Sunfire TGA-7200 Bedienungsanleitung PDF herunterladen (Seite 16)

User's Manual

APPENDIX

The Sunﬁ re Ampliﬁ er is expertly

designed and built to provide years of

trouble-free per for mance. Most prob-

lems that occur can usually be solved

by checking your setup or making

sure that the audio and video com-

ponents connected to your pro ces sor

are on and fully op er a tion al.

The following information will help

you deal with com mon setup problems

you may experience during normal

use of your unit. If the problems still

persist, please contact your Sunﬁ re

Dealer for assistance.

No sound from one or

more speakers

• Speaker cables may have come

undone. Turn off your system and

check the cables, and tighten the

ampliﬁ er and speaker binding

posts.

• Broken audio cable.

• The preampliﬁ er volume level is

low for the chan nels concerned.

Recheck the pream pli ﬁ er calibra-

tion procedure.

• A preampliﬁ er Mute switch may be

on, or an external processor loop

or a tape monitor loop is engaged.

• Check that your preampliﬁ er or

source is running the correct sur-

round sound mode. Maybe it is set

for stereo when you were expect-

ing 5.1 surround sound.

• Check in case any missing chan-

nels have been turned off in a

preampliﬁ er setup menu. For

example, the center ampliﬁ er

channel will not receive a signal

if the preampliﬁ er has been set to

"Phantom."

• The Auto/on/off switch might be in

the off position.

• One of the fuses for the current

source outputs may have blown.

The ampliﬁ er shuts down

often or the line fuse blows

often

• Check that the positive and nega-

tive speaker wires are not shorted

together.

• Make sure that no speakers are

shorted internally. If you have an

ohm-meter, disconnect the speaker

wires and mea sure the re sis tance

be tween the speaker’s positive

and negative terminals. If the read-

ing is less than 2 ohms, the speak-

ers may have an internal short.

Measure all speak ers and check

their impedance spec i ﬁ ca tions.

• If you have connected speakers

in Par al lel, the overall impedance

may be too low. It is recommended

that you rearrange the speakers

in Series to increase the overall

im ped ance, thus taking some of

the load off the ampliﬁ er.

• Make sure that the ampliﬁ er

has good ventilation and is not

overheating. If the ampliﬁ er is in

a closed rack, open up the rear

panel or use a quiet fan for im-

proved ventilation.

A hum is heard in your

speak ers

This problem is more than likely

caused by a “ground loop” in your sys-

tem, rather than a fault in the ampliﬁ er.

Follow these steps to isolate the main

cause of the hum; there may even be

more than one.

• If your preampliﬁ er has XLR bal-

anced outputs, use them because

they offer greater immunity to

noise ﬁ elds.

• Remember to unplug all compo-

nents in your system, including

the ampliﬁ er, before disconnecting

or con nect ing any cables during

troubleshooting.

Troubleshooting Guide

• Try to have all of your equip ment

on the same electrical outlet or

circuit. Group all the low power

components (preamp, CD player,

DVD etc.) on a single outlet or

power strip. This is provided that

the overall current draw from your

equipment does not exceed the

rating of the outlet or breaker.

• Disconnect all cables which come

from outside the room, and check

if the hum goes away. This in-

cludes such connections as cable

TV, satellite TV, or roof top an-

tennas. Make sure that they are

dis con nect ed where they ﬁ rst enter

the room, so they are making no

con nec tion to the preampliﬁ er or

the TV, or any other component. If

the hum is caused by the cable TV

line, then you will need a “ground

loop iso la tor.” This is an inexpen-

sive device ﬁ tted in line with the

coaxial cable feed. Con tact your

ca ble com pa ny or your Sun ﬁ re

Dealer for as sis tance.

• Disconnect all connections from

the preampliﬁ er to your TV, VCR or

DVD.

• As a test, disconnect any other

com po nent which has a ground ed

pow er cord.

NOTE: Never remove the

ground pin from any power

cords. This is very dan-

ger ous.

• If the hum persists, disconnect all

the source com po nents one at a

time from the back of the preampli-

ﬁ er, until you identify the prob lem.

• Ground loop isolators are available

for audio lines and video. You can

ask your Sunﬁ re Dealer for assis-

tance.

• Try moving the speaker cables

away from any power cords. Try

just one speaker, connecting it to

each ampliﬁ er channel and see if

one channel is bad.

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