Sunfire 200 seven - Manual (Page 16)

User's Manual
16
APPENDIX
The SunÞ re AmpliÞ 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 SunÞ 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
ampliÞ er and speaker binding
posts.
• Broken audio cable.
• The preampliÞ er volume level is
low for the chan nels concerned.
Recheck the pream pli Þ er calibra-
tion procedure.
• A preampliÞ er Mute switch may be
on, or an external processor loop
or a tape monitor loop is engaged.
• Check that your preampliÞ 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
preampliÞ er setup menu. For
example, the center ampliÞ er
channel will not receive a signal
if the preampliÞ 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 ampliÞ 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 Þ 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 ampliÞ er.
• Make sure that the ampliÞ er has
good ventilation and is not over-
heating. Use the crystal base to al-
low good airß ow un der neath. If the
ampliÞ er is in a closed rack, open
up the rear panel or use a quiet fan
for improved 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 ampliÞ er.
Follow these steps to isolate the main
cause of the hum; there may even be
more than one.
• If your preampliÞ er has XLR bal-
anced outputs, use them because
they offer greater immunity to
noise Þ elds.
• Remember to turn off all compo-
nents in your system, including
the ampliÞ 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 Þ rst enter
the room, so they are making no
con nec tion to the preampliÞ 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 Þ tted in line with the
coaxial cable feed. Con tact your
ca ble com pa ny or your Sun Þ re
Dealer for as sis tance.
• Disconnect all connections from
the preampliÞ 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-
Þ er, until you identify the prob lem.
• Ground loop isolators are available
for audio lines and video. You can
ask your SunÞ re Dealer for assis-
tance.
• Try moving the speaker cables
away from any power cords. Try
just one speaker, connecting it to
each ampliÞ er channel and see if
one channel is bad.