9-1
Rev 2.2, 10/31/94
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 output by plugging headphones into analog
output connector (use an adapter).
Are the
HEADROOM displays operating?
Hum or buzz in output Check input and output connector wiring (refer to
Figure 3.3).
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?
Is the
HEADROOM display indicating clipping?
Check output loading. Should be above 600 ohms.
Are the power amplifier(s) clipping?
Is something else clipping?
Check input digital gain and output digital gain
settings.
Noise (hiss) Check input signal levels, and level control setting.
The
HEADROOM display should indicate signal, up to
but not including the
CLIP led.
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?
Display reads '
Er nn'
(nn is a two
digit number).
Power up error. Try turning the unit off, then on again.
Write the number down before you call us.
Display flashes '
bAt
' at turn-on. Memory backup battery death throes. You have about
two weeks to replace the battery before you lose your
programs. Contact the factory before trying to do this
yourself. (Software Rev 1.1 and later)
Unit not plugged in, but works
anyway
Call us.
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