Roland JD-XA, Заметки по обслуживанию

Страница: 31 / 35

31
Jul. 2015 JD-XA
23. Residual Noise Check
This measures residual noise.
Setting of Click Sound
Before measuring the residual noise, it is necessary to set the volume of
the click sound output from the
CLICK jack to 0 .
1.
Start up in the normal mode.
2.
Press MENU .
3.
Press or to select SYSTEM , then press Enter .
4.
Hold down Shift and press or to select CLICK .
5.
Press or to select Level .
6.
Press - to set 0 .
7.
Press EXIT several times to return to the initial screen.
Measuring Residual Noise
1.
Set each knob as follows.
• MASTER Volume: Maximum
• MIXER A-OSC 1: Maximum
• MIXER A-OSC 2: Maximum
• MIXER AUX: Maximum
• FILTER Cutoff: Maximum
• AMP Level: Maximum
• AMP S (envelope): Maximum
• WHEEL 2: Center
• MIC INPUT LEVEL (rear panel): Center
• Others: Minimum
2.
Verify that residual noise at each jack is as follows. (all levels in DIN-
Audio, AVE)
• PHONES (L): -76 dBm or lower
• PHONES (R): -76 dBm or lower
• OUTPUT L/MONO (Tip): -86 dBm or lower
• OUTPUT L/MONO (Ring): -86 dBm or lower
• OUTPUT R (Tip): -86 dBm or lower
• OUTPUT R (Ring): -86 dBm or lower
• ANALOG DRY: -86 dBm or lower
• CLICK (Tip): -76 dBm or lower
• CLICK (Ring): -76 dBm or lower
* When verifying the noise of the OUTPUT L/MONO jack, connect a plug also to
the OUTPUT R jack.
24. Pop Noise Check
This verifies the pop noise when power is turned on or off.
1.
Set each knob in the same way as 23. Residual Noise Check (p. 31).
2.
Connect the headphones to the
PHONES
jack and verify that no
abnormal sound is heard when the power is tuned on or off.
* Wait three seconds or more between on and off. This is the same in the following
steps.
3.
Connect the headphones to the CLICK jack and verify that no abnormal
sound is heard when the power is tuned on or off.
4.
Connect the amp-equipped monitor speakers to the OUTPUT L/MONO
(Tip and Ring) jack, and verify that no abnormal sound is heard when the
power is tuned on or off.
5.
Connect the amp-equipped monitor speakers to the OUTPUT R (Tip and
Ring) jack, and verify that no abnormal sound is heard when the power is
turned on or off.
6.
Connect the amp-equipped monitor speaker to the ANALOG DRY jack,
and verify that no abnormal sound is heard when the power turned is on
or off.
25. Aftertouch Check
This verifies the aftertouch operation.
1.
Connect the headphones to the PHONES jack.
2.
Press the leftmost key forcefully and verify that aftertouch is operating.
* You should choose
INT: 004
for tone.
3.
Press the rightmost key forcefully and verify that aftertouch is operating.