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(2) Thread a blank tape.
(3) Deliver
a
1 kHz
signal
of -10dB
(0.24V)
into
the AUX
INput jack and
record
the
signal on the blank tape.
(4) Be sure
that the reading on the distortion
meter is less than 1.5%.
AF
tape, blank
osc
jer
meter,
P.8. Amp.
AUX
distortion
1 kHz, -10dB
LINE OUT
Fig. 12-27
Distortion
measurement
setup
12-20.
Cross-talk Measurement
(between channels)
Connection:
As shown
in Fig. 12-28.
Switch Setting:
MONITOR
switch ......... TAPE
VR Setting:
AUX VOLUME.............. indicated on page 25
Procedures:
(1) Thread a blank tape.
(2) Place
the
machine
in stereo-record
mode.
(3) Deliver
a
1 kHz
signal
of +10dB
(2.5V)
into the L-CH
AUX
INput jack.
(4) Be sure
that the ratio of the L-CH LINE
OUTPUT
to the R-CH
LINE
OUTPUT
on
the VTVM
is more
than 45 dB.
Note:
Take
impedance-matching
correctly
for the
band-pass filter.
REC
Amp.
i, ©Tat6
Os
e,
P.B. Amp. 1kHz
4 the, +1008
CY =
LINE
OUT
Fig. 12-28
Cross-talk measurement setup
(between channels)
tape, blank
VTVM
12-21.
Cross-talk Measurement
(between tracks)
Connection:
As shown
in Fig. 12-29.
Switch Setting:
MONITOR
switch ......... TAPE
VR Setting:
AUX
VOLUME.............. indicated on
page 25
Procedures:
(1) Thread
a blank tape.
(2) Place
the machine
in stereo-record
mode.
(3) Deliver
a
1kHz
signal
of +10dB
(2.5V)
into the
L-CH
& R-CH
AUX
INput jacks
and
record
the
signal
on
the
blank
tape.
(4)
Playback
the tape and memorize
the L-CH
or R-CH
VTVM
reading,
and
then
take
up
the tape.
(5S) Turn the recorded tape upside down and put
it on the supply reel table.
(6) Playback the recorded portion of the tape
and
memorize
the
L-CH
or
the
R-CH
VTVM
reading.
(7) Be sure that the ratio of the
VT VM reading
obtained
in procedure
(4) to the
VIVM
reading obtained
in procedure
(6) is more
than 65 dB.
Note:
Take
impedance-matching
correctly
for
the
band-pass filter.
REC Amp.
tape, blank
VTVM
AF
Osc
AUX
1kHz, +10dB
LINE OUT
Fig. 12-29
Cross-talk measurement setup
(between
tracks)
Fig. 12-30
Recorded tape
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