Sep. 2001 fig.LCD22 11. INPUT A/D fig.13noise-e DSP A/D INPUT Input a short wave, and observe the output waveform using an oscilloscope. Note: Check both L(MONO) and R. D/A OUTPUT (Connect noise meter) Also, when the OUTPUT jack is used for a single channel, the L and R signals will be internally mixed, therefore, empty plugs must be inserted in the R channel for L(MONO) channel measurement and in the L(MONO) channel for R channel measurement, respectively. To proceed to the next inspection, press the [EXIT] button. 14. Noise (EXT) INPUT : Rectangular Waveform, 400 Hz, 40 mVp-p OUTPUT Level Control : MAX fig.LCD25 Oscilloscope : 1.0 V/DIV, 0.5 ms/DIV fig.5 Note: Check both L(MONO) and R.
Also, when the OUTPUT jack is used for a single channel, the L and R signals will be internally mixed, therefore an empty plug must be inserted in the R channel for L(MONO) channel measurement, and an empty plug must be inserted in the L(MONO) channel for R channel measurement. OUTPUT Level Control: MAX Confirm that the residual noise is -64 dBm (JIS-A) or lower. fig.14noise-e DSP A/D INPUT D/A SEND To proceed to the next inspection, press the [EXIT] button. 12. DSP Pitch interruption signal fig.LCD23 DSP A/D RETURN D/A OUTPUT (Connect noise meter) Confirm the pitch interruption signal generated from the DSP’s internal oscillation. If an error occurs, its contents will be displayed.
If no error occurs, it will automatically proceed to the next inspection. fig.LCD24 13. Noise (IN -> OUT) To proceed to the next inspection, press the [EXIT] button. Note: Check both L(MONO) and R. Also, when the OUTPUT jack is used for a single channel, the L and R signals will be internally mixed, therefore, empty plugs must be inserted in the R channel for L(MONO) channel measurement and in the L(MONO) channel for R channel measurement, respectively. OUTPUT Level Control: MAX Confirm that the residual noise is -74 dBm (JIS-A) or lower. 18