Crown Com-Tech 1610, Руководство по обслуживанию

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Com-Tech 810 and 1610 Amplifier Service Manual
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2-2
Rev. 0
2.4 Indicators
Enable: This amber indicator shows the on/off status of the
unit's low-voltage power supply and the activation of the
energy-saving mode.
SPI (Signal Presence Indicator):
Each channel has a green
indicator that flashes to show audio output.
IOC (Input/Output Comparator):
Each channel has a yellow
indicator that flashes if the output waveform differs from the
input waveform by 0.05% or more. The LEDs act as sensi-
tive distortion indicators to provide proof of distortion-free
performance.
ODEP (Output Device Emulation Protection): Each channel has
a green multifunction indicator that shows the channel's re-
serve energy status. Normally, the LEDs are brightly lit to
show that reserve energy is available. In the rare event that
a channel has no reserve, its indicator will dim in proportion
to
ODEP limiting.
2.5 Input/Output
Input Connector: A barrier block on the standard PIP2-BB
with three-terminal balanced connections for input to each
channel and test points for a DVM.
Input Impedance: Nominally 20 K ohms, balanced. Nomi-
nally 10 K ohms, unbalanced.
Input Sensitivity: Settings include 0.775 volts for 8/4-ohm
output, 0.775 volts for 70-volt output, and a voltage gain of
26 dB.
Output Connector: A back panel barrier block with two-termi-
nal connections for each output channel.
Output Impedance:
Less than 10 milliohms in series with less
than 2 microhenries (see Figure 2.3).
DC Output Offset:
Less than ±10 millivolts.
RSVP: An RJ11 modular connector on the back panel inter-
faces with an RSVP to provide remote control of amplifier
power on/off functions.
2.6 Output Signal
Dual: Unbalanced, two-channel.
Bridge-Mono
: Balanced, single-channel. Channel 1 controls
are active; Channel 2 should be turned down. Channel 1 red
terminal is positive, referenced to ground, when the input is
positive.
Parallel-Mono: Unbalanced, single-channel. Channel 1 con-
trols are active; Channel 2 is bypassed.
2.7 Protection
Com-Tech amplifiers are protected against shorted,open or
mismatched loads; overloaded power supplies; excessive
temperature, chain destruction phenomena, input overload
damage and high-frequency blowups. It also protects
loudspeakers from input/output DC and turn-on/turn-off
transients.
If unreasonable operating conditions occur, the patented
ODEP circuitry proportionally limits the drive level to protect
the output devices, particularly in the case of elevated
temperature. Transformer overheating results in a temporary
shutdown of both channels. The transformer automatically
resets itself when it has cooled to a safe temperature.
Controlled by slew rate, voltage amplifiers protect against RF
burnouts, and input overload protection is provided by
current-limiting resistance at the input.
Turn On: The four-second turn on delay prevents dangerous
turn-on transients. “Soft-start” circuitry provides low inrush so
power sequencers are rarely needed with multiple units.
Note: The turn-on delay time may be changed. Contact
Crown's Technical Support Group for details.
Circuit Breaker:
Circuit breaker current ratings vary based on
the Com-Tech model and AC mains voltage.
All 100/120 VAC Units:
Com-Tech 810: 20 amperes.
Com-Tech 1610: 30 amperes.
All 220/240 VAC Units:
Com-Tech 810: 10 amperes.
Com-Tech 1610: 20 amperes.
2.8 Construction
Durable black powdercoat finish on the steel chassis, front
panel Lexan overlay, and specially-designed flow-through
ventilation from front to side panels.
Cooling:
Internal heat exchangers with on-demand forced
air cooling (fan is optional for the North American Com-
Tech 210 ).
Dimensions:
19 inch (48.3 cm) standard rack mount width
(EIA RS-310-B), 16 inch (40.6 cm) depth behind mounting
surface, and 0.25 inches (0.6 cm) in front of mounting surface.
Amplifier height varies among the available models and with
different AC power requirements (see Figure 2.10).
Height A: 3.5 inches (8.9 cm)
Models:
Com-Tech 210 (All)
Com-Tech 410 (North American)