Owner`s manual

Ci
TM
owner’s manual
Amplifier Operation
For replacement
packaging, call Crest
Audio’s Customer
Service.
+
Because of the complexity
of the design and the risk of
electrical shock, all repairs
must be attempted only by
qualified technical personnel.
If the unit needs to be
shipped back to the factory,
it must be sent in its original carton.
If improperly packed, your amplifier
may be damaged..
+
a
Thermal Protection
If the temperature of the amplifier’s output devices becomes abnormally high, the Ci
will protect itself by opening its output relays (disconnecting itself from its load) and
shutting down the amplifier’s output stage. The Protect LED will light if this occurs.
If the power transformer gets too hot, its thermal sensing circuit will disconnect
both channel outputs. The Active LED will extinguish and the Protect LED will again
illuminate. In either case, the fan will remain running to cool down the amplifier.
Once adequately cooled, the amplifier will resume operation automatically.
Short Circuit
If an output is shorted, the IGM and thermal circuits will automatically protect the
amplifier. The IGM circuit senses the short circuit as an extremely stressful load
condition and attenuates the signal, protecting the channel’s output transistors from
over-current stress. If the short circuit remains, the load will be disconnected by the
thermal protection circuitry (See Thermal Protection above).
DC Voltage Protection
If an amplifier channel detects DC voltage at its output terminals, the output relay
will immediately open to prevent loudspeaker damage. The Protect LEDs will light.
AutoRamp Protection
AutoRamp gradually increases the amplifier gain from -∞ to the attenuator setting
every time the amplifier is turned on or is reactivated after a protect condition. This
exclusive Crest feature avoids unnecessary stress on the loudspeakers by preventing
sudden bursts of audio from arriving at the amplifier’s output after its output relays
initially close.
NexSys Fault Monitoring
A Ci equipped with an NxEthernet8 or NxCobraNet8 module and connected to
a NexSys network will report fault conditions to the PC controlling the network. If
a networked amplifier enters ACL or IGM or experiences a thermal, DC voltage, or
short circuit fault, the fault condition will be reported the PC interface. This allows
easy monitoring of amplifier operating conditions across a large or widespread
network from a single location.
Service Information.
For service, contact your nearest Crest Audio Service Center, Distributor, Dealer,
or any of the worldwide Crest Audio offices, or contact Crest Audio Inc. Customer
Service directly at: TEL. [phone] (USA) Fax. [phone] (USA)
Technical Inquiries
For technical inquiries only, the Crest Audio Technical Services Dept. can be faxed at
201.587.0550 (USA). Crest Audio may also be contacted on the World Wide Web
at: http://www.crestaudio.com.