Crown PSA-2 Manuel utilisateur

crown

SERVICE

MANUAL

PSA-2/SA2

PSA-2D

/PSA-2DX/PSA-2X

SELF-ANALYZING

AMPLIFIER)

xcsoo2

“1

The

information

furnished

this

manual

does

not

include

all

the

details

design,

production,

variations

the

equipment.

does

not

cover

all

the

possible

contingencies

which

may

arise

during

operation,

installation,

maintenance.

Should

special

problems

arise,

further

information

desired,

please

contact

the

Crown

International

Customer

Services

Department.

Crown

International

1718

Mishawaka

Rd.

Elkhart,

Indiana

46514

Ph:

(219)

294-5571

WARNING

PREVENT

SHOCK

FIRE

HAZARD

NOT

EXPOSE

RAIN

MOISTURE!

CROWN

INTERNATIONAL,

INC.

1718

MISHAWAKA

RD.

ELKHART,

INDIANA

46514

RVW

Sec.

™

Section

™

Review

Introduction

Il.

Warranty

...

Ill.

PSA-2

Specifications

Illustrated

Parts

List

crown

TABLE

CONTENTS

PSA-2

Stereo

Specifications

PSA-2

Monaural

Specifications

PSA-2

Balanced

Input

Module

Specifications

SA2

Specifications

.....

SA2

Stereo

Specification:

SA2

Monaural

Specifications

Panel

Configuration

(PSA-2)

Panel

Configuration

(SA2)

PSA-2

Available

Formats

Performance

Graphs

...

GETeray

formations

s..

sre

csisate

Pleas

elas

ate

OCIS

Fink

sales

Soletgiel

discaretertw

ols

6.2

Standard

and

Special

Parts

6.3

Ordering

Parts

6.4

Shipment

......

RMN

IUSs

gere's'n

cigie

stile

sats

Latte

cue

edie

sels

6.6

Schematics/Bd.

Layouts/

Parts

Lists/

Exploded

View

Drawings

...

Maintenance

7.1

Introduction

7.2.

Required

Test

Equipment

7.3.

Soldering

Techniques

7.4

Basic

Troubleshooting

7.5

Discharging

Instructions

7.6

Disassembly

for

Inspection,

Service,

Testing,

Adjustment

and

Repairs

7.7

Reassembly

7.8

Repair

Instructions.

7.9

Electrical

Checkout,

Troubleshooting

and

Adjustment

7.10

PSA-2

HI/LO

Pass

Filter

Frequency

Alterations.

7.11

Voltage

Conversion

Instructions

7.12

Block

Diagram

Circuit

Theory

7.13

Theory

Operation

Service

Bulletins

crown

LIST

ILLUSTRATIONS

PSA-2:Front

Panel

.5--ciaes.csess

sao

HME

aes

CONT

iss

Sara

oles

SHES

PSA-2

Back

Panel

SA2

Front Panel

SA2

Back

Panel

PSA-2

Available

Formats.

Typical

Distortion.

Typical

Output

Impedance

Typical

Frequency

Response

Output

Phase

Response

Typical

Damping

Factor

ohms)

Typical

Crosstalk

........

Typical

Noise

Spectrum.

Typical

CMR

Through

Balanced

Input

Module

Typical

Power

Output

Low

Frequency

Protect

Action

Typical

Frequency

Response

Balanced

Input

Module

Typical

AGC

Action

Relay/

Power

Supply

Module

Schematic

. .

Relay

Module

Component

Board

Layout

Low

Voltage

Power

Supply

Component

Board

Layout

Anti-pop

Module

Schematic

........

Anti-pop

Module

Foil

Board

Layout

Anti-pop

Module

Component

Board

Layout

Main

Module

#1/Output

Terminal/

PNP-NPN

Main

Module

#2/Output

Terminal/

PNP-NPN

Schematics

Main

Module

Component

Board

Layout

Main

Module

Component

Board

Layout

PNP

Output

Module

Component

Board

Layout

NPN

Output

Module

Component

Board

Layout...

Output

Terminal

Module

Component

Board

Layout

Mother

Board

Module

Component

Board

Layout

PSA-2

Input

Connector

Module

Schematic

PSA-2

Input

Connector

Module

Component

Board

Layout

SA2

Input

Connector

Module

Schematic

SA2

Input

Connector

Module

Component

Board

Layout

PSA-2

Display

Module

Schematic

........

PSA-2

Display

Module

Foil

Board

Layout.

PSA-2

Display

Module

Component

Board

Layout

SA2

Display

Module

Schematic

........

SA2

Display

Module

Foil

Board

Layout.

SA2

Display

Module

Component

Board

Layout

PSA-2

B.I.M./

Filter

Board

Schematic

Balanced

Input

Module

Foil

Board

Layout

Balanced

Input

Module

Component

Board

Layout.

Filter

Board

Component

Layout

Front Panel

Assembly.

SA2

Front

Panel

Fig.

Main

Chassis

Assembly

Transformer

Assembly

...

Power

Capacitor

Assembly

NPN/PNP

Output

Assembly

Back

Panel

Assembly

Final

Assembly

PSA-2

Balanced

Input

Module

Assembly

Miniature

Soldering

Iron

.........

Correct

and

Incorrect

Solder

Applica

Unsoldered

Wire

...

External

Strands

...

Cut

Strands....

Wire

Strippers

Disturbed

Joints

Cold

Solder

Joint.

Rosin

Joint

....

Component

Lead

Spacing

Component

Lead

Bending

Correct

Pressure

Applied

Acceptable

Solder

Joints

Soldering

Lug

Turret

Terminal

Wire

Braid

Desoldering

Discharge

Points

......

Component

Location

Diagram

Internal

Hard

Wiring

Diagram

Consumable

Materials

Chart

...

Correct

Output

Waveform

............-

Correct

Square

Wave

Output

Waveform.

Mono

Output

Waveform

Distortion

Test

Set-up

...

Signal

Noise

Test

Set-up

Test-tone

Output

Waveform

Filter

Board

Schematic

......

Filter

Board

Component

Layout.

Voltage

Conversion

.......

World-wide

Voltage

Map

PSA-2/SA2

Block

Diagram

Common

Output

Configuration

...

PSA-2/SA2

Output

Configuration

crown

REVIEW

SECTION

Introduction

This

manual

contains

complete

service

information

the

Crown

PSA-2/SA2/PSA-2D/PSA-2DX/

PSA-2X

amplifiers.

designed

used

conjunction

with

the

PSA-2/SA2

Instruction

Manual.

However,

some

important

information

duplicated

this

Service

Manual

case

the

Instruction

Manuals

are

not

readily

available.

NOT

THE

INFORMATION

THIS

MANUAL

INTENDED

FOR

USE

EXPERIENCED

TECHNICIAN

ONLY!

II.

Crown

Warranty

Service

Station,

you

should

familiar

with

Crown

warranty

policies.

Each

Instruction

Manual

contains

basic

policies

the

customer.

However,

under

questionable

circumstances,

please

contact

the

Technical

Service

Department

Director

Customer

Service

at:

Crown

International,

Inc.,

1718

Mishawaka

Road,

Elkhart,

46514.

Warranty

Hl.

General

Protection:

Protection

circuitry

limits

the

output

level

protect

the

output

transistor

stage,

even

the

case

elevated

temperature.

Transformer

overheating

results

shutdown

(STANDBY)

that

particular

channel.

Controlled

slewing

rate

voltage

amplifiers

protect

the

unit

against

burnouts.

Input

overload

protection

furnished

resistor

the

input

the

amplifier

limit

current.

PSA-2

Specifications

Output

Offset:

(Shorted

input)

+10

millivolts.

Phase

Response:

+0,

-15

degrees

DC-20KHz

watt.

Input

Impedance:

(XLR

balanced)

20K

ohms.

(phone

jack

unbalanced)

25K

ohms

+30%.

High

Voltage

Power

Supply:

Two

800VA

transformers

with

computer

grade

capacitors

powered

through

10A

relays.

Low

Voltage

Power

Supply:

+15V

supplies

are

provided

current

limited

shortproof

regulator.

Power

Requirements:

50-60Hz

with

adjustable

taps

for

100,

120,

200,

220,

and

240

+10%

operation.

Draws

watts

less

idle

800W

250W

channel

output

into

ohms.

Turn

On:

May

switch

selected

for

instantaneous

four

second

delay

after

applying

power.

dangerous

transients.

Low

Frequency

Load

Protect.:

May

switch

selected

produce

shutdown

(STANDBY)

high

voltage

power

supply

for

outputs

greater

than

26V

low

frequency

outputs

greater

than

26V

5Hz

(see

Graph

RVW.15).

Controls:

Two

position

ON/OFF

rotary

switch.

Ch.

and

Ch,

input

level

controls.

The

LOW

FREQ

PROTECT,

DELAY

and

STEREO/

MONO

slide

switches

are

located

the

rear

panel.

Displays:

yellow

LED

indicates

STANDBY

mode

activated

for

that

respective

channel.

pair

green

LED's

indicate

SIGNAL

presence

the

output

that

respective

channel.

pair

red

LED's

(IOC)

indicate

amplifier

OVERLOAD

conditions

for

that

respective

channel.

amber

LED

POWER

indicator

driven

low

power

control

supply.

Connectors:

Unbalanced

Input

4”

phone

jacks.

Output-color

coded

dual

binding

posts

standard

%4”

centers;

spaced

%”

apart

for

mono

(balanced)

output

connection.

Line

Three

wire

20A,

120V

male

connector

with

ft.

cable.

Ground

Selectivity

lug

terminal

block

with

removable

shorting

strap.

Module

Plug-ins:

Standard

rear-panel

balanced

input

module

(module

replacement

information

available

upon

request).

Dimensions:

19”

standard

rack

mount

(EIA

Standard

RS-310-B)

7”

height,

1434”

behind

mounting

surface.

Handles

extend

2'4”

front

mounting

surface.

Center

gravity

5.4”

behind

the

front

panel.

Weight:

pounds

(25.8Kg)

net

weight.

Finish:

Satinized

aluminum

front

panel

with

gray

suede

Lexan

insert

and

black

adonized

aluminum

chassis

and

covers.

Construction:

Aluminum

chassis,

specially

designed

“flow-through”

ventalation

top

front

and

side

panels.

Heavy

duty

handles

ease

transport.

Plug

rear

panel

balanced

input

module.

Heat

Sinking:

Forced

air

with

high

efficiency

coolers.

two

speed

fan

with

intake

filter

(washable)

mounted

the

back

(rear)

the

amplifier

forces

air

through

coolers

and

out

both

the

top

and

sides

the

amplifier.

IV.

PSA-2

Stereo

Specifications

(Exclusive

Balanced

Input

Module)

Output

Power:

220

watts

per

channel

minimum

RMS

(both

channels

operating)

into

ohm

load,

20Hz-

20KHz

rated

RMS

sum

total

harmonic

distortion

0.05%

the

fundamental

output

voltage

(tested

per

FTC

specifications),

250

watts

+IdB

per

channel,

20Hz-

20K

into

ohms

with

than

1.0%

THD

(EIA

Std.

SE-101-A).

Output

Power

ohms):

400

watts

+1dB

per

channel,

20Hz-20K

into

ohms

with

than

1.0%

THD

(EIA

Std.

101-A).

Output

Power

ohms):

685

watts

+1dB

per

channel

into

ohms

with

than

1.0%

THD.

Hum

and

Noise:

15dB

below

rated

output

“A”

weighted

110dB

below

rated

output

(20Hz-20K

Hz).

Response:

0.1dB

20Hz-20K

watt

into

ohms

1,5dB

DC-80K

Hz.

Harmonic

Distortion:

Less

than

0.002%

from

20Hz-

1KHz

and

increasing

linearly

0.05%

20K

220

watts

into

ohms,

per

channel.

Distortion:

Less

than

0.01%

from

0.25

watts

220

watts

into

ohms

per

channel.

Slewing

Rate:

Greater

than

volts

per

microsecond.

Damping

Factor:

Greater

than

700,

400Hz

into

ohms.

Output

Impedance:

Less

than

milliohms

series

with

less

than

1,2

microhenries.

Load

Impedance:

Rated

for

16,

and

ohm

usage,

safe

with

all

loads.

Voltage

Gain:

20+2%

26dB

+.2dB

maximum

gain.

Input

Sensitivity:

2.1

volts

for

220

watts

into

ohms.

Output

Signal:

Unbalanced,

dual

channel.

PSA-2

Monaural

Specifications

(Exclusive

Balanced

Input

Module)

Output

Power

ohms):

800

watts

1dB;

20Hz-20K

into

ohms

with

than

1.0%

THD

(EIA

std.

SEIOI-A).

Output

Power

(16

ohms):

500

watts

1dB;

20Hz-20K

into

ohms

with

than

1.0%

THD

(EIA

Std.

SE-101-A).

Output

Power

ohms):

1370

watts

+1dBat

Hzinto4

ohms

with

than

1.0%

THD.

Frequency

Response:

+0.2dB,

DC-20K

watt

into

ohms.

Harmonic

Distortion:

Less

than

0.003%

from

20Hz

IKHz

and

increasing

linearly

0.08%

20KHz,

500

watts

into

ohms.

Less

than

0.005%

from

20Hz

1KHz

and

increasingly

linearly

0.12%

20K

Hz,

800

watts

into

ohms.

Distortion:

Less

than

0.015%

from

0.25

watts

500

watts

into

ohms.

Less

than

0.015%

from

0.25

watts

700

watts

into

ohms.

Slewing

Rate:

Gre

than

volts

per

microsecond,

Damping

Factor:

Greater

than

700,

DC-400Hz

into

ohms.

Output

Impedance:

Less

than

milliohms

series

with

less

than

2.4

microhenries.

Load

Impedance:

Rated

for

and

ohm

usage,

safe

with

all

loads.

Voltage

Gain:

32dB+.2dB

maximum

gain,

Input

Sensitivity:

2.2

volts

for

500

watts

into

ohms.

Output

Signal:

Balanced,

single

channel.

Channel

controls

are

active;

Channel

inactive

but

not

removed

from

operation.

VI.

PSA-2

Balanced

Input

Module

Specifications

Controls:

Channel

and

Channel

input

gain

adjust

with

the

AGC

Threshold,

accessible

from

the

rear

the

Balanced

Input

Module.

Hum

and

Noise:

-85dBm

equivalent

input

noise

20Hz-

20K

Hz,

600

ohm

source,

gain

set

unity.

crown

Frequency

Response:

Flat

+0.2dB

20Hz

20KHz.

High

and

Low

Pass

Filters:

pole

Butterworth

18dB/octave;

SOHz

and

1S5KHz

standard

frequencies.

(Other

roll-off

points

available;

see

Sec.

7.10

for

details.)

Slide

switch

activated.

Compressor

Action:

Range

compression

restricted

13d

design

(wider

range

would

aggravate

feedback

live

performance).

Threshold

adjustable

from

overload

level

main

amplifier

12dB

lower.

Balanced

Input

Voltage

Gain:

Variable

0-10

+30%.

Test

Tone:

Switch

activated

wide

spectrum

50Hz-20K

tone.

Common

Mode

Rejection:

70dB

5SHZ-3KHz

55dB

20K

(see

Graph

RVW.13).

VII.

SA2

Specifications

General

Protection:

Protection

circuitry

limits

the

output

level

protect

the

output

transistor

stage,

even

the

case

elevated

temperature.

Transformer

overheating

results

shutdown

(STANDBY)

that

particular

channel.

Controlled

slewing

rate

voltage

amplifiers

protect

the

unit

against

burnouts.

Input

overload

protection

furnished

resistor

the

input

the

amplifier

limit

current.

Output

Offset:

(Shorted

input)

+10

millivolts.

Hum

and

Noise:

15dB

below

rated

output

“A”

weighted

110dB

below

rated

output

(20Hz-20K

Hz).

Phase

Response:

+0,

-15

degrees

DC-20KHz

watt.

Input

Impedance:

25K

ohms

+30%.

High

Voltage

Power

Supply:

Two

800VA

tranformers

with

computer

grade

capacitors

powered

through

10A

relays.

Low

Voltage

Power

Supply:

+15V

supplies

are

provided

current

limited

shortproof

regulator.

Power

Requirements:

50-60Hz

with

adjustable

taps

for

100, 120,

200,

220,

and

240+

10%

operation.

Draws

watts

less

idle;

800W

220W

channel

into

ohms.

Turn

On:

May

switch

selected

for

instantaneous

four

second

delay

after

applying

power.

dangerous

transients.

Low

Fregency

Load

Protect:

May

switch

selected

produce

shutdown

(STANDBY)

high

voltage

power

supply

for

outputs

greater

than

26V

low

frequency

outputs

greater

than

26V

peak

S5Hz

into

ohms.

Controls:

Two

position

ON/OFF

rotary

switch.

Right

and

Left

Input

Level

controls.

The

LOW

FREQ

PROTECT,

DELAY

and

STEREO/MONO

slide

switches

are

located

the

rear

panel.

Displays:

amber

LED

indicates

power

on.

pair

yellow

LED's

indicate

STANDBY

mode

activated

for

that

respective

channel.

Two

sets

fifteen

green

LED's

form

display

ladder

that

indicate

peak-hold

and

running

peak

simultaneously,

the

amplifier’s

output

level

over

42dB

range.

pair

red

LED's,

1OC

(Input

Output

Comparator),

indicate

amplifier

overload

for

that

respective

channel.

Connectors:

Unbalanced

Input

jacks.

OutputColor

coded

dual

binding

posts

standard

4%”

centers;

spaced

¥,”

apart

for

MONO

(Balanced)

output

connection.

Line

Three

wire

20A,

120V

male

connector

with

ft.

cable.

Ground

Selectivity

lug

terminal

block

with

removable

shorting

strap.

Dimensions:

19”

standard

rack

mount

(EIA

Standard

RS-310B)

7”

height,

144”

behind

mounting

surface.

Center

gravity

5.4”

behind

front

panel.

Extends

2/4”

front

mounting

surface

with

optional

handles.

Construction:

Aluminum

chassis,

specially

designed

“flow-through”

ventilation

top

and

side

panels.

Heat

Sinking:

Forced

air

with

high

efficiency

coolers.

two

speed

fan

with

intake

filter

(washable)

mounted

the

rear

the

amplifier

forces

air

thru

coolers

and

out

both

the

top

and

sides

the

amplifier.

Weight:

pounds

(25.8Kg)

new

weight.

Finish:

Satinized

aluminum

front

panel

with

gray

suede

Lexan

insert

and

black

anodized

aluminum

chassis

and

covers.

Vill.

Output

Power:

220

watts

per

channel

minimum

RMS

(both

channels

operating)

into

ohm

load,

20Hz-

20K

ata

rated

RMS

sum

total

harmonic

distortion

0.5%

the

fundamental

output

voltage.

350

watts

per

channel

minimum

RMS

(both

channels

SA2

Stereo

Specifications

R-3

operating)

into

ohm

load,

20Hz-20KHz

rated

RMS

sum

total

harmonic

distortion

0.08%

the

fundamental

output

voltage.

600

watts

per

channel

minimum

RMS

(both

channels

operating)

into

ohm

load,

Hz;

rated

RMS

sum

total

harmonic

distortion

1.0%

the

fundamental

output

voltage.

Frequency

Response:

+0.

|dB

20Hz-20K

Hzat

watt

into

ohms

-1.5dB

DC-80K

Hz.

Harmonic

Distortion:

Less

than

0.002%

from

20Hz-

1KHz

and

increasing

linearly

0.05%

20K

Hz,

220

watts

into

ohms,

per

channel.

Distortion:

Less

than

0.01%

from

0.25

watts

220

watts

into

ohms

per

channel.

Slewing

Rate:

Greater

than

volts

per

microsecond.

Damping

Factor:

Greater

than

700,

DC-400Hz

into

ohms.

Output

Impedance:

Less

than

milliohms

series

with

less

than

1.2

microhenries.

Load

Impedance:

Rated

for

16,

and

ohm

usage,

safe

with

all

loads.

Voltage

Gain:

+2%

26dB

+.2dB

maximum

gain.

Input

Sensitivity:

2.1

volts

for

220

watts

into

ohms.

Output

Signal:

Unbalanced,

dual

channel.

IX.

SA2

Monaural

Specifications

Output

Power:

700

watts

minimum

RMS

into

ohm

load,

20Hz-20K

rated

RMS

sum

total

harmonic

distortion

0.12%

the

fundamental

output

voltage.

440

watts

minimum

RMS

into

ohm

load,

20Hz-

20K

rated

RMS

sum

total

harmonic

distortion

0.08%

the

fundamental

output

voltage.

1200

watts

into

ohm

load,

ata

rated

sum

total

harmonic

distortion

1.0%

the

fundamental

output

voltage.

Frequency

Response:

+0.2dB,

DC-20K

watt

into

ohms.

Harmonic

Distortion:

Less

than

0.003%

from

20H7z

and

increasing

linearly

0.08%

20K

Hz,

440

watts

into

ohms.

Less

than

0.005%

from

20Hz

IKHz

and

increasingly

linearly

0.12%

20K

Hz,

700

watts

into

ohms.

Distortion:

Less

than

0.015%

from

0.25

watts

440

watts

into

ohms.

Less

than

0.015%

from

0.25

watts

700

watts

into

ohms.

Slewing

Rate:

Greater

than

volts

per

microsecond.

Damping

Factor:

Greater

than

700,

DC-400Hz

into

ohms.

Output

Impedance:

Less

than

milliohms

series

with

less

than

2.4

microhenries.

Load

Impedance:

Rated

for

and

ohm

usage.

Voltage

Gain:

40+

32dB

+.2dB

maximum

gain.

Input

Sensitivity:

2.1

volts

for

440

watts

into

ohms.

Output

Signal:

Balanced,

single

channel.

Channel

controls

are

active;

Channel

inactive

but

not

removed

from

operation.

crown

Panel

Configuration

10C

INDICATORS

SIGNAL

PRESENCE

INDICATORS

INPUT LEVEL

CONTROLS

STANDBY

INDICATORS

ON/OFF

INDICATOR

POWER

CONTROL

ceclae

™moom>

Fig.

RVW.1

PSA-2

Front

Panel

Psn-2

SeiF

ANAWZING

‘ampuricr

BALANCED

INPUT

MODULE

OUTPUT

BANANA

JACKS

LOW

PASS

FILTER

SWITCHES

GAIN

ADJUST

CONTROLS

HIGH PASS

FILTER

SWITCHES

TEST

TONE

GENERATOR

SWITCH

BALANCED

XLR

INPUT

JACKS

FAN

FILTER

COVER

GROUND

TERMINAL

STRIP

DELAY

SWITCH

LOW

FREQ.

PROTECT

SWITCH

STEREO/MONO

SWITCH

UNBALANCED

INPUT

JACKS

AGC

THRESHOLD

CONTROL

7zoRxozZ0|

Erxe-z09

Fig.

RVW.2

PSA-2

Back

Panel

Autres manuels pour PSA-2

Ce manuel convient aux modèles suivants

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