JBL 7510B User Manual

BEFORE

PLEASE

PROCEEDING WITH

COMPLETE

READ THE SECTION ON

OBL

UNPACKING

UREI

ELECTRONIC

PRODUCTS

INSPECTION

AND

SETUP

model

AUTOMATIC

JBL

8500

NORTHRIDGE, CA.

BALBOA

PHONE:

TELEX:

JBL

Ifetls^bMER

751

OB

MICROPHONE

Incorporated

BOULEVARD

2200

BOX

P.O.

91329

818

(

PROPEeSldNAL

893-8411

)

4720424

MIXER

USA

H .

1

©Copyright

1988,

JBL

8370

3^POA.BOULEVAFD

5-

NORTHRIOGE,

^RQNE

FAXtsisj 891-9619

Incorporated

m,

(818)

0

132,9.

893-8411

S

U.SJV;

A.

Manual

751

OB

Section One

.refac

J.JL...P

Thank

achieve optimum

and

read

on our products and

This manual is

our

products

Unpacking

1

.2

Your new

designed to protect the unit during shipment

shipping carton and

If

damage is

carrier

e

purchasing this JBIVUREI product We

for

you

make

to

dedicated

in

order

JBL/UREI

evident

of

possible

a

The shipping

The JBL/UREI

utility and

of the

use

performance

material contained in this manual. We welcome your suggestions and comments

on this manual.

all

to

to best use

Inspection

and

Automatic

its contents

not

do

claim

carton

destroy

for damage. Damage

should

Model

from

the people

them.

who

Learn, Enjoy

Microphone Mixer was carefully packed at the factory,

for

sign

any

contain:

7510B

of

Automatic

introdUCliOD

have prepared

new

your

are interested

Nevertheless,

of physical damage

packing material or

the

claims

Automatic

Share.

and

must

Microphone Mixer

Microphone Mixer.

in learning

this instruction manual

the capabilities and limitations

about

to

enable

We encourage

and the container was

we recommend careful examination of the

be

which

the

made

by you.

may

carton,

have

occurred in transit

and immediately notify

you to

you

the

to

of

Instruction Manual

This

An

envelope containing Rack Mounting Hardware

If

1.3 About

The

diagrams

connectors

Installation,

Note: In this manual, unless otherwise specified,

milliwatt in a

this_Mamjal

of

(derating

have purchased extra

you

and information on the following two pages provide an overview

Model

the

circuit with

lOB Automatic Microphone Mixer. Additional

75

Instructions, and

load impedance

a

7510-03

Theory

of 600 ohms.

Input Expander

of Operation

sections.

0 dBu is equivalent

Assemblies, they are separately

the

of

detailed information follows

to 0.775

volts and

controls, indicators and

0 dBm is one

packed.

in the

Page

1

1.4 Front Panel

Manual

751

OB

A. Input

Adjust

from

Gain Control

compensate

to

different talkers,

source-to-microphone

Release

B

Screwdriver adjust

before an

delay

Fastest

CW to

C.

release

avoid channel

Threshold

Screwdriver adjust

required to

signal

Priority modes.

or

with the

CCW

threshold threshold is also

control which

control

reduce

to

level

trimpot. Adjusts the

active channel is turned

is full CCW. Turn

trimpoL Sets

turn ON

The

full CW.

set

die sensitivity

the channel. Note that

of

)

affected by the input

should

D. Channel On LED

for different

microphones

distances.

turn-off

most

between

input

the

sensitive position is

Turn

( increase the

be set

first for

volume

and

time

OFF.

the control

words.

level

the

in

Automatic

the control

gain

mix balance.

level

of

the

‘

*

•"

’

2

(

^

0

AUTO

8

)

y

^

10

wiiomTv

9

^

A

Turns

excellent tool

of threshold

E. Mode Switch

Select ON to

whenever the

on

for checking for marginal settings

and release controls.

defeat the Auto

channel will always be

Select

AUTO

A channel

threshold

the

Select

AUTO

inputs

one or two

Too

been

PRIORITY

mode,

which are in the AUTO mode may

many

placed

choose the

to

will

turn ON

level.

to

will simultaneously turn OFF all inputs

but

inputs

to be

PMORITY

in

the ON mode.

channel

live.

when its

choose

in PRIORITY mode.

active.

is

function.

Mix

Mix function.

Auto

input exceeds

Priority function. The channel

channels defeats

An

The

turn ON wMe

PRIORITY

this purpose.

Figure 1 The Front Panel-Input Section

will turn ON under the same conditions

which

PRIORITY

a

mode

PRIORITY

live

are

input is live. Do not select more than

allows

mode does

in

and

one input

not affect channels

the AUTOmode. No other

take control of the

to

as

which

in

mixer.

have

Page 2

F. Master Gain

Manual

751 OB

This

level tom

Background Threshold Control

G.

full CCW click

At

individual

an

threshold

position

threshold varies

from

normal

the

is

the Main

circuit of that

of the

all

the

of

“background”

turning

increases the

input

turn ON.

H. Output

0

I. Power LED

J. Voltage Test Point

level

VU is

ON

a

must

calibrated to

Master mix control. It

OuQ)ut

position the

channel

is

Background

according

microphones

level rises, so

channel. CW

amount

by

exceed the

Meter

+4

fixed,

individual

Threshold

to

rotation of the control

which

“background”

dBm at the

threshold

and is

the

in

does

set

channel.

control, the

amount of

the system. As

threshold

the

individual channel

an

Main

controls output

for turning ON

only by

before it

Output.

the

In any other

signal sensed

the

for

will

For adjustment

Section

See

K. RTI-Background Preset

Section

See

RT2-Background

L.

Section

See

of background preset voltage

2.4.4.

Offset

2.4.4.

M. Power Switch

trimpot

trimpot.

.

and offset.

Figure

2

The

Front

Panel

-

Output

Section

Page

3

Manual

751 OB

Three pin XL

output. The

controlled

A 10

may be

ground.

signal to

the the the ring

amplifier

The

inputs.

This is a

Master

is 2

“+”

is

3

by

input on

kohm

wired

An input

summing

a

NOM

number of

circuit.

contact

just

level does

low impedance output

Gain

kohm.

connector.

style

pin 2

and

signal

level

front

Ae

a

either of two

wired

amplifier

Level,

brings

not

inputs.

to

vary with

active

prior

control.

Pin 1

of the

side

is

connector

this

from

Master

panel

3-conductor

ways.

contact

tip

the

to

under

therefore,

An input

signal

the

Master

to

the

another

Gain

number

prior

Minimum load

ground,

is

floating

control.

Gain

phone jack

Shield

varies

is

returns

control

with

wired

summing

control.

of active

the

to

impedance

is

of

to

connector is

This

7510B

Turn the

Phantom

You

switch, and

Hz,

the

15

mainframes.

switch ON to

Power to

can choose

grounded

"230"

position

cord

to a

connect

power source.

See

all inputs.

"115"

the

of

source,

the AC

power

240 VAC,

interconnecting two

for

Page 10

supply

+48 VDC

position of

cord

to a

or you

switch,

Hz,

50/60

120

grounded

the

VAC,

may

and

AC

60

choose

connect

Page

4

G. Input CoDPectof

Manual

751

OB

Thisisa

7510-03 Input

on

a

into the

tighten the

and

which

style

Assembly

12

holes

for

may be

Page 6.

H. Direct

A

600

conductor

7510B

output

Direct Outputs

Remote

I.

gain

The

changed

connector

Adjust

activation of

logic

Output/Patch

nominal

ohm

phone

is on the

follows

Control

each of

of

replacing the

by

with resistors

on Page

circuitry.

connector

indicated

as

screws.

ease

jack, return

ring

the circuit

Page 9.

on

7.

input is also

any

See

which serves

by

Strip

the

Assembly.

The connector is a

disconnected

wiring. See

of

0!^

-t-4

dBu ouQ)ut

the

to

and ground is

that turns the

Connector

the input

switch closure

A

Wiring of Logic

preamplifiers

wire jumpers

discussed

as

available

all four inputs

wires, insert

the

rear panel

from the

Input

is on

Input

Connections

the tip of the

summing

on the

sleeve. The

channel ON.

in

the

in Preamp Gain

ground upon

to

drive external

to

Circuits

silkscreen

two-piece

of the

buss

may

be

15

on Page

on

3-

See

7.

General

2.1

The following section

minimal reference

with

Installation

the

IMPORTANT—

Mixer,

operating

TTiis

Mixer.

please

understanding is

WARNING

gain

to

must be

2.2 Installation

access

exercised.

and

If

read

problems

:

many

In

internal

to

Setup

you

the short

These

Section Two Installation

contains installation and setup

areas of the

other

to

have

arise

phase

follows

never installed,

section on

because

important to

very

cases,

installation of the 7510B

circuit components.

instructions are

of an

manual.

immediately thereafter.

set

Theory

the

incomplete

ability

your

intended

information.

Supplemental

operated a

or

up

Operation before

of

incorrect understanding of

or

obtain

to

Automatic

Since dangerous

for

use by

Figure 4 The Rear

written in a step-by-step

It is

Information

Model

7510,

continuing.

which

7510A

how this product works.

the

qualified personnel only.

performance from this

best

Miaophone

voltages may

AC

Mixer involves opening

exist inside the

Panel

may

7510B

or

installation and

Most

-

Input

Section

procedure

of

use to you

be

Automatic

Automatic Mic

the unit

caution

unit,

in

Line

2.2.1.

the

voltage for which your

Check that

Voltage

Change

the

AC

Switch on

unit is

Voltage

rear

the

wired. The

at your

panel and

7510B

installation is correct

a tag

can

the AC

on

powered

be

power cord

from

the

Mixer.

which

Look at the

identify

for

either 100 to 120

the

VAC

position of

mains

AC

or 200

to

Page

5

Manual

751

OB

VAC,

240

operating

shipped,

As

1. Be

2.

3.

line cord

OB

NEMA

Canada. To

U.S. or

procedure:

751

a

Note

Listed

adaptor based

Caution

line

the

areas

WARNING:

CONNECTED

AND

or

50

60

range to

the unit is set for 100 to

sure the

the Supply

Slide

Install

a

uses a

5-15P plug

:

Any line cord or

or C.S.A.

:

This unit

voltage

within

mains.

Hz

the other.

convert the

7510B

suitable

standard

is supplied.

Certified.

governing local

on

may be

applied. Also,

the

U.S.,

Voltage

plug or adaptor to

DC

A SIGNIFICANT FIRE

TO AN

LABELLED.

The

Supply

120

for operation

unit

not connected to

is

Select

lEC 320

Cordsets to match

adapter

used

For 240 VAC,

regulations.

damaged

verify that

mains exist.

POWER

AC

Voltage

operation, and

VAC

Switch

mate

style AC

200-240

for

50/60

if

operated

the

AND

SOURCE

Select

with other

power

any

the

to

existing line

the

Switch

the

mains

source.

appropriate range.

the rear panel

on

line

cord provided is suitable

voltages or outlet

with the powCT receptacle. The

cord

Power Connector on the chassis. A

U.S.

FOR

available

or

other AC

Volt

Hz

with the Supply Voltage Select Switch

mains

SHOCK

OTHER

Mains

operation

are AC since,

outlets are

in

the

in other countries,

in

some countries

HAZARD MAY EXIST IF THE MIXER

THAN THAT

converts

types, use

matching

worldwide.

Canada

must

select a

set

well

as

WHICH IT

the

unit from

for use in

the

following

cordset

U.L.

be

line

cord or

incorrectly

certain

as

RATED

IS

one

the

with

for

IS

2.2.2. If you

inputs above four,

2.4.4

and

2.2.3. Rack

Microphone Mixer

+122®

F

to

unit is installed

If the

(such as

while internal

avoid

Caution:

completed.

be

2.2.4. Connect

whys,

Input

power

mounting the unit

The

turned

wherefores and how-to's

Connections

have additional 75

do

this manual.

of

mount

will

F

and

up to 80%

),

amplifiers), adequate ventilation should be provided to assure longest component life. Also,

circuitry

lOB

75

Also, any power

OFF

all

until

audio input and

The Input Connector is

quick and

gold contact

you

&

connector

easy

have not seen

which may

wire, needing only

to

material

this

10-03

Follow

now.

it

your

operate

Mixer

satisfactorily over

the

with the enclosed rack

non-condensing

in

equipment

an

susceptible to

immediately

power cord

AC

amplifiers

wiring

a

eliminate oxidation or

to

be

and setup

12

connector before, take

disconnected

rack, console or other area along

hum

adjacent to

should

output

wiring

of

connector

wire

from

Expansion Assemblies to

Input

instructions enclosed

with

mounting

range of ambient temperatures

a

relative humidity.

pickup

which

to

procedures have been completed.

wiring. The following discussions include a

the connectors.

which serves

strippers and

is sufficiently shielded

large power transformers, motors

not be

the Input Assembly

connected

Automatic

the

all

a small

corrosion of the contact surfaces

moment

a

to

the power receptacle

to

Microphone

four inputs on

screwdriver, and

examine

for

install,

the 7510-03,

hardware.

with high

from

a

it. You

ease of

wiring.

to

The Model

moderate electromagnetic fields,

Mixer

7510-03

in long

will

increase the number

or refer

Sections 2.4.3

to

7510B

0®

from

heat producing equipment

etc.

until

may

be

description of the

Input Assembly. It is

it

a reliable

is

term

notice that it is

polarized, and Ae

It is

+50®

C to

all

wiring

connect^

connector with

fixed installations.

of

Automatic

+32®

C

(

is

should

two-piece

a

Page

6

Manual

751 OB

latching

them.

although

AWG.

screws.

The Model

Phantom

not

Power

supplies

the nature

ON.

SWITCH IS

OR

Most

about

microphone

If none

Assembly

If

condenser

source is

series with the

751

to

mechanism

wires

The

may do

you

Strip tihe

7510B Automatic

Power gets

specifically

may

designed to use

turned ON

be

Phantom Power

of the

ATTEMPT

NOT

DO

ON.

THE MIXER

TO

microphones

the use of a

if necessary, its

or,

of your

wish

you

OB and its

avoid low frequency

inputs

turned

is

connect a

to

microphones,

transformer balanced,

input line. The

negative

is

are held

that

wires

designed to

in a

if

you

inch, insert into

1/4

make it easier to

device called

feel the need,

Mixer

from

name

its

it. This

Phantom

the

by

all inputs

to

phantom

SEVERE

circuitry it is not

USE

TO

DAMAGE MAY OCCUR TOTHE MICROPHONE ( OR

WHICH WILL NOT BE

designed for Phantom

specific microphone

manufacturer.

require

OFF.

lead

Phantom Power

Line level source

make sure that the

that is

capacitor should

connected to the source. A

rolloff.

the two

which

will accommodate a

Phantom

dynamic and ribbon microphones..

provides

fact

the

includes

connect

cage-clamp

a

ll^e

cage-clamp

the

+48

tiiat the DC voltage is

as indicated by

holes

volt DC

most

Power Switch on the Output

except

the auxiliary input located on

possible

to use

unbalanced connections with the Phantom Power

AN UNBALANCED SOURCE

COVERED

Powering will

with the

fine. Otherwise

7510B Mixer,

make sure that the

one of the

to

source

will

have its positive lead

BY

operate

consult

inputs,

not

you

capacitor of

but also

damaged

be

may need to install a

halves of the

not require

does

rear

the

Power for

invisible

connector than

that the wires be tinned,

wire range

panel silkscreen, and tighten

to disconnect

#14-#22

of

condenser microphones.

BALANCED

to

any

microphone

the

The Phantom

Assembly. Turning this switch

the

WHEN

Output

THE PHANTOM POWER

Assembly.

OTHER

Because of

SOURCE

ON

ANY MANUFACTURER'S WARRANTY.

+48

from

volts,

the operating instructions

Phantom Power Switch

need to

by application

connected

10p.F/50V minimum

but

if

you

have any

on the

supply

DC

to

Phantom

+48

of

blocking capacitor in

the input

volt DC.

terminal

rating should

for

the

Output

Power

of the

doubts

to

If

the

be used

Pre-arop_Gain_Adiusl

for

Preamp gain

Input

The

the factory the

from

for

each of the

removed and

only

a

good

for

the connectors are shown

four input channels. These

a resistor

quality

may

pin connector on the rear

15

may

or

1/8

externally adjusted

be

inserted

be

watt carbon

1/4

in Figure

in their

5.

jumpers,

place according

film

or metal

optimum

panel of the Input Assembly includes four wire jumpers, one

which

film

set

resistor

Wiring of Logic Circuits from Remote Control Connector

Figure

shows

5

Assembly.

provides a contact

can switch ±5 volts

gate

contact closure

just a

Figure

drive

television cameras

shows

6

Series

the

In addition to the Preamp Gain adjustments described in the

several examples of circuits

7400

configuration

closure

for an

TTL logic,

in

a

ground

to

with

a

external

LEDs,

teleconferencing system

for

the

when

an input is activated.

maximum

current of 10

source.

which

switch loudspeakers

Remote Control Connector on the rear panel of the Input

milliamperes.

could

be used

OFF

etc.

signal-to-noise

gain

the

to

of the input preamp

the values

for

best noise performance.

contact closure, made through

Note

with

this

provide

to

additional

and

headroom. As shipped

in

Table

that this

contact closure

1 on

section, the 7510B

is not

Acoustic

49 dB, may

at

the next

voltage

a

to

page.

a

source,

activate relays,

switch

Gain,

be

Use

numbers

also

CMOS

Page

7

labkl

Manual

751 OB

Qaitt

unity

4dB

Resistor

open

10

7dB 4.7

9dB

lOdB 2.7

13dB

14dB 1.5

16dB

19dB

3.3 kohm

1.6kohm

1.1

750

22dB 470

24dB 360

25dB 330

kohm

ohm

Gain Resistor

62

ohm ohm ohm ohm

ohm

ohm ohm ohm ohm ohm

28dB 220

29dB 200

31dB 150

34dB 100

37dB

39dB 47

40dB 39

43dB 20

44dB 16

46dB 10

49dB Jumper

1 .

2

.

cn

VO

r-

00

ON

Number

--

Channel

—Channel C

-Channel A

Channel

Channel Logic Switch

J

Channel

Ground

Channel

C

(3)

(1)

D

(4)

B

(2)

D

(4)

A

(1)

Audio

Logic Logic

Logic Switch

Audio

Audio Gain

Figure 5 Remote Control Connector

Gain

Switch

w

n

Gain

11

10

t

Page

8

JBL 7510B User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual