Crown Audio CDI2000 Manual Do Utilizador

NOTE: For detailed information about these Crown 
amplifier features, please consult the Crown 
Amplifier Application Guide, available on the Crown 
website at www.crownaudio.com.

4.1 Protection Systems
Your Crown amplifier provides extensive protection and 
diagnostic capabilities, including output current limiting,  
microprocessor-controlled DC protection, and special 
thermal protection for the unit’s transformers and output 
devices.

4.1.1 Output Current Limiting
Output Current Limiting circuitry protects the amplifier 
output stage from damage caused by short-circuit loads.

4.1.2 DC Protection
DC Protection shuts down the amplifier in the event of an 
output DC offset exceeding 2V. In the majority of cases, DC 
protection is indicative of a faulty amplifier channel, and will 
be accompanied by an illuminated red Clip LED, even with 
no input connected and level controls set at minimum 
(Figure 4.1). If this is the case, contact your dealer or 
service center.

4.1.3 Thermal Protection
The Thermal Protection circuit will activate if the internal 
heatsink temperature exceeds proper operating 
tempera tures (176°F, 80°C). When the heatsink 
temperature has fallen to a safe level, this protection circuit 
will automati cally be reset. Principal causes of thermal 
protection are: 

1) Inadequate ventilation of the equipment rack 
2) Incorrect load impedance 
3) Output cable short circuit 
4) Blocked air vent 
5) Heatsinks in need of cleaning 
6) Cooling fan failure.

The cause of your amplifier’s thermal protection state 
should be determined and corrected as soon as possible. 

4.1.4 Non-Touch Cover
Located over the amplifier output terminals, this included 
accessory provides a shock-proof cover for the output 
ter minals. 

1. Remove the screw holding the cover onto the amplifier 
back panel, and remove the cover. Keep the screw.

2. The cover has two tabs A and B (Figure 4.2). Insert tab 
A into the slot just to the left of the output terminals 
(Fig ure  4.3). 

3. Put the screw through tab B, and screw it into the hole 
just to the right of the output terminals (Figure 4.3).

4.1.5     Attenuator  Security  Covers
The included attenuator security covers (Figure 4.4) can 
replace the existing level-control knobs so that the 
ampli fier output level cannot be changed. The knobs 
snap into the front panel.