26
Dec.2004
10-8-4. Check the [PHONES]
waveform.
fig.outputdacheck14.eps
Amplitude: 4.9--6.1 [Vp-p]
mute off
fig.outputdacheck15.eps
mute on
10-8-5. Check the DIGITAL OUT
waveform.
fig.outputdacheck16.eps
Amplitude: 4.0--5.0 [Vp-p]
*
It is not necessary to check MUTE.
Press the [BANK] switch to proceed to the next test item.
11. AF Gain check
fig.afgaincheck1.eps
Input a square wave (200 Hz, 100 mVp-p) from the “GUITAR/BASS INPUT.”
Check the square wave that is output from “MASTER OUT L (MONO)/R.”
fig.afgaincheck2.eps
Amplitude: 1.3--1.5 [Vp-p]
Press [BANK] to proceed to the next test item.
12. IN-OUT check, Residual
Noise check
fig.inputadcheck1.eps
12-1. Check the “MASTER OUT” L
(MONO)/R waveform.
Input a sine wave (200 Hz, -10 dBm) from the “GUITAR/BASS INPUT.”
On your oscilloscope, set VOLT/DIV to 5 [V].
Check the sine wave that is output from “MASTER OUT L (MONO)/R.”
fig.inputadcheck2.eps
VOLT/DIV:5V TIME/DIV:1mS
Amplitude: 9.0--12 [Vp-p]
If distortion is visible in the waveform, the result is NG.
Remove the plug from the “GUITAR/BASS INPUT.”
fig.inputadcheck3.eps
Summary of Contents for DR-880
Page 11: ...11 DR 880...
Page 29: ...31 Dec 2004 DR 880 CIRCUIT BOARD MAIN BOARD fig b main1 eps View from components side...
Page 30: ...33 Dec 2004 DR 880 CIRCUIT BOARD MAIN BOARD fig b main2 eps View from foil side...
Page 34: ...41 Dec 2004 DR 880 CIRCUIT BOARD SW fig b sw1 eps View from components side...
Page 35: ...43 Dec 2004 DR 880 CIRCUIT BOARD SW fig b sw2 eps View from foil side...
