Operation Manual

41
English
Problem Possible cause Solution
musicbox M hums. 1. Signal lines from the source device to the
musicbox M is too long.
Use shorter signal lines.
2. Signal line used is not shielded or shield is
interrupted at the line used (defective).
Replace line with shielded line.
3. Earthing loop (ground loop) “generated”. An earthing loop may result when at least two devices
connected with signal lines (cinch) with protective contact
plug (e. g. amplifier and computer) are connected to locally
separated sockets. Connect all devices connected to the
musicbox M with protective contact plug to the socket strip
(multiple outlet).
4. A consumer without interference suppression
(e.g. fridge) at the mains.
Switch off possible interference sources for testing; have
interference suppression applied to the respective device
if the hum vanishes or connect the inference source to
another mains phase first (L1, L2 or L3) (bring in a specialist
if required).
Switch a special “jacket current filter” (available in specialist
trade) between source device and musicbox M to eliminate
the hum.
Turn the mains plug to reduce the so-called ripple voltage
(particularly important if the source device is not earthed).