Casio Realistic Concertmate 500 Service Manual

CONCERTMATE-500

Catalog Number:42-4004

CUSTOM MANUFACTURED

FOR RADIO SHACK, A DIVISION

OF

TANDY CORPORATION

CONTENTS

SPECIFICATIONS

3

BLOCK DIAGRAM

5

CIRCUIT

DESCRIPTION

6

MAJOR

WAVEFORMS

14

TROUBLESHOOTING

16

PCB (Top and Bottom Views)

17

ELECTRICAL PARTS LIST

19

MECHANICAL PARTS LIST 25

EXPLODED VIEW/DISASSEMBLY

26

1C AND

TRANSISTOR

LEAD

IDENTIFICATION

27

SCHEMATIC DIAGRAM 28

SPECIFICATIONS

Keyboard:

Chords:

Preset tones;

Effects:

Envelope selection:

Synthesizer function:

Auto-rhythms:

Auto accompaniment:

Function:

Memory play:

Sampling function:

Demonstration

function:

Terminals:

Tuning control:

Speaker:

Power

supply:

Auto

power off:

Power consumption:

Dimensions:

32 Keys

4-note polyphonic

5 PCM: piano, brass ensemble, trumpet, synth drums, human voice

3 Harmonic synthesis: flute, pipe organ, jazz organ

Vibrato, portamento

13

Harmonic synthesis

(16', 8', 5-1/3', 4', 2-2/3',

2

\

1-3/5', M/3', V

to 14 levels for each harmonic)

1 1 rhythms: disco, rock, pops, march, samba, bossa nova,

rhumba, 4-beat, swing, slow

rock, waltz

Ftll-in

key

Tempo keys

Concert chord: maj. min, 7th, min

7

Chord selector system: maj, min, 7th, min

7,

maj 7

,

dim,

sus

4,

aug 6th, min

6,

m 7-5, mM 7

Playback tones: 2

4-note polyphonic memory: 400

steps

3-channel multi-memory: Chords

99

steps,

solo

1/solo 2

198

steps

each

Auto play

One key play

Method: 8-blt PCM

Rate: 9.34

kHz

Time: 1 .4 sec. (auto trigger system)

Input method: Internal microphone, external microphone, line

Loop set

Envelope select

Toy Symphony

(one-touch endless)

MIC, LINE-IN, output (mini jacks)

t30

cents

3-1/8"

(8cm)

X

1 (output 1W)

Five

AA-size

batteries

External adapter

7 min. after

last

operation

1.8W

18-1/8"(W) X 6-1/8"(D)

X 1-3/4(H) or

461(W) X 155(D)

x44(H)mm

2.4

lbs (1.1kg) including batteries

Weight:

ELECTRICAL SPECIFICATIONS

1 . Current Drain at DC 7.5V

Input

a) No sound output

b) Maximum

sound output

with 4 keys A4

thru

D5

being pressed

simultaneously and

with tone at Flute,

mode at Normal,

envelope at

G#5

2.

Auto-power off Time

when A4 is turned to

442 Hz

3.

Output Level

with C4 key pressed in

Flute (47kohm load)

4. Sound

Pressure Level

at 10cm away

from speaker with G5

key

pressed in Flute tone

5. Pitch Variable

Range

when A4

is turned

to

442 Hz

Note: 1 i

»

1/100 half note

6.

Minimum Operating DC

Supply Voltage

for sound to not

distort noticeably

7. Mic

Input Sensibility

at 1

kHz for

sampling

8.

Line Input Sensibility

at 1kHz for

sampling

9. Line Output

Level

with

A3

key by

sampling external 1 kHz

a)

4mV input at Mic

b)

lOOmV input at

Line

Nominal

Limit

54mA

54mA

±

30%

225mA 225mA

±

30%

7 min. 30 sec. 7

min. 30 sec.

±1

min.

1.1V

1.1V

±30%

106dB 106dB

± lOdB

442Hz

±

304 442Hz

i 304

5.5V

6.0V

4mV

lOOmV

470mV 470mV

±

20%

550mV

550mV

±

20%

Note:

Nominal specs

represent the design specs; all units

should be able to approximate these

-

some will

exceed and some may drop

slightly below these specs. Limit specs

represent

the absolute

worst condition that

still might be considered

acceptable; in no case should

a unit

perform to less than

within any limit spec.

BLOCK DIAGRAM

z

^s^

i

io*ov39szoeeadrf

e B < < o o

C (ST

389l»ad*’

{2)nvti

5

S„

5|H

«“

CO

Sbb

?'<§'§

J L J4

0

1

<

1

0

a

a

0

«o

3

P 1ST

••

;c

0

OSSl^Od'*

w

a

s

lUb^VU

<A

u

1P

0

CO

sBlS?-;

S'?

^

^

o

to®

|r|

5

I

s

£11

i.ri

C

I

S

wS£

0^*0 O^h. f

<500

>

o

?

(0

u

<0

S

€f

>

t'il

ffl

iS

i

§

«

i

£

M

50 ^

09kO

1

£

S

2

S,8

=.2

^ ^ ^ W

W)

z

Oo

61^-

I

I«u6i$

mour

?

3

£

o

|60)C

-

00 X

I»u6is ^oluu>03 A»;

» »

N

|«

w

O

2

0

• V

^1

o

§

U

i/>

>

>

«

tn

'!

1

, S3.

£ s

°

2

*

o »

i

3

I

s

o

>

a

!

I

4»

?

o

0-

u w 'S

ui

I

2 a

“

V>

U.

o

S

I

rs! C

> _

E

q:

5

>

a

v>

CIRCUIT

DESCRIPTION

CPU (MSM6283

01GS; LSI Y)

•

Generates pitch

and

envelope

signals for melody,

chord,

bass, and obbligato

sounds.

•

Provides

percussion sounds.

•

Controls keys, switches,

RAMs, and ROM.

The

following is a list of

pin functionsofthe

CPU.

PinNo. Terminal Name In/Out Functkon

1 BOND Ground iOV) source ror AOC iAnalog

to Dignal Converter)

2

'

VAOC

*

-5V

source tor

AOC

3.4

T

No fur^citon.

5-11

1

100-106

»

In/Out Data bus

<100-

106).

"^12

’

AO Out .

Address

bus (AO).

13

:

107

•

*

1

m/Out Data bus

(107).

14 A1

1

Out Address bus (A1).

is’

'

CE

¥ ^

'

Out Chip enable sigr>al

for

the memory

devices.

16-18

A2. A10.

A3

T

•

Out

Address

bus <A2, A3. A 10).

19

idE

•

«

Out Output enable signal for the memory devices.

^20-30

I

A4-9. All-15 Out Address bus (A4

-

A9, A1

1

-

A15).

A

”

’31*

*

I

wt

W

w

Out Write signal output.

1

When

"L".

the CPU writes

data

into

the memory

devices.

32

1

RPSH

1

Out

Refresh signal

output.

When

'X*'. the CPU

refresh

the memory data of RAMs.

~33-39 f

r~

No

function.

40

[gno

^

Ground

(OV) source.

“‘41.42*

r

1

No function.

43

VDD1

1

1 -5V

source.

“44-66*”

No function.

"stTbs

”

,

OSI.OSO

'

Irt/Out 7.24

MHz clock pulse inputs.

59

'

1

» —

1

No function.

60

1

1

RESET In

Reset signal input. "H" active.

At power

ON,

the terminal receives art

''H"

level pulse so that the

CPU's

internal

[

circuits

are initialized.

61 ‘k015

1

t

Out |~Control

signal for external

filter circuit.

“62-66“^

No

function.

~67-76“

K09

-

KOO Out

^

Key ar>d

switch common signals

output.

77~84

1

KI1 -kl8 In

Key and switch input signals

input.

85

No function.

86 *P01

*

j

Out

APO

(Auto Power Off) signal.

When the

instrumertt is left

unoperated for approximately

7

minutes,

the

terminal

drops to

"V

level

to shut the voltages off.

87 1

. No function.

88 P03

r

Out

'

Control

signal for external

filter circuit.

Pin No.

Terminal Name

'

In/Out

1

Function

89

EH Out

{

Melody envelope signal output.

90 EG

Out

1

Melody or obbligato envelope signal output.

91 EF Out Melody

or

chord envelope signal output.

92 EE

i

Out Melody or bass envelope signal output.

93

!

SH

Out

1

Melody

pitch signal

output.

94

'

SQ

Out

'

Melody or obbligato pitch signal output.

95

SF Out

Melody or chord pitch signal output.

^

96

*

I

SE

Out Melody or bass pitch signal output.

SC

;

Out

i—

Analog percussion signal output.

,

1

98

•

AGNO

1

Ground

(OVI

source for

DAC

(Digital to Analog Converter).

99 VDAC

i

—

5V source for DAC.

j

Vin

r’

1 1

^Sample sound signal irtput.

Note: Since this LSI

functions as negative l

09

ic, OV is provided to VDD1 terminal while

*^5V

source

is appiied to GND terminal.

Keyboard Matrix

KM

1

KI2 KI3 KI4 KIS

KI6

KI7 KIS

KCO SAMPLING

j

1

LOOP SET

1

I

DEMO

ONE

KEY

PLAY

R

ONE

KEY

PLAY

L

•

KCl

PORTA-

MENTO

HARMO.

;

SYNTH.

ENVELOPE

SELECT

VIBRATO

1

F3

F3#

1

G3

G3#

KC2

MEMORY

!

PLAY 1

,1

RESET

1

1

RHYTHM

;

SELECT

1

'

FILL-IN

A3 A3#

B4

J

C4

KC3

•

•

TEMPOS

1

TEMPO

'

1

DELETE

1

CLEAR

1

i

1

C4#

f

•

1

D4

1

.

J

1

D4# E4

KC4

SAMPLING

SOUND

•

HARMONIC

'

SOUND

11

“

•
1

1

1

1

•

F4

1

•

F4# G4

» -

KC5

1

j

1

w

^ ^ ^

4

1

A4

A4#

:1

64

'

1

:

C5

•KC6

JAZZ

ORGAN

PIPE

ORGAN

1

FLUTE

1

HUMAN

VOICE

C#6 D5

1

D6#

1

1

KC7

SYNTH

DRUMS

TRUMPET

1

BRASS

lENSEMBLE

1

PIANO

'

F5

F5#

t

=5

G5#

KC8 NORMAL SOLO

1 SOLO 2 CHORD

1

A5 A5#

B5 C6

KC9

1

PLAY RECORD

!

1

POWER

OFF

Nomenclature of keys

F3 A3 C4 E4

G4 B4 OB

F5 AS

C6

G3

B3

04

F4 A4 CS £5 Q5

B&

Envelope/Pitch Mixing Circuit

The Concertmate-500 has

four Envelope/Pitch mixing circuits. The circuits generate melody,

obbligato, chord and bass sounds by

means

of a

mixing envelope and pitch signals from the CPU.

At "NORMAL" mode, all of the

four circuits generate melody signal, while they create

melody,

obbligato, chord, and bass sounds individually at the other modes.

Note:

The waveforms are

only for understanding

the principle of the above

circuit.

The actual

waveforms differ from the

figure.

(§):(!>«

10:1

Figure 2

The pitch signal PS from the CPU is amplified by differential amplifiers (transistors T1 5 and T16).

Since the envelope signal ES from the CPU is a stepped waveform, the CR circuit smoothes it.

These signals are mixed in transistor T17. and the mixed

sound signal is provided to

the filter

circuit,

Filter Change-Over Circuit & Percussion Circuit

Percusston Filter

Filter

Analog

Switch

IC2

Chord Filter

K015

CPU

P03

MSM6283

•DIGS

SC

LSI

1

(Percussion

sound signal)

Melody Filter

Figure

3

Melody

or

<C

Bdss

sound

signal

Melody

sound

signal

Melody

or

<

Chord

sound

signal

^

Melody

or

Obbligato

sound Signal

The Concerimate

500

has four Envelope/Pitch

mixing circuits.

In accordance with

the mode switch

position,

signals

P03 and K01

5

turn the analog

switches on or off so that

the sound signals

pass

through the appropriate filters.

P03

1 K015

NORMAL

'

H

L

SOLO

1

SOLO

2

:

CHORD

1

L

H

I

On "NORMAL"

mode,

all

Envelope/Pitch mixing circuits generate

melody

signals,

and the signals

pass through the melody filter. When the mode switch

is at the other position,

each Envelope/Pitch

circuit

creates

different

sound signals. These signals

pass

through

corresponding filter's.

The percussion signal comes out from the CPU directly,

wherever the mode

switch position Is set.

As the signal is a stepped

waveform,

the percussion filter shapes

it.

Sample Sound Input Circuit

VC

Figure 4. Sample

Sound Input

Circuit

Sampling

Start

Figure

5.

Vin

Input

Trigger Level

As shown In Fig.

4,

the circuit

provides sampling signals

to pin 100 Vin terminal of

the CPU.

By divider

circuit of

2

pcs of lOOkohm

resistors, the sampling signal

is biased on 2.5V.

When the sampling

sound

level

exceeds ±0.3

t5V as shown Fig.

5,

the CPU

starts to transmit

the

sampling sound

data to

the

RAMs during the following

time.

Sampling time

RAM's Capacity

(Kbit)

Sampling Data Bit

(bit) x Sampling Frequency (kHz)

108.544(Kbit)

8

(bit) X 9.387 (kHz)

s

1.4454 Sec.

s

1.4

Sec.

While sampling, the

CPU doesn't output key

common signals

(KOO

~

K09), so that the keyboard

cannot

be operated.