108
Troubleshooting
Hum on analogue input
There is no reason for the 561 to produce hum on the analogue
input.
❍
Check the source equipment. Disconnect each source in turn.
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If the hum originates from a ground loop, an antenna or cable
supply may be the cause. In this case an antenna-lead isolator
should be fitted.
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If the 561 seems to be the cause of hum consult your dealer.
Poor sound quality
Poor sound quality will usually result from driving an analogue
input too hard.
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Turn down the analogue input level.
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To optimise this use Gain/Sub mode; see
To adjust the
sensitivity of analogue sources
, page 76.
There is radio interference
The 561 is a digital audio and computing device which has been
designed to very high standards of electromagnetic
compatibility.
If this equipment does cause or suffer from interference to/from
radio or television reception then the following measures should
be tried:
❍
Reorient the receiving aerial (or antenna) or route the antenna
cable of the receiver as far as possible from the 561 and its
cabling.
❍
Ensure that the receiver uses well-screened antenna cable.
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Relocate the receiver with respect to the 561.
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Connect the receiver and this product to different AC outlets.
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If the problem persists contact your dealer.
Audio problems
