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Basic Troubleshooting
Basic Troubleshooting
A A
summary of fault conditions and their causes and remedies are listed below.
The Model 12 Mono Power Amplifier can produce high power levels that, without well-designed protection circuitry, could damage loudspeakers.
Therefore, most fault conditions will result in the Model 12 reverting into Standby Mode.
Condition:
Condition:
Front panel POWER INDICATOR LED does not
illuminate after pressing POWER/STANDBY BUTTON,
amplifier does not operate normally:
FRONT PANEL STANDBY/POWER button reverts to
Standby Mode during listening but can be returned
to normal operation:
AC MAINS CIRCUIT BREAKER switches OFF or will not
remain ON:
50/60 Hz buzz noise in loudspeakers:
Cause:
Cause:
Incorrect power connections, incorrect speaker
connections, or circuit breaker must be reset.
Abnormal Operation of the Model 12 internal
circuitry.
Excessive sub-sonic or DC signals produced by
source components.
Severe clipping of amplifier circuitry.
AC mains voltage too high for amplifier.
Abnormal operation of amplifier internal circuitry.
Ground
loop
condition
components in system.
Remedy:
Remedy:
Reset circuit breaker, review Installation and Rear
Panel Connections section of Owner's Manual.
Contact your dealer immediately.
Repair or replace source component. Identify and
correct abnormal conditions such as low frequency
rumble and/or acoustic feedback caused by
phono playback (if applicable).
Reduce volume slightly or use higher efficiency
loudspeakers.
Consult your dealer immediately to have the
amplifier reconfigured for the proper AC mains
voltage.
Contact your dealer immediately.
created
between
Use balanced system configuration if possible.
Inspect interconnect cables for poor connection or
termination.
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