51-0156-0100 M07-05 COMPACT8 Àngles.doc 3 of 4
VERIFICATION
1.
Connect the mixing console to the 230Vac mains socket.
2.
Turn ON the main power switch and check it’s LED, as it should light up.
3.
The unit’s output signal will be checked at it’s REC output.
4.
Before applying any input signal, verify that when manipulating and switching the input selection
knobs (LINE A - LINE B (PHONO) – MICRO), the output signal carries nothing but the normal
background noise. The output signal must be free of hum, whistles and beeps. When selecting
LINE B, check also this point by switching the backside PHONO selector.
5.
Connect a CD player as input music signal source to channel 1’s LINE A.
6.
Check that the signal present LED (SP) lights up on this channel.
7.
Watch the Vu-meter. It should display approximately a 0dB level on both L and R channels.
8.
Verify the GAIN (
±
20dB) control knob sweep.
9.
Verify the PEAK-indicating LED, it should light up when GAIN is turned up to its maximum.
10.
When forcing all the LED’s of the Vu-meter to light up, check that all the LED’s get lit.
11.
Verify that the Vu-meter level changes the same way the output signal does as the FADER is
manipulated.
12.
When sweeping up and down the FADER, verify that it does not scratch or hang at any point, and
that when the FADER is left down to its minimum level the attenuation is enough to cut off
completely the output signal. Slide up again the FADE to its maximum level.
13. The
f
0
Hz adjustable control knob shifts the MID tone filter central frequency, to values from 300Hz
to 6k5Hz.
14.
Verify the correct function of the tone control commands, included the semi-parametric f
0
Hz filter.
15.
Verify the PFL signal send.
•
Connect headphones plugging into the jack connection.
•
Slide down the FADER 1 control to its minimum position.
•
The output signal sent through the headphones should be cutted off.
•
Press PFL and check that the input signal can be heard through the headphones, as the
phones indicating LED lights up.
•
The Vu-meter should display approximately a 0dB level.
•
Verify the headphones volume control knob.
•
Release the PFL pushbutton.
16.
Input selector switched to LINE B (PHONO)
•
Swap the music source connecting it to LINE B.
•
Turn FADER 1 up to its maximum position.
•
Verify that the output signal is correct.
•
By using the rear panel selection switch, choose PHONO as input signal through LINE B.
•
Connect a pick-up to LINE B’s PHONO input.
•
Verify the RIAA filter frequency response, the good sound quality and a good balance
between bass and treble tones.
17.
Input selector switched to MICRO
•
Connect a balanced microphone with phantom power supply to the unit’s rear XLR-type
terminal.
•
Switch ON the PHANTOM power supply (by the rear panel switch).
•
Speak into the microphone and verify the sound quality.
•
Verify the MIC ATT function by switching the rear side selector.
•
Verify the good common mode rejection level, by checking a good and clear sound quality,
free of hums, scratches and other type of noise).
Note: the input ports are combo-type (XLR+JACK) connectors, so on each of them both input connection
types have to be checked. On the other hand, when turning off the PHANTOM supply, the MIC input
should not function.
