ASL INTERCOM V400 Installation Manual page 23

Ground Loops
It is possible to form a ground loop (earth loop or hum
loop) when connecting pieces of audio equipment using
unbalanced connections that provide alternative earth
connections via their cable screens.
Such ground loops result in audible 'hum' from the
system.
Never disconnect the mains earth from
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the plug to attempt to cure a ground loop.
In the event of a fault, the equipment
casing could become live.
Unpacking and Handling
The equipment should be unpacked and inspected
immediately on receipt. If damage has occurred please
advise your carrier or supplier.
This equipment contains electronic
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devices that are sensitive to electrostatic
discharge. Please take precautions to
avoid damage to the electronics by static
electricity.
It is advisable to retain the original equipment packing
in the event that the equipment ever needs returning for
service.
Ensure that the name and address of the Authorised
Distributor from whom you purchased the unit is
recorded on the "Service and Warranty" page of this
manual for future reference.
V400 – Installation Guide
Packing for Return for Repair
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Advice on packing the product for return can be
provided by ASL.
U-0398-0607.doc – Issue: 03 complete, approved
Page 23 of 24
All electronics assemblies must be
properly packed in ESD protective
packing for transport, to prevent physical
and ESD damage.
The filler material used for packing for
return for repair must be antistatic or
static dissipative, as this may come into
contact with exposed connectors, wiring,
or PCB assemblies. The use of non-
conductive filler material may cause
damage to the electronic assemblies
reducing their operational life, or even
destroying them.