Operating Manual - PQX 571 and PQX 572 Parametric Equalizer
8.TROUBLESHOOTING TIPS
8.1No Output
Check AC power - is the Power LED on? Check in/out connections
8.2Eq Controls Do Nothing
Is the master EQ in/out switch in? Maybe the bandwidth setting is too sharp to produce an audible change. The center frequency and bandwidth controls do not have an effect if the level control is set at “0”, or if the in/out switches are switched out.
8.3Clip Light Flashes or Stays On
If the clip light flashes, the signal level to the equalizer is too high. Turn down the level on the unit feeding the PQX equalizer. If the clip LED is on all the time, disconnect the input and output cables. If it is still on, the unit must be returned for service.
8.4Distorted Sound
This will only be caused by too much signal which will show on the clip light. If the light is not flash- ing, there is an overload somewhere else in the signal chain. Adjust the gain of each component in your signal chain until the unit which is distorting is found.
8.5Excessive Hum or Noise
Hum will usually be caused by a “ground loop” between components. Try using the suggested balanced input and output connections if the other pieces of equip- ment used in conjunction with your equalizer have bal- anced inputs and outputs. Noise (too much hiss) can be caused by insufficient drive signal. Make sure you are sending a nominal 0 dBu line level signal to the equal- izer.
The input ground to chassis ground jumper strap supplied with the equalizer should normally be left in place to minimize ground loop voltage and for safety reasons. If hum or buzz noise is still heard after you have installed balanced input and output connections using good quality shielded cable, the ground strap may be removed to re- duce hum caused by ground loop current.
Note: unshielded cables, improperly wired con- nections, and cable with broken strands (shorts, etc.) are the most common problems. Make sure you use good qual- ity cable with connectors soldered firmly on the correct pin. When in doubt, get in touch with your Ashly dealer, or call the factory direct - (800)
9.DIMENSIONAL DIAGRAM
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