Rodec PA1600, Operating Instructions Manual

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RODEC
PA 800
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PA 1600
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PA 2400
6
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The limiter switch (F) should normally be set on position “on”. In this position the internal
limiter circuit will be activated. On the position “defeat”, the limiter circuit will be switched
off.
3)
Then switch all the other equipment on (like CD-players, mixing panels, effect processors,
equalizers, cross-overs, etc.). Then switch the power button (1) to turn the power supply on.
The power indicators (2) will light up and a few seconds later the amplifier will be in operation,
ready state.
4)
Then turn the level adjusters (6) up. In “stereo” and ”parallel” mode, both level adjusters must
be set. In “bridge” mode, only level adjuster of channel 1 is used to set the desired level, the
level adjuster of channel 2 must stay in fully counter-clockwise position.
These adjusters must be set depending on the level of the input signal as follows:
For an input signal of 1.1V the level adjuster must be set on 0dB; 1.2V on -1dB; 1.4V on -2dB;
1.6V on -3dB; 1.8V on -4dB; 2.0V on -5dB; 2.2V on -6dB; 2.4V on -7dB; 2.6V on –7dB; 2.8V
on -8dB; 3.0V on -9dB; 3.2V on -9dB; 3.4V on -10dB; 3.6V on -10dB; 3.8V on -11dB; 4.0V on -
11dB; 4.2V on -12dB; 4.4V on -12dB; and so on. If the input signal is smaller then 1.1V, the
signal cannot drive the amplifier to the maximum output power unless the input signal is pre-
amplified first.
If the clip indicators (4) on the front panel light up constantly, the level adjusters must be
turned down (more counter clockwise) to prevent damadge to the connected speakers.
5)
Maintenance of the amplifier is required. How often depends on the environment the unit is
being operated in. If this happens to be a dusty environment, the heat-sinks should be
cleaned by blowing out the accumulated dust with compressed air at least once a year.
The air filters (7) should be cleaned periodically by washing them in soapy water and rinsing
them with clean water. There are no other maintenance routines required and no internal
adjustments are needed during the life time of the amplifier.
PROTECTION SYSTEMS
I)
DC & THERMAL PROTECTION
When the temperature of a channel’s heat-sink reaches 85 degrees centigrade or a DC
voltage is being sensed on the channel’s input, that channel will automatically disconnect the
speaker and the red DC & TEMP LED (5) will light-up. Once the heat-sink temperature cools
to 75-80 degrees the unit will automatically resume normal operation.
Protection from DC voltage can however also be the result of an internal fault condition and
might require the services of a technician.
II)
TURN-ON / OFF PROTECTION
During power-up, connection of the amplifier’s outputs is delayed for about 3 to 5 seconds.
When the amplifier is switched off the output relays are synchronized with the power switch
turn-off. This way no thumps, cracks or pops are present during turn-on or off.
III)
SHORTED OUTPUT PROTECTION
When a short circuit condition is present on the outputs this protection circuit will instantly
reduce current flows to safe levels. Once the short circuit condition is removed the unit will
automatically resume normal operation.