4.7 Mains connection
The mains cable is fixed and equipped with a ground contact.
5.Setting up
After all connections such as mains, microphone and loudspeakers have been completed, follow these steps to bring the system up:
1.Turn all volume controls to “0”.
2.Turn on the source equipment.
3.Turn on the MA 212 mixer amplifier with the on/off switch (7).
4.Turn the corresponding volume control half up, with the output level control of the source equipment turned down. There should be no audible hum. If hum is heard, check the connections between the sound source and the mixer amplifier.
5.Using the volume control microphone (1) you can adjust the volume of the individual microphone inputs.
6.Using the volume control master (4) the desired volume in the room is adjusted.
7.The volume of the sound carrier input is adjusted with the volume control (2) independent of the master volume control.
8.Activate a signal.
9.Slowly turn up the source equipment input gain controls until you begin to hear the sound source from the loudspeakers connected to the amplifier. If the sound is clear and undistorted, adjust the system level to the desired listening levels.
10.If you want the ducking function of the microphone inputs 1 and 2, it has to be activated (refer to chapter “4.1.1 Priority switching”).
6.Trouble Shooting
Problem |
| Possible Cause |
| Solution | |
No reproduction |
| • The power switch is not switched to the |
| • Switch the power switch to the ON | |
|
| ||||
|
| ON position |
| position | |
|
| • The AC plug is not connected |
| • Connect the AC plug properly | |
|
| • The AC power source is defective |
| • Locate and correct the AC mains | |
|
|
|
| problem | |
|
| • Defective fuse |
| • Check and exchange the fuse | |
|
|
|
|
|
|
No or distorted sound |
| • Volume control is set to “0” |
| • Turn the volume control up | |
|
| • There is a short circuit on the loudspeaker |
| • Locate and correct the short circuit | |
|
| output |
|
|
|
|
| • Input level is too high |
| • Reduce output level of the sound | |
|
|
|
| source (for sound carriers) | |
|
| • The loudspeaker impedance is too low |
| • Make sure that the impedance is not | |
|
|
|
| below 4 Ω | |
|
| • There is too much loudspeaker load on the |
| • Check the loudspeakers, disconnect | |
|
| output |
| one if necessary | |
|
|
|
|
|
|
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