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Owner’s Manual
Owner’s Manual
Appendix A: Service Information
Warranty Service
Details concerning Warranty Service are spelled out in
the Warranty section on page 23.
If you think your Quad EQ has a problem, please do ev-
erything you can to conrm it before calling for service.
Doing so might save you from the deprivation of your
Quad EQ and the associated suffering.
These may sound obvious to you, but here are some
things you can check. Read on:
Troubleshooting
No Power
• Our favorite question: Is it plugged in?
• Make sure the power cord is securely seated in the
IEC socket and plugged all the way into the AC
outlet.
• Make sure the AC outlet is live (check with a tester
or lamp).
• Make sure the rear panel POWER [2] switch is in
the ON position.
• Is anything on the front panel illuminated? If not,
make sure the AC outlet is live.
• Are all the lights out in your town? If so, contact
your local power company to get power restored.
• If nothing is illuminated, and you are certain that
the AC outlet is live, it will be
necessary to have
your Quad EQ serviced. There are no user serviceable
parts inside. Refer to “Repair” on the next page to
nd out how to proceed.
Bad Channel
• If one channel sounds bad, try pressing BYPASS
[14] on that channel. If it improves things, care-
fully check your settings on that channel.
• Look at the MASTER LED [9] ladder and check
and adjust the level if needed.
• Check there are no extreme settings of the EQ
lters or the high-pass or low-pass lters.
• Check that NOISE [15] is not engaged.
• Check that MIC [18] is not engaged.
• Try turning the Quad EQ off. The connections be-
tween the input and output are then joined inter-
nally, and this should allow your mixer and amps to
still play. If a channel is still missing, you may have
a bad connction cable either into or out of the Quad
EQ, or a bad mixer output or amplier.
• Try the same source signal in another channel, set
up exactly like the suspect channel.
Bad Output
• Are the MASTER [9] levels for the channels turned
up?
• If it’s one of the outputs, try unplugging the others.
For example, if it’s an XLR output, try unplugging
any TRS outputs if used. If the problem goes away,
it’s not the Quad EQ.
• If a left output is presumed dead, switch the left
and right cords at the Quad EQ end. If the problem
stays on the left side, it’s not the Quad EQ, but
maybe the left amplier channel, a bad cord, or left
speaker.
Bad Sound
• Are the input and output connectors plugged com-
pletely into the jacks?
• Press BYPASS [14] and listen for any improvement.
• If possible, listen to the signal with headphones
plugged into the input source device or mixer. If it
sounds bad there, it’s not the Quad EQ causing the
problem.
• Have you gone a tad overboard with the EQ set-
tings? Cut is our friend, and boost should be used
wisely.
• Has the band been together long?
Noise/Hum
• Turn down each channel, one by one. If the noise
disappears, it’s coming from whatever is plugged
into that channel. Check your whatever.
• Check the signal cables between the mixer and the
Quad EQ. Disconnect them one by one. If the noise
goes away, you’ll know which input is causing the
problem.
• Sometimes it helps to plug all the audio equipment
into the same AC circuit so they share a common
ground.
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