Nakamichi 620 Manual de usuario

‘=

620

Power

Amplifier

Operating

Instructio

WARNING

PREVENT

FIRE

SHOCK

HAZARD,

NOT

EXPOSE

THIS

APPLIANCE

RAIN

MOISTURE

Please

record

the

Model

Number

and

Serial

Number

the

space

provided

below

and

retain

these

numbers.

Model

Number

and

Serial

Number

are

located

the

rear

panel

the

unit.

Model

Number

Nakamichi

620

Serial

Number

CONTENTS:

Control

FUNCTIONS

—..-.-.eecsceeececereeeees

1,2

PrECAUtIONS

—-evreeeeeteeerceereeceererereereereeesees

CONNECTIONS

vsere-seeseeeeeeereeetereescrreeeenenscees

Using

the

620

---s--sscsssssesseesssenecenteseesnes

Block

Diagrams

—-srsssssssserssereeeeeesesestees

Troubleshooting

Chart

—-v--ssseseseee

Performance

Data

ccrrrerstereccereeeeeseeseeees

Specifications,

Accessories

+--+

thank

and

congratulate

you

for

purchasing

this

Nakamichi

620

Power

Amplifier.

you

are

Nakamichi

customer,

will

surprise

you

that

you

own

one

the

very

best

power

amplifiers

available

now

and

for

many

years

come.

the

620

your

first

Nakamichi,

hope

wil!

lead

you

understanding

our

underlying

philosophy:

create

only

those

products

that

only

Nakamichi

can

create.

ensure

that

you

fully

realize

the

capabilities

your

620,

ask

that

you

carefully

read

this

manual

its

entirety

before

attempting

operation.

NAKAMICHI

RESEARCH,

INC.

Control

Functions

Woy

2400

50/G0HE

{@ebm)

Vohege

———.

PRIMARY

FUSE

———

POWER

CORD

Precautions

Since

the

620

capable

delivering

momentary

power

levels

250

watts

per

channel

into

ohm

Loud-

speakers,

strongly

advised

that

you

observe

the

following

precautions:

Make

sure

that

the

Power

the

620

“off”

before

attempting

any

the

interconnections.

The

620

has

been

designed

with

power

supply

tremendous

energy

storage

capacity

for

superb

low

fre-

quency

performance.

The

power

supply,

therefore,

may

continue

energize

the

620’s

amplification

cir-

cuits

for

long

five

minutes

after

the

power

has

been

turned

off.

in-

put

connections

the

620

are

altered

immediately

after

turning

off

the

power,

disconnect

the

loud-

speakers

first.

Although

the

620

fully

protected

against

short-circuited

outputs,

take

care

avoid

shorting

the

output

wires.

prolonged

short

circuit

will

cause

excessive

heat

dissipation.

Connections

Preamplifier

Control

Amplifier

Using

standard

phono

plug

type

stereo

connecting

cable,

connect

the

preampli-

fier

output

the

Input

jacks

the

rear

panel

the

620.

the

620

used

with

the

Nakamichi

610

Control

Pre-

amplifier,

utilize

the

“Monitor

Out”

jacks

the

610.

Loudspeakers

Connect

the

left

and

right

loudspeakers

the

appropriate

terminals

the

rear

panel

the

620.

NOTE:

(1)

Observe

the

polarity

the

power

amplifier

and

loudspeaker

termi-

nals.

Both

loudspeakers

should

connected

the

exactly

same

man-

ner.

(2)

Although

the

620

virtually

unaf-

fected

small

capacitances

and/or

resistances

its

outputs,

overall

loudspeaker

performance

may

slightly

degraded

the

use

light

gauge

speaker

wire.

Heavy

duty

speaker

wire

highly

recommended.

RM-610

Remote

Control

Unit

Remote

selection

three

loud-

speaker

pairs

becomes

possible

when

the

620

used

conjunction

with

the

Naka-

michi

610

Control

Preamplifier

and

the

RM-610

remote

control

unit.

Refer

the

610’s

Operating

Instructions.

Caution:

The 620

has

been

designed

operate

into

load

impedances

ohms

greater.

Make

sure

that

the

loudspeaker

im-

pedance,

the

combined

equivalent

impedance

any

loudspeaker

combination

for

either

channel,

ohms

higher.

RM-610

Remote

Control

Unit

Nakamichi

620

Power

The

Power

Cord

the

620

may

plugged

into

the

switched

outlet

the

preamplifier

control

amplifier

use.

this

manner,

leaving

the

power

switch

the

620

“‘on’”’

the

Power

the

620

will

controlled

the

Power

Switch

the

preamplifier.

Make

sure

that

the

switched

outlet

the

preamplli-

fier

rated

300

higher

(the

620

may

connected

one

the

auxiliary

outlets

the

610).:

Nakamichi

610

Loudspeaker

System

Loudspeaker

System

Loudspeaker

System

Loudspeaker

System

ro"

FT]

Nakamichi

610

Q@9e9o

e000

Nakamichi

620

There

are

controls

that

need

adjusted

the

620.

normal

use

all

adjustments,

such

listening

level

channel

balance,

are

made

with

the

con-

trols

the

preamplifier

control

amplifier.

The

only

features

the

front

panel

the

620

are

indicator

lamps

inset

into

the

heat

sink

fins.

The

pilot

lamp

the

right

will

glow

orange

when

the

power

the

620

turned

on.

The

two

Peak

Power

Indicating

Lamps

the

left

will

glow

green

and

red

show

that

certain

output

power

levels

have

beer

re-

ached.

The

power

points

which

these

lamps

will

glow

can

preset

using

the

Power

Indicator

Threshold

Selector

Switches

the

rear

panel

the

620.

The

switch

marked

“Low”

sets

the

point

which

the

lamps

will

glow

green.

The

choices

are

and

Watts

(ref.

ohm

load)..

The

switch

marked

“High”

sets

the

red

indication

for

25,

““Max’’

Watts

(ref.

ohm

load).

When

the

latter

switch

set

for

“Max”,

the

red

will

indicate

amplifier

clipping,

which

will

occur

110

130

Watts

per

channel

with

ohm

load.

both

switches

are

set

for

Watts,

the

Peak

Power

Indicator

Lamps

will

glow

red

only

that

power

point.

Set

the

“Low”

and

“‘High’’

Threshold

Selector

Switches

required

for

normal

listening

levels.

For

example,

red

may

set

show

power

level

which

most

closely

approximates

the

peak

power

handling

capacity

the

loudspeakers.

Green

can

set

indicate

inter-

mediate

power

level

that

frequently

reached

normal

listening.

NOTE:

(1)

(2)

The

power

level

indications

the

Threshold

Selector

Switches

are

ac-

curate

only

for

ohm

load.

ohm

loudspeaker

used,

divide

the

indicated

power

levels

two.

Load

impedances

between

and

ohms

will

also

require

minor

correction

the

indications

that

the

actual

power

levels

will

slight-

higher

than

the

preset

indications.

The

Peak

Power

Indicating

Lamps

are

extremely

fast

responding

transient

signals.

0.1.

millisecond

power

pulse

will

cause

the

peak

in-

dicator

light

and

stay

“on”

for

0.3

second

that

the

peak

can

readily

observed.

These

lamps

are

Using

the

620

capable

responding

power

“spikes’’

that

escape

measurement

the

best

peak

reading

meters.

not

surprised,

therefore,

the

Red

Clipping

Indicator

(i.e.

when

the

‘“‘High’’

threshold

switch

set

for

Max")

comes

frequently

than

expected.

Momentary

clipping

this

nature

does

the

amplifier

and

loudspeakers

harm.

The

620’s

overload

characteristics.

are

such,

furthermore,

that

transient

clipping

impossible

detect

ear

with

the

vast

majority

program

materi-

al.

This

why

the

Peak

Power

Indi-

cator

Lamps

were

designed

into

the

620.

Block

Diagram

output

©)

(5A)

100W

80hm

volt

power

select.

supply

Condition

Troubleshooting

Chart

Probable

Cause

Remedy

nnntnn

gsnnEsgsnn

ann

power.

Power

switch

off.

Fuse

blown.

Make

sure

rear

panel

Power

Switch

on.

Replace

primary

fuse

with

fast

acting

fuse

for

220/240

use).

output.

Poor

input

connections.

Poor

loudspeaker

connections.

Check

all

connections

from

preamplifier.

Check

all

speaker

wire

termina-

tions.

Channels

reversed

one

channel

dead.

Improper

input

connections.

Improper

loudspeaker

wiring.

Correct

input

wiring.

Correct

loudspeaker

wiring.

peak

power

indications.

Inappropriate

threshold

settings.

Reset

Threshold

Selector

Switches.

nnn

TES

Note:

The

620

equipped

with

thermal

protection

circuit

which

protects

the

unit

from

damage

caused

excessively

high

operating

temperatures.

The

circuit

will

‘disconnect

the

power

the

amplifier

when

the

output

transistors

reach

operating

temperature

80°C

(176°F).

“This

rarely

occurs

under

normal

use

with

loudspeakers

rated

ohms

higher,

but

accidental

short

circuit,

for

example,

may

cause

the

protection

circuit

shut

down

the

amplifier.

the

event

that

the

protection

circuit

activated,

turn

down

the

volume

control,

and

turn

off

the

power

switch.

Check

all

wiring

make

sure

there

are

short

circuits.

The

protection

circuit

will

automatically

reset

once

the

amplifier

has

cooled

safe

temperature.

SERVICE

INFORMATION

Please

read

all

Notices

and/or

Warranty

Cards

included

with

this

unit.

Although

unlikely

that

your

620

will

require

repair,

should

servicing

ever

be-

come

necessary,

please

refer

all

such

work

qualified

personnel.

there

are

user

serviceable

parts

inside

the

unit,

please

not

attempt

your

own

repairs.

Thank

you

for

your

confidence

Naka-

michi

products.

Performance

Data

Output

Total

Harmonic

Distortion

1kHz

eee

1OKHZ

Frequency

Total

Harmonic

Load

imp:

ohms

Distortion

400Hz

H.P.

Output:

100

Watts

Constant

80kHz

L.P.

Load

Imp:

ohms

HHH

LTH

tH—t-H

Total

Harmonic

Distortion

(%)

[o>]

Total

Harmonic

Distortion

(%)

iil

Coon

100

10k

Output

Power

(Watts,

Frequency

(Hz)

Output

Harmonic

Distortion

Frequency:

1kHz

Output

Power

Distortion

Load

Imp:

ohms

60Hz

7kHz

(4:

Distortion

(%)}

Distortion

(%)

4610

100

Output

Power

(Watts)

The

distortion

data

immediately

above

was

obtained

with

the

aid

Bruel

Kjaer

3348

Real

Time

Analyzer.

These

measurements

cannot

made

with

conventional

distortion

analyzers

because

noise

factors.

100

Output

Power

(Watts)

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