Jvc Kb-700 User manual

No.

6516

June

1983

3-700

B/N/H

Contents

Page

o

Specifications

....

Guide

for

Playing

(Owner's

Manual).(Insertion)

Safety

Precautions,

Features,

Main

Parts

Location

...

3

Outline

of

Microcomputers

in

This

Keyboard

.

4

O

Disassembly

.

Adjustment

..

.

10

Presets

Chart

...

1

Block

Diagrams

..*.

1

3

Circuit

Schematic

Diagrams.14

CP

Board.

1

4

RS

ET

Board

.*

*

15

DM,

CC,

MKM

Board

.16

1C

Block

Diagram

.

1

7

Page

Pattern

Diagram.16

Rhythm

Patterns.21

Parts

List

.23

Parts

List

by

Kind

.24

Cabinet

Assembly..

26

Manual

Key

Assembly..

.

28

DM

Board

Assembly.30

RS

Board

Assembly..

•

31

CP

Board

Assembly.32

Other

Board

Assemblies.34

KF-1

Assembly.34

Packing,

Accessories

.35

Optional

Accessories.36

Specifications

Item

Description

Sound

source

2

master

sound

sources

Solo

preset

:

Monophonic

system

Orchestra

preset:

8-note

polyphonic

system

Keyboard

61

keys

(C2~C7;

5

octaves)

'

Mode

Accompany-

ment

Melody

Key

split

FULL

0

61

Key

split

1

Left

19

Right

42

Key

split

2

Left

24

Right

37

Solo

synthe.

preset

JL

Trumpet

jh.

Pan

flute

Guitar

Synthe.

tone

Solo

keying

Orchestra

preset

JL

String

ensemble-*-

Trombone

Piano

E

l

e

c

-

P

i

a

n

o

Organ

Jazz

organ

Harpsichord

Hawaiian

guitar

Trumpet

Clarinet

Vibraphone

Jazz

flute

Accompany-

ment

tone

Accomp.

strings

Bass

Effect

Magic

foot

(Sustain,

Bend,

Full-in),

Presence

control,

Sustain

lever

(Base,

Orchestra),

Ultra¬

chord

(Open,

Off,

Close),

Stereo/Ensemble

switch,

Tremolo,

Sustain

switches

Stereo

pan

pot

mixer

Pan

pot:

(1.

Base,

2.

Accomp./Arpegio,

3.

Strings,

4.

Orchestra,

5.

Solo

synthe./Mic.)

Mixer:

(1.

Autorhythm,

2.

Base,

3.

Accomp.

4.

Arpegio,

5.

Accomp.

strings,

6.

Orches¬

tra,

7.

Solo

synthe.)

__—

Item

Description

Auto¬

rhythm

Rhythms:

14

patterns,

Stereo

rhythm

1

Waltz,

Samba,

Polka/March,

Bossanova,

Rumba,

Tango,

Disco,

Rock

I,

Rock'n

roll,

Legae,

Swing,

Rock

II,

Slow

rock,

Shaffle

Rhythm

tempo,

Synchro-start,

Intro.

&

Fill-in,

Start

&

Stop

Tact.Beat

conductor

(4

LEDs)

Tempo

range.

J

=45~280

Fascinating

chord

Normal,One-finger,Multi-finger,Chord

memory

Accomp.

(Piano/Guitar),

Arpegio

variation

(3),

Base

variation

(1,2,

3,

Auto-variation),

Key

split,

Key

transpause

Compu-

corder

Record

(Chord/Base),

Replay,

3

musics

selector

(up

to

62

bars)

Other

controls

Power

switch,

Total

volume

control,

Solo

synthe.

pitch

control

(Solo

pitch)

Orchestra

pitch

control

(Main

pitch)

External

Expression

pedal

terminal

Mic

terminal

(w/volume):

—60

dB

AUX

OUT

(Stereo

jack):

—6

dB

Magic

foot

terminal

(Magic

foot

is

an

accessory.)

Headphone

terminal

Max.

output

4W

+

4W

(AC)

2.5

W

+

2.5

W

(DC)

Power

source

AC

240/220/110

V,

50/60

Hz

DC

12

V

(SUM1

cell

x

8

—

not

provided)

(Car

battery

—

with

CN332

adaptor*)

Power

consumption

29

W

(Switch

ON)

1.8

W

(Switch

OFF)

Battery

life

3

hours

approx,

(continuous

operation/max.vol.)

Speaker

0

14

cm

x

2

Other

Battery

warning

light

(Power

LED)

Dimensions

950

mm(W)

x

99

mm(H)

x

330

mm(D)

Weight

9.3

kg

(without

batteries)

Finish

2-tone

color

(Black

&

white)

with

plastic

case

2

KB-700

B/N/H

Safetey

Precaution

1.

Make

sure

to

use

the

specified

parts

for

those

marked

with

/k

symbol.

2.

Return

the

clamp

near

the

power

supply

to

original

po¬

sition

after

servicing.

3.

Disconnect

the

power

before

removing

connectors

of

various

units

and

circuit

boards.

4.

IMPORTANT:

(Model

KB-500B

only)

The

wires

in

the

mains

lead

(power

cord)

are

coloured

in

accordance

with

the

following

code:

Green-and-Yeilow

:

Earth

Blue

:

Neutral

Brown

:

Live

The

wire

which

is

coloured

Green-and

Yellow

must

be

connected

to

the

treminai

in

the

plug

which

is

marked

by

the

letter

E

or

by

the

safety

earth

symbol

i

°

r

co¬

loured

green

or

green-and-yellow.

The

wire

which

is

coloured

Blue

must

be

connected

to

the

terminal

which

is

marked

with

the

letter

N

or

co¬

loured

blue

or

black.

The

wire

which

is

coloured

Brown

must

be

connected

to

the

treminai

which

is

marked

with

the

letter

L

or

co¬

loured

brown

or

red.

Features

u

Variegated

auto-accompanyment

system

by

adopting

the

multi-functional

microcomputer

system.

a

Compucorder

memorizing

chord

and

bases

of

62

bars

of

3

musics

n

Key

split

switches

over

the

accompanyment

keyboard

from

a

range

to

another.

b

Easy

transposing

by

use

of

the

key

transpose

function.

m

Stereophonic

auto-rhythm.

m

Pan

pot

mixer

helps

to

make

right

and

left

sound

images

differently

and

free.

■

Magic

foot

controls

three

kinds

of

effects,

a

Solo

synthe.

presets

and

orchestra

presets

in

the

two

master

sound

source

system

a

Solo

synthe.

presets

with

solo

keying

function

thank

to

a

quasi-synthesizer

circuit

system,

a

Orchestra

presets

of

8-note

polyphonic

system

Main

Parts

Location

Fig.

1

21

Fuse

R520

Speaker

P.

Transformer

Q29

Super

Capacitor

CPU

DM

P.C.B.

So

MKM

P.C.B.

R320

3

B-700

B/N/H

Outline

of

Microcomputer

in

This

Keyboard

1.

M

a

i

n

functions

of

microcomputers

•

Keying

of

orchestra

presets

(including

sound

source

dividing

function)

•

Sound

source

dividing

for

solo

presets

•

Fascinating

chord

•

Auto-rhythm

•

Selecting

of

presets

and

effects

•

compucorder

•

Key

transpose

•

Ultrachord

•

Key

split

•

Turning

on

and

off

of

LEDs

2.

B

l

o

ck

diagram

Rhythm

pulse

Key

pulse

(UKP)

Backing

pulse

Glide

control

pulse

Solo

synthe

se|ect

Fig.

2

3.

1

C

terminals

■

CPU

MSM80C49-40RS

(2

K

bites

ROM,

128

bites

RAM,

8-bit

1-chip

type)

CPU

controls

all

operations

according

to

the

programs

of

the

built-in

ROM

and

an

Power

source

Ceralock

j:-

for

clock

5=

Reset

by

input

L

Rhythm

tempo

IN

Outputs

for

ROM

and

RAM

controls

Composite

ports

Data

bus

T

0

1

40

+

5

V

F

X

1

2

39

T

l

X

2

3

38

P2-

7

RES

4

37

P2-

6

s

5

36

P2-5

HTt

6

35

P2-

4

E

A

34

PI-7

To

8

33

PI-

6

PSEN

9

32

P

1

-

5

w"r

10

31

PI

-

4

ALE

1

30

PI

-

3

D

8

®

12

29

PI-

2

OBI

13

28

PI

-

1

0

B

2

14

27

P

l-

*

0

B

3

15

26

+

5

V

0

B4

16

25

PRO

G

0

B

5

17

24

P2

-

3

D

8

6

18

23

P2-2

■

0

8

7

19

22

P2

-

1

G

N

0

'

20

21

P2-

»

additional

ROM

(MSM83C55).

-.J

Data

output

for

POTS

Port

2

Solo

synthe.

key

pulse

Piano/guitar

switchover

Port

1

Input

Switch

ON

data

of

Manual

key.

Fascinating,

Auto-rhythm,

Presets,

etc.

Port

2

Output

for

ROM

&

RAM

controls

Fig.

3

4

KB-700

B/N/H

■

Microcomputer

scanning

block

diagram

The

14-bit

binary

code

turned

out

from

ports

A

and

B

of

ROM

(MSM83C55)

scans

every

switch

and

enters

into

port

1

of

CPU

through

the

buffer,

and

CPU

outputs

various

kinds

of

commands

according

to

the

information

input.

5

KB-700

B/N/H

J

ROM

(MSM83055-18RS)

ROM

memorizes

all

the

program

and

also

receives

switching

informations.

Reset

Control

input

Data

bus

CE

T

^

J

40

vcc

CE

2

39

P

B7

C

LK

3

38

P

B6

RES

4

37

P

B

5

NC

5

36

P

B4

READY

6

35

P

B3

10/M

7

34

P

B

2

For

8

33

P

B

1

rd

9

32

PB0

fow

1

0

3

1

P

A7

ALE

1

30

P

A6

A

D0

1

2

29

P

A

5

A

D

1

3

28

P

A4

A

D

2

1

4

27

P

A

3

A

D

3

1

5

26

P

A2

A

D

4

1

6

25

P

A

1

A

D

5

1

7

24

PA0

A

D

6

1

8

23

A

DIO

A

D

7

1

9

22

A

D

9

GND

20

2

1

A

D

8

Outputs

of

scanning

signal

of

switching

on/off

information

]

Control

input

(from

CPU

port

2)

Fig.

5

■

RAM

(MSM81C55RS)

RAM

memorizes

codes

by

CPU's

control.

IC1

outputs

the

sound

source

of

the

solo

presets,

rhythm

pulse,

key

pulse

and

signals

for

switching

solo

presets.

IC2

turns

out

signals

for

POTS

data,

switching

of

orchestra

presets,

turning

on

LEDs,

etc.

IC2

UKP

Orchestra

glide

1

MHz

input

for

Solo

2'

OUT

Control

input

(from

CPU)

Data

bus

P

C

3

1

V/

40

+

5

V

P

C

4

2

39

P

C

2

T

1

N

3

38

PC

1

RES

4

37

P

C

0

P

C

5

36

P

B

7

TOUT

6

35

P

B

6

1

O/M

7

34

P

B

5

CE

8

33

P

B

4

RD

9

32

P

B

3

WR

1

0

3

1

P

B

2

ALE

1

30

PB

1

D

B

0

1

2

29

PB0

DB

1

3

28

P

A7

D

B

2

1

4

27

PA

6

D

B

3

1

5

26

P

A

5

D

B

4

1

6

25

P

A4

DB

5

1

7

24

PA

3

D

B

6

1

8

23

PA

2

D

B

7

1

9

22

PA

1

D

B

8

20

2

1

P

A

0

Rhythm

ON

u

Backing,

Envelope

OUT

Solo

synthe.

preset

select

Auto-rhythm

pulse

OUT

Fig.

6

Tremolo

control

LKP

output

Reset,

Sustain

control

Control

input

Data

bus

P

C

3

1

40

+

5

V

P

C

4

2

39

PC

2

—|

T

1

N

3

38

PC

1

RES

4

37

PC0

PC

5

36

P

B

7

TOUT

6

35

P

B

6

1

O/M

7

34

P

B

5

CE

8

33

P

B

4

RD

9

32

P

B

3

WR

1

0

3

1

P

B

2

ALE

1

30

P

B

1

DB0

1

2

29

PB0

—

DB

1

3

28

P

A

7

—

DB2

1

4

27

PA

6

D

B

3

1

5

26

P

A

5

D

B

4

1

6

25

PA

4

—

D

B

5

1

7

24

PA

3

—

D

B

6

1

8

23

PA

2

D

B

7

1

9

22

PA

1

D

B

8

20

2

1

PA0

-

LED

lighting

control

Orchestra

preset

control

output

Data

output

for

POTS

Fig.

7

6

<B-700

B/N/H

Disassembly

1.

R

e

m

o

v

a

l

of

the

base

cover

1)

Remove

the

battery

cover

first,

then

take

out

bat-

4)

Remove

2

tapping

screws

C

.

ies

°

5)

Remove

the

cover

taking

special

care.

2)

Remove

10

tapping

screws

A

.

3)

Remove

4

screws

with

washers

B

.

2.

C

h

e

c

k

i

n

g

up

voltages

on

the

PC

board

■

In

case

of

checking

up

almost

all

parts

of

boards

ex¬

cept

a

part

of

the

CP

board,

remove

4

screws

fixing

the

RS

board

as

shown

in

Fig.

1.

m

When

checking

up

the

innermost

part

of

the

CP

board,

remove

the

board,

transformer

and

battery

holder

first.

TR

Q29

P.

Transformer

Fig.

11

Note:When

re-assembling

the

boards

and

parts

removed

once,

take

great

care

not

to

make

a

mistake

in

applying

screws.

Screws

for

plastics

have

larger

pitches

while

smaller

pitches

for

steel

goods.

3.

R

e

m

o

v

a

l

of

volume

control

knobs

and

switch

knobs

1)

Knobs

of

volume

controls

can

be

removed

by

pulling

outwards.

2)

To

remove

switch

knobs

place

the

board

as

shown

in

Fig.

11

and

push

out

them

with

a

minus

screwdriver

or

the

like

through

the

square

hole

of

the

board.

When

fitting

knobs

again,

take

care

about

colors

of

knobs.

(Refer

to

page

19.)

8

KB-700

B/N/H

4.

R

e

m

o

v

a

l

of

PC

board

Refer

to

Fig.

11.

Remove

10

screws

fixing

switches

in

the

hole

of

the

CP

board

and

4

screws

fastening

the

board.

Slide

volume

control

knobs

can

be

removed

by

pulling

the

board

upwards.

5.

R

e

m

o

v

a

l

of

manual

keys

1)

After

completion

of

the

above

item

4,

remove

8

screws

fastening

the

key

chassis

to

remove

the

chassis.

2)

Removal

of

key

Depressing

the

point

C

of

the

figure

puli

it

in

the

direction

of

D

to

remove.

When

removing

a

black

key,

first

remove

two

white

keys

it

and

remove

the

black

key

in

the

same

manner

as

for

white

keys.

Fig.

12

6.

R

e

m

o

v

a

l

of

the

music

stand

(smoked

cover)

Remove

screws

inside

(see

Fig.

14),

and

push

the

cover

holder

with

a

screwdriver

and

the

like

in

the

direction

of

the

arrow

mark

(removal

on

one

side

only).

After

that

stand

the

cover

and

it

will

be

removed

easily.

3)

Fitting

of

keys

Taking

care

about

setting

a

coil

spring

on

the

projec-

jection

of

the

key

chassis,

press

the

point

E

and

insert

the

key

into

a

square

hole

F.

Fig.

14

9

B-700

B/N/H

Adjustment

Adjustments

should

be

performed

in

the

order

of

the

numbers.

Item

IVleasuring

device

Adjusting

point

Measuring

point

Conditions

Main

oscillator

frequency

(Organ)

Frequency

counter

CP

Board

LI

coil

R17

Orchestra

preset:

Organ

Orchestra

volume:

MAX.

Main

pitch:

Center

Solo

oscillator

frequency

(Solo,

Synthe.)

By

ear

DM

Board

LI

coil

Solo

preset:

Pan

flute

Solo

volume:

Center

Orchestra

preset:

Organ

Orchestra

volume:

Center

Solo

pitch:

Center

Accomp.

strings

envelope

Oscillo¬

scope

CP

Board

R229

R45

Key

split:

1

Accomp.

string:

MAX.

Adjusting

Method

Depressing

A6

key

(highest

La)

turn

the

coil

LI

so

that

the

frequency

becomes

7072

Hz.

Depressing

a

key

as

your

option

and

hear¬

ing

sound,

adjust

LI

so

that

the

sound

be¬

comes

zero

beat.

Turning

ON

and

OFF

C3

key

repeatedly

adjust

R229

to

obtain

the

following

value.

A

:

B

=

2

:

1

Key

ON

Key

OFF

Accomp.

strings

signal

Oscillo¬

scope

CP

Board

R228

Key

split:

1

Accomp.

string:

MAX.

Turning

ON

A2

key

adjust

R228

so

that

C

is

equal

to

D.

Tremolo

speed

Frequency

counter

RS

Board

R521

Junction

of

R446

&

R447

Brass

VCF

cutoff

Oscillo¬

scope

or

AC

valve

voltmeter

RS

Board

R520

AUX

OUT

L-ch

Solo

VCF

cutoff

frequency

Oscillo¬

scope

or

AC

valve

voltmeter

RS

Board

R321

AUX

OUT

L-ch

SoloVCA

cutoff

level

Oscillo¬

scope

RS

Board

R320

AUX

OUT

L-ch

Tremolo

SW:

ON

Orchestra

volume:

MAX.

Solo

volume:

MAX.

Solo

volume:

MAX.

Adjust

R521

for

6.6

Hz.

Turn

R520

counterclockwise

to

open

VCF

and

turn

C4

key

ON,

too,

to

measure

the

value

of

level.

Then

turning

C6

key

ON

in

the

same

con¬

dition,

adjust

R520

to

obtain

the

same

value

as

the

former.

Turn

R320

fully

counterclockwise

(con¬

tinuous

sound

can

be

heard

even

in

key

OFF

condition,

then

turn

R321

counter¬

clockwise

(VCF

open).

Turn

E2

key

ON

and

measure

value

of

the

level.

Then,

holding

C6

key

turned

ON,

adjust

R321

to

obtain

the

same

value

as

the

former.

Turning

on

A6

key

repeatedly,

adjust

R320

to

obtain

the

following

value,

i

E

:

F

=

2

:

1

10

JVC KB-700 User manual

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