Studer OnAir 3000, Operating Instructions Manual

Page: 6 / 372

Installation/Maintenance/ESD
IV
tor) and that also takes into consideration the EMC requirements. When
deciding between radial, surface, or combined grounding, the advan-
tages and disadvantages should be carefully evaluated in each case.
• Use shielded cables where shielding is specified. The connection of the
shield to the corresponding connector terminal or housing should have a
large surface and be corrosion-proof. Please note that a cable shield
connected only single-ended can act as a transmitting or receiving an-
tenna within the corresponding frequency range.
• Avoid ground loops or reduce their adverse effects by keeping the loop
surface as small as possible, and reduce the noise current flowing
through the loop by inserting an additional impedance (e.g. common-
mode choke).
• Reduce electrostatic discharge (ESD) of persons by installing an appro-
priate floor covering (e.g. a carpet with permanent electrostatic fila-
ments) and by keeping the relative humidity above 30%. Further meas-
ures (e.g. conducting floor) are usually unnecessary and only suitable if
used together with corresponding personal equipment.
• When using equipment with touch-sensitive operator controls, please
take care that the surrounding building structure allows for sufficient
capacitive coupling of the operator. This coupling can be improved by
an additional, conducting surface in the operator’s area, connected to the
equipment housing (e.g. metal foil underneath the floor covering, carpet
with conductive backing).
C Maintenance
All air vents and openings for operating elements (faders, rotary knobs)
must be checked on a regular basis, and cleaned in case of dust accumula-
tion. For cleaning, a soft paint-brush or a vacuum cleaner is recommended.
Cleaning the surfaces of the unit is performed with a soft, dry cloth or a
soft brush.
Persistent contamination can be treated with a cloth that is slightly humidi-
fied with a mild cleaning solution (soap-suds).
For cleaning display windows, commercially available computer/TV
screen cleaners are suited. Use only a slightly damp (never wet) cloth.
Never use any solvents for cleaning the exterior of the unit! Liquids must
never be sprayed or poured on directly!
For equipment-specific maintenance information please refer to the corre-
sponding chapter in the Operating and Service Instructions manuals.
D Electrostatic Discharge during Maintenance and Repair
Caution:
Observe the precautions for handling devices sensitive to electrostatic
discharge!
Many semiconductor components are sensitive to electrostatic discharge
(ESD). The life-span of assemblies containing such components can be
drastically reduced by improper handling during maintenance and repair
work. Please observe the following rules when handling ESD sensitive
components:
• ESD sensitive components should only be stored and transported in the
packing material specifically provided for this purpose.
• When performing a repair by replacing complete assemblies, the re-
moved assembly must be sent back to the supplier in the same packing