Crown CE 2000, Reference Manual

Page: 43 / 52

Page 43
CE-Series Amps with an Attitude!
down the amplifier. It also disconnects the load via the output
relay, removing any output current and further speeding a cool-
down cycle. Extra care was taken during the design stage to
set this point both to protect your investment and to to guard
against nuisance tripping.
Whenever the heatsinks or the transformer reach a maximum
temperature, or during the normal turn on delay window, the
front panel Fault LEDs will blink to get your attention.
A modular jack is mounted on the back panel (same type as
used on telephones). Pins 2 and 5 are connected to an opto-
isolator which is always in a low-resistance state whenever the
unit is on and happy. Should a fault be detected or should the
amplifier lose AC power, the opto-isolator will change to a high
resistance, allowing the user to remotely detect the status of
the amplifier.
The Signal Presence Indicators tap the signal chain just be-
fore the level controls and prior to the power amplifier chain.
They are
not amplifier output indicators and should only be
used to indicate the presence of signal to the amplifier front
end.
The Clip light is driven from the output of the compressor cir-
cuitry and lights to indicate the onset of audible distortion.
The Power LED is driven from the low-voltage supply.
A positive and negative regulator form the ±15-volt power sup-
plies. Add to that the main transformer, a full-wave bridge rec-
tifier, and high energy electrolytics to form the main power
supply. They are protected by the front-panel line circuit
breaker and controlled by the front-panel power switch.
And there my friends you have it, the guts of the CE 1000/CE
2000 from Crown Audio!