Yamaha Montage 6, Руководство по обслуживанию

Страница: 62 / 158

62
MONTAGE6/MONTAGE7
LCD display
Test items and judging conditions
12 : USB (to DEVICE) Checks whether the USB TO DEVICE terminal work properly or not.
1) Press the [ENTER] button first. “ Insert USB Memory! and Press [ENTER] ” is shown on the
LCD.
2) Insert the USB flash drive.
3) Press the [
ENTER
] button to start the test.
4) Confirm that “ OK ” is shown on the LCD.
5) When OK/NG of the test result is shown, testing is finished and the display is changed to the test
item selection screen.
6) Disconnect the USB flash drive.
13 : USB (to HOST) Checks whether the USB TO HOST terminal work properly or not.
1） Press the [ENTER] button first. “ Connect USB! and Press [ENTER] ” is shown on the LCD.
2） Connect the USB TO DEVICE terminal and USB TO HOST terminal by using the USB cable.
3） Press the [ENTER] button to start the test.
4） Confirm that “
OK ” is shown on the LCD.
5) When OK/NG of the test result is shown, testing is finished and the display is changed to the test
item selection screen.
6) Disconnect the USB cable.
14 : OUTPUT-L (-12dB)
Checks each output level and pitch from the L channel of the jacks.
1) Connect the frequency counter to the PHONES jack at L.
2) Connect the level meter to an output jack.
3) Set the [MASTER VOLUME] control to the maximum position.
4) Press the [ENTER] button to produce the 1kHz sine wave sound. “ ON ” is shown on the LCD.
5) Measure the frequency and confirm that the measured value is 1 kHz ± 0.2Hz.
6) Measure the output level and confirm that the measured values are within the specified range.
[PHONES] (33 -ohms load)
PHONES L: -6.5 dBu±2 dB
PHONES R: -60 dBu or less
[OUTPUT (Balanced)]
(600
-ohms
load)
OUTPUT L/MONO (HOT/COLD): +2.7 dBu±2 dB
OUTPUT R (HOT/COLD): -90 dBu or less
OUTPUT L/MONO (HOT/COLD): -1.7 dBu±2 dB
OUTPUT R (Unconnected)
[ASSIGNABLE OUTPUT (Balanced)]
(600
-ohms
load)
OUTPUT L (HOT/COLD): +2.7 dBu±2 dB
OUTPUT R (HOT/COLD): -90 dBu or less
Distortion rate
All output terminal L: 0.1 % or less
7) Set the [MASTER VOLUME] control to the minimum position.
8) Measure the output level and confirm that the measured values are within the specified range.
[OUTPUT (Balanced)]
(600
-ohms
load)
OUTPUT L/MONO (HOT/COLD): -73 dBu or less
9) Press the [EXIT] button, and testing is finished and the display is changed to the test item selection
screen.