Akai X-165D Service Manual

CROSSTALK (Crosstalk between the tracks)
(TAPE)
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BRA
AICS
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Tape
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Roe
- 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
= 201
C og E,_E,
(dB)
C =Desired crosstalk ratio (dB)
be = 7 3]
Eo = 1,000 Hz signal output level TOTTI
E2 = 1,000 Hz crosstalk output level reer
E, =No-input signal record level
FREQUENCY RESPONSE
Audio
Frequency F-
Oscillator
Connect the measuring instrument as shown in the above
diagram, and measure the frequency response according
to the following sequence :
RECORD :
1) Supply a sine wave of 1,000 Hz to the Line Input
of the recorder being tested, through an attenuator
from an audio frequency generator.
2) Set the Mode/Selector Lever 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 16 dB with the attenuator.
4) Record the spot frequency from the audio frequen-
cy generator in the range of 30 Hz to 25,000 Hz.
PLAYBACK :
5) Set the Equalizer Switch to 7-1/2” or 3-3/4”.
6) Connect a V.T.V.M. to the Line output.
7) Playback the previously recorded tape.
8) Adjust the output level to “O” dBm at 1,000 Hz
(indicated on the V.T.V.M. Range selector)
9) Playback the recorded spot frequencies under the
conditions in (8), make a memo of Output Level,
and plot the value on a graph.

Akai X-165D Specifications

General

Brand	Akai
Model	X-165D
Category	Tape Deck
Language	English