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551E
552E
/
TroubleshootingChapter 8
There is no output signal.
Check input and output cables and
connections.
Determine that there really is a signal
coming from the source, and that it is
getting to the 551E/552E.
Distortion in the output signal.
Put 551E/552E into BYPASS. If problem
remains, check your signal source.
Check the level of the input signal. Is it
overdriving the 551E/552E’s input? If so,
reduce the incoming signal level. Is the
551E/552E’s clip indicator lit?
Is the incoming signal already distorted?
Listen “up stream” from the 551E/552E to
determine that you are feeding it a clean
signal.
Are you using an EQ band or bands to
apply a lot of boost? If so, you may be
running out of headroom. Fix this by
lowering the input level control, or
reducing the amount of boost.
Buzz in the output.
Check input and output connector wiring.
Check for ground loops between intercon-
nected system equipment.
Are all system components on the same
AC ground?
Noise (hiss).
Put 551E/552E into BYPASS. If problem
remains, check your signal source. Is the
input signal already noisy? Listen “up
stream” from the 551E/552E to determine
that you are feeding it a clean signal.
Check input signal levels and input level
control settings. The input signal may be
too low in level. If so, boost the incoming
signal (if possible).
Make sure that you are feeding the 551E/
552E/ a line-level signal, not a mic-level
signal.
Controls don’t seem to have any effect.
Is AC power connected to the unit? Since
the 551E/552E uses an automatic bypass
relay, it will still pass audio even when
power is turned off, though the controls
will have no effect.
Is the Active/Bypass button in the correct
position?
The 551E/552E does not power up or does not
respond properly.
Consult a qualified service technician or
the Symetrix factory.
The 551E/552E is not plugged in, but works
great anyway.
Call us. Call us now.
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