Yamaha MU128, Руководство по обслуживанию

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MU128
25
2. Testing the sound source PB (PLG100-VL, DX, etc)
Make sure that the sound source section and the
MEL OUT are functioning properly.
3. Testing the effect PB (PLG100-VH)
Make sure that the effect section and the MEL
IN/OUT are functioning properly.
Insert the plugs into the OUTPUT (L, R) terminals and
measure
the frequency , waveform and level of
each signal output. Set VOLUME and A/D INPUT
VOLUME at maximum.
Check items
When the sine wave data---1 kHz and -15 dBm---are
input into A/D INPUT (L), make sure the following
specified values are obtained for OUTPUT (L).
OUTPUT (L):
1 kHz +/- 3 Hz, 4.0 dBm +/-2 dBm (PLG100-VH),
1 kHz +/- 3 Hz, 3.2 dBm +/-2 dBm (PLG100-VL),
1 kHz +/- 3 Hz, 2.0 dBm +/-2 dBm (PLG100-VS),
1 kHz +/- 3 Hz, 0.8 dBm +/-2 dBm (PLG100-XG)
32. FACTORY SETTINGS
32 FACTORY SET
When the [ENTER] button is pressed, the individual
data
will be changed to the factory settings and you
will exit
the test mode.
When pressing the [EXIT] button, you will return to the
screen for selecting the desired test numbers without
changing the data to the factory settings.
33. EXIT
33 EXIT
When pressing the [ENTER] button, you will exit the test
mode and enter the play mode.
When pressing the [EXIT] button, you will return to the
screen for selecting the desired test numbers.
When you exit the test mode and enter the play mode,
make sure that the noise level for each of the terminals.
OUTPUT (L) : -88 dBm or less
OUTPUT (R) : -88 dBm or less
PHONES (L) : -88 dBm or less
PHONES (R) : -88 dBm or less