TABLE
OF
CONTENTS
Page
Page
SPECIFICATIONS
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1
Component
GILG.
.
Sesetsendeesnacecasscawssecagvers
12
1.
GENERAL
DESCRIPTION
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2
Preamp.,
power
amp.,
bias
osc.
2.
BLOCK.
DIAGRAM
_
eorccssccscecscscenstecsccseeneeeees
$)
&
power
supply
boards
3.
CABINET
TOP
VIEW
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3
CONMUCtOL
Side
ceerereersesecessseseteeees
13
~
14
4,
CABINET
BACK
VIEW
covccscssescseceseeseessens
3
Component
BIGE.
Weeks
sonsaveswesdiseadens
15~
16
&.
DIGASSEMBLY
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4
11.
SCHEMATIC
DIAGRAM
csscscssssscsees
17~
18
6.
CHASSIS
TOP
VIEW
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5
12.
WIRING
DIAGRAM
)
crsesssscssescsscssseesees
19
~
20
7,
CHASSIS
BOTTOM
VIEW
.
oveesssesscseceseerseees
5
HARDWARE
NOMENCLATURE
.------+--++-+
41
8
MECHANICAL
ADJUSTMENT
..--.----.--
6~8
|
13.
EXPLODED
VIEW
|
9,
ELECTRICAL
ADJUSTMENT.
r++:
9~
10
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et
eS
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71
10.
MOUNTING
DIAGRAM
Cine
eb
ie
ee
7
SOS
switch
board
Head
deck—Top
View—
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93
CONAUCEOL
SIDS
—
coreeresecveccererccestonsencones
12
Control
chassis—Top
VIC
W—.
sceccesssasence
24
Component
Side
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12
Chassis—Top
View
—
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ere
45
Speaker
switch
board
Chassis—Bottom
View
—
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26
Conductor
Side
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12
1.
GENERAL.
DESCRIPTION
The
SONY
Model
TC-252
is
a
four-track
stereophonic
tape
recorder
which
may
be
operated
in
either
vertical
or
horizontal
position.
The
all
silicon
transistor
amplifier
circuit
is
specially
designed
for
low
noise
and
low
distortion
performance
and
represents
the
latest
techniques
from
SONY
engineers.
Outstanding
features:
Sound-on-sound
recording
—
Material
recorded
on
one
channel
may
be
re-recorded
on
the
other
channel
while
simultaneously
adding
new
material
from
an
outside
source.
The
mixed
product
appears
in
composite
recording
on
the
second
channel.
A
SOS
switch
is
provided
on
the
panel
for
this
special
technique,
which
may
be
performed
from
left
to
right
channels
or
vice-versa.
Scrape
Flutter
Filter
— —
This
is
a
roller
which
is
located
between
the
erase
head
and
the
record/playback
head.
It
prevents
the
tape
from
developing
longitudinal
vibrations
which
can
result
in
tape
squeal
or
frequency
modulated
distortion
of
the
tape
movement
across
the
heads.
Retractable
Pinch
Roller-
—
The
pinch
roller
is
automatically
retracted
when
the
recorder
is
placed
in
the
stop
mode.
This
simplifies
tape
threading
greatly
by
opening
the
tape
path.
2.
BLOCK
DIAGRAM:
AUX
IN
©
Q
E
Mic
O
:
PREAMP
$
POWER
AMP
0
SPEAKER
Q101,102
Q103~0Q109
A
O
LINE
OUT
=»
YWe—o
Z
°
“a
3
BIAS
OSC
,
>
L
Q301,302
©)
PHONE
ae
Ie
_
,
|
—O
LINE
OUT
B°
PREAMP
POWER
AMP
MIC
O—-—*
Q201,202
Q203~0Q209
O
SPEAKER
|
F
AUX
IN
MOTOR
A
\
o—*
D
B
ae
/
)
POWER
RECTIFIER
D301
+B
[b4—e
ac
Mabe
46
REC/PB
a
1
SOS
SWITCH
CONNECTOR
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