21
Mar. 2008 GT-10
6. Verify that the output waveform display on the oscilloscope is what is
shown in the figure below, and that no sound is played while MUTE is
displayed on the screen.
fig.12out-out2.eps
7. Verify that the previous waveform display reappears when the plug is
reinserted into the OUTPUT R jack.
OUTPUT -10 dB/+4 dB Switching Test
1. Using the two cables with 1/4-inch phone plugs, connect the OUTPUT L
and R jacks to channel 1 and channel 2 of the oscilloscope and to the left-
channel and right-channel monitor speakers.
2. Verify that the on-screen display of -10 dB changes to +4 dB when the 1/
4-inch stereo phone plug is unplugged from the PHONES jack.
3. Verify that the output waveform display on the oscilloscope is what is
shown in the figure below, and that no waveform is displayed while
MUTE is displayed on the screen.
fig.12out-out4.eps
Upper: left channel, lower: right channel
4. Verify that the peak value for both the left and right channels is 1.55 to
1.75 V (substantially the same as before the plug was unplugged from the
PHONES jack).
5. Verify that signals are output from the monitor speakers and no noise or
other abnormal sound is heard, and that no sound is played while MUTE
is displayed on the screen.
6. Press [ ] to advance to the next test.
13. INPUT
Testing of the INPUT Circuitry
fig.13input2.eps
1. Using the two cables with 1/4-inch phone plugs, connect the OUTPUT L
and R jacks to channel 1 and channel 2 of the oscilloscope and to the left-
channel and right-channel monitor speakers.
2. Using a cable with a 1/4-inch phone plug, connect the SEND jack and the
INPUT jack.
3. Verify that the output waveform display on the oscilloscope is what is
shown in the figure below.
fig.13input.eps
Upper: left channel, lower: right channel
4. Verify that the peak value is from 0.65 to 0.80 V for the left channel and
from 0.55 to 0.65 V for the right channel.
5. Verify that signals are output from the monitor speakers and no noise or
other abnormal sound is heard.
6. Press [ ] to advance to the next test.
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