read rhythm data simultaneously when a

rhythm pattern is selected. Then it provides 16-bit serial signals containing data of the melody, chord,

bass, and percussion to the DAC. The DSP also adds the selected effect to the sound data using a 64k-bit

RAM.

The following table shows the pin functions of the DSP.

Pin No. Terminal In/Out Function

1 P40 Out KO signal data output

2 P41 Out Clock for KO signal data

3 P42 Out APO (Auto Power Off) signal output. ON: High OFF: Low

4 P43 Out Read enable signal output

5 P44 Out Write enable signal output

6 P45 Not used

7 P46 Out 10 MHz clock output

8 P47 In Wait signal input. Connected to +5 V.

9 TXD Out MIDI signal output

10 RXD In MIDI signal input

11 P52 Out Reset signal output

12 -RESET In Reset signal input

13 -NMI In Power ON signal input

14 VCC In +5 V source

15 -STBY In Standby signal input. Connected to +5 V.

16 VSS In Ground (0 V) source

17, 18 XTAL,EXTAL In 20 MHz clock input

19, 20 MD1, MD0 In Mode selection input.(Internal ROM mode --- MD1: High MD0: Low)

21 AVSS In Ground (0 V) source for the built-in DAC

22 AN0 In Analog input. Connected to ground.

23 ~ 29 P71 ~ P77 In Ternimal for button input signal

30 AVCC In +5 V source for the built-in DAC

31 ~ 38 P60 ~ P67 Out LED segment signal output

39 VCC In +5 V source

40 P27 Not used

41 ~ 56 P26 ~ P10 Out Address bus

48 VSS In Ground (0 V) source

57 ~ 64 P30 ~ P37 In/Out Data bus

— 7 —

Pin No. Terminal In/Out Function

1 ~ 8 CD0 ~ CD7 In/Out Data bus

9, 10 Not used

11 GND7 In Ground (0 V) source

12 CK16 Out 16.384 MHz clock output

13 VCC6 In +5 V source

14 CK0 In Clock input. Connected to terminal CK16.

15 TCKB Not used

16 VCC1 In +5 V source

17 GND1 In Ground (0 V) source

18, 19 XT0, XT1 In/Out 16.384 MHz clock input/output. Connected to a crystal oscillator.

20 SGL In System control terminal. Single chip system: Open

21 CCSB In Chip select signal input

22 ~ 25 CA0 ~ CA3 In Address bus

26 CE0 In Not used. Connected to ground.

27 CWRB In Write enable signal

28 CRDB In Read enable signal

29 ~ 32 Not used

33 RESB In Reset signal input

34 TESB In Not used. Connected to +5 V.

35 ~ 39 Not used

40 ~ 49

52 ~ 57

50 VCC2 +5 V source

51 GND2 Ground (0 V) source

58 RA23 Out Not used

59 RA22 Out Chip select signal for the sound source ROM

60, 61 RA20, RA21 Out Not used

62 ~ 73

75 ~ 82

74 GND5 In Ground (0 V) source

83 WOK2 Out Word clock output. Not used.

84 VCC3 In +5 V source

85 GND3 In Ground (0 V) source

86 WOK1 Out Word clock for the DAC

87 SOLM Out Serial data output. Not used.

88 SOLP Out Serial sound data output for the DAC

89 BOK Out Bit clock output for the DAC

90 ~ 92 Not used

93 VCC5 In +5 V source

94 EA14 Out Not used

95, 97

99 ~ 105

107, 109

110, 112

RD0 ~ RD15 In Address bus for the sound source ROM

RA0 ~ RA19 Out Address bus for the sound source ROM

EA0 ~ EA12 Out Address bus for the effect RAM

— 8 —

DAC (UPD6376CX)

UPD6376CX is a two-channel 16-bit Digital to Analog Convertor consisting of resistor string, output

amplifier and zero offset circuit.

Key Touch LSI (HG52E35P)

By counting the time between first-key input signal FI and second-key SI from the keyboard unit, the key

touch LSI detects key velocity of 256-step. Then the LSI sends the CPU the note number and its velocity

data.

CRDB

CWRB

CKI

CCSB

RESB

CD0

CD7

CA0 ~ CA2

First contact

Second contact

KC0

KC7

FI0

FI7

SI0

SI7

Key input signal

Key scan signal

Data bus

Address bus

Key touch LSI

LSI106

HG52E35P Keyboard

APO

A12

A14

CLOCK

RESET

Pin No. Terminal In/Out Function

1 SEL In Mode selection terminal. Connected to ground.

2 D.GND In Ground (0 V) source for internal digital circuit

3 NC Not used

4 DVDD In +5 V source for internal digital circuit

5 A.GND In Ground (0 V) source for internal analog circuit

6 R.OUT Out Right channel sound waveform output

7 A.VDD In +5 V source for internal analog circuit

8 A.VDD In +5 V source for internal analog circuit

9 R.REF In Reference voltage terminal. Connected to a capacitor.

10 L.REF In Reference voltage terminal. Connected to a capacitor.

11 L.OUT Out Left channel sound waveform output

12 A.GND In Ground (0 V) source for internal analog circuit

13 LRCK In Word clock (L/R separation signal) input.

14 LRSEL In Not used. Connected to ground.

15 SI In Sound data input

16 CLK In Bit clock input

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