VI
• Use a system grounding concept that satisfies the safety requirements
(class I equipment must be connected with a protective ground conduc-
tor) and that also takes into consideration the EMC require ments. When
deciding between radial, surface, or combined grounding, the advantages
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 con-
nected only single-ended can act as a transmitting or receiving antenna
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 appropri
-
ate floor covering (e.g. a carpet with permanent electrostatic filaments) and
by keeping the relative humidity above 30%. Further measures (e.g. con-
ducting floor) are usually unnecessary and only effective 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 conduc-
tive 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 accumulation. 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
humidified
with a mild cleaning solution, such as dishwashing detergent.
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 manuals.
D
Electrostatic Discharge during Maintenance and Repair
Caution:
Observe the precautions for handling devices sensitive to electrostatic dis-
charge!
Many semiconductor components are sensitive to electrostatic discharge
(ESD). The lifespan of assemblies contain ing such components can be dras-
tically reduced by improper handling during maintenance and repair. 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.
EMC / Maintenance / ESD
