© 2003 TDM Audio, Inc.
Graphic Equalizer Owner’s Manual
Page 14
Troubleshooting and Support
his section details various problems that you might encounter when using your equalizer,
and the possible causes and solutions. It also tells how to contact TDM when you need
service or support for your 30GE series graphic equalizer.
No Signal Output
Make sure that the unit is plugged in and that the power light on the front panel is illuminated. If
the unit is plugged in but the power light does not come on, try plugging some other piece of
equipment into the same outlet to make sure it works. If it does work, but you still don’t get the
power light with the unit plugged in, check the fuse on the rear of the unit.
WARNING: Make
sure the unit is unplugged from the power outlet before removing the fuse!
Try bypassing the unit by pressing the bypass (in/out) switch. If there is no signal output
normally, but you are getting a signal with the unit bypassed, the unit is probably
malfunctioning. Contact your vendor, or call TDM for support and/or service (see
Contacting
TDM
).
Check the signal source to make sure it is working correctly. Try plugging it into some sound
reinforcement equipment that is known to work (such as a monitor system). If you do this and
there is still no signal, the problem is that the signal source is not providing one.
If the signal source is not providing a signal to the equalizer, check the cabling between the
source and the equalizer. Try substituting another cable that is known to be good. If this fails, it’s
likely that your signal source is malfunctioning, or that there is some problem with the way the
individual components of the source are connected.
If the signal source is providing a signal to the equalizer, but you are still getting no output
signal, check to make sure that the problem is not with the power amps, speakers, or cables. The
most common cause this kind of problem is either a bad cable, or an incorrect hookup. The best
way to trace down a bad cable is to replace each cable in turn with one that is know to be good
and then check if that fixed the problem. If you cannot find the problem, contact your vendor, or
call TDM for support and/or service (see
Contacting TDM
).
Distortion
To determine the cause of the distortion, try systematically removing each piece of signal
processing equipment from the chain, one at a time. After a piece of equipment is removed from
the chain (by plugging the piece of equipment before it directly into the piece of equipment after
it), listen to the system and determine if the distortion is still present. When you remove a piece
of equipment and the distortion goes away, then it is likely that this particular piece of equipment
is the cause of the distortion. It is easy to check if the distortion is from your TDM 30GE series
equalizer: Simply bypass the unit by pressing the bypass switch. If the distortion goes away with
the unit bypassed then the distortion is probably coming from the equalizer.
If you determine that the TDM 30GE series equalizer is the source of a distortion problem, make
sure that the unit is plugged into a proper power source. Read the back panel of the unit for the
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