565E
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TroubleshootingChapter 9
Troubleshooting Chart
SYMPTOM PROBABLE CAUSE
No output Check cables and connections. Are inputs driven by outputs, and
outputs driving inputs? Verify cables, source and load by patching
input and output connections together, at the unit. Check for AC power
presence. Did you connect the input cable to the KEY IN jack, instead of
the INPUT jack? Check input by plugging headphones halfway into the
KEY IN jack and listening for input signal. Check output by plugging
headphones into the output connector.
Hum or buzz in output Check input and output connector wiring (refer to page 13). Ground
loop: check related system equipment grounding. Are all system
components on the same AC ground?
Distortion Check input signal. Is it too hot, or is it already distorted? Check the
output loading. It should be above 600 ohms. Is the input of the device
following the 565E clipping? Is something else clipping?
Noise (hiss) Check input signal levels. The 565E is intended to operate at or near
“line” level (-10 dBu or greater). Make sure that the signal you are
feeding to the 565E is a line level signal, not mic level. Check gain
settings on downstream equipment. The system gain structure should
be such that the 565E operates at or near unity gain. Is the input signal
already noisy?
No expansion Did you connect the output cable to the KEY IN jack, instead of the
OUTPUT jack? Is the IN/BYPASS switch set to BYPASS? Is the IN/BYPASS
switch set to IN? Check cable connections at KEY IN and at the
output of any audio source that is being used as a trigger, or at the
input and output of any external device that is being used to process
the sidechain signal (i.e. an EQ). Check that any audio source or
external device that is connected to the KEY IN has power and is turned
on. Check that any cable that is plugged into the KEY IN is also con-
nected to an audio source or external processing device.
No LED display Is the unit plugged in, and turned on? Is the AC outlet OK?
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