Roland SUPER Octave OC-3, Заметки по обслуживанию

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10
Sep.2003
The maximum values for the CONTROL Volume Check and the OCT1 LEVEL
Volume are detected simultaneously. The CONTROL Volume Check is not run
unless the OCT1 LEVEL Volume maximum is detected.
5. AF/AD Check
• Confirm that the MODE control is set to DRIVE.
• Use the oscillator to input a sine wave at 200 Hz, -25 dBm (FLAT) to
GUITAR IN or BASS IN.
• Check the waveform output with the oscilloscope from both OUTPUT
(MONO) and DIRECT OUT. Confirm that the waveform is the same as
that shown in the figure and that there is no distortion.
fig.test-AFAD_50
50mV/DIV, 1mS/DIV
• Check the waveform output with the noise meter from both OUTPUT
(MONO) and DIRECT OUT. Confirm that each waveform output is
FLAT and between -28.5 dBm and -25.5 dBm.
6. DAC, JACK Switch Check
• Confirm that the MODE control is set to OCT2. CHECK goes off.
• Use the oscillator to input a sine wave at 200 Hz, -25 dBm (FLAT) to
GUITAR IN.
• Connect plugs to both the OUTPUT (MONO) and DIRECT OUT jacks,
and check the waveform output from both jacks with the oscilloscope.
Confirm that the waveform output from DIRECT OUT is a 200 Hz
rectangular wave, the waveform output from OUTPUT (MONO) is a 200
Hz sine wave, and that the waveform is the same as that shown in the
figure.
fig.test-DA200HzD_50
50mV/DIV, 1mS/DIV
• Disconnect the plug connected to the DIRECT OUT jack.
• Confirm that the waveform output from OUTPUT (MONO) is a 200 Hz
rectangular wave, and that the waveform is the same as that shown in
the figure.
fig.test-DA200HzM_50
50mV/DIV, 1mS/DIV
• Disconnect the plug connected to the GUITAR IN jack and connect it to
BASS IN. Confirm that the waveform output from OUTPUT (MONO) is
a 400 Hz rectangular wave, and that the waveform is the same as that
shown in the figure.
fig.test-DA400HzM_50
50mV/DIV, 1mS/DIV
• Connect the plug to the DIRECT OUT jack.
Confirm that the waveform output from DIRECT OUT is a 400 Hz rectangular
wave, the waveform output from OUTPUT (MONO) is a 200 Hz sine wave,
and that the waveform is the same as that shown in the figure.
fig.test-DA400HzD_50
50mV/DIV, 1mS/DIV