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LIMITER
OPERATION
The LIMITER protection circuitry is activated when the
maximum power rating of the SP OUT signal Oe, 200W
into 4 ohm loads) is exceeded. The LIMITER is effec-
tive to 15 dB overrange. When the signal is less than 15
dB overrange, the LIMITER
activates and the output
signal is sent to SP OUT with minimal distortion. How-
ever, when the power of the input signal is greater than
15 dB overrange, the LIMITER is no longer as effective
and the signal delivered to SP OUT will become dis-
torted.
OUTPUT
(W)
TROUBLESHOOTING
INPUT - OUTPUT (LIMITER) RESPONSE
INPUT - THD (LIMITER) RESPONSE
INPUT(-20 dB, Rs=6000) — SP OUT(4 0)
GEO: flat
CH VOLUME and MASTER volume: Max
Frequency: 1 kHz
THD
[%]
-40
-30
-20
-10
H
10
20
INPUT LEVEL (dB)
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
Remedy
Sound is distorted
Input signal strength is too high
Limiter overrange protection
(+15dB) has been exceeded
Turn the channel VOLUME control counter-
clockwise to decrease the input signal level or
decrease the output level connected to the
INPUT jacks.
The amplifier load is excessive.
Use a speaker system with the correct load
impedance. (Refer to page 8 for details.)
PROTECTION indicator is lit
and no sound comes from the
speakers
A DC voltage of +/-2V or greater
was generated in the power ampli-
fier's output circuit.
Ee
Consult your dealer or nearest Yamaha service
center.
13
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