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LIMITER OPERATION
The LIMITER protection circuitry is activated when the
maximum power rating of the SP OUT signal (1.е., 200
У .
INPUT - OUTPUT (LIMITER) RESPONSE
INPUT - THD (LIMITER) RESPONSE
dB overrange, the LIMITER activates and the output.
Frequency. 1 and MASTER volume: Max
signal is sent to SP OUT with minimal distortion. How-
ever, when the power of the input signal is greater than
s00———rrFTr——rrs
~
15 dB overrange, the LIMITER is по longer as effective
and the signal delivered to SP OUT will become dis-
torted.
Е
OUTPUT
{W)
THD (36)
INPUT LEVEL (dB)
TROUBLESHOOTING
The following table lists the main causes of abnormal operation and the corrective measures required, as well as the
protective circuit operation in each case.
Indicator display
|
Probable cause
Input signal strength is too high.
Turn the channel VOLUME control counter-
Limiter overrange protection
|
clockwise to decrease the input signal level от
(+15dB) has been exceeded,
decrease the output level connected to the
|
INPUT jacks.
i
Sound is distorted
The amplifier load is excessive.
Use a speaker system with the correct load im-
pedance. (Refer to page 8 for details.)
The heat sink temperature has
Check the amplifier ventilation conditions and
|
exceeded 100°C.
|
take appropriate measures to improve airflow
PROTECTION indicator is lit
|
around the amplifier.
and no sound comes from the
speakers.
А DC voltage of +/-2V or greater
Consult your dealer or nearest Yamaha service
was generated in the power ampli-
center.
fier's output-cireuit.
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