Operation Manual

45
Problem Possible cause Solution
No sound
reproduction.
Source device not producing any signal. Digital
output on the source device not activated.
Volume control is set to zero.
Please refer to device instructions and activate digital output
resp. increase volume level.
Cable not correctly connected / faulty cable. Check cable connection, maybe replace the RCA cable.
AudioMaster BT 90
hums.
Signal lines from source device to AudioMaster BT
too long.
Use a shorter signal cable.
Used signal cable is not shielded or the shielding
has been damaged (defective).
Exchange signal cable by a shielded one.
Ground loop (ripple pickup) generated. A ground loop can be generated when two or more devices
connected via a signal line (cinch) are plugged into sepa-
rate sockets (e. g. amplifier and computer). Plug all devices
connected to the AudioMaster BT 90 into a multiple socket
output using safety plugs.
Another piece of equipment on the same circuit
has no interference suppression
(e.g. fridge).
Switch off possible sources of interference to test. Unplug
the device concerned to see if the humming noise disappears
or connect the source of interference to a different circuit
(L1, L2 or L3). (Where necessary take advice from your
electrician.) Insert a special “ferrite common mode filter”
(available from specialist retailers) between the amplifier
and the AudioMaster BT 90 to eliminate the humming. Turn
the power plug round to reduce the so-called ripple voltage
(particularly important if the source device is not earthed).
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