Yamaha MODX6 Service Manual page 43

LCD display
11 : USB (to DEVICE)
12 : USB (to HOST)
13 : OUTPUT-L (-12dB)
Checks whether the USB TO DEVICE terminal works properly or not.
1) Press the [ENTER] button first. " Insert USB Memory! " is shown on the LCD.
2) Insert the USB flash drive.
3) Confirm that "OK" is shown on the LCD.
4) When OK/NG of the test result is shown, testing is finished and the display is changed to the test
item selection screen.
5) Disconnect the USB flash drive.
Checks whether the USB TO HOST terminal works properly or not.
1） Press the [ENTER] button first. "Connect USB!" is shown on the LCD.
2） Connect the USB TO DEVICE terminal and USB TO HOST terminal by using the USB cable.
3） Confirm that "OK" is shown on the LCD.
4) When OK/NG of the test result is shown, testing is finished and the display is changed to the test
item selection screen.
5) Disconnect the USB cable.
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: -3.8 dBu±2 dB
[OUTPUT] (10k -ohms
L/MONO : +1.6 dBu±2 dB
[OUTPUT] (10k -ohms
L/MONO : -4.1 dBu±2 dB
7) Set the [MASTER VOLUME] control to the minimum position.
8) Measure the output level and confirm that the measured value is within the specified range.
[OUTPUT] (10k -ohms
L/MONO: -72.0 dBu or less
9) Press the [EXIT] button, and testing is finished and the display is changed to the test item selection
screen.
Test items and judging conditions
PHONES R: -62.0 dBu or less
load)
R : -72 dBu or less
load)
R : Unconnected
load)
MODX6/MODX7
43