Korg Sdd-1200 User manual

DUAL

DIGITAL

DELAY

SDD-1200

SERVICE

MANUAL

r

CONTENTS

1.

SPECIFICATIONS 2

2.

STRUCTURAL

DIAGRAM

3

3.

BLOCK

DIAGRAM

4

4.

CIRCUIT

DIAGRAM

5

5.

P.C.

BOARD

6

6.

CIRCUIT

DESCRIPTIONS

7.

CHECK

AND

ADJUSTMENT

PROCEDURE

8.

PARTS

LIST

.10

.14

r

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1.

SPECIFICATIONS

0

-

+110%

(positive

phase)

0

110%

(negative

phase)

]

Filter

(EFFECT

sound)

HIGH-CUT

10kHz

0

18dB,

changes

in

succession

LOW-CUT

100kHz

0

18dB,

changes

in

succession

i

Modulation

MODULATION

WAVEFORM

triangle

waveform

MODULATION

FREQUENCY

0.05

-

8Hz

DELAY

TIME

MOD.

RANGE

4

:

1

SAMPLING

FREQUENCY

42kHz

(FACTOR

=

x1)

-

170kHz

(FACTOR

=

x0.25)

METHOD

12bit

quantitized

+

analog

logarithm

compression

M

Dimensions

482

(W)

x

44

(H)

x

340

(D)

mm

M

Weight

4.2

kg

M

Power

supply

100V

50/60HZ

M

Power

consumption

11W

M

Supplied

accessories

AC

cord.

Rack

mounting

screws.

SH

Optional

accessories

pedal

switches

(PS-1,

PS-2),

patch

cord

sets

(A,

B,

C),

IU

rack

case

(HC-IU)

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2.

STRUCTURAL

DIAGRAM

c

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3.

BLOCK

DIAGRAM

LOW

CUT

LPF

COMPRESSOR

m.

.y

■,

LPF

EXPANOOR

HI

CUT

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D101-D111;

1SS133T77

This

circuit

diagram

shows

KLM-6000

A

channel

only.

The

circuit

or

KLM-6000

B

channel

is

quite

same

as

A

channel

except

silk

part

number

on

the

board.

Parts

number

of

A

channel

100-199

Parts

number

of

B

channel

200-299

M5224

i

!-!5vl

>'

8

IC107

l/4

0I03V

—>

?

CI46

V2

^

I

it

!

I

T

i

1

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KLM-6000

MAIN

BOARD

A

B

A

B A

B

cjvw

T

I.

^

S

tJS

S

fcX?

g

o/S"

<J?

^/

*

^*

h0hD/rR.G)B^O

1KLM-6O17

^

I

KLM-6001

PANEL

BOARD

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5.

P.C.

BOARD

KLM-6000

knae

saoAi

ivj

KHN-eOOOB

Ot

tiKE

BEWVCE

OMFA

MUH

06

HETC

lAbE

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KLM-6001

KLM-6001,

2,

3,

4,17,18

KLM-6003,

2,17

©

c

_ED

I

LgQ2

KLM-6002

AC

CMB

BW

CN1

CAUTION

FOR

CONTINUED

PROTECTION

AGAINST

THE

RISK

OF

FIRE

REPLACE

ONLY

WITH

SAME

TYPE FUSE

ATTENTION

UTILISER

UN

FUSIBLE

DE

RECHANGE

DE

MEME

TYPE

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6.

CIRCUIT

DESCRIPTIONS

1.

SYSTEM

EXPLANATION

The

SDD-1200

is

a

Dual

Digital

Delay

that

includes

KORG's

custom

LSI

UPD65010CW-133

(Gate

Array)

and

consists

of

2

independent

systems.

Since

using

two

dynamic

RAM

of

256K

bits

(4

bits

x

64

words

for

each

unit),

there

is

totally

128K

words.

It

uses

12

bits

(3

words)

per

sampling.

That

is,

if

the

sampling

fre

quency

is

42.66KHz,

SDD-1200

provides

a

maximum

delay

time

of

1024msec.

2.

MAIN

CIRUIT

EXPLANATION

■SIGNAL

INPUTS

The

audio

signal

input

to

INPUT

A

is

buffered

at

FET

(F101),

and

adjusted

to

the

adaquete

level

by

INPUT

LEVEL

VR

(VR1)

on

the

front

panel,

and

then

amplified

about

4

times

as

much

by

OP

AMP

(1/2

IC101).

This

signal

goes

through

the

MIXER

(1/2

IC101)

mixing

with

Feedback

Input,

and

the

mixed

signal

is

filtered

by

the

FILTER

(fc

=

16KHz),

consists

of

transistors

(Q101, Q102),

then

compressed

at

Compressor

Circuit,

consists

of

Compressor

(1/2

IC107)

and

OP

AMP

(1/2

IC106),

and

pre-emphasized

by

CR

which

consists

of

C132,

R153andR154.

The

output

signal

from

Compressor

Circuit

goes

through

the

S/H

Circuit,

which

consists

fo13700

(1/2

IC111)

and

FET

(F105)

and

digitalized

at

the

A/D

Converting

Comparator

(IC110).

Then

it

inputs

to

Gate

Array

(IC112)

as

digital

data.

[Note?

f

11.

IC

13700

is

a

high-speed

analog

switch

controll-!

[

ed

by

the

signal

from

SH

terminal

of

the

Gate

Ar-i

I

ray.

The

frequency

of

the

signal

is

the

sampling

I

frequency.

I

[2.

Most

part

of

the

circuit

to

convert

S/H

signal

from!

i

analog

to

digital

is

in

the

Gate

Array.

Only

high-i

|

speed

Comparator

(IC110)

is

in

external.

'

I

SIGNAL

OUTPUT

The

effect

signal

conducted

at

the

Gate

Array

out

puts

from

D00

-

D011

of

the

Gate

Array

(IC112)

as

a

12-bit

digital

data

and

converted

to

analog

data

by

the

Block

Resistor

(RA101),

which

consists

of

R-2R,

and

goes

through

the

S/H

Circuit,

which

consists

of

13700

(1/2

IC111)

and

FET

(F106).

Then

it

goes

through

LPF

(consists

of

Q103)

to

eliminate

the

clock

signal

used

for

sampling,

then

pass

through

Expander

Circuit,

which

consists

of

expander

(1/2

IC107),

and

OP

AMP

(1/2

IC106)

to

bring

the

compressed

dynamic

range

back

to

nor

mal.

This

signal

is

output

after

passing

through

the

Filter

Circuit

(Hi-cut,

Lo-cut)

and

Output

Mixer

Cir

cuit.

ICONTROL

Since

a

normal

Rotary

VR

is

used

for

selecting

Delay

Time

range

(2ms,

8ms,

32ms,

128ms,

512ms,

1024ms),

the

Range

Selecting

Circuit

con

sists

of

Compators

(IC

109,

IC108).

See

below

for

details.

To

prevent

noise

when

unit

is

turned

on

or

when

the

delay

time

is

changed,

the

Gate

Array

outputs

mute

signal.

MUTE...for

stopping

S/H

"H"

is

active

MUTB...for

stopping

Expander

"L"is

active

Clock

Oscillation

Circuit

consists

of

74HC00

(IC113)

and

oscillates

32

times

faster

than

the

Sampling

Frequency.

A

transistor

(Q105)

is

used

as

Fixed

Current

Circuit)

to

change

frequency

logarithmically

by

linear

control

voltage

(signal

modulated

by

Factor

+

Modulation).

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7.

CHECK

AND

ADJUSTMENT

PROCEDURE

1.

Power

Supply

Voltage

Check

Connect a

Digital

Volt

Meter

(DVM)

to

TPs

on

KLM-6000

and

confirm

if

the

voltage

at

each

test

point

is

within

the

ranges

as

shown

below.

2.

Modulation

Check

The

settings

are

as

follows.

Mode

Sw.

=

separate

1)

Modulation

Connect

an

Oscilloscope

(DC

2v/div,

50ms/div)

to

TP-6A

and

TP-6B

on

KLM-6001

and

confirm

modulation

waveform

refering

to

the

chart

below.

Fig.

1 (DC

Changes)

Fig.

2

(Amplitude

changes)

Fig.

3

(Frequency

changes)

2)

Modulation

LED

lighting

Adjust

the

FREQ

volume

of

UNIT

A

and

B

to

"5",

and

check

each

LED

by

following

procedure

below.

©

Mode

Sw.:

IN

PHASE

Add

modulation

on

both

channels

and

confirm

if

both

are

syncronized

in

same

phase.

(2)

Mode

Sw.:

SEPARATE

Confirm

if

the

modulation

on

each

unit

is

controlled

independently.

<3>

Mode

Sw.:

OUT

PHASE

Add

modulation

on

both

channels

and

confirm

if

both

are

syncronized

in

inverted

phase.

10

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3.

Muting

Effect

Check

1)

Power

On

Mute

Confirm

if

POWER

LED,

BYPASS

LED

A

and

B

are

lit

3.5

seconds

(±1

second)

later

when

the

unit

is

turnd

on.

2)

Muting

Effect

at

delay

time

change

Set

as

above

and

supply

1

KHz,

-24dBm,

sine

wave

for

Standard

Signal

Generator

(SG)

to

SDD-1200,

and

observe

MIX

OUTPUT

with

an

Oscilloscope

(DC

0.5v/div,

5ms/div).

to

confirm

if

Mute

effects

on

sounds/waveform

(fig.

4)

when

delay

time

is

changed.

Fig.

4

4.

S/N

Check

Set

as

above

and

connect

a

Noise

Meter

(1HF-A

filter

-80dBm)

to

MIX

OUTPUT.

And

check

S/N

refering

to

the

chart

below.

11

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5.

Clock

Check

and

Adjustment.

Set

as

above,

then:

1)

Set

FACTOR A

to

xO.25

2)

Connect

a

FREQUENCY

COUNTER

to

TP-4A

on

KLM-6000

and

confirm

if

the

value

is

170.64KHz

±8KHz.

3)

Adjust

VR105

if

necessary.

4)

Set

FACTOR

A

to

x

1

and

confirm

if

the

value

is

42.66KHz

±2KHz.

5)

Adjust

VR104

if

necessary.

6)

Change

FACTOR

A

from

x

0.25

to

x

1

to

confirm

if

the

value

are

in

the

range

specified

as

above.

Repeat

2)

-

4)

till

you

get

correct

value.

7)

Do

the

same

adjustment

for

UNIT

B

usnig

VR204

and

VR205.

~

ir

Note:

]

i

Above

values

are

for

under

20°C.

In

case

of

0°

'

!

-40°C,

±10%

deviation

is

allowable.

6.

Analog

Compressor/Expnder

Check

and

Adjustment.

Set

as

above,

then:

1)

Input

a

Tone

Burst

wave

(400Hz,

-40dBm,

sine

waveform)

to

SDD-1200

UNIT

A

and

confirm

waveform

(fig.

5)

with

an

Oscilloscope

(DC

0.5v/div,

10ms/div)

connecting

to

MIX

OUTPUT.

2)

Confirm

if

the

DC

fluctuation

of

*3

shown

in

Fig.

5

is

minimized.

Adjust

VR102

on

KLM-6000

if

necessary.

3)

Confirm

if

the

linearity

of

*2

shown

in

fig.

5

is

almost

linear.

Adjust

VR103

on

KLM-6000

if

necessary.

12

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4)

Do

the

same

adjustment

for

UNIT

B

with

VR202

and

VR203.

r

L.

Notel:

Distortion

in

the

EFFECT

OUTPUT

increases

if

adjust

ment

2)

and

3)

are

not

correct.

Note

2:

If

you

have

a

Distortion

Meter,

you

can

confirm

distortion

ratio

as

shown

below

by

inputting

sine

wave

of

400Hz,

-10dBm

to

SDD-1200

UNIT

A.

1)

DIRECT

VR

0,

EFFECT

VR

10:

Distortion

ratio

=

less

than

0.5%.

2)

DIRECT

VR

10,

EFFECT

VR

0:

Distortion

ratio

=

less

than

0.05%

7)

Feedback

Check

and

Adjustment.

Set

as

above,

then;

1)

Input

sine

waveform

of

400Hz,

-24dBm

form

a

Standard

Signal

Generator

(SG)

to

SDD-1200.

2)

Confirm

if

it

does

not

feedback

when

FEED

BACK

VR

is

set

to

±8

and

feedbacks

at

±

10.

3)

If

necessary

adjust

VR101

for

UNIT

A

and

VR201

for

UNIT

B.

Note:

;

If

each

value

of

plus

and

minus

is

different,

you

can

i

use

the

one

that

is

easier

to

feedback.

[

1

4)

Set

the

input

signal

to

"0"

and

confirm

if

it

does

not

feedback

when

FEEDBACK

VR

is

set

to

±10.

13

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KORG

INC.

15-12,

Shimotakaido

1-chomet

Suginami-ku,

Tokyo,

Japan.

©KORG

INC.

1986

6109

CGH

Printed

in

Japan

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Korg SDD-1200 User manual

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