TROUBLESHOOTING GUIDE continued
TROUBLE
Bass from sub does not
blend with other channels
Hum and/or buzz heard
through speakers or
headphones
Sound does not
get loud enough
Some headphones do not
work with 7100
Surround modes
unavailable
THX modes not available
Poor composite video image
Audible dialog is out of
sync with speakers’ lip
movements when
playing a DVD
No sound or picture in
remote zone
REMEDY
Reverse polarity on sub amplifier
Check all audio interconnect cables in affected
channel or coming from affected source
Disconnect your home theater system from the
cable outlet. If the noise goes away, install a TV
cable ground interrupter
Move the ground switch on your power amplifier(s)
to the “lift” position. Isolate the source component
causing the hum. Disconnect sources one at a time
and listen for hum each time. Press the 7100 mute
button before you remove an input plug and mute
the 7100 after the plug is out. When you’ve discon-
nected a source and the hum disappears, recon-
nect all of the other sources again. Contact your
dealer about modifying the cable used to connect
that component to break its grod path. If the 7100
and other components are rackmoted, use insu-
lated shoulder washers to prevent metal-to-metal
contact between each component’s chassis or rack
brackets and the rack rails
Enter setup Menu and reduce bass and/or treble
trims
Enter setup Menu and bring all speaker levels
closer to 0dB
Replace amplifier and speakers with THX Ultra2
equipment
Get 3.5-mm stereo extension cord with
thinner plug body
Change “Size” entries in Speaker
Setup from
“No” to “Small” or “Large”
Consult mode table in “Using Main Controls”
Use video cable (with yellow plugs), not audio cable
Go to setup menu, then select Audio Setup,
select Preset, select Lipsync, turn on and
adjust as required
Turn remote zone on
Run analog audio and composite video connections
from source components to the 7100 inputs
PROBABLE CAUSE
Sub polarity is incorrect
Defective audio interconnect
cable
Ground loop with TV cable
system
Ground loop among your
components
Treble or Bass adjustments
are set very high
Speaker levels are
calibrated too low
Amplifier and/or speakers
are not THX ultra2 certified
Plug body too fat for
front-panel hole
Surround amps or speakers
not entered in Setup
Inapplicable mode or
speaker setup
Wrong cable type
Lipsync setting not
properly adjusted
Remote zone turned off
Only the 6 analog inputs and
composite video inputs are
available in remote zone
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