Bogen CAM8 User Manual download pdf (Page 24)

Troubleshooting Tips

NO POWER

Check the connections between the mixer and the power supply and the external AC power

supply. Examine the 4-pin connector as shown on page 23.

Check the wall outlet.

NO SOUND

• Make sure the MIC/Line switch is in the proper position. (This is the most likely

cause.)

• Make sure both the master and channel input controls are turned up.

• Check that the source signal cable(s) is properly connected and undamaged.

• Adjust Input Gain/Trim Control potentiometer(s) to increase gain.

• If there is still no sound, try changing input source(s) to different channel(s).

DISTORTED SOUND

• Turn down the master volume control. If distortion persists, input channel(s) gain

is the likely cause.

• Check position of all line/mic switches.

• Determine the distorting input channel(s) by checking them one at a time.

• Decrease gain of input channel(s) causing distortion by turning the screw on the

rear panel.

EXCESSIVE HISS or HUM

Hiss: Make sure the volume control knobs for all the unused channels are turned all the way

off (i.e., at the 7 o’clock position).

• Make sure that all unused input channels have the MIC/Line switch in the Line

position.

• Make sure the MIC/Line switch is in the correct position for both the inputs and

the main output.

Hum: MIC lines can easily cause hum. Make sure to locate them away from vibration and

magnetic field sources (motors, power supplies and lines, and data lines).

Check MIC lines, especially the shield, for damage.

Another common source of hum is a ground loop, which can result from connecting two or

more powered devices together.

Turn both the Main and Auxiliary volume controls down. If the hum is still present, the ground

loop or other cause is not in the mixer, but in the devices after it in the audio path or in the

connection between the mixer and following equipment. [(If the hum disappears, then the

cause is either in the mixer or in one of the inputs to the mixer. Turn each of the volume

controls (both the individual input channels and the two buses) down independently, to deter-

mine which one is the source of the hum.)]

Check for unbalanced connections; use balanced connections, if possible. For all unbalanced

connections, try disconnecting the signal line ground to eliminate multiple ground paths.

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Bogen CAM8 User Manual Page 24