Canton Digital Movie 50 Operating Instructions Manual page 41

Problem Possible cause
DM System hums. 1. Signal lines from source device to DM System
too long.
2. Signal line used is not fault-protected or the
protection has been damaged (defective).
3. ground loop (ripple pickup) generated.
4. Another piece of equipment on the same
circuit has no interference suppression
(e.g. fridge).
Solution
1. use shorter signal line.
2. Change signal line for a fault-protected line.
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. 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