Akai X-2000SD - Page 6

CROSS TALK (Cross talk between the tracks)
Tape direction
As shown in the figure, first record a 1,000 Hz sine wave
on track No.3 at +3 VU level. Next, remove the
1,000 Hz input signal and record under a non-input
condition.
Then, playback the tape on track No.3 and No. 1
(reversed condition of tape) through the 1,000 Hz B.P.F.
(Band Pass Filter, Sensitivity ... 1:1) and obtain a
ratio between the two from the following formula.
Eo
E2—E1
C = 20 log (dB)
C = Desired crosstalk ratio (dB)
es)
Eo = 1,000 Hz signal output level
E2 = 1,000 Hz crosstalk output level OZ}
E, = No-input signal record level EXSY
FREQUENCY RESPONSE
Audio X-2000SD
Frequency [> Line Line Fo
Oscillator IN OUT
Connect the measuring instrument as in the above
diagram, and measure the frequency response according
to following sequence :
RECORD :
1) Give a sine wave of 1,000 Hz to the Line Input of
the recorder to be tested, through an attenuator
from an audio frequency generator.
2) Set the Modé/Selector Knob to “Rec” position
and adjust the line input volume so that the VU
meter needle indicates “0” VU.
3) Under the condition described in (2), lower the
input level 15 dB by means of the attenuator.
4) Record the spot frequency in the range of 30 Hz to
25,000 Hz from the audio frequency generator.
Note: Frequency Response of the Cassette tape is
adjusted by the Bias Voltage (VRI07, VR207
semi-fixed Resistor).
PLAYBACK :
5) Set the Equalizer Switch on 7-1/2” or 3-3/4"
6) Connect a V.T.V.M. to the Line output.
7) Playback the tape previously recorded.
8) Adjust the output level to “O” dbm at 1,000 Hz as
indicated on the V.T.V.M. by the range selector of a
V.T.V.M.
9) Playback the recorded spot frequencies under the
conditions in (8) , make a memo of output level and
plot the value on a graph.