Yamaha EMX 620 Service Manual page 20

EMX620
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3-9 Protection
Apply a 10 Hz sine wave signal to the input; increase the input so that the output signal is clipped.Confirm that the protection
does not operate and that the speaker relay does not be open.
When applying a 1 Hz, 6 Vp-p (8.7 dBs) sine wave signal to the input, confirm that the protection operates within 2 seconds and
that the speaker relay is turned off. When turning off the input signal, confirm that the protection stops the operation seconds and
that the speaker relay automatically turns on within 5 seconds.
3-10 PC limiter and limiter
Apply a 1kHz -20 dBs sine wave signal to the input and then connect a 1 ohm ( +/- 5 % 100 W) resistor; confirm that the output signal
is Vp-p <= 20 V and that the signal is not rectangular.
3-11 LIMITER Indicator
When applying a 1 kHz -10.8 dBs sine wave signal to the input, the LIMITER indicator should light up.
3-12 Efficiency
When adjusting for the output of L and R to become 10 V (+2.2 dBs), confirm that the power consumption is 330 +/- 50 W.
4. Power Supply Fluctuation
There should be no operational problems when the power supply fluctuation is within +/- 10 % of the nominal voltage.ss
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