Crown 1400 CSL Manual de referencia - Página 10

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This protection circuitry is activated in unusual situa-

tions where the unit's transformer temperature rises to

unsafe levels. Under these abnormal conditions, the

unit removes power to the high voltage transformer (the

fan will also run in 120 VAC, 60 Hz units). The amplifier

will return to normal after it cools to a safe temperature.

It is very unlikely that you will ever see a CSL amplifier

activate transformer thermal protection as long as it is

operated within rated conditions. The amplifier is de-

signed to keep working under conditions where other

amplifiers would fail. But even when the limits of a CSL

are exceeded, it still protects itself—and your invest-

ment—from damage.

3.3.5 Fuses and Circuit Breakers

The power supplies for the 460 CSL and 800 CSL are

protected by fuses, while the power supplies for the

1400 CSL are protected by a circuit breaker. With rated

loads and output levels, these fuses (or the circuit

breaker) should only shut down the amplifier in the in-

credibly rare instance of a catastrophic amplifier fail-

ure. Other protection systems such as ODEP keep the

amplifier operational under most other severe condi-

tions. The fuses (or breaker) can also shut down the

amplifier in situations where extremely low-impedance

loads and high output levels result in current draw that

exceeds their rating. Again, this should only be pos-

sible when operating outside rated conditions , such as

driving a 1 ohm load or overloading the input and cre-

ating a severely clipped signal.

All 120 VAC, 60 Hz units and all 1400 CSL units have a

separate fuse for the low-voltage power supply and

cooling fan. Additionally, all units have separate fuses

(or a breaker) for the high-voltage power supplies.

A CSL amplifier will not blow its fuses (or breaker) un-

less something is wrong. In the rare event that an inter-

nal fuse blows, please refer the unit to a qualified

technician. If the breaker in a 1400 CSL trips, try to iden-

tify and correct the problem before resetting the breaker

with the back panel reset switch. If the problem per-

sists, refer the unit to a qualified technician.

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3.4 Controls

The enable switch is located on the front panel so you

can easily turn the amplifier on and off. When making

any setup or wiring changes, don't forget to turn off the

amplifier, turn down the level controls and disconnect

the power cord. The back panel stereo/mono switch

is used to select Stereo, Bridge-Mono or Parallel-Mono

operating modes (see Sections 2.1 and 2.2). The level

controls are also located on the back panel. Be sure to

leave channel 2 turned down when using Bridge-Mono

mode. The back panel ground lift switch isolates the

phone jack input grounds from the chassis ground to

help prevent ground loops. It does not affect any in-

stalled input accessories. The input sensitivity switch

is located inside the back cover plate. It is used to set

the amplifier's input sensitivity (see Section 2.3). And

the 1400 CSL has a back panel reset switch that is

used to reset the breaker that protects the amplifier's

power supplies (see Section 3.3.5).

CHANNEL 2

LEVEL CONTROL

CH-2

INPUT GROUND LIFT

LIFT

INPUT

GAIN

(AFFECTS PHONE INPUTS ONLY.)

Fig. 3.1 Back Panel Level Controls

3.5 Filter Cleaning

A dust filter is provided on the unit's air intake. If it be-

comes clogged, the unit will cool less efficiently and

may produce lower output levels. To clean, remove the

three phillips screws that secure the front grille. Use

mild dishwashing detergent and warm water for best

results. New filters may be ordered from the factory.

Dust filters are not 100% efficient—depending on the

local environment, the internal heat sinks of the ampli-

fier will benefit from periodic cleaning by a qualified

technician. Internal cleaning information is available

from our Technical Support Group.

CSL Series Power Amplifiers

CHANNEL 1

LEVEL CONTROL

CH-1

INPUT

GAIN

(MONO)