Front Panel - TECNARE MH-4000 Owner's Manual

Front Panel£
Power switch
ON
Press to toggle the power on or off.
OFF
POWER
Fault LED
Lights up red to indicate that protection is in effect. Specifically, lights up if the heat sink
Fault
overheats, or if a DC voltage is detected at the amplifier outputs. Also lights up for about
Three seconds at time of power-on, as the amp gets ready to operate. To provide protection,
the unit will not output any sound from the speakers while this indicator is lit up. When
Start-up is completed or the problem is corrected, the indicator goes off and normal oper
-ation resumes.
Clip LED
Lights up orange when the output signal distortion on the corresponding channel rises above
Clip
1% -indicating that"clipping" has occurred because the signal level is too high.
Signal LED
Normal indication: The -30dB indicator illuminates when the signal exceeds -30dB, and
the -10dB indicator illuminates when the signal exceeds -10dB.
-10dB
If no iddication: check gain settings and increase gain if necessary. Check input conn
-30dB
-ections and audio sourece for signal. If the Clip LED illuminates with little or no Signal
Indication, check the output wiring for shorts.
Abnormal indication: if -20dB, -10dB LED illuminates with no signal input, there may be
system oscillations or some other malfunction. Disconnect the load and fully reduce the
gain. If the LED remains on , the amp may need servicing.
Power LED
Power
Normal indication: AC switch ON, LED will illuminate.
If no indication: Check AC outlet.
Gain Controls
Turn the gain controls clockwise to increase gain and counter clockwise to decrease gain.
The maximum voltage gain of the amplifier varies depending on the model is shown of the
designation. Maximum voltage gain for each model is shown on the front panel label in
parentheses adjacent the 0dB attenuation setting.
CH-A
The Gain controls are marked in dB of attenuation.There are 21 detents for repeatable
adjustments. The upper 14 steps ate about 1dB each, and settings should normally be
made within this range. The range below -14 dB should not be usde for normal program
levels, as the input headroom could be exceeeded, but can be used for thesting at reduced
levels. At the minimum setting, the signal is completely cut off.
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