Technics RS-B14 User Manual

RS-B14
NOTES:
Set
switches
and
controls
in
the
following
positions,
unless
otherwise
specified.
*
Make
sure
heads
are
clean
*
Tape
selector:
Normal
*
Make
sure
capstan
and
pinch
roller
are
clean
*
Input
selector:
Line
in
e
Judgeable
room
temperature
20+5°C
(68+9°F)
*
Input
level
controls:
Maximum
*
NR
switch:
OUT
*
Balance
control:
Center
Q Head azimuth Condition: Equipment:
adjustment * Playback mode • VTVM
е Normal tape mode * Oscilloscope
* Test tape (azimuth)...QZZCFM
L-CH/R-CH
output
balance
adjustment
терта
1.
Make
connections
as
shown
іп
fig.
2.
Reon
/
са
a
қаулай
ый
EA
[c
Ro
“ker
Playback mode VTVM Oscilloscope
. Playback the 8kHz signal from the test tape (QZZCFM). Fig. 2
Adjust screw (B) in fig. 3 for maximum output L-CH and R-CH levels. Ig.
When the output levels of L-CH and R-CH are not at maximum at the c Record/playback
same point adjust as follows. ee ngad
. Turn screw (B) shown in fig. 3 to find angles A and C (points where /
peak output levels for left and right channels are obtained). Then, A
locate angle B between angles A and C, i.e., point where L-CH and Screw (8)
R-CH outputs are balanced. (Refer to figs. 3 and 4.) Fig. 3
L-ch peak level R-ch peak level
1 Ж
ГА
L-CH/R-CH
phase
adjustment
LEVEL
|
4. Make connections as shown in fig. 5.
5. Playback the 8kHz signal from the test tape (QZZCFM).
Adjust screw (B) shown in fig. 3 so that pointers of the two VTVMs
swing to maximum and a lissajous waveform as illustrated in fig. 6 is
obtained on the oscilloscope.
Record/ Oscilloscope
playback head
Playback
D
mode LINE OUT
Vertical Horizontal
Fig. 6
Fig. 5 g
Ө Tape speed Condition: Equipment:
* Playback mode * Digital frequency counter
* Test tape... QZZCWAT
Tape
speed
accuracy
Record/
playback
LINE
OUT
head
.
Test
equipment
connection
is
shown
in
fig.
7.
о
.
Playback
test
tape
(QZZCWAT
3,000Н2),
and
supply
playback
signal
о
at
to
the
digital
frequency
counter.
Playpack
те
на
тТаШЕНЕ
conni
. Measure this frequency.
.
On
the
basis
of
3,000Hz,
determine
value
by
following
formula:
Fig.
7
Tape speed accuracy = TOO 100(%) where, f = measured value
. Take measurement at middle section of tape.
Standard value: «1.596
. If measured value is not within the standard value, adjust it by using the tape speed adjustment VR shown in
fig. 1.
Note: Please use non metal type screwdriver when you adjust tape speed accuracy on this unit.
Tape speed fluctuation
Make
measurements
in
same
manner
as
above
(beginning,
middle
and
end
of
tape),
and
determine
the
difference between maximum and minimum values and calculate as follows:
f,-f
Tape
speed
fluctuation
=
3.000
х100(%)
fi
=
maximum
value,
f,
=
minimum
value
Standard value: Less than 1%

Technics RS-B14 Specifications

General

Brand	Technics
Model	RS-B14
Category	Cassette Player
Language	English