Roland SP-404SX Service Notes page 17

Sep. 2009
3. PHONES
fig.test03.eps
1.
Input a 1-kHz sine wave at -10 dBu from the signal generator to the
LINE IN L connector.
2.
Turn the VOLUME control all the way clockwise to adjust it to MAX.
3.
Verify that the output from the left (L) channel of the PHONES jack is a
sine wave at -3 dBu (±3 dB), and that no output comes from the right (R)
channel.
4.
Input a 1-kHz sine wave at -10 dBu from the signal generator to the
LINE IN R connector.
5.
Verify that the output from the right (R) channel of the PHONES jack is a
sine wave at -3 dBu (±3 dB), and that no output comes from the left (L)
channel.
6.
Press the [MIC] button to advance to the next item.
4. LINE IN/OUT
fig.test04.eps
1.
Input a 1-kHz sine wave at -10 dBu from the signal generator to LINE IN
L.
2.
Verify that the output from the LINE OUT L connector is a sine wave at -
13 dBu (±3 dB).
3.
Input a 1-kHz sine wave at -10 dBu from the signal generator to LINE IN
R.
4.
Verify that the output from the LINE OUT R connector is a sine wave at -
13 dBu (±3 dB).
5.
Increase the input signal and verify that the PEAK indicator lights up.
* The indicator lights up at about +5 dBu.
6.
Press the [MIC] button to advance to the next item.
5. MIC IN (EXTERNAL)
fig.test05.eps
1.
Connect an external microphone and input audio, and verify that the
signal is output from PHONES L and R or LINE OUT L and R.
2.
Slowly turn the MIC LEVEL control clockwise, and verify that the output
level rises.
3.
Press the [MIC] button to advance to the next item.
6. MIC IN (INTERNAL)
fig.test06.eps
1.
Turn the VOLUME control all the way clockwise to adjust it to MAX.
2.
Input audio into the internal microphone at the bottom right of the top
panel, and verify that the signal is output from PHONES L and R or LINE
OUT L and R.
3.
Press the [MIC] button to advance to the next item.
7. SW/LED
1.
Verify that the two locations near the Roland logo and BPM/VALUE
above and below the display simultaneously light up in alternating red
and blue.
2.
Verify that the 7-segment LED display lights up in sequence.
3.
Press the buttons whose LEDs light up.
The [FILTER+DRIVE] button lights up first.
Pressing the button makes it go dark, and the next button lights up.
The buttons light up in succession, moving from the upper left of the top
panel to the lower right. Pressing the [MIC] button, which is the last one,
makes the message CAn appear on the 7-segment LED display.
4.
Press the [CANCEL] button.
The message rEN appears on the 7-segment LED display.
5.
Press the [REMAIN] button.
Operation automatically advances to the next item.
8. A/D
fig.test08-1.eps
1.
Turn the [CTRL 1] control all the way clockwise, and verify that a
message like the one shown below appears on the 7-segment LED
display.
fig.test08-2.eps
2.
In the same way, turn the control all the way counterclockwise, and
verify that a dot is displayed at the lower right of the 8.
fig.test08-3.eps
3. Carry out steps 1 and 2 for the [CTRL 2] and [CTRL 3] controls in the
same way.
When the three controls have been verified to work correctly, execution
automatically advances to the next item.
9. MUTE/VOLUME/SD CARD
The message MUt appears on the 7-segment LED display, and a sine
wave is played.
1.
Press the [MIC] button.
2.
Verify that the [MIC] button lights up
3.
Press the [MIC] button.
4.
Verify that the [MIC] button goes dark
again.
The message rMV appears on the 7-segment LED display.
* When the message SD appears, again insert the SD card for Test-mode use.
5.
Eject the SD card for Test-mode use.
6.
When the message SD appears, again insert the SD card for Test-mode
use.
Operation automatically moves to the next item.
SP-404SX
goes dark and the audio is muted.
lights up and the audio is heard
17