May. 2008 DD-7 Test Items 4. Adjust the E.LEVEL control to the 12 o’clock position. With the control turned down counterclockwise all the way, turn it clockwise to the 12 o’clock position, and verify that the CHECK LED goes dark. At the 12 o’clock position, the LED lights up red. 1. VR Check (E.LEVEL) (p. 10) 2. VR Check (F.BACK) (p. 10) 3. VR Check (D.TIME) (p. 11) fig.DD-7-wave-3.eps_75 4. VR Check (MODE) (p. 12) 5. DA Check (EXP [Expression Pedal] Check) (p. 13) 6. DSP Through Check (INPUT B Check) (p. 14) 7. DSP Through Check (INPUT A Check) (p. 14) 8. DSP Through Check (OUTPUT A Check) (p. 15) 9. DSP Through Check (OUTPUT B Check) & CLIP Check (p. 15) 10. Residual Noise Check (p.
16) 11. Battery Operation Check (p. 16) 1. VR Check (E.LEVEL) Make the connections shown below to the INPUT and OUTPUT jacks on the DD-7, using the settings indicated. INPUT A: Input a rectangular wave at 400 Hz, 800 mVp-p. 5. Turn the E.LEVEL control clockwise all the way. Verify that while the control is being turned all the way clockwise from the 12 o’clock position, the CHECK LED stays dark. When the control has been turned clockwise all the way, the LED lights up red. INPUT B: Input a rectangular wave at 400 Hz, 800 mVp-p. OUTPUT A: Connect the oscilloscope. OUTPUT B: Connect the oscilloscope. fig.DD-7-wave-1.eps_75 1.
Verify that the E.LEVEL control is turned down counterclockwise all the way. Set the oscilloscope to 500 mV/DIV, 1 ms/DIV, and coupling: DC. The CHECK LED lights up orange. fig.DD-7-wave-1.eps_75 2. VR Check (F.BACK) Make the connections shown below to the INPUT and OUTPUT jacks on the DD-7, using the settings indicated. 2. With the E.LEVEL control turned down counterclockwise all the way, turn it clockwise to the 9 o’clock position. INPUT A: Input a rectangular wave at 400 Hz, 800 mVp-p. INPUT B: Input a rectangular wave at 400 Hz, 800 mVp-p. 3. Turning the control all the way counterclockwise again makes the CHECK LED light up red. Verify that the CHECK LED goes dark. OUTPUT A:
Connect the oscilloscope. OUTPUT B: Connect the oscilloscope. fig.DD-7-wave-2.eps_75 1. Verify that the F.BACK control is turned down counterclockwise all the way. Set the oscilloscope to 500 mV/DIV, 1 ms/DIV, and coupling: DC. The CHECK LED lights up orange. fig.DD-7-wave-1.eps_75 10