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Operating Manual - PQX 571 and PQX 572 Parametric Equalizer
8
8. TROUBLESHOOTING TIPS
8.1 No Output
Check AC power - is the Power LED on? Check
in/out connections -are they reversed? Are you sure you
have an input signal?
8.2 Eq 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.
8.3 Clip 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.
8.4 Distorted 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.
8.5 Excessive 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) 828-6308.
9. DIMENSIONAL DIAGRAM