Aug.2001 DR-670 11. Pad fig.11-1e fig.14-1 14. Output | | | | | | | | | | | | | Your padding force is indicated within 0 to 100 "NG" is displayed. Rch: "SQR-", "SIN-", "MUTE" The pressed pad is shown. Lch: "SQR+", "SIN+", "MUTE Operation : When a pad name is displayed, press it. Operation : (1) [1] button 1k Hz square waves are output on L channel, but they are delayed 90 degrees on R channel. Your padding force will be shown within 0 to 100. The test starts from the left upper end [G] pad. (2) [2] button 1k Hz sine waves are output in the same phase on both L and R channels. Press the pads one after the other, and check their display values. Check the following points.
(3) [3] button Mute (1) Check the waveforms and their phases. 1. The display value increases or decreases according to your padding force. (2) Check the waveforms. The OUTPUT level of both L and R channels must be +3 dB +/- 1 dB (FLAT) when the Amplitude control is at the “MAX” position. 2. The display value reaches the limit (“100”) when you press strongly. If you press two pads simultaneously, “NG” is displayed. (3) Shake the DR-670 and make sure that no abnormal sounds are heard. You can select another test by rotating the Encoder control. * Accurate frequency of output waveforms: 1.0173k Hz fig.12-1e 12. Encoder 15. Factory Reset fig.15-1 Operation :
Press [START] button to start “Factory Reset.” 16. Normal operation check Turn on the DR-670’s power again, and press [START] button. Check the pattern playback sounds. Operation : 1. Press [START] button to start the Encoder test. Rotate the sound control and make sure that the sound level changes smoothly. 2. Check the display by rotating the Encoder control. The value must increase when you rotate the control clockwise (CW), and decrease when rotate it counterclockwise (CCW). Press [STOP] button to stop playback. Connect the headphones and check the playback sound and volume change of the pattern with the operation mentioned above. 3. Press [STOP] button to stop the Encoder test.
Place the control at the ‘MAX’ position, and measure the residual noise using a noise meter. You can select another test by rotating the Encoder control. (The noise level of both L and R channels must be -85 dBm (JIS-A).) 13. Foot Switch Increase the sound level of the playback amp, and check for sound control noise. Place the control at the ‘MAX’ position, and check for noise and howling. fig.13-1e 17. PAD test | | | | | | Press [BASS] button to select the BASS sound mode. Beat each pad by changing the force, and make sure that the base sound level changes. "ON," "OFF" or "NG" is displayed. Below indicates failure: The name and status of the operated switch are shown. • No sound is output.
Operation : The name and “ON” or “OFF” status of foot switch appear when you operate it. • Sound is too short. • Sound continues without stopping. Operate the foot switches one after the other, and check for their name and on/off status appear. • Noise is generated. If you operate two switches simultaneously, “NG” is displayed. 18. Battery operation check Unplug the AC adapter from the DR-670, and insert six dry cells into the battery box. You can select another test by rotating the Encoder control. Turn on the DR-670’s power and make sure that it operates normally. If the output voltage of the six dry cells is below 7 Vdc, the “DRY BATTERY LOW” message is displayed. 14