Akai 1710W Service Manual

CROSS TALK (Cross talk between the tracks)
BRA ACO
£52509
$5503
xX
Tape direction pee
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
BP.F. (Band Pass Filter, Sensitivity .... 1 : 1) and obtain
a ratio between the two from the following formula.
C=20log___ Fo __(db)
E, -E,
C = Desired cross talk ratio (db)
E = 1,000 Hz signal output level P|
E,= 1,000 Hz cross talk output level
E,= Non-input signal record level RRR
FREQUENCY RESPONSE
Audio 1710W
Frequency —-4 Line Line
Oscillator Input Output
Connect the measuring instrument as in the above dia-
gram,
and
measure
the
frequency
response
in
the
follow-
ing 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 Record/Playback Knob in “Rec” position
and adjust the line input volume so that the VU
meter needle indicates “O” VU.
3) Under the condition described in (2), lower the
input level 10 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.
PLAYBACK:
5) Set the Record/Playback Knob in “Play” position.
6) Set the Equalizer Switch on 7-1/2" or 3-3/4"
position.
7) Connect a V.T.V.M. to the Line output.
8) Playback the tape previously recorded.
9) Adjust the output level to “0” dbm at 1,000 Hz as
indicated on the V.T.V.M. by the range selector of a
V.T.V.M.
10) Playback the recorded spot frequencies with the
conditions in (9); make a memo of output level and
plot the value on a graph.

Akai 1710W Specifications

General

Brand	Akai
Model	1710W
Category	Measuring Instruments
Language	English