Operating Manual -
11.TROUBLESHOOTING TIPS
11.1No Audio Output
Power switch not lit:
Line fuse is blown or power outlet is dead.
IF LINE FUSE IS BLOWN, REPLACE ONLY WITH SAME TYPE AND RATING FUSE.
Power switch is lit but thermal status LEDs are off:
Amp is in thermal protect mode. Power has been removed from the audio section until the amplifier returns to a normal temperature.
Power and Thermal Status are lit but Output Level Meters are not responding:
There is no input signal applied or input level controls are off. Note: In parallel mono mode, be sure that only one signal source is connected to the amp.
Protect LED is lit and relay clicking is heard:
Output is short circuited or load impedance is too low. Check speaker cables for shorts, increase load impedance by disconnecting some speakers.
A high frequency oscillation in the sound system is occuring when the relays close. Turn down the input level controls to verify that the amplifier alone is not causing the problem.
Be sure to use good quality shielded and balanced input cables. Do not run input cables alongside output speaker wires over long lengths (ie. through the same conduit).
Protect LED is lit, Clip LED comes on as soon as signal is applied:
DC voltage may be present on the output or an internal slow acting protection fuse may have blown. Have a qualified technician replace the fuse with the same type fuse.
11.2Distorted Sound
Output level meters indicate 0dB level (red CLIP LED on):
Amplifier is being clipped. Reduce the signal level at the signal source.
0 dB level on output meters is never reached:
Applied input signal is distorted before it gets to the amp. Check to see if a piece of equipment in the signal chain before the amp is clipping. Normally the amplifier should be operated with input levels fully CW to maximize headroom in the signal source. Also check for damaged speaker drivers that could cause distorted sound.
If distorted sound is still heard, there may be an internal problem. Call Ashly Audio service department at
11.3Hum or Buzz Noise
Be sure that the power cord’s
Use balanced input connections with a balanced audio source for best hum and buzz rejection. See sec- tion 7.1 on inputs.
Normally the ground lift strap on the input screw terminals should be left in place for best ground voltage suppression. In some cases hum or buzz noise may be induced by excessive ground current through the input ground connection. This current path may be interrupted by removing the ground lift strap. If the problem per- sists, input signal transformers providing complete ground isolation are available. See section 8.1 on Input Isola- tion Transformer.
Buzz noise can be caused by lighting dimmers or neon lights. Try moving the amplifier, wiring, or light- ing to different location to see if lighting is the source of the buzz. Input transformers may also fix the problem. See section 8.1 on Input Isolation Transformer.
12.DIMENSIONS
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