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.
Check input by plugging headphones halfway into the
sidechain
ack and listening for input signal.
Check output by plugging headphones into output
connector .
Do either of the output LED displays show anything?
Hum or buzz in output Check input and output connector wiring (refer to
Figure 3.1).
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?
Does the output LED
display indicate clipping? If so,
reduce setting of gain control and make up lost gain
after the 425.
Check output loading. Should be above 600 ohms.
Are the power amplifier(s) clipping?
Is something else clipping?
Noise (hiss) Check input signal levels. The 425 is intended to
operate at or near "line" level (-10 dBu or greater).
Check gain settings on downstream equipment.
The system gain structure should be such that the
601 operates at or near unity gain.
Is the input signal already noisy?
No LED display Is the unit plugged in, and turned on?
Is the AC outlet OK?
No nothing Is the unit in
BYPASS mode?
Unit not plugged in, but works
anyway
Call us.
9-1
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