565E
19
Troubleshooting
Chapter 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 K
EY
I
N
jack, instead of
the I
NPUT
jack? Check input by plugging headphones halfway into the
K
EY
I
N
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 K
EY
I
N
jack, instead of the
O
UTPUT
jack? Is the I
N
/B
YPASS
switch set to B
YPASS
? Is the I
N
/B
YPASS
switch set to I
N
? Check cable connections at K
EY
I
N
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 K
EY
I
N
has power and is turned
on. Check that any cable that is plugged into the K
EY
I
N
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?
