Arcam AVR250 Handbook page 30

Hum on an analogue input:
Check that:
n
n
n
n
There is radio or television reception interference:
n
n
n
n
The source switching changes randomly or freezes on
one source:
Check that:
n
Volume is always too loud when I turn the system on
for the main zone or Zone 2:
Check:
n
You can't select a particular input in Zone 2:
Check that:
n
When Zone 2 is put into stand-by, the main zone is
also turned off:
Check that:
n
Unstable OSD on screen display:
The AVR250 defaults to the NTSC video standard for US
units and PAL for European units.
If your display device is unable to display the default video
standard, attach a source component the generates the
video standard you wish to use; the AVR250 will switch
automatically to the supplied video standard when the
source is selected.
No Zone 2 audio when playing DTS film:
Most two-channel DVD players cannot output a stereo
decoded version of the DTS signal – the analogue outputs
are muted when playing back DTS films. If you want to
watch a DVD in both the Main zone and Zone 2, please use
the Dolby Digital sound track.
No centre image (vocal) in Zone 2 when using the
multi-channel input:
Most DVD/SACD players are unable to provide a two-channel
down-mix of source material at the same time as decoding
a multi-channel audio stream. Therefore, only the front
left and right channels from the multi-channel mix will be
available in Zone 2.
To overcome this, play the stereo mix from the DVD-audio
disc instead.
AVR250
E-30
all cables are making a good connection. If necessary
withdraw the cable from the connector and plug it fully
in again. (Turn the power off before doing this.)
the connections inside the source cable connector are
not broken or badly soldered.
if the hum originates only when one particular source
component is connected, that an aerial, cable or dish
connection to this source is ground isolated. Contact
your installation contractor.
try switching the ground lift switch on the back panel.
check where the interference is coming from. Switch
off each source component in turn, then any other
equipment. Most electronic equipment does generate
low levels of interference.
try re-arranging cabling from the nuisance source away
from other cabling
ensure that the cabling used is high quality, specified
for its purpose, and is properly screened.
if the problem persists contact your installer.
there are no static or impulse interference problems
caused by nearby power equipment switching, e.g.,
heating or air conditioning control. Switch the AVR250
off, wait ten seconds, then switch it on again to clear
an operating problem. Contact your installer if the
problem returns or persists.
the 'Max On Volume' line of 'General Settings' or
'Zone 2 Settings' pages in the Set-up Menu. They will
need adjusting to a lower level.
you have not blocked that particular input using the
'Access' line of 'Zone 2 Settings' in the Set-up Menu.
the 'Zone 2 Stand-by' line of 'Zone 2 Settings' in the
Set-up Menu is set to Local Only.
Strange aspect ratio of video in Zone 2:
Most DVD players can only decode video to one aspect ratio
at a time. For example, if you are using wide screen in the
main zone, then wide screen information will also be fed to
Zone 2.
To overcome this, either set the film to 4:3 for the main
zone when you want to use Zone 2 as well, or change the
Zone 2 display to a wide screen capable type.
Unable to adjust bass and treble controls:
Bass and treble is not available in 'Direct' mode. For
Analogue Stereo and Digital Stereo modes, check that the
'Auto Stereo Tone Bypass' line of 'Speaker Eq' in the Set-up
Menu is set to .
NO
Digital signal drops out when other electrical
appliances turn on (heating, fridge, freezer, etc.):
If a poor quality or incorrect type of cable has been used for
the digital inputs, they can pick up electrical noise. Change
the cable to a 75Ω low loss coaxial type.
Check the connections have not oxidised. Clean the
connectors with contact cleaner if they appear oxidised.