Tascam DA-30 - Page 33

4. Adjustment of the D/A MSB
In the: reference recording input/output state, set the input
frequency to 1 kHz, then set the unit to the REC monitor
¢ mode (press only the REC button). So that the distortion
factor at this time will be minimum, adjust semi-fixed
resistors R126 (L-CH) and R226 (R-CH) for adjustment
of the MSB. (The 22 kHz LPF, 400 Hz HPF and 30 kHz
LPF should be IN and the sampling frequency should be
48 kHz.)
5. Playback output voltage (reference playback output)
Load the test tape TY-7551, then play back PGM No.
“1 (1 kHz, 0 dB). At this time, the LINE OUTPUT
voltage should be 2.0 + 0.5 V. The difference between
channels at this time should be within 1 dB.
6. Playback distortion factor
Load the test tape TY-7551, then play back PGM No.
"1" (1 kHz, 0 dB). At this time, the distortion factor
should be 0.007% or less.
9 7. Playback frequency characteristics
With the unit in the state described in 5, the playback
€ - . frequency characteristics should be 0 + 0.5 dB with respect
to the reference playback output when PGM No, “2”
(20 H2), No. “3” (100 Hz), No. “4 (10 Hz) and No. “5”
(20 kHz) are played back.
8. ° Playback channel separation
3 With the unit in the state described in 5, the channel
@ separation should be 90 dB or more at 1 kHz and 86 dB
bs or more at 10 kHz with respect to the reference playback
output when PGM No. “7” (1 kHz L), No. “8” (10 kHz
L), No. “9” (1 kHz R) and No. “10” (10 kHz R) are
played back on the other channel. (At this time, the 22
kHz LPF and the IEC-A filter should be IN.)
9. Playback S/N ratio
Load the test tape TY-7551, then play back PGM No.
"6" (non-signal). At this time, the S/N ratio should be 94
@ dB or more. (The 22 kHz LPF and 1EC-A filter should be
IN.)
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