Jeff Rowland Design Group 12 - Manual (Page 18)

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: Cause: Cause: Remedy: Remedy:
Front panel POWER INDICATOR LED does not
illuminate after pressing POWER/STANDBY BUTTON,
amplifier does not operate normally:
Incorrect power connections, incorrect speaker
connections, or circuit breaker must be reset.
Reset circuit breaker, review Installation and Rear
Panel Connections section of Owner’s Manual.
Abnormal Operation of the Model 12 internal
circuitry.
Contact your dealer immediately.
FRONT PANEL STANDBY/POWER button reverts to
Standby Mode during listening but can be returned
to normal operation:
Excessive sub-sonic or DC signals produced by
source components.
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).
Severe clipping of amplifier circuitry. Reduce volume slightly or use higher efficiency
loudspeakers.
AC MAINS CIRCUIT BREAKER switches OFF or will not
remain ON:
AC mains voltage too high for amplifier. Consult your dealer immediately to have the
amplifier reconfigured for the proper AC mains
voltage.
Abnormal operation of amplifier internal circuitry. Contact your dealer immediately.
50/60 Hz buzz noise in loudspeakers: Ground loop condition created between
components in system.
Use balanced system configuration if possible.
Inspect interconnect cables for poor connection or
termination.