TROUBLE-S

 

 

 

 

 

 

 

 

H

 

 

 

 

 

 

 

 

O

 

 

 

 

 

 

 

 

O

 

 

 

 

 

 

 

 

T

 

 

 

 

 

 

 

 

I

 

 

 

 

 

 

 

 

N

 

 

 

 

 

 

 

 

G

 

 

 

 

 

 

 

 

 

Symptom

Diagnosis

Remedy

 

 

 

 

 

 

 

 

 

 

 

 

 

Engine Noise

Noise is radiating into

Check connections,

and

 

 

 

 

RCA signal cable.

run the RCA cables on a

 

 

 

 

 

different route away from

 

 

 

 

 

sources of high current.

 

 

 

 

 

 

 

 

 

 

 

 

Bad component in the sig-

Checkconnections,andby-

 

 

 

 

nal chain.

passadditionalcomponents

 

 

 

 

 

(crossovers and equalizers)

 

 

 

 

 

betweenthesourceunitand

 

 

 

 

 

the amplifier. Connect one

 

 

 

 

 

component at a time to de-

 

 

 

 

 

termine the culprit. Repair

 

 

 

 

 

or replace components as

 

 

 

 

 

necessary.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Noise is radiating into

Disconnect existing speak-

 

 

 

 

speaker cables.

ers and connect a test

 

 

 

 

 

speaker to the output ter-

 

 

 

 

 

minals of the amplifier. If

 

 

 

 

 

noise is gone, reroute the

 

 

 

 

 

speaker cables away from

 

 

 

 

 

sources of high voltage.

 

 

 

 

 

 

 

 

 

 

 

 

Multiple grounds in the

Check ground connections

 

 

 

 

audio system.

and connect amplifiers, sig-

 

 

 

 

 

nal processors, and other

 

 

 

 

 

components to a central

 

 

 

 

 

location or try a different

 

 

 

 

 

grounding point on

the

 

 

 

 

 

chassis.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ground loop between

Check connections

and

 

 

 

 

source unit and antenna.

disconnect antenna from

 

 

 

 

 

source unit. If noise is gone,

 

 

 

 

 

install an antenna ground

 

 

 

 

 

loop isolator.

 

 

 

 

 

 

 

 

Engine noise with

No reference ground

Connect GND terminal of

 

high level inputs

 

high level input to chassis

 

 

 

 

 

of source unit.

 

 

 

 

 

 

 

 

 

 

 

 

 

• If noise persists, see your Authorized Rockford Fosgate Dealer.

– 34 –

Page 37
Image 37
Rockford Fosgate 5.3x manual Engine noise with