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SERVICE

MANUAL

ZILPIN

4/3/2

Channel

Power

Amplifier

3554

Contents

SPECiICALIONS:

sida

5

cue

SR

SPARE

RS

Lea

peter

rae

ete

ice

pate

A

ae

ens

2

FeatureS

0...

cece

ccc

een

eee

eee

eee

e

ener

n

teen

nee

3

Switches

and

Terminals

........

00...

c

eee

eee

enter

tenet

et

een

es

4

Switch

Settings

«00.2.0...

ccc

c

cece

e

eee

teeter

eee

een

e

eee

ene

n

eens

ent

n

enter

eter

nentans

5

Characteristic

CurveS

.......00

0.0

ee

ee

nee

e

nee

e

nee

een

e

eters

6

CORMOOHOIE

-

daeoc

occ

denigh

ised

COR

GRE

ak

EGA

RAO

SR

He

Rae

HE

Madani

OSG GUS

Lote

Eee

s

7

Precautions

...........---+-0--

BPD

og

Me

accent

at

hing

ye

he

deeth

eras

ete

seals

vie

ananc

tits

dete

“g-S

uated

cele

calne

Senne

ae

8

F

Disassembly

Instructions

......

00...

eee

teen

tenet

ee

tenes

9

Block

Diagram

.....2

0.

eee

e

ccc

eect

e

eee

ene

n

ene

n

enn

nese

nen aee

rene

ess

sneenens

10

to

11

Parts

Layout

on

P.C.Boards

and

Wiring

Diagram

......-.

60...

see

eee

eee

eee

tee

e

nes

12

to

14

Schematic

Diagram

.......

2...

center

n

eee

enter

eres

es

15

to

17

iC’s

and

Transistors

Voltage

Values

.......

2.0...

eee

eee

eee

ete

tenet

ees

18

Exploded

View

(Cabinet)

..

0.0.6...

0c

cee

cece

eee

teen

tne

tne

nent

nena

19

to

20

Cabinet

Assembly

Parts

List...

0.0...

cee

et

tenet

nent

t

teens

21

Electrical

Parts

List

2.0.0...

een

eee

nee

eee

net

ent

nna

22

to

25

Packing

Method

View

.........

0.00

c

ccc

e

eee

cette

eee

e

eee

e

teen

ttt

n

eterno

tere

enecnnecnaaes

26

Packing

Assembly

Parts

List

......

2.6.0.

eee

eee

eee

nent

nee

nent

eee

ee

nnn

26

Semi-Conductor

Lead

Identifications

2.0.02...

0.

eet

ete

teens

27

to

29

nn

Specifications

Power

SOUICE

20...

cnn

ee

eee

en

nee

ent

eens

14.4VDC

(11

~

16V)

Current

Drain

(No

Signal)

......

0.0...

e

cece

ene

enter

teen

eee

eet

ee

3.5A

Power

Output

(1

KHz,

0.8%

THD)

....

2.6...

cece

ee

eee

ee

ees

145W/4ch

Input

Sensitivity

0.0...

ete

net

eens

Fixed:

0.5V+

2

dB

Variable:

2V+

2

dB

Frequency

Response

(-10B)

........-.

00.

see

eee

eee

tenet

eee

teens

20

Hz

~

40

kHz

Signal

to

Noise

Ratio..............-.-55--

sgt

BB

eS

ang

a's

cadon

tiie

gia

eager

Th

asatn)

ans

atedncererics

100

dB

Separation

0...

cceee

cutee

ee

a

ee

re

deel

tine

ewe

een

ee

eee

ea

Re

eee

na

de

ede

eens

.

56dB

Input

Impedance

....

1.6.66.

ee

ete

teen

tenes

10

kohm

+

2

kohm

Output

Impedance

..

6.6

ee

ett

eee

eee

n

eee

.

4o0hm

Output

Noise

...

26.0.6...

cece

eee

eee

erent

een

e

tence

reat

ee

ene

e

ena

ene

enee

atin

st

1mvV

Semiconductors

...........

0.00.

eee

eee

eee

13

IC’s,

51

Transistors,

29

Diodes,

6

Zener

Diodes,

2

LED's

Dimensions

......

0.0.00

cc

eee

ete

e

enn

285(W)x

55(H)

x

300(D)

mm

:

WEIGHT

token

piste

Cais

cae

kdod

Sawa

a

SU

Rg

eee

lee

ht

eet

ed

Fee

Veena

eas

4.15

kg

_

NOTE:

Due

to

continuing

product

improvement,

specifications

and

design

are

subject

to

change

without

notice.

e

Features

e

4/3/2-Channel

Operation:

The

3554

can

be

used

in

3

ways

as:

a.

4-channel

full-range

amplifier,

producing

50W

per

channel

into

4

ohms,

or

75W

per

channel

into

2

ohms.

The

amplifier

can

be

used

in

a

4-speaker

full

range

system

or

in

a

bi-amped,

dual

subwoofer

and

dual

satellite

combination.

b,

3-channel

amplifier,

producing

50W

(4

ohms)

or

75W

(2

ohms)

into

channels

1

&

2,

and

150W

(4

ohms)

into

the

third

channel.

This

combination

is

perfect

for

a

single

subwoofer,

dual

satellite

(right

and

left)

system.

c.

2-channel

full-range

amplifier,

producing

150W

per

channel

into

4

ohms.

The

amplifier

can

be

used

as

full

range,

low-pass

(sub-woofer

amp),

or

high-pass

(satellite

amp).

e

Status

Monitor:

This

indicator

illuminates

in

green

when

the

3554

is

on

and

operational.

This

light

will

turn

orange

if

any

protection

circuitry

is

activated.

It

can

be

used

as

a

troubleshooting

aide

should

an

installation

problem

develop.

e

Active

Dividing

Network:

Abuilt-in,

switchable

electronic

crossover

network

at

80

Hz,

18

dB

per

octave

can

be

used

to

set

up

the

amplifier

for

low-pass

(subwoofer)

or

high-pass

(tweeter/midrange

satellite)

applications.

This

network

can

also

be

switched

off

to

allow

full-range

signal

amplification.

e

Duo-B

Feedback

Circuitry:

Duo-Beta

is

a

patented

and

technologically

advanced

form

of

negative

feedback.

Negative

feedback

is

used

to

minimize

distortion

and

stabilize

the

amplifier.

Too

much

feedback,

however,

increases

the

transient

intermodulation

distortion

(T.I.M.),

decreases

the

amplifier

slew

factor,

and

reduces

its

musicality.

The

Duo-Beta

circuitry

supplies

low

negative

feedback

throughout

the

audio

frequency

and

very

high

negative

feed-back

at

DC.

This

stabilizes

the

amplifier,

removes

DC

offset,

and

offers

excellent

total

harmonic

distortion

(T.H.D.)

characteristics.

It

also

provides

low

T.I.M.,

with

excellent

slew

factor,

stability,

and

musicality.

@

No

Current

Limiting:

Current

limiting

circuitries

used

in

conventional

amplifiers

may

cause

premature

clipping

and

inferior

transient

response.

Absence

of

current

limiters

in

the

audio

section

ensures

low

T.I.M.,

excellent

transient

response,

and

superb

sonic

quality.

e

S.T.A.R.

Circuitry:

Alpine

proprietary

Signal

Transit

for

Accurate

Response

circuit

topology

improves

sonic

properties

by

reducing

interaction

between

different

sections

of

the

circuitry.

3554

e

Input

Mode

Selector:

This

switch allows

the

user

to

specify

the

input

signal

entering

the

amplifier:

a.

Stereo

Mode:

Allows

the

right

and

left

channel

signals

to

reach

their

designated

amplifier

channels.

This

mode

provides

a

stereo

output

or

a

center

channel

common

information

output

(when

used

in

the

bridged

configuration).

b.

L

(MONO)

Mode:

Disables

the

right

channel

input

connector

and

routes

the

signal

through

the

left

channel

input

to

all

sections

of

the

amplifier.

This

mode

can

be

used

when

a

single

(mono)

signal

is

amplified

(either

in

stereo

or

bridged

operation).

.

L+R

Mode:

Sums

the

right

and

left

channel

input

signals

and

routes

the

result

to

all

sections

of

the

amplifier.

It

can

be

used

in

stereo

or

bridged

operation

to

provide

a

summed

(mono)

output.

(2)

e@

DC-to-DC

Switching

Mode

Power

Supply:

Provides

excellent

power

output

throughout

the

audio

bandwidth

(20

Hz

to

20

kHz).

Its

soft

clipping

characteristics

ensure

superb

transient

response

and

musicality.

e

Fully

Complementary,

Discrete

Output

Circuitry:

For

excellent

reliability,

superb

sonic

performance

and

high

current

capability

for

accurate

transient

response.

e

Continuously

Adjustable,

Independent

Front

and

Rear

Input

Gain

Controls:

Allow

different

level

settings

for

the

two

different

audio

sections.

e@

Heavy

Duty

Construction:

Glass-epoxy

printed

circuit

boards

for

excellent

thermal

stability

and

long-term

reliability.

e

Gold-Plated

RCA

input

Connectors:

For

most

accurate

signal

transmission

and

lowest

possible

loss.

Gold-plated

terminals

are

immune

to

signal

deterioration

caused

by

corrosion

in

the

connectors

that

can

develop

over

time.

@

Gold-Plated

Speaker

Output

and

Power

Connectors:

For

high

definition,

minimum

loss

power

transfer

and

oxidization

resistance.

@

High

Performance,

Low

Noise,

Audiophile

Quality

Active

and

Passive

Components.

@

Capacitive/inductive

Power

Supply

Input

and

Output

Filtering:

For low

radio

frequency

interference

(RFI)

and

immunity

to

system

noises

(such

as

alternator

whine).

@

Fully

Protected

Against

Wiring

Errors.

3554

Switches

And

Terminals

PDQQOVOOO@

OO

OOOHOO

Input

Mode

Selector

Switch

(Channels

1/2)

Active

Dividing

Network

Mode

Selector

Switch

(Channels

1/2)

Input

Gain

Selector

Switch

(Channels

1/2)

Input

Gain

Adjustment

Control

(Channels

1/2)

Input

Gain

Adjustment

Control

(Channels

3/4)

Input

Gain

Selector

Switch

(Channels

3/4)

Active

Dividing

Network

Mode

Selector

Switch

(Channels

3/4)

Input

Mode

Selector

Switch

(Channels

3/4)

Input

RCA

Jacks

(Channels

1/2)

Speaker

Output

Terminals

(Channels

1/2)

Fuse

Blocks

Power

Terminals

Remote

On

Connector

Speaker

Output

Terminals

(Channels

3/4)

Input

RCA

Jacks

(Channels

3/4)

Status

Monitor

Switch

Settings

Input

Mode

Selector

Switches

@

and

©:

a)

Set

to

the

“ST”

position

(center)

when

the

amplifier

is

used

as

a

4-channel

stereo

system.

ro

L(MONO)

ST

L+R

b)

Set

to

the

"L

(MONO)"

position

when

the

amplifier

is

used

for

one

channel

of

a

stereo

or

bridged

system.

a

L({MONO)

ST

L+R

c)

Set

to

the

"L+R"

position

when

the

amplifier

is

used

for

the

subwoofer

system

which

uses

the

right

channel

and

left

channel

signals

summed.

—

L(MONO)

ST

L+R

Active

Dividing

Network

Selector

Switches

@

and

©

a)

Set

to

the

"LP"

position

when

the

amplifier

is

used

for

the

low-pass

(sub-woofer)

system.

The

frequencies

higher

than

80

Hz

will

be

cut

(at

a

rate

of

18

dB

per

octave).

b)

Set

to

the

"HP"

position

when

the

3554

is

used

for

the

high-pass

(tweeter/midrange

and

subwoofer)

system.

The

frequencies

lower

than

80

Hz

will

be

cut

(at

a

rate

of

18

dB

per

octave).

TS

OFF

HP

LP

3554

c)

Set

to

the

"OFF"

position

when

the

3554

is

used

for

the

regular

stereo

system

with

full-range

speakers.

The

full

bandwidth

will

be

output

without

cutting

the

high

or

low

frequencies.

pe,

OFF

HP

LP

Fixed/Variable

Input

Selector

Switches

@

and

©:

a)

Set

to

the

"FIXED"

position

when

connecting

the

3554

to

other

Alpine

products.

This

position

sets

the

input

sensitivity

to

500

mV

which

corresponds

to

the

pre-amp

output

of

Alpine

products.

r—

L_

VARIABLE

FIXED

b)

Set

to

the

"VARIABLE"

position

when

connecting

the

3554

to

a

non-Alpine

product

with

an

output

voltage

other

than

500

mV.

This

position

should

also

be

used

when

adjustment

of

input

sensitivity

is

required

to

obtain

certain

imaging

requirements

or

to

compensate

for

different

speaker

efficiencies.

ane

|

VARIABLE

FIXED

Input

Gain

Controls

®

and

©:

After

setting

the

Input

Select

Switches

@

and

©

to

the

"VARIABLE"

position,

rotate

the

Input

Gain

Controls

4

and

5

with

a

#0

screwdriver

and

adjust

the

input

gain

to

the

point

where

there

is

maximum

volume

with

no

distortion.

Status

Monitor:

This

indicator

lights

green

when

the

power

is

on.

The

3554

has

built-in

protection

circuitry.

If,

for

some

reason,

this

protection

circuit

is

activated,

the

indicator

turns

orange.

If

this

happens,

turn

the

system

off,

find

the

cause

of

the

problem

and

remedy

the

situation.

This

includes

checking

all

your

connections

and

wiring.

If

the

indicator

remains

orange

when

the

system

is

turned

on,

consult

yourauthor-

ized

Alpine

dealer.

Note:

The

indicator

will

illuminate

in

orange

for

a

iew

seconds

when

the

power

is

turned

on

as

the

protection

circuit

will

be

activated.

This

is

normal.

3554

Characteristic

Curves

POWER

VS.

DISTORTION

CURVE

cA

200

T.H.D.

(%)

“=

HH

0.01

0.01002

0.05

0.1

1

2

5

10

20 50

100

OUTPUT

POWER

(W)

FREQUENCY

RESPONSE

CURVE

a

en

|

OS

|

aE

0

1

eee

a

O01

0

Coon

oo

an

On

Coo

Co

RESPONSE

(dB)

10

«6200

50

100s

«200

500

1K

2

FREQUENCY

(Hz)

Connections

Insulation

Tubes

(INCLUDED)

Before

making

connections,

be

sure

to

turn

the

power

off

to

all

audio

components.

Insulation

tubes

for

the

speaker

leads

and

the

power

supply

leads

are

supplied

with

the

3554,

route

the

speaker

leads

and

the

power

supply

leads

separately

through

these

tubes.

1.

Speaker

Output

Terminal

The

3554

has

two

sets

of

speaker

outputs

for

the

Front

and

Rear

speakers.

Be

sure

to

observe

correct

speaker

output

connections

and

phasing.

In

the

stereo

mode

connect

the

right

speaker

output

to

the

right

speaker,

and

the

left

to

left.

Connect

the

positive

output

to

the

positive

speaker

terminal,and

the

negative

to

negative.

In

the

bridged

mode,

connect

the

left

positive

to

the

positive

terminal

on

the

speaker,

and

the

right

negative

to

the

negative

terminal

of

the

speaker.

Do

not

use

the

speaker

(-)

terminal

commonly

for

the

right

and

left

speakers

or

connect

it

to

the

vehicle’s

chassis

ground.

Note:

Do

not

connect

speaker

leads

together

or

to

chassis

ground.

3554

(INCLUDED)

Remote

On

Lead

(Blue/White)

e{C>

Ground

Lead

(Black)

Pas

Battery

Lead

(Yellow)

2.

Ground

Lead

(Black)

Connect

this

lead

securely

to

a

clean,

bare

metal

spot

on

the

vehicle’s

chassis.

Verify

this

point

to

be

atrue

ground

by

checking

for

continuity

between

that

point

and

the

negative

(-)

terminal

of

the

vehicle’s

batiery.

3.

Battery

Lead

(Yellow)

Connect

this

lead

directly

to

the

positive

(+)

terminal

of

the

vehicle's

battery.

Do

not

connect

this

lead

to

the

vehicle’s

electrical

system.

4.

Remote

Turn-On

Lead

(Blue/White)

Connect

this

lead

to

the

remote

turn

on

lead

of

your

head

unit.

;

5.

Input

RCA

Jacks

Connect

these

jacks

to

the

line

out

leads

on

your

head

unit

using

optional

RCA

extension

patch

cords.

Be

sure

to

observe

correct

channel

connections;

Left

to

Left,

Right

to

Right,

Front

to

Front,

and

Rear

to

Rear.

Three

simple

and

typical

system

combinations

are

illustrated.

For

wiring

connections,

carefully

follow

the

instructions

provided

with

each

component.

3554

Precautions

_

iw)

wo

.

Improper

wiring

connections

could

cause

damage

to

your

vehicle’s

electrical

system

and/or

the

3554

amplifier.

Carefully

follow

the

wiring

instructions

in

this

manual.

.

Attaching

the

battery

lead

to

the

positive

(+)

terminal

of

the

battery

should

be

the

last

connection

after

all

other

connections

are

made.

.

Due

to

the

high

power

output

of

the

3554,

it

is

important

that

all

connections

are

clean

and

well

secured,

or

damage

could

result.

.

Be

sure

that

the

3554

is

mounted

in

a

way

that

will

allow

for

free

air

circulation

and

heat

dissipation.

.

When

changing

fuses,

be

sure

to

replace

the

old

fuse

with

one

of

the

same

amperage.

Use

of

improper

fuses

can

lead

to

serious

damage

to

components.

Disassembly

Instructions

1.

Removal

of

Bottom

Cover.

(1)

Remove

four

screws

marked

"O

"as

shown

in

Figure

1.

(2)

The

Bottom

Cover

will

be

removed

by

pulling

out

in

the

arrow

direction

as

shown

in

Figure

1.

2.

Removal

of

Amp

P.C.Board.

(1)

After

removal

of

the

Bottom

Cover,

remove

31

screws

marked

"

@".

Then,

the

Amp

P.C.Board

will

be

removed

from

heat tank

together

with

Rear

Chassis

and

RCA,

Output

Connector

and

Power

P.C.Board

as

shown

in

Figure

2.

(2)

Remove

two

screws

marked

"MM

_"

and

the

solders

located

two

placed

as

shown

in

Figure

3.

(3)

After

removal

of

two

pieces

of

fuse,

remove

seven

screws

marked"

&

"

and

the

hooks

located

at

six

places

as

shown

in

Figure

4.

(4)

After

the

above

procedures

are

completed,

RCA,

Output

Connector

and

Power

P.C.Board

is

ready

to

be

removed

from

Rear

Chassis

together

with

the

Main

P.C.Board.

Figure

3

BOTTOM

COVER

REMOTE

P.C.Board

RCA

P.C.Board

OUTPUT

CONNECTOR

P.C.Board

Figure

2

FUSE

HOOK

Figure

4

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