Carvin FET1000 Instruction Manual - Page 36

PET

Series

Power

Amplifiers

About

the

FET

Series

Amps

Section

3

The

Protect

LED:

The

protect

light

illuminates

whenever

the

FET

Amp's

internal

SpeakerGuardmi

protection

circuitry

is

engaged.

There

are

three

conditions

that

will

activate

the

SpeakerGuardm

4

protection

circuits:

Reasons

for

the

Protect

LED

to

be

on:

1.

A

Short

at

the

Output

Shorted

speaker

cables

are

the

most

common

cause

of

this

problem.

Even

a

momentary

short

will

trip

the

protect

circuit.

Check

the

speaker

cables

at

both

ends

and

repair

or

replace

any

questionable

cables.

Then

reset

the

amp

by

turning

it

off

for

about

3

seconds

and

then

back

on.

If

the

light

does

not

go

out

when

you

cycle

the

power

off

and

on

then

the

amp

is

in

thermal

shutdown.

2.

Excessive

Current

Draw

from

the

Amplifier

This

could

be

the

result

of

operating

the

amp

at

very

high

levels

into

a

speaker

load

less

than

4O.

Reset

the

amp

by

turning

it

out

and

then

back

on.

If

the

light

does

not

go

out

when

you

cycle

the

power

off

and

on

then

the

amp

is

in

thermal

shutdown.

3.

Thermal

Shutdown

This

could

be

the

result

of

blocked

intake

vents

for

the

fan

cooling

system

or

could

result

from

operating

the

amp

at

very

high

levels

into

a

speaker

load

less

than

4O.

Clear

any

vent

obstructions

and

wait

for

the

amp

to

cool

down

(leave

the

power

on

to

keep

the

fan

running).

After

a

few

minutes

reset

the

amp

by

turning

it

off

and

then

back

on.

If

the

protect

light

remains

on

after

allowing

the

amp

to

cool

and

powering

the

amp

off

and

on,

then

shut

the

amplifier

down,

unplug

the

speakers,

and

turn

the

amp

back

on

to

see

if

the

fault

has

cleared.

If

the

protect

light

remains

on

then

disconnect

the

input

signal

and

check

for

the

protect

light

again.

If

the

protect

light

still

comes

on

even

after

allowing

the

amp

to

cool

down,

and

with

no

speakers

connected

and

no

input

connected,

then

the

amp

needs

servicing.

Rack

Mounting:

The

FET

series

amplifiers

are

packaged

in

a

standard

three

space

5

1/4"

rack

mount

chassis.

When

rack

mounting

the

amplifier

be

sure

to

allow

for

adequate

ventilation

at

the

rear

of

the

amp.

Each

FET

amplifier

features

contoured

handles

for

carrying

and

mounting

the

amplifier.

The

rack

handles

are

used

to

mount

the

front

panel

of

the

amplifier

to

the

sub

-chassis

and

therefore

should

not

be

removed.

3-5

Carvin FET1000 Instruction Manual - Page 36

Carvin FET1000 Manual

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