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Problem Possible cause Solution
DM System hums. 1. Signal lines from source device to DM System
too long.
1. Use shorter signal line.
2. Signal line used is not fault-protected or the
protection has been damaged (defective).
2. Change signal line for a fault-protected line.
3. Ground loop (ripple pickup) generated. 3. A ground loop can be generated when two or more
devices connected via a signal line (cinch) are plugged
into separate sockets (e. g. amplifier and computer). Plug
all devices connected to the DM System into a multiple
socket output using safety plugs.
4. Another piece of equipment on the same
circuit has no interference suppression
(e.g. fridge).
4. Switch off possible sources of interference to test; unplug
the device concerned to see if the humming noise disap-
pears 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 DM System 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).
English
41


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