Altec Lansing 1270 Manuel utilisateur

LANSING

1270

POWER

AMPLIFIER

OPERATING

INSTRUCTIONS

user-serviceable

parts

inside.

Hazardous

voltage

may

en¬

countered

within

the

chassis.

Installation

and

Service

information

within

this

document

for

use

only

ALTEC

sound

contractors,

factory

authorized

warranty

stations

and

qualified

service

personnel.

est

enjoint

Tutilisateur

pas

reparer

lui-meme

les

pieces

IMPORTANT:

’

„

internes

appareil,

des

courants

haute

tension

pouvant

pas¬

ser

I'interieur

chassis.

Les

renseignements

inclus

dans

document

son

destines

uniquement

I'usage

des

installateurs

agrees

des

systemes

acoustiques

ALTEC,

des

centres

reparation

sous

garantie

autorises,

ainsi

que

personnel

d'entretien

qualifie.

INTRODUCTION

The

ALTEC

LANSING

Model

1270

Power

Amplifier

provides

continuous

high

power

demand

where

uninterrupted

operation

requisite.

Designed

protect

itself

and

the

acoustic

elements

drives,

the

Model

1270

represents

800

watts

controlled

power.

Two

channels

may

operated

independ*

ently,

parallel

bridged

configuration

deliver

400

watts

per

channel

less

than

0.05%

THD

from

kHz.

Peak

Error

Computer

The

amplifier

provided

with

peak/error

computer

that

compares

channel

input

and

output

signals

and

detects

any

output

errors.

Detection

any

peak/error

causes

the

appropriate

peak/error

indicator

illu¬

minate.

Output

anomalies

detected

include

excessive

voltage,

excessive

current

(load),

excessive

slew

rate,

and

any

other

signifi¬

cant

difference

between

the

channel

input

and

output

signal.

Amplifier

Protection

The

amplifier

output

continuously

mon¬

itored

guard

against

excessive

current

drain.

instantaneous

limiter

restricts

output

400

±45°

phase

shift.

The

amplifier

additionally

protected

against

excessive

operating

temperature;

logic

cir¬

cuitry

automatically

overrides

low-speed

fan

operation

and

locks

the

high

fan

speed

mode.

operating

temperature

remains

excessive,

the

load

discon¬

nected

relay

and

the

protection

indica¬

tor

illuminates.

When

temperature

falls

safe

operating

conditions,

the

amplifier

automatically

resumes

operation.

Load

Protection

The

load

protected

from

transients

dur¬

ing

startup

and

shutdown

the

amplifier.

During

startup,

the

load

remains

discon¬

nected

through

relay

during

three-

FRONT

PANEL

CONTROLS

AND

FEATURES

second

delay

period.

During

shutdown

loss

power,

the

load

instantaneously

disconnected

the

relay.

The

load

simi¬

larly

protected

against

amplifier

failure,

such

voltage

the

output.

Item

Name

Function/Description

Peak/Error

Indicators

Protection

Indicator

POWER

Indicator

POWER

Switch

CHANNEL

Volume

Controls

Illuminate

when

excessive

voltage,

current

slew

rate

ap¬

pears

the

output

terminals.

Illuminates

when

protection

circuitry

operates

prevent

dam¬

age

the

amplifier

load.

Illuminated

when

primary

power

applied

the

amplifier.

Applies

primary

power

the

amplifier.

Adjust

gain

LEFT

and

RIGHT

channels.

Rotate

clockwise

increase

gain.

ALTEC

LANSING

Specifications

and

components

subject

change

without

notice.

Overall

performance

will

maintained

improved.

1515

Manchester

Ave.,

Anaheim,

Calif.

92803

42-02-045589-01

LITHO

U.S.A.

681-1M

INSTALLATION

Rack

Mounting

The

1270

may

installed

standard

19-inch

equipment

rack,

the

42526

Shelf

Mount

Cover

Accessory

for

shelf

use.

Vertical

space

required

ViRack

instal¬

lation

accomplished

using

the

appro¬

priate

four

mounting

screws

supplied.

Ventilation

The

1270

must

adequately

ventilated

prevent

excessive

temperature

rise.

Max¬

imum

rated

ambient

operating

temperature

55°C

(131

°F).

CAUTION

not

block

the

side

ventilation

aperatures

either

side

the

main

frame.

Allow

least

each

side

the

main

frame

assure

adequate

ventilation.

not

operate

within

completely

closed,

unventilated

housing.

ELECTRICAL

120

Volt,

50/60

Power

Connections

Equipment

supplied

for

domestic

use

provided

with

the

power

transformer

primary

strapped

for

120

volts.

Specified

voltage

rating

located

the

chassis,

adjacent

the

power

cord.

Verify

that

line

voltage

accordance

with

specified

volt¬

age

before

connecting

the

1270

line

power.

100V,

200V,

220V,

240V,

50/60

Power

Connections

Refer

Authorized

Altec

Service

Representative.

Input

Connections

Unbalanced

input

connections

the

INPUT

jacks

are

made

with

shielded

single¬

conductor

cables

terminated

with

standard

V4-inch

phone

jacks.

preparing

the

cable,

the

conductor

soldered

the

tip

the

jack,

and

the

shield

soldered

the

sleeve.

REAR

PANEL

CONTROLS

AND

FEATURES

Item

Name

Function/Description

OUTPUT

Terminals

Connect

left

(L)

and

right

(R)

channels

corresponding

speak¬

ers.

Two

pair

standard

jacks

have

red

(+)

and

black

(-)

polarity

designations.

INPUT

Receptacles

cables

from

high

impedance

(nominal

15,000

ohms)

sources.

Use

standard

ring

and

sleeve

plug

for

left

(L)

and

right

(r)

receptacles.

LINE

Receptacles

cables

connect

other

Altec

Amplifiers

parallel.

Use

standard

ring

and

sleeve

plug

for

left

(L)

and

right

(R)

receptacles.

BRIDGE/

NORMAL

Switch

Connects

internal

circuitry

for

independent

mono

operation

(NORMAL)

into

4-ohm

load,

bridge

operation

(BRIDGE)

into

ohms.

COM

Terminal

Provides

connection

circuit

common.

GND

Terminal

Provides

connection

chassis

ground.

FAN

Switch

Selects

low

(1)

high

(2)

fan

speed.

Fuse

Protects

amplifier

from

excessive

current

drain.

Replace

only

with

same

type

10-ampere

fuse.

Refer

qualified

service

per¬

sonnel

fuse

blows

repeatedly.

Balanced

input

connections

are

made

with

the

optional

1270TM

Dual

Balanced

Trans¬

former

Input

Module.

Plug

the

1270TM

into

the

INPUT

receptacles

the

1270

and

secure

the

retaining

screw.

See

Figure

Cables

terminated

with

XLR3-type

connec¬

tors

are

used

make

input

connections

the

1270

module;

wiring

for

the

XLR3-

type

connector

shown

Figure

SCREW

TRANSFORMER

MODULE

RECEPTACLES

MODULE

JACKS

INPUT

1b.

Module

Installed

Figure

Installation

1270TM

Module

Figure

Wiring

for

XLR3-type

Connector

Line

Out

Connections

LINE

OUT

receptacles

are

made

with

shielded

single-conductor

cables

terminated

with

standard

Vi-inch

phone

jacks.

When

channels

are

operated

independently

(stereo

operation)

cable

must

connect

each

channel

each

addi¬

tional

1270

amplifier

connected

multiple.

When

channels

are

operated

the

bridge

mode,

only

the

left

channel

each

addi¬

tional

1270

requires

connecting

cable.

Output

Connections

Output

connections

are

made

the

and

OUTPUT

terminals.

Figure

illustrates

connections

for

independent

(stereo)

opera¬

tion

and

for

bridged

operation.

GND

and

COM

Connections

The

GND

(chassis

ground)

and

COM

(elec¬

trical

common)

terminals

are

used

cor¬

rect

unsatisfactory

grounding

conditions

and

for

establishing

desired

grounding

configurations.

—

OUTPUT

-0

3a.

Independent

Operation

and

Channels

NOT

CONNECTED

OUTPUT

NOT

CONNECTED

STEREO

(INDEPENDENT

CHANNEL)

OPERATION

After

installation

and

hookup

connec¬

tions

Figure

3A,

check

that

the

BRIDGE/NORMAL

switch

positioned

NORMAL,

and

that

the

LEFT

and

RIGHT

CHANNEL

volume

controls

are

turned

fully

counterclockwise.

(<»).

Set

input

signal

level

the

1270

nominal

value

0.775V.

Turn

line

POWER

switch

and

note

illumination

POWER

indicator.

Turn

LEFT

and

RIGHT

CHANNEL

vol¬

ume

controls

clockwise

until

desired

output

power

obtained.

either

LEFT

RIGHT

peak/error

indicator

illumi¬

nates,

reduce

output

level

with

channel

volume

control

reduce

input

level

1270.

CAUTION-

Bridged

operaton

provides

true

bal¬

anced

output.

not

connect

either

side

the

loudspeaker

line

audio

common

any

other

“ground”

connection.

3b.

Bridge

Operation

and

Channels

Figure

Output

Connections

BRIDGE

(MONO)

OPERATION

After

installation

and

hookup

connec¬

tions

Figure

3B,

check

that

the

BRIDGE/NORMAL

switch

positioned

BRIDGE,

and

that

the

LEFT

and

RIGHT

CHANNEL

volume

controls

are

turned

fully

counterclockwise

(<»).

Set

input

signal

level

the

left

(L)

INPUT

the

1270

nominal

value

0.775V.

(The

right

(R)

INPUT

left

unconnected.)

Turn

line

POWER

switch

and

note

illumination

POWER

indicator.

Turn

LEFT

CHANNEL

volume

control

clockwise

until

desired

output

power

obtained.

sure

leave

RIGHT

CHAN¬

NEL

volume

control

fully

counterclock¬

wise.

LEFT

peak/error

indicator

illu¬

minates,

reduce

output

level

with

LEFT

CHANNEL

volume

control,

reduce

input

level

the

1270.

—

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