Yamaha n8 Service Manual page 79

2-13. Fader calibration
2-13-1. Outline
Adjusts A/D value of faders and stores measurement data to
the fl ash ROM necessary for adjustment in order to minimize
piece-to-piece variations of resistors in the fader parts.
2-13-2. Test contents
Starts fader calibration mode by transmitting MIDI command
(A0 50 00) from the personal computer to n8 or n12.
2-13-2-1. In case of n8
The topmost LED of INPUT METER lights up. Set the
faders of all the channels to the +6 (dB) position. After the
W
setup, press the [ ] (PLAY) switch.
If A/D value of a fader is widely different from the standard
A/D value, the LED of the [ON] switch corresponding to the
fader will fl ash. If there is any such fader, it is impossible to
proceed to next measurement point. The same is equally true
of the following measurements.
If the measurement is proceeded to the next measurement
point, the second LED from the top in the INPUT METER
will light up.
Set the faders of all the channels to the -7.5 (dB) position and
W
press the [ ] (PLAY) switch.
If the measurement is proceeded to the next measurement
point, the third LED from the top in the INPUT METER will
light up.
Set the faders of all the channels to the -∞ (dB) position and
W
press the [ ] (PLAY) switch.
If data are correctly obtained at all the three points, the
obtained data will be stored on the fl ash ROM and the fader
calibration will be fi nished.
2-13-2-2. In case of n12
The topmost LED of INPUT METER lights up. Set the
faders of all the channels to the +10 (dB) position. After the
W
setup, press the [ ] (PLAY) switch.
If A/D value of a fader is widely different from the standard
A/D value, the LED of the [ON] switch corresponding to the
fader will fl ash. If there is any such fader, it is impossible to
proceed to next measurement point. The same is equally true
of the following measurements.
If the measurement is proceeded to the following
measurement point, the second LED from the top in the
INPUT METER will light up.
Set the faders of all the channels to the 0 (dB) position and
W
press the [ ] (PLAY) switch.
If the measurement is proceeded to the next measurement
point, the third LED from the top in the INPUT METER will
light up.
Set the faders of all the channels to the -15 (dB) position and
W
press the [ ] (PLAY) switch.
If the measurement is proceeded to the next measurement point,
the bottommost LED in the INPUT METER will light up.
Set the faders of all the channels to the -∞ (dB) position and
W
press the [ ] (PLAY) switch.
If data are correctly obtained at all the four points, the
obtained data will be stored on the fl ash ROM and the fader
calibration will be fi nished.
Restarting the power of the n8 or n12 adjusts the A/D value
of the faders according to the data obtained in the above-
mentioned procedures.
If you want to abort measurement on the way, press the [
(STOP) switch to quit the fader calibration mode.
2-13-3. Execution of test from PC
(1) Transmits the MIDI command (A0 50 00) to execute the
test.
(2) MIDI command (A0 50 02) will be received if the test
result is OK and MIDI command (A0 50 03) will be
received if the test result is NG.
• Example of executing screen
* Refer to "3. List of test items" for details. (Page 80)
n8/n12
A
]
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