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Mar. 2011
4.
Disconnect the plug from the OUTPUT R jack and verify that the
waveform on channel 1 changes.
fig.audio-3.eps
5.
Depress the left pedal to advance to the next test item.
8. BYPASS Test (A2)
1.
Verify that A2 is shown on the 7-segment LED display.
2.
Make the following settings on the oscilloscope.
Channel 1 (OUTPUT L):
200 mV/DIV, 1.00 ms/DIV
Channel 2 (OUTPUT R): 200 mV/DIV, 1.00 ms/DIV
Coupling:
DC
3.
Input the following signals to INST IN L and R.
INST IN L: 200-Hz rectangular wave at 500 mVp-p
INST IN R: 200-Hz sine wave at 500 mVp-p
4.
Verify the waveforms on channel 1 and channel 2. Also verify that the
peak value is at 450 to 550 mVp-p.
fig.audio-4.eps
5.
Disconnect the plug from the INST IN R jack and verify that the
waveforms on channel 1 and channel 2 change. Verify that the peak value
is at 450 to 550 mVp-p.
fig.audio-5.eps
6.
Disconnect the plugs from the INST IN L and R jacks.
7.
Input the following signal to the MIC IN connector (using the DI-1).
200-Hz sine wave at 200 mVp-p
8.
Make the following settings on the DI-1.
ATT: 0 dB, Ø: NOR, GND: NOR
9.
Make the following settings on the oscilloscope.
Channel 1 (OUTPUT L):
2.00 V/DIV, 1.00 ms/DIV
Channel 2 (OUTPUT R): 2.00 V/DIV, 1.00 ms/DIV
Coupling:
DC
10. Adjust the MIC INPUT LEVEL control to the minimum setting (OFF) and
verify that no waveform is produced.
fig.audio-6.eps
11. Adjust the MIC INPUT LEVEL control to center and verify that the peak
value is at 4.5 to 5.3 Vp-p.
fig.audio-7.eps
12. Verify that the peak indicator starts to light up when the MIC INPUT
LEVEL control is near the one o'clock position.
13. Adjust the MIC INPUT LEVEL control to the maximum setting and verify
that the peak value is at 7.8 to 8.5 Vp-p.
fig.audio-8.eps
RC-30
17
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