Crown ma-1202 Manual De Usuario

The amber Enable indicator is provided to 
show that the amplifier has been turned on (or 
enabled), and that its low-voltage power supply 
and forced-air cooling system are working. It 
does not indicate the status of the high-voltage 
power supplies. For example, the Enable indi-
cator will remain lit during unusual conditions 
that would cause the amplifier's protection sys-
tems to put a high-voltage power supply in 
"standby" mode (see Section 5.1.2).

The amber ODEP indicators confirm the nor-
mal operation of Crown's patented Output 
Device Emulation Protection circuitry. During 
normal operation, they glow brightly to show 
the presence of reserve thermal-dynamic 
energy. They dim proportionally as the energy 
reserve decreases. In the rare event that there is 
no reserve, the indicators turn off and ODEP 
proportionally limits the drive level of the out-
put stages so the amplifier can continue safe 
operation even when conditions are severe. 
(For a more detailed description of ODEP, see 
Section 5.1.1.)

The ODEP indicator for the affected channel will 
turn off if a high-voltage power supply is put in 
"standby" mode, a high-voltage power supply 
fuse (or breaker) blows, or a transformer acti-
vates its thermal protection circuitry (see Sec-
tion 5.1.3). Both ODEP indicators turn off if the 
amplifier loses AC power, the power switch is 
turned off or the low-voltage power supply fuse 
blows.

The green Signal/IOC indicators show sig-
nal presence and distortion. As signal presence 
indicators, they flash with normal intensity in 
sync with the output audio signals. As IOC 
(Input/Output Comparator) indicators, they 
flash brightly if there is any difference between 
the input and output signal waveforms greater 
than 0.05%. Because transient distortion hap-
pens quickly, a 0.1 second "hold delay" keeps 
the indicators on long enough to be easily 
noticed. The IOC function essentially provides 
proof of distortion-free performance. Note: The 
Channel 2 IOC indicator will remain lit when 
running in Parallel-Mono mode.

Under conditions where one of the amplifier's 
high-voltage power supplies is temporarily put 
in standby mode, the Signal/IOC indicators will 
stay on with full brightness. They will resume 
normal operation when the amplifier is no 
longer in standby mode.